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Приказ резултата 21-30 од 97
Surface characteristics and modification of different carbon materials
(Materials Science Forum, 2006)
In this work, surface characteristics of different carbon materials were investigated. The materials under consideration were: activated carbon, carbon monolith, carbon felt and glassy carbon (powder, plate and broken ...
Electrooxidation of hydrogen on nanostructured Pt/C catalysts for polymer electrolyte fuel cells
(Materials Science Forum, 2006)
Mesoporous carbon cryogel synthesized by sol-gel polycondensation and freeze-drying with specific surface area (BET) of 517 m(2) g(-1) was used as a catalyst support. Pt/C catalysts were prepared by a modified ethylene ...
Structural and dielectric properties of BaTi1-xSnxO3 ceramics
(Materials Science Forum, 2006)
BaTi1-xSnO3 (BTS) powders, with x ranging from 0 to 1, were synthesized by solid-state reaction technique. The powders were pressed into pellets and sintered at 1370 and 1420 T. The structural characterization of sintered ...
Effect of powder dispersion on the stability of silicon nitride aqueous and nonaqueous suspensions
(Materials Science Forum, 2003)
Stability of aqueous and nonaqueous silicon nitride suspensions prepared in an ultrasonic bath was compared with the stability of analogous suspensions prepared by an ultrasonic disrupter. The settling velocities of the ...
Low-energy broad-beam sputter deposition of TiNx thin films
(Materials Science Forum, 2003)
The method and parameters of TiN film deposition processes are of dominant influence on the film growth microstructure and its physical properties. One of the PVD methods is the low energy ion beam reactive sputter deposition ...
Gamma radiation effects on mechanical properties of carbon/epoxy composites
(Materials Science Forum, 2006)
Unidirectional and angle-ply carbon/epoxy laminates were gamma irradiated up to doses of 12 and 20 MGy. Composites with two different, low and high temperature epoxy matrices have been submitted to irradiation and subsequent ...
Plasma oxidation of salt bath nitrided C 15 steel samples
(Materials Science Forum, 2004)
Quenched and tempered samples made of plain carbon steel C 15 were salt bath nitrided at 580(0)C for 210 minutes and subsequently water quenched. The nitrided samples were half cut to obtain ail untreated surface that was ...
The effect of various parameters on the structure of W-Ti thin films
(Materials Science Forum, 2004)
The properties of W-Ti thin films/coatings deposited by sputtering on various substrates have been studied. Structural analyses were made by X-ray diffraction and scanning tunneling microscopy. The results have shown that ...
Effects of stacking sequence on the strength of cross-ply and quasi-isotropic carbon/epoxy laminates
(Materials Science Forum, 2004)
The effect of stacking sequence on the tensile strength of carbon/epoxy laminate was studied. The differences in effective strength values between cross plies and quasi-isotropic laminates, with the same lay-up and with ...
Synthesis, structural and luminescent properties of Gd2O3-SiO2 : Eu3+ nanopowder composites
(Materials Science Forum, 2006)
In view of the improvement of luminescent intensity in classical phosphors, different new techniques of synthesis have been developed. One of them is the sol-gel technique for nanopowder synthesis. Applied to a binary ...