BeO添加による液相焼結炭化ケイ素の熱伝導性 : 微構造観察による検討(<特集>セラミック材料)

概要

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The thermal conductivity of SiC ceramics sintered with BeO exhibited a higher value of 270W(mK)^<-1> at room temperature than that of the other non-oxide ceramics. We focused on the microstructure formed by addition of a small amount of BeO. TEM images revealed new micro structural data for understanding the thermal conductivity of this SiC ceramics. BeO addition in the SiC sintering formed a liquid phase, and densification of SiC ceramics was improved. A kind of very thin intergranular film existed as an amorphous state on the surfaces of almost all of the grains. During the liquid-phase sintering process, impurities of Fe, Ni, Al, V, Ti, and O were also precipitated at the triple-grain junction from the liquid phase.
社団法人日本材料学会の論文
2005-06-15