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Sintering of attrition-milled TiN powders using a spark plasma sintering technique
KwangBoShim,KyoungHunKim,JaeHongChae,JongHanWon 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Poorly sinterable TiN powders have been fully densified using a spark plasma sintering (SPS) technique. Sintering characteristics and microstructural evolution during SPS processing were evaluated using electron microscopy. It was found that Al2O3 incorporated as a contaminant during the milling process reacted with TiN particles at temperatures above 1700oC to form a secondary phase containing Al2O3 that accelerated the mass transport. This secondary phase makes it possible to start sintering at a lower temperature. It also enables the growth of TiN grains to be controlled. This phenomenon could be confirmed by the presence of the round or curved grain boundaries and the presence of Al2O3 containing secondary phase clusters in grain boundary triple junctions.
The Carbonization Behaviors of Coal Tar Pitch for Mechanical Seal
Jae-Hong Chae,Kyung-Ja Kim,Kwang-Youn Cho,Jae-Young Choi 한국탄소학회 2001 Carbon Letters Vol.2 No.3
Quinoline insoluble formed by the heat treatment was hot-pressed near its softening point. The green body was stabilized in the temperature range of 300~400℃ and subsequently carbonized below 1300℃ in an argon atmosphere. The behaviors of QI formation was examined with varying the heat treatment temperature and the lapse of time of the sample carbonized at various temperatures. And the mechanical property, corrosion resistance, and friction behavior were also measured optimum content of mesophase pitch ensured a dense structure and high LC(002) value, which resulted in high mechanical properties, good corrosion resistance, and low-stable friction behavior.