Yb_2O_3-SiO_2 系焼結助剤を用いたガス圧焼結 Si_3N_4 の高温特性の Yb_2O_3/SiO_2 モル比依存性

概要

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High-temperature characteristics (especially high-temperature strength and oxidation resistance) of gas pressure sintered Si_3N_4 ceramics using Yb_2O_3-SiO_2 additives were evaluated. The high temperature characteristic of Si_3N_4 depended on the Yb_2O_3/SiO_2 molar ratio of additives. High 1500℃ bending strength of 395 MPa was obtained for sintered bodies with 10.0 mass% addition of additives with Yb_2O_3/SiO_2 molar ratio of 1.0. Also, small weight change (13.2g/m^2) during oxidation at 1300℃ for 300 h was obtained in this sintered body. This is considered to be due to the precipitation of Yb_4Si_2N_2O_7 and Yb_2Si_2O_7 phase in the grain boundary glass phase, as induced by a crystallization process.
社団法人日本セラミックス協会の論文
2005-04-01