GRAIN-SIZE CONTROL OF TETRAGONAL ZIRCONIA POLYCRYSTALS USING THE SPACE-CHARGE CONCEPT

被引：243

作者：

HWANG, SL

CHEN, IW

机构：

[1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 11期

关键词：

dopants; grain boundaries; grain growth; segregation; tetragonal zirconia polycrystals;

D O I：

10.1111/j.1151-2916.1990.tb06449.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Grain growth kinetics and grain‐boundary segregation of 12Ce‐TZP and 2Y‐TZP, containing divalent to pentavalent cationic dopants, were studied. In all cases, normal grain growth follwing the parabolic growth relation was observed at higher temperatures. The mobility of grain boundaries was suppressed by the addition of divalent and trivalent cations, unchanged or enhanced by the addition of tetravalent and pentavalent cations. Larger cations have a stronger effect in suppressing grain growth. From ESCA, AES, and STEM analysis of the near grain‐boundary regions, it is further concluded that only divalent and trivalent cations segregate. These observations can be satisfactorily rationalized using the space charge concept and the model of impurity drag. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：3269 / 3277

页数：9

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