定速昇温による焼結速度論 : イットリア安定化立方晶ジルコニア粉末の初期焼結に及ぼすアルミナ効果

松井 光二, 田中 賢治, 榎本 尚也, 北條 純一

doi:10.2109/jcersj.114.763

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タイトル別名

Sintering Kinetics at Constant Rates of Heating: Effect of Alumina on the Initial Sintering Stage of Yttria-Stabilized Cubic Zirconia Powder

公開日: 2006

DOI

10.2109/jcersj.114.763

公開者: 公益社団法人日本セラミックス協会

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説明

The sintering behavior of 7.8 mol% Yttria-stabilized cubic stabilized zirconia (Y-CSZ) powders was investigated, with emphasis on the effect of Al₂O₃ addition at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact with 0.25 mass% Al₂O₃ enhanced the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact with Al₂O₃ was lower than that of powder compact without Al₂O₃. The diffusion mechanisms at the initial sintering stage were determined by the new analytical method applied to the CRH data. This analysis exhibited that the diffusion mechanism changed from grain boundary to volume diffusions (VD) by Al₂O₃ addition. It is therefore concluded that the Al₂O₃ addition enhances the densification rate because of decreasing the activation energy of VD at the initial sintering stage.<br>

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Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)

Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 114 (1333), 763-768, 2006

公益社団法人日本セラミックス協会

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