合成ジルコンとアルミナのin Situreactionを利用したムライト-ジルコニア-アルミナ系複合焼結体の徴構造変化と高温強度特性

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rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002290460/Ceramic composite was synthesized using an in situ reaction between synthetic zircon and Al_2O_3. High temperature strength did not decrease up to 1500℃ for the sample having only mullite for matrix. While, the strength decreased above 1300℃ for others. With in crease of the Al_2O_3 precipitated in the mullite matrix phase, the mullite grains became isotropic and small, which may occur the creep deformation. On the contrary, the ceramic composite used in the in situ reaction revealed excellent high temperature strength. It was found that ZrO_2 and Al_2O_3 particles dispersed in the grains of mullite matrix, contributed to increase the room temperature strength, and to improve effectively the high temperature strength. Remarkable difference of the microstructure was not observed in the composite obtained from the natural zircon instead of the synthetic zircon at same composition. However, high temperature strength decreased markedly due to the in crease of impurity content in the natural zircon. High temperature strength of the ceramic composite obtained from synthetic mullite, ZrO_2 and Al_2O_3 powders by the mixing method, decreased significantly at 1300℃. This behavior can be explained by the shape and size of the mullite in matrix, or the quantities of ZrO_2 and Al_2O_3 precipitated at the grain boundary.
社団法人日本セラミックス協会の論文
1994-01-01

合成ジルコンとアルミナのin Situreactionを利用したムライト-ジルコニア-アルミナ系複合焼結体の徴構造変化と高温強度特性

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