Hybrid intermetallic Ru/Pt-modified bond coatings for thermal barrier systems

被引：49

作者：

Tryon, B. ^{[1
]}

Murphy, K. S.

Yang, J. Y.

Levi, C. G.

Pollock, T. M.

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Howmet Res Corp, Whitehall, MI USA

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2007年 / 202卷 / 02期

基金：

美国国家科学基金会;

关键词：

ruthenium aluminide; platinum alummide; thermal barrier coatings; oxidation;

D O I：

10.1016/j.surfcoat.2007.05.086

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

NiAl-based bond coatings for thermal barrier coating (TBC) systems containing varying amounts of Ru and Pt have been investigated. The addition of Ru to bulk NiAl has shown substantial increases in the creep strength of these alummide materials, while Pt-modifications are known to improve the oxidation resistance of NiAl. The oxidation and interdiffusion behavior of these hybrid Ru/Pt bond coat systems are compared to conventional Pt-modified alummide bond coats. The Ru/Pt-modified alummide bond coats demonstrate cyclic oxidation lives comparable to those of Pt-modified alummide bond coatings. These hybrid Ru/Pt-modified bond coats exhibit better creep properties than traditional Pt-modified coatings and suppress the rumpling mechanism typically responsible for the spallation of TBC from Ni(Pt)Al bond coatings. The evolution of coating microstructures at various stages of cyclic life was studied, and phase equilibria issues relevant to the fabrication and oxidation behavior of these multilayer systems are discussed. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：349 / 361

页数：13

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