Showing papers in "Science and Technology of Advanced Materials in 2002"

TL;DR: In this article, the authors developed low resistance, refractory ohmic contact materials to n-type GaAs using the deposition and annealing techniques, and it was found that the growth of homo-or hetero-epitaxial intermediate semiconductor layers (ISL) on the GaAs surface was essential for the low resistance Ohmic contact formation.

TL;DR: In this paper, a quaternary phase diagram around three-phase region, which consists of niobium solid solution (Nbss), Nb3Al and Nb5Si3, is constructed.

TL;DR: In this paper, the characterization of surface oxide film, fretting fatigue, cytotoxicity, and biocompatibility are reviewed in the field of biomaterials that should contribute to the proper evaluations of biommaterials in vitro.

TL;DR: In this paper, the effects of precipitation phases on the hydrogen embrittlement (HE) sensitivity of Inconel 718 were investigated by means of tensile tests, where hydrogen was charged into the test specimens via a cathode.

TL;DR: In this paper, the structure of a joint between a Pb-Sn eutectic solder and an electroless Ni-8 mass% P was examined using transmission electron microscopy.

TL;DR: In this article, a laminated piezoelectric bimorph actuator with a graded compositional distribution of PZT and Pt was fabricated, and its deflection characteristics were evaluated.

TL;DR: In this article, the authors investigated the relationship between sintering atmosphere and temperature that result in transparent, sintered silica glass and showed that there are four forming phases for each sinting atmosphere: (1) nontransparent glass resulting from an overabundance of pores (2) crystal, such as cristobalite or β-quartz, (3) moganite, and (4) transparent glass.

TL;DR: In this article, a test equipment was designed to study thermal shock and thermal fatigue of ceramic materials subjected to fast heating (ascending) by heating one surface of it by an oxy-hydrogen flame while cooling the opposite surface.

TL;DR: In this article, the effect of electron irradiation on the crystallization and phase stability of Fe88Zr9B3 and Fe71Zr 9B20 amorphous alloys was examined.

TL;DR: In this article, the effects of the amount of NiO and the number of impregnation have been studied and a model of the evolution of each catalytic system arising from different preparation methods is proposed.

TL;DR: In this paper, the effects of attaching a cylindrical shroud to the end of a supersonic HVOF nozzle on gas and particle flows were analyzed, and it was found that the shroud significantly reduced the oxygen content in the field by protecting the supersonIC jet from ambient air entrainment.

TL;DR: In this paper, the authors report the mechanical and thermal properties of Ni-based superalloys with carbide sprayed by high velocity oxygen fuel (HVOF), and the detailed effects of sprayed material, spraying conditions, and initial powder structure on these properties.

TL;DR: In this paper, an ionic gel that undergoes autonomous swelling-deswelling oscillations without on-off switching of external stimuli, similar to heartbeat, has been reported.

TL;DR: In this article, a carbon composite was prepared by the steam activation of a mixture of a petroleum pitch and N,N-dimethylaminomethylphenylsilver (0.012 -mg/g) at 930 -°C for 15-19 min.

TL;DR: In this article, the authors used fluidized bed technology to deposit boride coatings onto non-ferrous metals and alloys, which were examined by means of optical microscopy, Vickers microhardness and X-ray diffraction.

TL;DR: In this paper, an optical loss type sensor was formed in the active composite, by embedding multiply pre-notched optical fiber in the carbon fiber reinforced plastics (CFRP) layer and breaking it at the prenotches under bending, followed by lamination on aluminum plate with adhesive.

TL;DR: In this article, electrophoretic deposition was performed under constant voltage conditions with varying deposition times, to infiltrate the dispersed powder suspensions into mullite fibre preforms, enabling the parameters necessary for good deposition of stoichiometric mullite to be established.

TL;DR: In this article, the concept of pseudo-in situ composites is introduced into artificial composites for ultra-high temperature applications, composed of five phases, Mo, Mo 3Si, Mo 5Si3, Mo5SiB2 and SiO2.

TL;DR: In this paper, Nb/Nb-aluminide laminate composites were manufactured with pure Nb and Al sheets, which consist of fine Nb or Nb 2Al/Al 3 or nb 3 Al/Al 4 layer structure.

TL;DR: In this article, the fracture toughness of arc-melted and directionally solidified Mo?ZrC eutectic composites were investigated. And the authors found that the growth direction of Mo solid solution (MoSS) in FZC is preferentially 100, while that of SMC is scattered.

TL;DR: In this paper, the effect of microstructure on the ferromagnetic shape memory effect in Fe-Pd alloys was examined focusing on the orientation distribution, the grain boundary character and the grain size.

TL;DR: In this article, thermal plasma physical vapor deposition has been applied successfully to the deposition of SiC films on Si substrates, with the control of processing parameters such as substrate temperature, powder feeding rate and composition of plasma gases.

TL;DR: In this article, Tikhonov's method of non-linear regularization was used to derive the relaxation times spectra h ( τ ) using the nlreg computer program.

TL;DR: In this paper, the photoluminescence (PL) characteristics are closely dependent on the contents of Ge and its oxides in SiO2 matrix, and the dependence observed strongly suggests that the PL peak at 394 nm is related to the existence of GeO and 580 nm to that of Ge nanocrystal (nc-Ge) in the films.

TL;DR: In this article, the authors showed that Fe-29.6 at.% Pd alloy ribbons prepared by the rapid solidification, melt-spinning method, showed a giant magnetostriction of 830 microstrain when an external magnetic field of 7 kOe was applied nearly normal to the ribbon surface at room temperature.

TL;DR: In this paper, the effect of grain boundary character on the martensitic transformation behavior was investigated for two types of Fe-32 at.%Ni bicrystals containing a 90°211 tilt or a 90¼¼ twist grain boundary.

TL;DR: In this article, cyclic polarization measurements made on steel, iron oxalate-coated steel and polyaniline in a high pH solution and in the absence of chloride ions showed no tendency of the surface towards pitting corrosion.

TL;DR: In this paper, Synthesized hydroxyapatite (HAp)/α-tricalcium phosphate (α-TCP) composites were prepared by colloidal process.

TL;DR: The final characterisation of continuous-reinforcement MMC squeeze casting technology allows to assess the soundness of the technology as well as the effectiveness of the precautions implemented to optimise its adoption.

TL;DR: In this paper, a eutectic powder of Al2O3 and GdAlO3 was melted using a Mo crucible by induction heating, and the melt was slowly solidified, resulting in a coarse Al2 O3 and gdAl O3 phases.