Oxidation Behavior of Overlay NiCoCrAlY and Diffusion Aluminide Coatings Deposited on a Directionally Solidified Nickel-Based Superalloy: A Comparative Study

被引：8

作者：

Hosseini, Yasamin ^{[1
]}

Kermanpur, Ahmad ^{[1
]}

Ashrafizadeh, Fakhreddin ^{[1
]}

Keyvani, Ahmad ^{[2
]}

机构：

[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran

[2] Shahrekord Univ, Fac Technol & Engn, Dept Met & Mat Engn, Shahrekord 8818634141, Iran

来源：

JOM | 2023年 / 75卷 / 01期

基金：

美国国家科学基金会;

关键词：

Aluminum alloys - Aluminum coatings - Chromium alloys - Cobalt alloys - Diffusion - Diffusion coatings - Inorganic coatings - Nickel alloys - Nickel coatings - Scanning electron microscopy - Superalloys - Thermooxidation;

D O I：

10.1007/s11837-022-05575-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high-temperature oxidation resistance of an overlay NiCoCrAlY coating deposited by HVOF process on directionally solidified CMSX-4 nickel-based superalloy was compared with a conventional diffusion aluminide coating. The coatings, produced by industrial processes, were characterized by optical and scanning electron microscopy, EDS micro-analysis and x-ray diffraction. High-temperature oxidation tests were carried out at 1100 degrees C for 300 cycles. It was shown that both coatings improved the oxidation resistance of the superalloy to different levels. After 300 cycles of oxidation, the oxide layers formed on the surface of both coatings included cracks and spallations but the diffusion aluminide coating with a dense structure and a rich aluminide reservoir experienced lower weight changes and therefore higher oxidation resistance than the HVOF overlay NiCoCrAlY coating.

引用

页码：64 / 75

页数：12