Comparison of inward and outward grown Pt modified aluminide diffusion coatings on a Ni based single crystal superalloy

被引：84

作者：

Angenete, J ^{[1
]}

Stiller, K

机构：

[1] Chalmers Univ Technol, Dept Expt Phys, SE-41296 Gothenburg, Sweden

[2] Gothenburg Univ, SE-41296 Gothenburg, Sweden

来源：

SURFACE & COATINGS TECHNOLOGY | 2002年 / 150卷 / 2-3期

关键词：

platinum modified aluminide diffusion coatings; RT22; MDC150L; CMSX-4; high temperature oxidation;

D O I：

10.1016/S0257-8972(01)01544-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Two commercial Pt modified aluminide coatings (RT22 and MDC150L) on the same single crystal Ni-based superalloy (CMSX-4) were studied by: scanning electron microscopy; transmission electron microscopy; energy dispersive X-ray spectrometry; and gravimetry. The RT22 coating is an inward grown coating (high activity), while MDC150L is produced by outward growth (low activity). Samples were oxidised in still laboratory air at 1050 degreesC for various times up to 2000 h. It was found that the outward grown coating produced a slower growing oxide that was more spallation resistant. Several possible reasons for this were identified including: coating purity; coating surface topography; and ductile to brittle transition temperature. The microstructural differences between the two coatings in the as-coated condition were investigated and the development of their microstructure during heat treatment was described. A model for coating growth during heat treatment was proposed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：107 / 118

页数：12

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