SiCウイスカー/Si_3N_4セラミック複合材料の機械特性に及ぼす焼結条件の影響

概要

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The influence of sintering temperature and time on mechanical properties was studied for a 20 wt% SiC whisker/Si_3N_4 composite. a to β phase transformation of Si_3N_4 was retarded by the whisker incorporation compared to monolithic Si_3N_4, but the delay became smaller with increasing sintering temperature. The bending strength and the fracture toughness increased with increasing sintering temperature from 1700° to 1900℃ when sintered for 30 min. On the other hand, when the sintering time was extended from 30 min to 90 min at 1800℃, both the bending strength and the toughness decreased significantly. The behavior of the composite properties can be explained on the basis of the contribution of the matrix microstructure including the content and the size of elongated β grain and the bonding strength between the Si_3N_4 grains and SiC whiskers.
社団法人日本セラミックス協会の論文
1992-04-01