粗大粒子配向がβ型原料を出発とする自己複合化窒化ケイ素の熱伝導率に及ぼす影響

概要

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Thermal conductivity of sintered silicon nitride has been improved by the alignment of large β-Si_3N_4 grains. Beta-Si_3N_4 containing 0.5 mol% Y_2O_3 and 0.5 mol% Nd_2O_3 was seeded with rodlike β-Si_3N_4 grains and tape-cast to align the seed grains. In-situ composite microstructure of the aligned large grains in smaller matrix grains was developed by the grain growth of seed grains during gas-pressure sintering at 2200℃ for 4h. Room temperature thermal conductivity was anisotropic: 137 W・m^<-1>・K^<-1> in the direction of tape casting, 97 W・m^<-1>・K^<-1> of seet width, and 72 W・m^<-1>・K^<-1> in the direction of seet stack. The thermal conductivity in the direction parallel to the tape-casting direction was high because of the aligned large grains.
社団法人日本セラミックス協会の論文
1996-12-01