Improvement on the phase stability, mechanical properties and thermal insulation of Y2O3-stabilized ZrO2 by Gd2O3 and Yb2O3 co-doping

被引：93
作者：
Guo, Lei [1 ,2 ]
Guo, Hongbo [1 ,2 ]
Gong, Shengkai [1 ,2 ]
Xu, Huibin [1 ,2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[2] Beihang Univ, Beijing Key Lab Adv Funct Mat & Thin Film Technol, Beijing 100191, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2013年 / 39卷 / 08期
关键词：
Mechanical properties; Thermal conductivity; ZrO2; Thermal applications; BARRIER-COATING APPLICATIONS; THERMOPHYSICAL PROPERTIES; PHYSICAL PROPERTIES; DOPED ZIRCONIA; CONDUCTIVITY; CERAMICS; TRANSFORMATION; YTTRIA; OXIDES; SYSTEMS;
D O I：
10.1016/j.ceramint.2013.04.103
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：
Gd2O3 and Yb2O3 co-doped 3.5 mol% Y2O3-ZrO2 and conventional 3.5 mol% Y2O3-ZrO2 (YSZ) powders were synthesized by solid state reaction. The objective of this study was to improve the phase stability, mechanical properties and thermal insulation of YSZ. After heat treatment at 1500 degrees C for 10 h, 1 mol% Gd2O3-1 mol% Yb2O3 co-doped YSZ (1Gd1Yb-YSZ) had higher resistance to destabilization of metastable tetragonal phase than YSZ. The hardness of 5 mol% Gd2O3-1 mol% Yb2O3 co-doped YSZ (5Gd1Yb-YSZ) was higher than that of YSZ. Compared with YSZ, 1Gd1Yb-YSZ and 5Gd1Yb-YSZ exhibited lower thermal conductivity and shorter phonon mean free path. At 1300 degrees C, the thermal conductivity of 5Gd1Yb-YSZ was 1.23 W/m K, nearly 25% lower than that of YSZ (1.62 W/m K). Gd2O3 and Yb2O3 co-doped YSZ can be explored as a candidate material for thermal bather coating applications. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：9009 / 9015
页数：7
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