Tantalum oxide coatings as candidate environmental barriers

被引：46

作者：

Moldovan, M ^{[1
]}

Weyant, CM ^{[1
]}

Johnson, DL ^{[1
]}

Faber, KT ^{[1
]}

机构：

[1] Northwestern Univ, Robert R McCormick Sch Engn & Appl Sci, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2004年 / 13卷 / 01期

关键词：

environmental barrier coating; plasma spray; tantalum oxide;

D O I：

10.1361/10599630418103

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tantalum (Ta) oxide, due to its high-temperature capabilities and thermal expansion coefficient similar to silicon nitride, is a promising candidate for environmental barriers for silicon (Si) nitride-based ceramics. This paper focuses on the development of plasma-sprayed Ta oxide as an environmental barrier coating for silicon nitride. Using a D-optimal design of experiments, plasma-spray processing variables were optimized to maximize coating density. The effect of processing variables on coating thickness was also determined. X-ray diffraction (XRD) was use to ascertain that the as-sprayed coatings were comprised of alpha- and beta-Ta2O5, but were fully converted to beta-Ta2O5 after a 1200 degreesC heat treatment. Grain growth of the Ta2O5 followed a time dependence of t(0.2) at 1200 degreesC.

引用

页码：51 / 56

页数：6

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