Ni-based alloy/submicron WS2 self-lubricating composite coating synthesized by Nd:YAG laser cladding

被引：74
作者：
Wang, A. H. [1 ]
Zhang, X. L. [1 ]
Zhang, X. F. [1 ]
Qiao, X. Y. [1 ]
Xu, H. G. [1 ]
Xie, C. S. [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 475卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
laser cladding; high-energy ball milling; Ni-based alloy matrix WS2 coating; microstructure; friction coefficient; wear resistance;
D O I：
10.1016/j.msea.2007.04.087
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ni-based alloy matrix submicron WS2 self-lubricant composite coatings were synthesized by Nd:YAG laser cladding in the present study. A novel high-energy ball milling method was adopted to encapsulate nano-Ni onto submicron WS2 with an aim to prevent the mass loss Of WS2 during laser cladding process. Microstructure and phases of the laser-clad coatings were investigated to understand laser-cladding behaviors of two kinds of coating materials, i.e., Ni45-WS2-CaF2 and Ni60-WS2 (nano-Ni-encapsulated). The bare submicron WS2 and micron CaF2 were hardly to compose into Ni45 matrix coatings even if increasing the weight percentage of both WS2 and CaF2 from 7.5 to 17.5%. Ni-based alloy matrix submicron WS2 self-lubricant composite coatings were successfully synthesized through laser cladding of the Ni60-WS2 (nano-Ni-encapsulated) coating, since the high-energy ball milling of nano-Ni onto submicron WS2 significantly prevented the oxidization, reaction and vaporization of WS2 and improved the interfacial compatibility between WS2 and Ni60 matrix. The friction coefficient of the laser-clad Ni60-WS2 (nano-Ni-encapsulated) coating was reduced to about 0.36 in comparison with that of the laser-clad M45-WS2-CaF2 and Ni60 coatings (about 0.5-0.6) as well as the wear resistance of the laser-clad Ni60-WS2 (nano-Ni-encapsulated) was three times higher than that of the laser-clad Ni60 coating, respectively. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：312 / 318
页数：7
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