窒化ケイ素-炭化ケイ素ナノ複合材料の相転移, 微細組織及び機械的特性に対する焼結助剤の役割

概要

論文の詳細を見る
Details of α→β Si_3N_4 phase transformation, microstructural development and mechanical properties of SiC reinforced-Si_3N_4 matrix nanocomposites were investigated. Two sintering aid systems were used: 7.5 mass% MgAl_2O_4 + 7.5 mass% ZrO_2(MA-Z)and 10 mass% Y_2O_3 + 4 mass% Al_2O_3(Y-A). The MA-Z system enhanced α→β phase transformation at low temperatures(1400-1550℃), which was interpreted to arise from nucleation of β-Si_3N_4 upon the SiC addition. This phenomenon was not observed in composites added with the Y-A system. Due to a large number of β-Si_3N_4 nuclei, microstructure of Si_3N_4/SiC nanocomposites added with the MA-Z system exhibited a reduced grain growth and high flexural strength.
社団法人日本セラミックス協会の論文
2001-11-01