STABILITY OF CUBIC ZRO2 (10 MOL-PERCENT Y2O3) WHEN ALLOYED WITH NIO, AL2O3 OR TIO2 - IMPLICATIONS TO SOLID ELECTROLYTES AND CERMETS

被引:33
作者
CHEN, SY
DENG, WH
SHEN, PY
机构
[1] Institute of Materials Science and Engineering, National Sun Yat-Sen University, Kaohsiung
来源
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 1994年 / 22卷 / 2-3期
关键词
D O I
10.1016/0921-5107(94)90252-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work uses room temperature X-ray diffraction and electron microscopy to investigate the solution of NiO, Al2O3 or TiO2, in cubic (c-) ZrO2, (with 10 mol.% Y2O3, designated as yttria fully stabilized zirconia (Y-FSZ)) powders and the consequent destabilization, if any, of Y-FSZ. After sintering at 1600 degrees C for 4 h, the dissolution of the additives (the solubilities are > 15 mol.% for TiO2, ca. 5-10 mol.% for NiO and rather limited for Al2O3) caused a smaller cell volume of c-ZrO2. Among the additives, only TiO2 causes the precipitation of tetragonal (t-) ZrO, in c-ZrO, matrix. The increased solution of TiO2 in Y-FSZ results in a larger tetragonality of t-ZrO2, but the t-ZrO2 precipitates remain as twin-related colony structure with {101} habit plane, the same as for the ZrO2-Y2O3 system. Due to oversaturation, the added NiO or Al2O3 appears as second phase particles which hindered the grain growth of c-ZrO2. The implication of these results to zirconia electrolyte cell and metal/ceramic joints such as thermal barrier coating (TBC) are discussed.
引用
收藏
页码:247 / 255
页数:9
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