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

被引：0
作者：
A. Ullah [1 ,2 ]
A. Khan [1 ,3 ]
Z. B. Bao [2 ]
Y. F. Yang [4 ]
M. M. Xu [2 ]
S. L. Zhu [2 ]
F. H. Wang [5 ]
机构：
[1] University of Chinese Academy of Sciences
[2] Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research , Chinese Academy of Sciences
[3] Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, School of Materials Science and Engineering , Anhui University of Technology
[4] Institute of Advanced Wear and Corrosion Resistant and Functional Material , Jinan University
[5] Shenyang National Laboratory for Materials Science , Northeastern University
来源：
Acta Metallurgica Sinica(English Letters) | 2022年 / 35卷 / 06期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
TG174.4 [金属表面防护技术];
学科分类号：
080503 ;
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-Al2O3to α-Al2O3was highly related to the temperature and oxidation time. The oxide scale in the initial stage was mainly composed of θ-Al2O3at 900 °C. Instead, more amount of α-Al2O3emerged 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-Al2O3to α-Al2O3. Y segregation at scale/coating interface resulted in less cavity formation and hence improved the oxide scale adherence.
引用
收藏
页码：975 / 984
页数：10
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