Overaluminizing of a CoNiCrAlY Coating by Inward and Outward Diffusion Treatments

被引：9

作者：

Bababdani, Samira Mohseni ^{[1
]}

Nogorani, Farhad Shahriari ^{[1
]}

机构：

[1] Shiraz Univ Technol, Dept Mat Sci & Engn, Shiraz 7155713876, Iran

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 04期

关键词：

HIGH-TEMPERATURE CORROSION; NICKEL-BASE SUPERALLOYS; HOT-CORROSION; ALUMINIDE COATINGS; CYCLIC OXIDATION; MCRALY COATINGS; SUPER ALLOYS; BEHAVIOR; MICROSTRUCTURE; MECHANISMS;

D O I：

10.1007/s11661-013-2138-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Overaluminizing is a commercially accepted treatment to enhance high temperature oxidation resistance of MCrAlY overlay coatings. In the current investigation, a low pressure plasma-sprayed CoNiCrAlY coating was aluminized by two different growth modes: outward growth and inward growth. The resultant microstructures were characterized by means of scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction analysis. The results showed that the final microstructure of both types of overaluminized coatings was similar and included Al-rich NiAl and Ni-rich NiAl zones from the top to the bottom. The details of the microstructures are discussed and compared with the results of simple aluminizing of the nickel-based substrate.

引用

页码：2116 / 2122

页数：7

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