Preparation, microstructure and tribological behavior of laser cladding NiAl intermetallic compound coatings

被引:47
作者
Yu, Youjun [1 ,2 ]
Zhou, Jiansong [1 ]
Chen, Jianmin [1 ]
Zhou, Huidi [1 ]
Guo, Chun [1 ,2 ]
Wang, Lingqian [1 ,2 ]
Yang, Lianbin [3 ]
机构
[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
[3] NW Normal Univ, Coll Chem & Chem Engn, Lanzhou 730070, Peoples R China
基金
中国国家自然科学基金;
关键词
NiAl coating; Intermetallics; Laser processing; Wear testing; MECHANICAL-PROPERTIES; WEAR BEHAVIOR; COMPOSITE; TEMPERATURE; PARTICLES; TENSILE; DUCTILITY; FRICTION; ALLOYS;
D O I
10.1016/j.wear.2011.09.011
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Nickel aluminide (NiAl) intermetallic compound coatings were in situ synthesized from pre-placed mixed powders of Ni and Al by laser cladding. The phase composition and microstructure of the NiAl coatings were studied by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The effects of laser cladding parameters on the microstructure and friction and wear behavior of the NiAl coatings were investigated. It has been found that laser power density had a crucial influence on the microstructure and friction and wear behavior of NiAl coatings. Namely, the NiAl coatings synthesized under a lower power density have more dense and fine microstructure, and lower friction coefficient and wear rate. Besides, the friction and wear behavior of the laser cladding NiAl coatings is highly dependent on applied normal load and sliding speed; and the resulting coatings sliding against Si3N4 in a ball-on-disc contact mode is more suitable for tribological application at a moderate normal load of 3-7 N and sliding speed of 0.16-0.21 m/s. (C) 2011 Elsevier B.V. All rights reserved,
引用
收藏
页码:298 / 305
页数:8
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