Isothermal oxidation of conventional and Pt modified aluminide diffusion coatings on a Ni based superalloy

被引：5

作者：

Angenete, J ^{[1
]}

Bakchinova, E

Stiller, K

机构：

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

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

来源：

HIGH TEMPERATURE CORROSION AND PROTECTION OF MATERIALS 5, PTS 1 AND 2 | 2001年 / 369-3卷

关键词：

high temperature oxidation; platinum modified aluminide diffusion coatings; superalloys;

D O I：

10.4028/www.scientific.net/MSF.369-372.663

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：

The microstructure and microchemistry of two Pt modified and one plain aluminide diffusion coating (RT22, SS82A and PWA73) in the as-coated condition and after heat treatment at 1 050 degreesC for times up to 5 000 h have been investigated by means of Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Spectroscopy (EDS). It was found that high concentrations of Pt in the outer zone of the coating causes precipitation of alpha -W by lowering the solubility of W in the beta -NiAl matrix. Low concentrations of Pt (up to about 4 at%) may have a direct or indirect stabilising effect on beta -NiAl on the Al-deficient side. The interdiffusion zone between the coating and the substrate was observed to grow during heat treatment, due to inward diffusion of Al. A model where the growth of the interdiffusion zone is connected to the inward flux of Al is proposed.

引用

页码：663 / 670

页数：8

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