Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings

被引：12

作者：

Guo, Xiaojie ^{[1
]}

Lin, Chucheng ^{[1
]}

Zhang, Jimei ^{[1
]}

Liu, Ziwei ^{[1
]}

Jiang, Caifen ^{[1
]}

Zheng, Wei ^{[1
]}

Zeng, Yi ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

来源：

MATERIALS | 2019年 / 12卷 / 18期

基金：

国家重点研发计划;

关键词：

thermal conductivity; recrystallized grains; melting; grain size; YTTRIA-STABILIZED ZIRCONIA; BARRIER COATINGS; PHASE-STABILITY; BEHAVIOR;

D O I：

10.3390/ma12182966

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Enhancing the properties of thermal barrier coatings (TBCs) by doping with rare earth elements has been a hot topic for a while. La2O3 and Y2O3 co-doped ZrO2 (La-YSZ) TBCs and yttria-stabilized zirconia (YSZ) TBCs were deposited by atmospheric plasma spraying (APS), and the comprehensive effects of La3+ on the microstructure and property were investigated. The thermal conductivity and microstructure were investigated and were compared with YSZ. The recrystallized fraction components of all TBCs were quantified. It is clearly found that the component of "recrystallized" and "deformed" grains for La-YSZ TBCs is much higher than that for YSZ TBCs. This could be due to La3+ doping enlarging the lattice parameter of YSZ and thus increasing the melting index, which in turns leads to the smaller grain size of La-YSZ TBCs. As a result, the thermal conductivities of La-YSZ TBCs were distinctly lower than those of YSZ TBCs.

引用

页数：9

共 23 条

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