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Journal of the Korean Ceramic Society 1993;30(1): 62. |
상온 반복압축 후 가압소결에 의한 알루미나 분말의 소결특성 -치밀화와 결정립 성장 및 파괴인성- |
손건석, 서정, 백성기1, 김기태2 |
포항공과대학 기계공학과 1포항공과대학 재료·금속공학과 2포항공과대학 기게공학과 |
Sintering Characterization of Alumina Powders by Hot Pressing after Cold Cyclic Compaction -Densification, Grain-Growth and Fracture Toughness- |
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ABSTRACT |
Densification of alumina powder, grain size and fracture toughness of sintered body by hot pressing after cold compaction were investigated and compared to traditional hot pressing process (without cold cyclic compaction). To achieve a higher densification and to reduce the hot pressing time, hot pressing after cold cyclic compaction was more efficient compared to traditional hot pressing. This phenomenon resulted from the increment of packing densityby the acceleration fo rearrangement of powders under cold cyclic compaction. The grain size of sintered body was only dependent on relative density, and densification during hot pressing was governed by thelattice diffusion. Comprisons of grain size, densification mechanism and fracture toughness resulted from hot pressing after/without cold cyclic compaction showed that a low cyclic pressure may not effect on the fragmentation of alumina powders. |
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