Fabrication of zero-thermal-expansion ZrSiO4/Y2W3O12 sintered body

被引:35
|
作者
Yanase, I. [1 ]
Miyagi, M. [1 ]
Kobayashi, H. [1 ]
机构
[1] Saitama Univ, Fac Engn, Dept Appl Chem, Saitama 3388570, Japan
关键词
Composites; Thermal expansion; Yttrium tungstate; Zircon; TMA; GLASS-CERAMICS; COMPOSITES;
D O I
10.1016/j.jeurceramsoc.2009.06.001
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
We focused on the linear negative thermal expansion of Y2W3O12 in a wide-temperature range and on the chemical stability of ZrSiO4 in the fabrication of the composite material ZrSiO4/Y2W3O12 with a zero-thermal-expansion. The compact composed of Y2W3O12 and ZrSiO4 had a thermal shrinkage rate smaller than that of Y2W3O12 and higher than that of ZrSiO4. SEM-EDX observation clarified that the ZrSiO4/Y2W3O12 sintered body fabricated at 1400 degrees C for 10 h had a microstructure composed of ZrSiO4 and Y2W3O12 grains, and XRD indicated that only ZrSiO4 and Y2W3O12 phases existed in the sintered body. The relative density of the ZrSiO4/Y2W3O12 sintered body reached 92%, which was larger than that of the ZrSiO4 sintered body because Y2W3O12 grains could be sintered at lower temperatures. The average linear thermal expansion coefficients of the ZrSiO4/Y2W3O12 sintered body were -0.4 x 10(-6) and -0.08 x 10(-6)degrees C-1 in the temperature ranges from 25 to 500 degrees C and from 25 to 1000 degrees C, respectively, which showed an almost zero-thermal-expansion. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3129 / 3134
页数:6
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