ホットプレスで作製したβ相窒化ケイ素ウイスカー添加サイアロン複合材料の定常クリープ速度に及ぼす粒子配向の影響

概要

論文の詳細を見る
Two kinds of compressive creep tests, in which creep-load was applied parallel and perpendicular to the hot-pressing direction, were conducted on hot-pressed β-Si_3N_4 whisker/SiALON composites at temperatures between 1275℃ and 1350℃ under 30-100 MPa. The creep rate in the former parallel test was higher than that in the latter perpendicular test at the apparent steady state creep regime. The values of β-SiAlON(101)/(201)XRD peak area ratio on the cross-sectional plane perpendicular to the creep-loading direction were 1.51 and 0.26 in the perpendicular and in the parallel testing specimens, respectively. After creep, they decreased to 1.1 and to 0.23 in the perpendicular and in the parallel tests, respectively. In addition, the microstrucrueral analysis revealed that the shape of SiAlON grains changed by the preferential grain growth through the solution/precipitation process. These results indicate that the enhancement of creep rate due to high orientation of grains is induced by increase in a rate of dissolution of grains during creep.
社団法人日本セラミックス協会の論文
1996-03-01