Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400
第59回日本セラミックス協会進歩賞受賞に関する総説及び論文
正方晶 ZrO2 多結晶体の高温変形における TiO2 及び GeO2 添加量依存性
(論文)
吉田 英弘
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ジャーナル フリー

2006 年 114 巻 1326 号 p. 155-160

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The doping dependence of high temperature plastic flow behavior in TiO2-doped, GeO2-doped and TiO2 and GeO2 co-doped tetragonal ZrO2 polycrystal (TZP) was systematically examined at 1400°C in air under an initial strain rate of 1.3×10-4 s-1. The amount of dopant cations was in the range of 0.2-4 mol%. The flow stress in the TZP decreases with the increasing doping amount in TiO2 and/or GeO2-doped TZP, but levels off over a 3 mol% addition in the GeO2-doped and TiO2-GeO2 co-doped TZP. The doping dependence of the flow stress in the TiO2-GeO2 co-doped TZP is close to that in the GeO2-doped TZP rather than to that in the TiO2-doped TZP; the flow stress in the GeO2-doped and TiO2-GeO2 co-doped TZP is significantly lower than that in the TiO2-doped TZP. The doped cations tend to segregate in the vicinity of the grain boundaries in TZP. The doping dependence of the flow stress is probably related to the amount of the grain boundary segregation of the dopant cations; the grain boundary segregation of the dopant cations is supposed to enhance the grain boundary atomic diffusion in the TZP, and hence the flow stress consequently decreases. On the other hand, elongation to failure in the TZP is highly improved by the TiO2 and/or GeO2 doping. The improved high temperature ductility of the TZP is attributed to the flow stress reduction due to the TiO2 and/or GeO2 doping.

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© 2006 The Ceramic Society of Japan
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