Ruddlesden-Popper structured BaLa2Ti3O10, a highly anisotropic material for thermal barrier coatings

被引：29

作者：

Guo, Lei ^{[1
]}

Guo, Hongbo ^{[1
,2
]}

Ma, Guohui ^{[1
]}

Abbas, Musharaf ^{[1
]}

Gong, Shengkai ^{[1
,2
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Minist Educ Res, Key Lab Aerosp Mat & Performance, Beijing, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2012年 / 38卷 / 05期

关键词：

Thermal properties; Thermal applications; BaLa2Ti3O10 (BLT); Anisotropy; THERMOPHYSICAL PROPERTIES; EXPANSION COEFFICIENTS; CRYSTAL-STRUCTURES; CYCLING BEHAVIOR; OXIDE; MICROSTRUCTURE; CONDUCTIVITY; ZIRCONATE; EXPOSURE; CAZRO3;

D O I：

10.1016/j.ceramint.2012.02.017

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：

BaLa2Ti3O10 (BLT) with Ruddlesden-Popper structure is investigated as a material for thermal barrier coatings (TBCs). BLT shows excellent sintering resistance and remains phase stability at 1500 degrees C for 110 h. After annealing at 1500 degrees C for 1 h, BLT bulk material exhibits c-axis textured structure with c-axis parallel to the hot pressing direction. Thermal expansion coefficients of BLT in a-b plane are in the range of 9.5 x 10(-6)-11.3 x 10(-6) K, those along c-axis range from 10.4 x 10(-6) to 12.1 x 10(-6) K-1, which are comparable to those of 8YSZ. The thermal conductivities of BLT in a-b plane and along c-axis are 1.41-1.71 and 1.31-1.60 W/mK, respectively, nearly 20% lower than those of 8YSZ. The anisotropy in thermo-physical properties is attributed to the insertion of weakly bonded Ba-O layer in the BLT crystal. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：4345 / 4352

页数：8

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