GRAIN-BOUNDARY MIGRATION IN CUBIC ZIRCONIA YTTRIA INDUCED BY ADDITION OF MAGNESIA AT VARYING CONCENTRATIONS

被引:14
作者
JEONG, JW
YOON, DY
LEE, JY
KIM, DY
机构
[1] KOREA ADV INST SCI & ENGN,DEPT MAT SCI & ENGN,TAEJON,SOUTH KOREA
[2] SEOUL NATL UNIV,COLL ENGN,DEPT INORGAN MAT ENGN,SEOUL 151,SOUTH KOREA
关键词
D O I
10.1111/j.1151-2916.1992.tb05485.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
When partially sintered cubic ZrO2-10 mol % Y2O3 specimens are heat-treated at 1500-degrees-C with powder mixtures of MgO and ZrO2-10YO3 at varying ratios, the grain boundaries migrate, leaving behind new solid solutions enriched with MgO but depleted Of Y2O3. With increasing MgO content in the solute source powder, the average migration velocity increases, and the MgO content increases and the Y2O3 content decreases slightly in these new solid solutions. With increasing MgO content in the solute source, the grain boundaries tend to be corrupted and faceted. Migration reversal is also observed at the corrugated boundaries. These variations of the grain boundary migration behavior with the MgO content in the solute source are consistent with the diffusional coherency strain energy as the driving force for the migration.
引用
收藏
页码:2659 / 2664
页数:6
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