Microstructural Characterization and Mechanical Property of Iridium Coating Produced by Double Glow Plasma

被引：0
作者：
Wangping Wu
Xin Lin
Zhaofeng Chen
Zhou Chen
Xiangna Cong
Tengzhou Xu
Jinlian Qiu
机构：
[1] Nanjing University of Aeronautics and Astronautics,College of Material Science and Technology
[2] Northwestern Polytechnical University,State Key Laboratory of Solidification Processing
来源：
Plasma Chemistry and Plasma Processing | 2011年 / 31卷
关键词：
Coating; Morphology; Hardness; Plasma discharge;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Ir is the most interesting as an effective oxygen diffusion barrier for super high-temperature structural materials. In this study, an Ir coating, approximately 7 μm thick, was deposited onto Mo substrate by double glow plasma at substrate temperature of about 1,120 K in an argon atmosphere. The crystal orientation, morphology and mechanical property of the Ir coating were investigated by XRD, SEM, AFM, TEM, nanoindentation and scratch test. The results indicated that the (220)-oriented Ir coating was composed of the columnar grains. The surface roughness of the Ir coating was higher than that of the substrate. The hardness and the elastic modulus of the Ir coating were about 9.5 and 340 GPa, respectively. The coating had a high hardness due to the sub-micrometer size grains. The coating had good scratch resistance due to the strong adhesion of the coating to the substrate.
引用
收藏
页码：465 / 475
页数：10
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