高強度窒化ケイ素多孔体を用いたアルミニウム-窒化ケイ素系複合材料の作製とその熱伝導率

概要

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Al-Si_3N_4 composites were fabrieated by infiltration of Al melt with Si contents from 0 to 22 vol% into a porous Si_3N_4 ceramic and their thermal conductivity was evaluated. A porous Si_3N_4 ceramic having a porosity of 39.5% and consisting of elongated β-Si_3N_4 grains connected at random in three dimensions was used as a substrate. The Al-Si_3N_4 composites were fabricated by infiltration of Al-Si alloys melt into the porous Si_3N_4 ceramic at 800℃ under a pressure of 90 MPa using hot isostatic pressing (HIP). Although increasing Si content significantly decreased the thermal conductivity of the Al-Si alloys, the decrease in thermal conductivity of the resulting composites was small due to increased thermal barrier conductantes of the interfaces between Al and Si_3N_4.
社団法人日本セラミックス協会の論文
2001-06-01