Toughening of nontransformable t′-YSZ by addition of titania

被引:111
作者
Schaedler, Tobias A. [1 ]
Leckie, Rafael M. [1 ]
Kraemer, Stephan [1 ]
Evans, Anthony G. [1 ]
Levi, Carlos G. [1 ]
机构
[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
关键词
D O I
10.1111/j.1551-2916.2007.01990.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
Substitution of TiO(2) for ZrO(2) into single-phase tetragonal (t') 7YSZ has been shown to induce a twofold increase in toughness. This enhancement has been achieved by increasing the tetragonality of the unit cell, upon substituting Ti(4+) for the larger Zr(4+) cation. The observed behavior is consistent with ferroelastic toughening, but direct evidence of the mechanism is lacking. Adding TiO(2) to 7YSZ has the additional benefit that it diminishes the transformability of the depleted tetragonal form: specifically, no monoclinic phase was observed even after equilibration at 1600 degrees C, followed by low-temperature annealing. The combination of properties bodes well for potential application as a thermal barrier coating in gas turbine engines.
引用
收藏
页码:3896 / 3901
页数:6
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