Yb_4Si_2O_7N_2を粒界相とする窒化ケイ素の高温機械特性に及ぼすAl_2O_3の影響

概要

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Effect of Al_2O_3 on high temperature strength of silicon nitride with Yb_4Si_2O_7N_2 was investigated. A silicon nitride was fabricated by not-pressing powder mixture including 87.4 mass% Si_3N_4, 12.1 mass% Yb_2O_3 and 0.5 mass% Al_2O_3・For reference, silicon nitride without Al_2O_3 addition was fabricated from powder mixture including 0.5 mass% SiO_2 instead of Al_2O_3・Sinterability of silicon nitride with Al_2O_3 was higher than that of silicon nitride without Al_2O_3・Room temperature strength of the materials with Al_2O_3 was higher than that of the materials without Al_2O_3・Average strength at 1200 and 1350℃ of both materials were almost same. The strength at 1500℃ of the material with Al_2O_3 was slightly lower than that of the material without Al_2O_3・Creep resistance of the material with Al_2O_3 was lower than that of the materials without Al_2O_3.
社団法人日本セラミックス協会の論文
1997-09-01