The m-t Transformation and Twinning Analysis of Hot-Pressed Sintered 3YSZ Ceramics

被引:12
作者
Wu, Yu-Chuan [1 ]
Chiang, Yu-Tsung [1 ]
机构
[1] Natl Taipei Univ Technol, Dept Mat & Mineral Resources Engn, Taipei 10608, Taiwan
关键词
MARTENSITIC PHASE-TRANSFORMATION; TRANSMISSION ELECTRON-MICROSCOPY; MOL-PERCENT Y2O3; CRYSTAL-STRUCTURE; TETRAGONAL ZRO2; ZIRCONIA ZRO2; MECHANICAL-PROPERTIES; COMPOSITE POWDERS; MICROSTRUCTURE; TITANIUM;
D O I
10.1111/j.1551-2916.2010.04347.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
Microstructures of 3 mol% yttria-stabilized zirconia (3YSZ) with different content of TiN were investigated in this study by XRD, SEM, and TEM. The specimens were hot-pressing sintered at 1450 degrees C for 2.5 h under 50 MPa in vacuum, and then further characterized on microstructure change and phase distribution. The TiN added to 3YSZ can suppress tetragonal (t) to monoclinic (m)-3YSZ phase transformations, reduce 3YSZ grain size, and improve its mechanical properties. The ceramic was formed of homogeneously dispersed 3YSZ and TiN grains with average size of 0.7 and 1 mu m, respectively. The coexistence of t- and m-phases was observed in one grain, and the nucleation of m-phase with acicular twin occurred preferentially at grain boundaries of t- phase. The TEM analysis was focused on the 3YSZ-30 wt% TiN specimens in order to identify the relationships between t- and m-structures, and twin structures of m-phase. Two crystallographic relations of t- to m-transformation are (100)(m)//(110)(t), [010](m)//[001](t) in type I, and (100)(m)//(110)(t), [001](m)//[001](t) in the type II. The acicular (100)(m) and lathlike (110)(m) twins in m-phase were also observed.
引用
收藏
页码:2200 / 2212
页数:13
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