MICROSTRUCTURE AND FRACTURE-TOUGHNESS OF YTTRIA-DOPED TETRAGONAL ZIRCONIA POLYCRYSTAL MULLITE COMPOSITES PREPARED BY AN INSITU METHOD

被引：21
|
作者：
OKADA, K
OTSUKA, N
BROOK, RJ
MOULSON, AJ
机构：
[1] MAX PLANCK INST MET RES, PULVERMET LAB, W-7000 STUTTGART 80, GERMANY
[2] UNIV LEEDS, SCH MAT, LEEDS LS2 9JT, W YORKSHIRE, ENGLAND
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1989年 / 72卷 / 12期
关键词：
Aspect ratio - Fracture - Yttria stabilized zirconia - Yttrium oxide - Fracture toughness - Mullite - Silicate minerals - Sintering - Polycrystals;
D O I：
10.1111/j.1151-2916.1989.tb06093.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：
Yttria-doped tetragonal zirconia polycrystal (Y-TZP)/mullite composites were prepared by three methods: in situ whisker growth (IS), physical mixing (PM) of zirconia powder and mullite whiskers, and reaction sintering (RS). Microstructures and fracture toughness values were compared. All the composites with 15 vol% of mullite could be densified to more than 97% relative density by firing at 1500° to 1550°C for 10 h. The fracture toughness of the composites as measured by the indentation method showed a clear enhancement compared with that of pure Y-TZP; the ranking was Y-TZP 2= RS composite IS composite. Enhancement of the fracture toughness in composites was found to relate strongly to the aspect ratio of mullite particles.
引用
收藏
页码：2369 / 2372
页数：4
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