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

被引：2

作者：

Rauf, M. Mudassar ^{[1
]}

Shahid, Muhammad ^{[1
]}

Khan, A. Nusair ^{[2
]}

Mehmood, K. ^{[2
]}

机构：

[1] Natl Univ Sci Technol, Sch Chem & Mat Engn, Islamabad, Pakistan

[2] Inst Ind & Control Syst, Rawalpindi, Pakistan

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2015年 / 24卷 / 09期

关键词：

laser; Ni-20Cr; oxidation; plasma; HIGH-TEMPERATURE OXIDATION; THERMAL BARRIER COATINGS; CORROSION-RESISTANCE;

D O I：

10.1007/s11665-015-1632-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

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 A degrees 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.

引用

页码：3651 / 3657

页数：7

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