Temperature Effect on Early Oxidation Behavior of NiCoCrAlY Coatings: Microstructure and Phase Transformation

被引：0
|
作者：
A. Ullah
A. Khan
Z. B. Bao
Y. F. Yang
M. M. Xu
S. L. Zhu
F. H. Wang
机构：
[1] University of Chinese Academy of Sciences,Shi
[2] Chinese Academy of Sciences,Changxu Innovation Center for Advanced Materials, Institute of Metal Research
[3] Anhui University of Technology,Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, School of Materials Science and Engineering
[4] Jinan University,Institute of Advanced Wear and Corrosion Resistant and Functional Material
[5] Northeastern University,Shenyang National Laboratory for Materials Science
来源：
Acta Metallurgica Sinica (English Letters) | 2022年 / 35卷
关键词：
CrAlY coating; Phase transformation; Isothermal oxidation; Temperature effect;
D O I：
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中图分类号：
学科分类号：
摘要：
Initial oxidation behavior of NiCoCrAlY coating prepared by arc-ion plating has been studied in air at 900, 1000 and 1100 °C. The results showed that phase transformation from transient θ-Al2O3 to α-Al2O3 was highly related to the temperature and oxidation time. The oxide scale in the initial stage was mainly composed of θ-Al2O3 at 900 °C. Instead, more amount of α-Al2O3 emerged out with increasing oxidation temperature. The elemental distribution after oxidation confirmed that faster chromium diffusion to the oxide scale played an important role in the speedy transformation from θ-Al2O3 to α-Al2O3. Y segregation at scale/coating interface resulted in less cavity formation and hence improved the oxide scale adherence.
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页码：975 / 984
页数：9
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