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Digitale Medien

Influence of Interaction between Neighboring Oxygen Ions on Phase Stability in Cubic Zirconia (2002)

Kuwabara, Akihide ; Katamura, Junji ; Ikuhara, Yuichi ; [weitere]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 85 (2002), S. 0

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ISSN: 1551-2916

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau , Physik

Notizen: The electronic structures of undoped c- and t-ZrO2 were calculated by a first-principles molecular orbital method. A preliminary analysis revealed that experimental energy-loss near-edge structure profiles obtained in ZrO2–8 mol% Y2O3 could be satisfactorily explained from the present theoretical calculation. The calculation suggests that the stability of t-ZrO2 could be described by the interaction between neighboring oxygen ions rather than the covalency of Zr—O bonds. The effect of dopant cations on the stability of cubic-zirconia solid solutions can be estimated semiquantitatively in terms of the repulsive Coulomb force between neighboring oxygen ions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00495.x

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Digitale Medien

Self-Lubrication of Chlorine-Implanted Titanium Nitride Coating (2002)

Aizawa, Tatsuhiko ; Akhadejdamrong, Thananan ; Iwamoto, Chihiro ; [weitere]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 85 (2002), S. 0

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ISSN: 1551-2916

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau , Physik

Notizen: Chlorine implantation into TiN coatings decreases the wear loss and the friction coefficient. Even by low-dose chlorine implantation, the wear volume is decreased by three orders of magnitude or more, and the friction coefficient becomes 〈0.1. This self-lubrication mechanism is related to the presence and mobility of implanted chlorine atoms inside the columnar TiN microstructure. According to observations of chlorine-implanted TiN coatings using high-resolution transmission electron microscopy, the chlorine atoms are present in the damaged region, where TiN is composed of nanosized grains. From these data, a self-lubrication mechanism is proposed with chlorine catalyzing the oxidation of titanium and leading to the formation of some tribological reaction product.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00032.x

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Digitale Medien

Microstructural Analysis of Liquid-Phase-Sintered β-Silicon Carbide (2002)

Zhan, Guo-Dong ; Ikuhara, Yuichi ; Mitomo, Mamoru ; [weitere]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 85 (2002), S. 0

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ISSN: 1551-2916

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau , Physik

Notizen: The microstructures of fine-grained β-SiC materials with α-SiC seeds annealed either with or without uniaxial pressure at 1900°C for 4 h in an argon atmosphere were investigated using analytical electron microscopy and high-resolution electron microscopy (HREM). An applied annealing pressure can greatly retard phase transformation and grain growth. The material annealed with pressure consisted of fine grains with β-SiC as a major phase. In contrast, the microstructure in the material annealed without pressure consisted of elongated grains with half α-SiC. Energy-dispersive X-ray analysis showed no differences in the amount of segregation of aluminum and oxygen atoms at grain boundaries, but did show a significant difference in the segregation of yttrium atoms at grain boundaries along SiC grains for the two materials. The increased segregation of yttrium ions at grain boundaries caused by the applied pressure might be the reason for the retarded phase transformation and grain growth. HREM showed a thin secondary phase of 1 nm at the grain boundary interface for both materials. The development of a composite grain consisting of a mixture of β/α polytypes during annealing was a feature common to both materials. The possible mechanisms for grain growth and phase transformation are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00107.x

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Digitale Medien

Current-Voltage Characteristics across (0001) Twist Boundaries in Zinc Oxide Bicrystals (2002)

Sato, Yukio ; Oba, Fumiyasu ; Yamamoto, Takahisa ; [weitere]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 85 (2002), S. 0

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ISSN: 1551-2916

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau , Physik

Notizen: Current-voltage (I–V) characteristics across (0001) twist boundaries with various misorientation angles were investigated in undoped ZnO bicrystals fabricated by a hot-joining technique. It was confirmed by high-resolution transmission electron microscopy that the boundaries were perfectly joined without intergranular phase. None of the bicrystals prepared in this study exhibited nonlinear I–V characteristics irrespective of coherency at the boundaries. Therefore, grain-boundary atomic configuration had no relation to the formation of double Schottky barriers at the (0001) twist boundaries in ZnO.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00424.x

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