Laser Cladding to Improve Oxidation Behavior of Air Plasma-Sprayed Ni-20Cr Coating on Stainless Steel Substrate

被引：0
作者：
M. Mudassar Rauf
Muhammad Shahid
A. Nusair Khan
K. Mehmood
机构：
[1] National University of Sciences & Technology,School of Chemical and Material Engineering
[2] Institute of Industrial and Control System,undefined
来源：
Journal of Materials Engineering and Performance | 2015年 / 24卷
关键词：
laser; Ni-20Cr; oxidation; plasma;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Air plasma-sprayed Ni-20Cr coating on stainless steel (AISI-304) substrate was re-melted using CO2 laser to remove the inherent defects, i.e., porosity, splat boundaries, and oxides of air plasma-sprayed coating. The (1) uncoated, (2) air plasma-sprayed, and (3) laser-re-melted specimens were exposed to cyclic oxidation at 900 °C for a hundred cycles run. The oxidation products were characterized using XRD and SEM. Weight changes were determined after every 4th cycle; Uncoated samples showed severe oxidation indicated by substantial weight loss, whereas air plasma-coated samples demonstrated noticeable weight gain. However, oxidation resistance of laser-cladded samples was found to be significantly improved as the samples showed negligible weight change; porosity within the coating was minimized with an improvement in interface quality causing reduction in delamination damage.
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页码：3651 / 3657
页数：6
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