A study on erosive wear behavior of HVOF sprayed nanostructured WC-CoCr coatings

被引:50
作者
Thakur, Lalit [1 ,2 ]
Arora, Navneet [1 ,2 ]
机构
[1] Indian Inst Technol Roorkee, Mech & Ind Engn Dept, Roorkee 247667, Uttar Pradesh, India
[2] Indian Inst Technol Roorkee, Dept Mech & Ind Engn, Roorkee 247667, Uttar Pradesh, India
关键词
Coatings; Electron microscopy; HVOF; Nanostructured materials; Wear; CAVITATION EROSION; RESISTANCE; SLURRY;
D O I
10.1007/s12206-013-0326-1
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
WC-CoCr cermet coatings were deposited on stainless steel substrate using high-velocity oxy-fuel (HVOF) thermal spray process. The coatings were developed with two different thermal spray powders: one has WC grains of conventional micron size and the other is composed of nanosized (near-nanostructured) grains. HVOF spraying was assisted with in-flight particle temperature and velocity measurement system to control the process parameters that have resulted in quality coatings. Cavitation erosion testing was performed using a vibratory test apparatus based on ASTM standard G32-98. Surface morphology of powders and coatings was examined using the FESEM images, and phase identification was performed by XRD analysis. The erosion behavior of coatings and mechanism of material removal was discussed by examining the microstructure images of worn-out surfaces. WC-CoCr cermet coating deposited with nanosized WC grains exhibited higher cavitation erosion resistance as compared to conventional coating.
引用
收藏
页码:1461 / 1467
页数:7
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