- Type of paper
: Paper in journal
Title: 1. High Tc Superconductors Prepared by Rapid Quenching and
Directional Annealing
- Authors:
- Yamamoto, Tatsuya
- Stubičar, Mirko (45316)
- Chan, S.K.
- Lu, J.G.
- Prasanna, T.R.S.
- O'Handley, R.C.
Journal: Materials Science and Engineering A
Number: 1
ISSN: 0025-5416
Volume: 133
Year: 1991
Pages: from 127 to 131
Number of references: 18
Language: engleski
Summary: The transport critical current density of bulk high
Tcsuperconducting Y-Ba-Cu-O was enhanced by combining rapidquenching and
directional annealing. Pellets of Y-Ba-Cu-Oproduced by conventional ceramic
synthesis were rapidly quenchedin a twin roller (11.5 m/s). Compacted rods
of the rapidlyquenched material were partially melted and
directionallyannealed by slowly (2.5 mm/h) moving the sample through
atemperature gradient of 45 C/cm from 1020 C to 900 C. Theresulting
material is predominantly YBa2Cu3 O7(1:2:3) with a 20 %volume fraction of
Y2BaCuO5 (2:1:1) and showed strongcrystallographic texture. Transport
critical current densitieshave been measured from 1.6 10000 A/cm2 to 4.3
10000 A/cm2 in amagnetic field of 1.06 T at 77 K.
Keywords: Y-Ba-Cu-O system, YBa2Cu3 O7, Y2BaCuO5, ceramic high-Tc superconductors, rapid quenching and directional annealing processing, microstructure, transport critical current density, strong prefered crystallographic orientation of grains (texture), X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis.
- Type of paper
: Paper in journal
Title: 4. An investigation of high-energy ball-mill processing of
a Y-Ba-Cu-O high Tc superconducting ceramic system
- Authors:
- Dužević, Davor (78962)
- Stubičar, Nada (45320)
- Tudja, Marijan (50573)
Journal: Informacije MIDEM
Number: 2
ISSN: 0352-9045
Volume: 21
Year: 1991
Pages: from 104 to 109
Number of references: 23
Language: engleski
Summary: A Y2O3-BaCO3-CuO powder mixture with a mass ratio adjusted
tofullfil Y:Ba:Cu = 1:2:3 stoichiometry was treated by means of
thehigh-energy ball-mill equipment. It is slightly surprising thateven
after an enormously prolonged milling (up to 202 hours) andwith a 10 g
centrifugal acceleration of the milling balls the CuOcomponent preserves
its crystalinity, whereas yttria and bariumcarbonate undergo almost
complete amorphization already after 60 to 100 hours of milling. The papaer
gives some hints about apossible explanation of the observed selective
glassy transition.
Keywords: High temperature superconductivity, Y-Ba-Cu-O ceramics, superconducting ceramics, ball milling, technological precesses, amorphization, materials research, experimantal results, X-ray difraction, scanning electron microscopy.
- Type of paper
: Paper in journal
Title: 2. The "relativistic" electric fields produced by steady
currents:comparison with experiments
- Authors:
- Ivezić, Tomislav (71760)
Journal: Physics Letters A
Number: 12
ISSN: 0375-9601
Volume: 156
Year: 1991
Pages: from 27 to 32
Number of references: 7
Language: engleski
Summary: A comparison of the new "relativistic" electric fields
outsidestationary conductors carrying steady currents with the
availableexperiments is made. A complete agreement with these experimentsis
obtained.
Keywords: "Relativistic" electric fields, stationary conductors with steady currents, comparison with experiments.
- Type of paper
: Paper in journal
Title: 3. Electric fields from steady currents and unexplained
electromagnetic experiments
- Authors:
- Ivezić, Tomislav (71760)
Journal: Physical Review A
Number: 4
ISSN: 1050-2947
Volume: 44
Year: 91
Pages: from 2682 to 2685
Number of references: 11
Language: engleski
Summary: It is shown that the so-called "relativistic" electric
fields(T.Ivezic, Phys. Lett.A, 144(1990)427) from stationary
currentcarrying conductors are responsible for the existence oflongitudinal
forces that subject the conductor to tension. Theexploding wire phenomenon
(P.Graneau, IEEE Trans. Magn. MAG-2O,
(1984)444) is explained in terms of these longitudinal electricforces.
Other unexplained electromagnetic experiments are alsodiscussed.
Keywords: Electric fields, steady currents, longitudinal forces, exploding-wire phenomenon.
- Type of paper
: Paper in journal
Title: 5. Study of coatings from refractory carbide powders on
some steel rods prepared by using equipment with a rotating electric arc
- Authors:
- Stubičar, Mirko (45316)
- Stubičar, Nada (45320)
- Knežević, Dominik
- Lukačević, Jadranka
- Dukić, Predrag (113652)
- Dmitrović, Rada
- Šubić, Jadranko
Journal: Surface and Coatings Technology
Number: 3
ISSN: 0257-8972
Volume: 52
Year: 1992
Pages: from 275 to 279
Number of references: 2
Language: engleski
Summary: A successful attempt has been made to use recently
developedequipment, which can produce a rotating electric arc, in
thepreparation of coatings made from refractory carbide powders oncertain
types of steel. Although some weak points were observedin the applied
procedure of coating steel rods, it is stillworthwhile to continue
investigations in order to improve ourcoating technique and thus to obtain
coating materials withimproved properties in comparison with uncoated
materials. Inparticular, it should be noted that this simple method of
coatingis applicable even to items of very large dimensions.
Keywords: coatings, steel bars, refractory carbides, equipment with a rotating electric arc, microhardness, electron probe microanalysis, scanning electron microscope, light microscope, microstructure.
- Type of paper
: Paper in journal
Title: 6. Laser-induced three-modal breakdown of a tungsten
surface
- Authors:
- Lugomer, Stjepan (58170)
- Stipančić, Mladen (186940)
- Kerenović, Midhat
Journal: vacuum
Number: 57
ISSN: 0042-2070
Volume: 43
Year: 1992
Pages: from 443 to 446
Number of references: 22
Language: engleski
Keywords: Laser-material interaction, tungsten surface, Q-switched Nd:YAG laser, response zone (region), plastic deformation, superplastic deformation, hydrodynamic instability, triple grain junction site (Y-site), crack, bubble-antibubble.
- Type of paper
: Paper in journal
Title: 7. Nucleation and Growth of Ta-Oxide in a Non-stationary
Thermal Fields- I. Multi-layer Self-organized Structure
- Authors:
- Lugomer, Stjepan (58170)
- Stipančić, Mladen (186940)
- Kerenović, Midhat
Journal: vacuum
Number: 10
ISSN: 0042-2070
Volume: 43
Year: 1992
Pages: from 981 to 987
Number of references: 16
Language: engleski
Summary: The processes occuring during the laser oxidation of metals
foruses such as oxidative writing are initially discussed. This isfollowed
by a study of the oxidation of sputtered Ta-films.Oxidation in the
non-stationary thermal fields (such aslaser-driven oxidation) generates
particles which grow by thelocal isolated kinetics as the self-organized
structures. Theself-organized structure at the heating rate beta (beta
10K/min), develops into a hemispherical multi-layered structureconsisting
of spiralled discs whose radius is shrinking in thez-direction. The
particle structure was derived from the latticecharacteristics of the
successive layers, and from their spiralphase angles. Hemispherical
particles with a three-dimensionalspiral embedded are the direct
consequence of two-dimensionalhexagonal lattice commensurability and of the
spiral phasematching. Hemispherical particles with irregurarly
rippledsurfaces are the direct consequence of two-dimensional
latticeincommensurability and of the spiral phase mismatching.
Themorphology and the structure of the oxide particles, as well asthe
properties of the oxide film (formed by the fusion of theneighbouring
particles, and the fusion with the surroundingoxide) seem to depend on the
heating rate.
Keywords: Tantalum, tantalum oxide film, laser-induced oxidation, laser writing, nucleation and growth of oxide particles, self-organizing structure (SOS), hemispherical particles, multi- layered spiral structure, scanning electron microscope, Q-switched Nd:YAG laser.
- Type of paper
: Paper in journal
Title: 8. Crystal growth of lead fluoride phases using the
constant composition method- III. Effect of pH and ionic strength
- Authors:
- Stubičar, Nada (45320)
- Marković, Berislav (116951)
- Tonejc, Anton (50132)
- Stubičar, Mirko (45316)
Journal: Journal of Crystal Growth
ISSN: 0022-0248
Volume: 130
Year: 1993
Pages: from 300 to 304
Number of references: 9
Language: engleski
Summary: The kinetics of crystal growth of the lead fluoride phases
wasstudied at 25 C using the so-called constant composition method(pF-stat
method). A linear growth law was obeyed for alpha-PbF2growth from
equivalent lead nitrate and potassium fluoridesolutions with low
supersaturation and pH between 5.2 and 5.6 inpure water and in 0.1 mol/dm3
KNO3 solution. The rate is about 5times greater at high ionic strength. It
decreases linearly withchanging pH of the supersaturated solution both to
higher and tolower values than mentioned (addition of KOH and
HNO3,respectively), i.e. reaching the pH-s at which two other leadfluoride
phases grow: (a) with large excess of Pb(NO3)2 over KFand KOH to pH=5.2
phase(s) of so far unresolved structure, whichundergoes the
recrystallization in water to pure alpha-PbF2, andafter annealing to 450 C
decomposes into beta-PbF2, and anunidentified phase (probably
alpha-KnPb(n-1)F(2-n) phase with nvaried); (b) with large excess of KF over
Pb(NO3)2 and HNO3 topH=4.3, the beta-PbF2 phase was identified. The
characterizationof the grown phases was done on the basis of
polarizingmicroscopy, Fourier transform infrared (FTIR) spectra and
X-raypowder diffraction analysis.
Keywords: lead fluoride phases, alpha-PbF2, beta-PbF2, alpha-KnPb(n-1)F(2-n), kinetics of crystal growth, constant composition method (pF-stat method), light polarizing microscope, Fourrier transform i.r. spectroscopy, X-ray diffraction analysis.
- Type of paper
: Paper in journal
Title: 10. Laser-induced Rayleigh-Taylor instability frozen in a
tungsten surface-breakdown pattern
- Authors:
- Lugomer, Stjepan (58170)
- Stubičar, Mirko (45316)
Journal: vacuum
Number: 1
ISSN: 0042-2070
Volume: 45
Year: 1994
Pages: from 53 to 56
Number of references: 15
Language: engleski
Summary: Rayleigh-Taylor (R-T) instability frozen in the breakdown
patternof a W-surface, after treatment by a Q-switched Nd:YAG laser, atn= 5
kHz, v= 5 mm/s, Q 1.12 GW/cm2, was studied. The R-Tinstability was found
to appear in a form of chaoticallydistributed bubble-antibubble pairs in
the hydrodynamic responsezone, with the low density fluid layer over the
high density one.Bubble-antibubble pairs are top-rounded with
circularcross-section, showing the scale-induced bifurcation on the
smalland the large bubbles, i.e. those dominated by 2D effects, andthose
dominated by 3D ones.
Keywords: tungsten surface, laser beam treatment, Rayleigh-Taylor instability, breakdown of surface, bubble-antibubble pairs, bifurcation phenomenon, 2D and 3D effects.
- Type of paper
: Paper in journal
Title: 17. X-Ray diffraction study of W-B elemental powder
mixtures after high-energy ball-milling
- Authors:
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
- Stubičar, Nada (45320)
Journal: Fizika A
Number: 1
ISSN: 1330-0008
Volume: 4
Year: 1995
Pages: from 65 to 72
Number of references: 8
Language: engleski
Summary: Very high temperatures are needed to prepare W-B compounds.
However, the results obtained in this study demostrate a possibility of
inducing the formation of W2B, WB or WB4 tungsten borides, in air and at
room temperature, using the high-energy ball-mill treatment on appropriate
compositions of the W-B elemental powder mixtures. The present results
throw a new light on the synthesis of tungsten borides, and on the accuracy
of the equilibrium W-B phase diagram.
Keywords: W-B system, mixtures of elemental powders, synthesis of tungsten borides (W2B, WB, WB4), high-energy ball milling, X-ray diffractometry.
- Type of paper
: Paper in journal
Title: 18. Nitrogen laser beam interaction with titanium surface
- Authors:
- Henč-Bartolić, Višnja
- Kunze, Hans-J.
- Andreić, Željko
- Gracin, Davor
- Stubičar, Mirko (45316)
Number: 2
ISSN: 1330-0008
Volume: 4
Year: 1995
Pages: from 449 to 456
Number of references: 19
Language: engleski
Summary: Solid titanium target was irradiated with a N2 laser beam
of a maximal energy density of 1.1 J/cm2 per pulse and of a duration of 6
ns. The plasma, formed near the Ti surface, was analyzed by emission
spectroscopy, and the irradiated Ti surface was studied by a metallographic
microscope. The results of both investigations reveal the influence of
resonant absorption of the laser irradiation by the generated plasma. The
plasma is dense and strongly ionized, with anelectron density of 1.5 (exp
18) 1/cm3 and electron temperature of 2.7 eV. The surface heating was found
to be several times more efficient than in the cases when resonant
absorption is absent. Most of the observed surface patterns appear to be
caused by nonuniform surface heating and a very rapid cooling. The other
features are interpreted as a possible consequence of plasma-hot surface
interactions.
Keywords: effect of laser beam irradiation, N2-laser, Ti-target, emission spectroscopy, light microscopic observations, resonant absorption of irradiation by plasma.
- Type of paper
: Paper in journal
Title: 19. Study of the deamalgamation process in silver-tin-base
amalgams
- Authors:
- Dužević, Davor (78962)
- Stubičar, Mirko (45316)
- Milat, Ognjen (77950)
- Tonejc, Anton (50132)
- Trojko, Rudolf
- Stubičar, Nada (45320)
- Anić, Ivica
- Stanković, Mirko
Journal: Fizika A
Number: 3
ISSN: 1330-0008
Volume: 4
Year: 1995
Number of references: 9
Language: engleski
Summary: Deamalgamation of the common dentistry amalgam scrap, as
well as of a model Ag70-Sn17-Cu13 (weight pct) prealloy amalgam, was
studied by metallography, microhardness, X-ray diffraction and differential
thermal analysis techniques. The obtained results are discussed from the
view-point of the possible powder-metallurgical application of the process.
Keywords: deamalgamation process, dental amalgam scraps, silver-tin-base alloy, regeneration (recycling) of amalgam scrap, metallography, microhardness, X-ray diffraction, differential thermal analysis.
- Type of paper
: Paper in proceedings
Title: 24. The effects of annealing on structure and mechanical
properties of W-Cu thin films
- Authors:
- Radić, Nikola (75345)
- Stubičar, Mirko (45316)
- Editors
- Srb, Neven
Proceedings title: 4. SONT, Sv. (Part) 1
Language: engleski
Place: Zagreb
Year: 1993
ISBN/ISSN: 86-81997
Pages: from 95 to 99
Meeting: The 4th International Symposium on new Technologies (4. međunarodni simpozij o novim tehnologijama)
Held: from 10/25/93 to 10/27/93
Summary:
Pure copper, pure tungsten and Cu50W50 and Cu66W34 alloy films, afew
micrometers thick, have been deposited onto a cooled glasssubstrate by dc
magnetron cosputtering technique. Alloy filmsstructure ranged from
completely amorphous to predominantlycrystalline W(Cu) solid solution, as
determined by XRD method. Agrains size in pure metal films has been
estimated to be 35-50 Afor tungsten and approximately 120 A for cooper.
Filmmicrohardness was investigated as function of alloy compositionand
substrate polarization during deposition. The microhardnessexhibits a
maximum in phase diagram, similar to the case ofcompletely miscible binary
alloys. It was found that the enhancedion bombardment due to negative
substrate polarization increasesthe film microhardness. Annealing of the
amorphous CuW films invacuum up to 250 C temperature increases the film
microhardnessby 10-20 %, apparently due to the formation of W(Cu)
crystallinephase dispersed within a predominantly amorphous film matrix.
Keywords: Copper (Cu) - tungsten (W) system, thin films, amorphous structure, solid solution, X-ray diffraction, microhardness, crystallization of amorphous films, isochronal anneal.
Other: Publisher: Electrical Engineering Society Zagreb
- Type of paper
: Paper in proceedings
Title: 21. The influence of boron carbide (B4C) and tugsten
carbide (WC) additives on the properties of ferrotic CM
- Authors:
- Šubić, Jadranko
- Kalčić, Željko
- Jeren, Ivan (191434)
- Editors
- Srb, Neven
Proceedings title: 4. SONT, Sv. (Part) 1
Language: hrvatski
Place: Zagreb
Year: 1993
ISBN/ISSN: 86-81997
Pages: from 100 to 112
Meeting: 4. međunarodni simpozij o novim tehnologijama
Held: from 10/27/93 to 10/27/93
Summary: The influence of boron carbide (B4C) and tungsten carbide
(WC) oncoercive force, hardness and density of ferrotic type CM has
beenpresented. Ferrotic CM consists of 45 % by volume of titancarbide
(TiC) and the rest is high chrome tool steel. Theinvestigations were made
on samples of ferrotic CM , with theaddition of 2.5- 12.5 % by weight and
1-26.8 % by volume of boroncarbide or tungsten carbide to their basic
composition. Thesamples were sintered in vacuum furnaces in temperature
range of
1290-1400 C.
Keywords: ferrotic CM, high chrome tool steel-45 vol.pct. TiC, effect of B4C and WC additives, sintering of powders, microstructure,coercive force, microhardness, density.
Other: aaa
- Type of paper
: Paper in proceedings
Title: 22. Influence of high-energy ball milling and powder
origin on the microstructure of hard metal products
- Authors:
- Ledić, Milka (191423)
- Jeren, Ivan (191434)
- Stubičar, Mirko (45316)
- Editors
- Srb, Neven
Proceedings title: 4. SONT, Sv. (Part) 1
Language: hrvatski
Place: Zagreb
Year: 1993
ISBN/ISSN: 86-81997
Pages: from 113 to 118
Meeting: 4. međunarodni simpozij o novim tehnologijama
Held: from 10/25/93 to 10/27/93
Summary: The paper presents the results of the study of the
influence ofhigh-energy ball- mill processing of powders with
compositionWC-6 wt. pct. Co on the final hard metal microstructure.
Powdersfrom various sources and with the average particle size of about1 um
were used. Also, an attempt was made to explain and tocorrelate the end
microstructure of the prepared part of hardmetal with the initial
characteristics of powders and themechanothermal conditions existing during
the preparation offinal products.
Keywords: hard metal, WC- 6 wt. pct. Co, high-energy ball milling, effect of powder origin, influence of particle size distribution of powder, sintering of powder, microstructure
Other: Izdavač: Elektrotehničko društvo Zagreb
- Type of paper
: Paper in proceedings
Title: 23. Study of structure and some mechanical properties of
copper coated aluminium plates prepared by magnetron sputtering technique
- Authors:
- Stubičar, Mirko (45316)
- Milat, Ognjen (77950)
- Stubičar, Nada (45320)
- Ban Švastović, Đuro (191116)
- Šternberg, Zdenko
- Frisch, Arnulf
- Kaysser, A. Wolfgang
- Editors
- Srb, Neven
Proceedings title: 4. SONT, Sv. (Part) 1
Language: engleski
Place: Zagreb
Year: 1993
ISBN/ISSN: 86-81997
Pages: from 119 to 123
Meeting: The 4th International Symposium on new Technologies (4. međunarodni simpozij o novim tehnologijama)
Held: from 10/25/93 to 10/27/93
Summary: Light microscopic observation, microhardness measurement
and theX-ray diffraction method were applied to reveal the structure
andsome mechanical properties of copper coated aluminium platesprepared
under various conditions by using the magnetronsputtering technique. During
the coating, one side of the platewas irradiated by argon ions. The results
obtained indicate veryhigh hardness values, probably caused by the layer
formed in theregion between the plate and coating. The irradiation effect
ofargon ions was evident at lower temperatures, in contrast to thecase of
higher preparation temperature, where this effect did notappear or it was
masked by the layer formed at the interface. Thecalculated values of
residual thermal stresses are close tohardness values measured on pure Al
plate and, thus, they aresmall in comparison with other hardness values. In
spite of thiscracks going through coating, normal to the interface,
wereobserved which points to the possible presence of thermalstresses in
copper coatings.
Keywords: aluminium (Al)- copper (Cu) system, Cu-coated Al plate, deposition by magnetron sputtering technique, X-ray diffraction, microhardness, light microscopic observation, effect of substrate temperature, influence of thermal expansion.
Other: Publisher: Electrical Engineering Society Zagreb
- Type of paper
: Paper in proceedings
Title: 24. Laser-induced superplasticity on tungsten surface
- Authors:
- Lugomer, Stjepan (58170)
- Stipančić, Mladen (186940)
- Stubičar, Mirko (45316)
- Editors
- Bildstein, Hubert
- Eck, Ralf
Proceedings title: Plansee Proceedings, Vol. 4
Language: engleski
Place: Reutte, Tirol, Austria, Austria
Year: 1993
Pages: from 82 to 99
Meeting: 13th International Plansee Seminar
Held: from 05/24/93 to 05/28/93
Summary: Laser-induced superplastic behaviour was observed on
tungstensurface in multimode, multipulse treatment by Q-switched
Nd:YAGlaser. Surface treatment performed at repetition frequency n= 5kHz,
beam size of 90 um, peak power of 5 kw, and the beamvelocity v =5 mm/s has
generated fine-grain rollingsuperplasticity. The two grain-rolling
mechanisms were found tobe operative, both driven by the surface shear
waves. For thefirst mechanism the corresponding model was found to be that
ofPaidar and Takeuchi, while for the second mechanism the modelproposed by
Beere.The mechanisms are initiated by differentstress field configurations
in certain zones of the laser trace.However, both of them give superplastic
shear-rate (epsilonpoint) in the range (0.066 - 0.166) 1/s, and the
nonlineardependence of stress: epsilon point approximately equal to
sigmasquare.
Keywords: tungsten (W) surface, superplastic behaviour, lase-induced effect, mechanisms of grain rolling, surface shear waves, triple junction center (Y-site), triangular crack, superplastic creep rate.
Other: Publisher: Plansee Metall AG., Reutte, Tirol, Austria
- Type of paper
: Paper in proceedings
Title: 25. Study of high-energy ball-milling and postannealing of
B-W elemental powder mixtures
- Authors:
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
- Stubičar, Nada (45320)
- Ćorić, Kornelija
- Kosanović, Cleo (180432)
- Jeren, Ivan (191434)
Proceedings title: Powder Metallurgy World Congress (PM'94), Volume I
Language: engleski
Place: Paris, Francuska
Year: 1994
Pages: from 219 to 222
Meeting: Powder Metallurgy World Congress, PM'94
Held: from 06/06/94 to 06/09/94
Summary: The results obtained in this study indicate that it is
possible to induce the formation of BW and B4W tungsten borides in air and
at room temperature using the high-energy ball-mill treatment on an
appropriate composition of the B-W elemental powder mixtures. Formation of
borides were disturbed by appearane of B2O3 and WO3 phases, and also very
strong wear effect. To escape formation of oxides one has to use protective
atmosphere during milling and also during postanneal treatment.
Keywords: synthesis of tungsten borides (BW, B4W), high-energy ball milling, postannealing, X-ray diffraction, dilatometry, differential thermal analysis.
Other: Publisher: Les editions de physique, F-91944 Les Ulis Cedex
A, France
- Type of paper
: Paper in proceedings
Title: 26. Excimer laser alloying of TiC layer with the steel
plate
- Authors:
- Lugomer, Stjepan (58170)
- Stipančić, Mladen (186940)
- Jović, Franjo
- Stubičar, Mirko (45316)
- Liedl, Gerhard
- Editors
- Liščić, Božidar
Proceedings title: Proceedings of the Int. Conf. "Laser Material Processing"
Language: engleski
Place: Zagreb
Year: 1995
ISBN/ISSN: 953-96459-0-5
Pages: from 183 to 193
Meeting: International Conference on Laser Material Processing
Held: from 06/01/95 to 06/03/95
Summary: Laser-induced thermal convection in the Soret regime
resulted in a good alloying and increase of microhardness from 3200 to 5100
HV o.1 .
Keywords: excimer laser, thermal convection, laser alloying, TiC layer, steel plate, microhardness.
Other: Publisher: Croatian Society for Heat Treatment, I. Lučića 1,
Zagreb
- Type of paper
: Paper in proceedings
Title: An insight into the deamalgamation process in
silver-tin-base amalgams
- Authors:
- Dužević, Davor (78962)
- Stubičar, Mirko (45316)
- Milat, Ognjen (77950)
- Tonejc, Anton (50132)
- Trojko, Rudolf
- Stubičar, Nada (45320)
- Krumes, Dragomir
- Editors
- Balestrin, P.
Proceedings title: 5th SONT (5th Inter. Symp. on New Technologies)
Language: engleski
Place: Zagreb
Year: 1995
ISBN/ISSN: 953-6228-00-9
Pages: from 127 to 131
Meeting: 5th Inter. Symp. on New Technologies
Held: from 09/25/95 to 09/27/95
Summary: A number of research initiatives concerning the study of
deamalgamation phenomena in the quaternary metal Ag-Sn-Cu-Hg amalgam is
surveyed. The powder metallurgy route and research goals are emphasized.
The performance of a simple deamalgamation apparatus was tested.
Preliminary data on deamalgamation of both the dentistry amalgam scrap and
the model Ag70-Sn17-Cu13 alloy., prepared by vacuum melting, were obtained
by metallography, Vickers hardness microindentation, X-ray diffractometry
and DTA techniques. Finally, the above results are described and
interpreted.
Keywords: deamalgamation process, silver-tin-base (Ag-Sn-Cu-Hg) amalgams, regeneration cycle, recycling, X-ray diffraction, metallography, microhardness, DTA measurements.
Other: Electrotechnical Society Zagreb (EDZ), Berislavićeva 6,
Zagreb(Croatia)
- Type of paper
: Paper in proceedings
Title: A study of structural changes in some ZrO2-Y2O3-MgO powder
mixtures induced by high-energy ball-mill processing
- Authors:
- Stubičar, Mirko (45316)
- Dužević, Davor (78962)
- Stubičar, Nada (45320)
- Sondi, Ivan
- Ban Švastović, Đuro (191116)
- Kaysser, A. Wolfgang
- Editors
- Balestrin, P.
Proceedings title: Proceedings of the 5th International Symposium on New Technologies
Language: engleski
Place: Zagreb
Year: 1995
ISBN/ISSN: 953-6228-00-9
Pages: from 114 to 118
Meeting: 5th Inter. Symp. on New Technologies
Held: from 09/25/95 to 09/27/95
Summary: Influence of high-energy ball-mill processing on the
structural and morphological changes in quasi-ternary powder mixtures from
the ZrO2-Y2O3-MgO system was studied by applying X-ray diffraction and
specific surface area (BET) measurements. Extended solid solubility of MgO
and Y2O3 in cubic ZrO2, as well as a new Y2O3-WC phase are observed. WC
component was introduced into the milled system by a contamination as a
consequence of the wear effect.
Keywords: ZrO2-Y2O3-MgO system, high-energy ball-mill processing, X-ray diffraction, measurement of specific surface area of powders by BET method.
Other: Publisher: Electrotechnical Society Zagreb (EDZ),
Berislavićeva 6, Zagreb (Croatia).
- Type of paper
: Summary in proceedings
Title: 29. Study of structural changes in the course of the ball
mill processing of powdered Y-Ba-Cu-O high Tc superconducting ceramic
system
- Authors:
- Dužević, Davor (78962)
- Stubičar, Mirko (45316)
- Prester, Mladen (68441)
- Kaysser, A. Wolfgang
- Editors
- Grdenić, Drago
Proceedings title: The Thirteenth European crystallographic Meeting, Book of Abstracts
Language: engleski
Place: Ljubljana,, Slovenija
Year: 1991
Pages: from 312 to 312
Meeting: The Thirteenth European Crystallographic Meeting (13 Susret kristalografa Evrope)
Held: from 08/26/91 to 08/30/91
- Type of paper
: Summary in proceedings
Title: 30. Amorphization of zeolites A, X and synthetic mordenite
by ball milling
- Authors:
- Kosanović, Cleo (180432)
- Bronić, Josip (117985)
- Subotić, Boris (45364)
- Šmit, Ivan (47636)
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
- Editors
- Grdenić, Drago
Proceedings title: The Joint Slovenian-Croatian Crystallographic Meeting, Book of Abstracts
Language: engleski
Place: Ljubljana,, Slovenija
Year: 1992
Pages: from 43 to 43
Meeting: The Joint Slovenian-Croatian Crystallographic Meeting (Zajednički susret kristalografa Slovenije i Hrvatske)
Held: from 10/01/92 to 10/02/92
- Type of paper
: Summary in proceedings
Title: 31. Mechanical and Structural Properties of Cu-W thin
films
- Authors:
- Radić, Nikola (75345)
- Stubičar, Mirko (45316)
- Editors
- Zorc, Hrvoje
Proceedings title: 1. Susret vakuumista Hrvatske i Slovenije, Program i Sažeci
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 10 to 10
Meeting: Powder Metallurgy World Congress, PM'94
Held: from 04/21/93 to 04/21/93
- Type of paper
: Summary in proceedings
Title: 32. Mechanochemical treatment of zeolites
- Authors:
- Kosanović, Cleo (180432)
- Bronić, Josip (117985)
- Subotić, Boris (45364)
- Šmit, Ivan (47636)
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
- Editors
- Kaerger, Joerg
Proceedings title: The Fifth German Workshop on Zeolites, Program and Abstracts
Language: engleski
Place: Leipzig, Germany
Year: 1993
Pages: from 27 to 27
Meeting: The Fifth German Workshop on Zeolites
Held: from 03/14/93 to 03/16/93
- Type of paper
: Summary in proceedings
Title: 33. Laser-shock effects on refractory metals in gaseous
atmospheres
- Authors:
- Lugomer, Stjepan (58170)
- Bitelli, G.
- Stipančić, Mladen (186940)
- Stubičar, Mirko (45316)
- Editors
- Bosanac, S.D.
Proceedings title: Brioni Int. Conf. on Interdisciplinary Topics in Physics andChemistry, Abstracts
Language: engleski
Place: Zagreb
Year: 1993
Pages: from 17 to 17
Meeting: Brioni Int. Conf. on Interdisciplinary Topics in Physics and Chemistry IV
Held: from 09/13/93 to 09/17/93
- Type of paper
: Summary in proceedings
Title: 34. Laser-induced superplasticity on tungsten surface
- Authors:
- Lugomer, Stjepan (58170)
- Stipančić, Mladen (186940)
- Stubičar, Mirko (45316)
- Editors
- Bildstein, Hubert
- Eck, Ralf
Proceedings title: The 13th International Plansee Seminar, The Plansee Proceedings, Part 4
Language: engleski
Place: Reutte, Tirol, Austria, Austria
Year: 1993
Pages: from 0 to 0
Meeting: 13th International Plansee Seminar
Held: from 05/24/93 to 05/28/93
- Type of paper
: Summary in proceedings
Title: 35. Comparing of the transformation sequence gamma-AlOOH
(boehmite) to alpha-Al2 O3 (corundum) induced by heating and by ball
milling
- Authors:
- Tonejc, Anđelka (50121)
- Tonejc, Anton (50132)
- Bagović, Davor
- Kosanović, Cleo (180432)
- Stubičar, Mirko (45316)
- Subotić, Boris (45364)
- Bronić, Josip (117985)
- Editors
- Masumoto, T.
Proceedings title: The Eight Int. Conf. on Rapidly Quenched and Metastable Materials, Abstracts
Language: engleski
Place: Sendai, Japan
Year: 1993
Pages: from 176 to 176
Meeting: The Eight Int. Conf. on Rapidly Quenched and Metastable Materials
Held: from 07/22/93 to 07/27/93
- Type of paper
: Summary in proceedings
Title: X-ray diffraction study of B-W powder mixtures during
their processing by high-energy ball milling
- Authors:
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
- Stubičar, Nada (45320)
- Editors
- Kamenar, Boris
- Golič, Ljubo
Proceedings title: Book of abstracts and Programme
Language: engleski
Place: Kranjska Gora (Slovenija), Slovenija
Year: 1994
Pages: from 54 to 54
Meeting: The Joint Slovenian-Croatian Crystallographic Meeting (Zajednički susret kristalografa Slovenije i Hrvatske)
Held: from 09/29/94 to 09/30/94
- Type of paper
: Summary in proceedings
Title: A Study of deamalgamation process in dental Ag-Sn-Cu-Hg
system
- Authors:
- Dužević, Davor (78962)
- Stubičar, Mirko (45316)
- Milat, Ognjen (77950)
- Tonejc, Anton (50132)
- Trojko, Rudolf
- Editors
- Kamenar, Boris
- Golič, Ljubo
Proceedings title: Book of abstract and programme
Language: engleski
Place: Kranjska Gora (Slovenija), Slovenija
Year: 1994
Pages: from 56 to 56
Meeting: Third Slovenian-Croatian crystallographic meeting
Held: from 09/29/94 to 09/30/94
- Type of paper
: Summary in proceedings
Title: 38. Equivalence of ball milling and thermal treatment for
high-temperature induced phase transitions
- Authors:
- Tonejc, Anton (50132)
- Tonejc, Anđelka (50121)
- Stubičar, Mirko (45316)
- Editors
- Kamenar, Boris
- Golič, Ljubo
Proceedings title: Book of abstracts and programmne
Language: engleski
Place: Kranjska Gora (Slovenija), Slovenija
Year: 1994
Pages: from 60 to 60
Meeting: Third Slovenian-Croatian crystallographic meeting
Held: from 09/29/94 to 09/30/94
- Type of paper
: Summary in proceedings
Title: 39. Laser treatment of titan surface in oxygen atmosphere
- Authors:
- Bitelli, G.
- Furić, Krešimir
- Gamulin, O.
- Lugomer, Stjepan (58170)
- Maksimović, Aleksanda
- Stipančić, Mladen (186940)
- Stubičar, Mirko (45316)
- Editors
- Dulčić, Antonije
Proceedings title: Knjiga sažetaka
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 69 to 70
Meeting: Prvi znanstveni sastanak Hrvatskog fizikalnog društva
Held: from 09/28/94 to 09/30/94
- Type of paper
: Summary in proceedings
Title: 40. Microstructural investigations of new materials
- Authors:
- Bagović, Davor
- Bonefačić, Antun
- Ogorelec, Yvonimir
- Stubičar, Mirko (45316)
- Tonejc, Anđelka (50121)
- Tonejc, Anton (50132)
- Editors
- Dulčić, Antonije
Proceedings title: Knjiga sažetaka
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 77 to 78
Meeting: Prvi znanstveni sastanak Hrvatskog fizikalnog društva
Held: from 09/28/94 to 09/30/95
- Type of paper
: Summary in proceedings
Title: 41. Preparation and characterization of structures and
properties of new materials suitable for applications in advanced
technologies
- Authors:
- Ban Švastović, Đuro (191116)
- Dužević, Davor (78962)
- Jeren, Ivan (191434)
- Ledić, Milka (191423)
- Stubičar, Mirko (45316)
- Stubičar, Nada (45320)
- Editors
- Dulčić, Antonije
Proceedings title: Knjiga sažetaka
Language: hrvatski
Place: Zagreb
Year: 1994
Pages: from 79 to 80
Meeting: Prvi znanstveni sastanak Hrvatskog fizikalnog društva
Held: from 09/28/94 to 09/30/94
- Type of paper
: Summary in proceedings
Title: A study of structural changes in some ZrO2-Y2O3-MgO powder
mixtures induced by high-energy ball-mill processing
- Authors:
- Stubičar, Mirko (45316)
- Dužević, Davor (78962)
- Stubičar, Nada (45320)
- Sondi, Ivan
- Milat, Ognjen (77950)
- Kaysser, A. Wolfgang
- Editors
- Popović, Stanko
- Banić-Tomšić, Zrinka
- Vlahoviček, Kristian
Proceedings title: Book of abstracts and programme
Language: engleski
Place: Trakošćan, Hrvatska
Year: 1995
Pages: from 19 to 19
Meeting: Fourth Croatian-Slovenian Crystallographic Meeting
Held: from 09/28/95 to 09/30/95
- Type of paper
: Prototype
Title: 43. Preparation of microcrystalline alpha-Al2 O3
(corundum) via mechan ochemical treatment
- Authors:
- Kosanović, Cleo (180432)
- Subotić, Boris (45364)
- Stubičar, Mirko (45316)
- Šmit, Ivan (47636)
- Tonejc, Anton (50132)
Institution of application: Državni zavod za patente Republike Hrvatske
Date of application: 12/17/92
Registration number of application: P921440A
Countries in which it is protected: Republika Hrvatska
Language: hrvatski
Summary: The corundum (alpha-Al2 O3) is one of the most important
ceramic materials. Due to its mechanical, electrical, thermal, optical,and
the other properties this material is widely used in various engineering
fields. Moreover, because of its high hardness and low cost it can not be
avoided as abrasive material alone, or incombination with the other kind of
powders. It is evident that upto date alpha-Al2 O3 has been prepared using
various available methods, and most of them include prolonged heating
chosen of raw materials at the temperature which is at least higher than
1000 C. Thus, a great amount of energy is consuming during the corundum
preparation. The recipe which we offer in our patent allow one to be able
to prepare the microcrystalline alpha-Al2 O3 powder in the course of
processing starting with various raw materials such as: gamma-Al2 O3,
Al(OH)3, gamma-AlOOH, or other crystalline modification of oxides or
hydroxides, and then just applying the treatment consisting of one or two
steps. The former route involve only mechanochemical treatment at the room
temperature, while the latter one include firstly thermal heating of the
starting materials at temperature taken from the interval 100-500C, and
then applying the mechanochemical treatment again at the room temperature.
However, the processing time is much shorter for route (b) in comparison
with route (a).
Keywords: processing (manufacturing) of microcrystalline powder, corundum ( alpha-Al2 O3), gamma-AlOOH, Al(OH)3, gammna-Al2 O3, mechanochemical treatment, thermal treatment.
Other:
- Type of paper
: Prototype
Title: 44. Regeneration (recycling) of mercury and silver alloys
from scrap amalgams
- Authors:
- Dužević, Davor (78962)
- Stubičar, Mirko (45316)
- Stubičar, Nada (45320)
- Dužević, Nevenka
Institution of application: Državni zavod za patente Republike Hrvatske
Date of application: 08/16/94
Registration number of application: 559-03-94-01
Countries in which it is protected: Hrvatska
Language: hrvatski
Summary: The offered procedure for regenerations of silver alloys
and pure mercury from dental amalgam scraps consisted of two steps. The
first included heat-treatment of scraps in a closed system (e.g. vacuum
furnace) up to temperature chosen from an interval of (650-800)K. At this
temperature occurs decomposition of amalgam scraps, and pure mercury vapor
was liquefied and collected in a vessel placed outside the system. The rest
material (silver alloy) was removed from system, and then mechanically
grinded (filed) up to average powder particle size (50-70 um) suitable for
new application.
Keywords: regeneration (recycling) of scraps, silver-base amalgams, thermomechanical treatment.
- Type of paper
: Mentorship
Title: 51. Powder metallurgy technologies with applications to
tungsten-bor system
- Authors:
- Maltar, Darko
- Type of paper
: Mentorship
Title: 52. Preparation and characterization of some borocarbides
- Authors:
- Pavić, Dragutin
- Type of paper
: Manuscript
Title: 45. Study of structural transformation in
potasium-exchanged zeolite A induced by thermal and mechanochemical
treatments (submitted for publication)
- Authors:
- Kosanović, Cleo (180432)
- Subotić, Boris (45364)
- Šmit, Ivan (47636)
- Čižmek, Ankica (42414)
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
Language: engleski
- Type of paper
: Manuscript
Title: 46. The synthesis of the zirconia based ZrO2-Y2O3 cubic
and ZrO2-CoO tetragonal solid solutions by ball milling (submitted for
publication)
- Authors:
- Tonejc, Anton (50132)
- Stubičar, Mirko (45316)
- Tonejc, Anđelka (50121)
- Sekulić, Andreja
- Furić, Krešimir
Language: engleski
- Type of paper
: Manuscript
Title: 47. Kinetics of crystal growth of alpha-PbF2 and
micellization of non-ionic surfactant triton x-100 at steady-state
condition (submitted for publication)
- Authors:
- Stubičar, Nada (45320)
- Banić, Kristina
- Stubičar, Mirko (45316)
Language: engleski
- Type of paper
: Manuscript
Title: 48. High-power laser-metal interactions in pressurized
gaseous atmospheres (submitted for publication)
- Authors:
- Lugomer, Stjepan (58170)
- Bitelli, G.
- Stipančić, Mladen (186940)
- Stubičar, Mirko (45316)
- Furić, Krešimir
- Ivanda, M.
- Gamulin, O.
Language: engleski
- Type of paper
: Manuscript
Title: 49. Study of stability of amorphous Al-W thin films
prepared by magnetron deposition (in preparation)
- Authors:
- Radić, Nikola (75345)
- Stubičar, Mirko (45316)
- Tonejc, Anton (50132)
Language: engleski
- Type of paper
: Manuscript
Title: 50. Study of amorphization processes of some clay minerals
after high-energy ball milling (in preparation)
- Authors:
- Sondi, Ivan
- Stubičar, Mirko (45316)
- Milat, Ognjen (77950)
Language: engleski
- Type of paper
: Other
Title: 29. Technologies of powder materials with application to
the tungsten- boron system, B.Sc.thesis
- Authors:
- Maltar, Darko
Type of work: Diplomski rad, Fizički odjel, Prirodoslovno-matematički fakultet,Zagreb, 1994.
Language: hrvatski
Summary: In short way it was described different modern methods
forproduction of various materials in their powder states.Thenfollowed
description of possible methods for consolidation ofvarious types of powder
materials. Finally the above knowled-
ge was exploited in experiments using the tungsten-boron powdersystem. The
results of the performed experiments indicatethat it is possible to prepare
at the room temperature differenttypes of tungsten borides by applying the
high-energy ballmilling instead of heating the powder mixtures at high
enoughtemperatures (above 1000 C).
Keywords: methods of production of powders, consolidation methods of powders, tungsten-boron system, high-temperature synthesis of borides, milling synthesis of borides, high-energy ball milling, X-ray diffraction.
Other: Mentor: Doc. dr. Mirko Stubičar
