钛合金表面激光熔覆镍-铬-硅复合涂层的显微组织和摩擦学性能
Microstructure and Tribological Property of Laser Cladding Ni-Cr-Si Composite Coatings on Titanium Alloy
摘 要
在Ti-5621s合金表面采用激光熔覆制备了镍-铬-硅复合涂层,分析了涂层的显微组织,测试了涂层的硬度和摩擦学性能.结果表明:复合涂层中以Ti5Si3和Cr3Si为主的颗粒增强相弥散分布在β-Ti和γ-Ni两相固溶体中;涂层的硬度较基体有显著的提高;由于金属硅化物Ti5Si3和Cr3Si的高硬度、强原子间结合力,该复合涂层明显地改善了基体合金的摩擦和磨损性能.
激光熔覆
镍-铬-硅复合涂层
摩擦学性能
titanium alloy
laser cladding
Ni-Cr-Si composite coating
tribological property
Abstract
Laser cladding of Ni-Cr-Si composite coatings were prepared on Ti-5621s alloy.Microstructure,microhardness,friction and wear properties of the coating were examined.The results show that main reinforcing particles of the composite coating are Ti5Si3 and Cr3Si,which dispersed in the β-Ti and γ-Ni solid solution.The microhardness of the coating increases prominently compared to that of the matrix.Because Ti5Si3 and Cr3Si have high hardness and strong covalent-dominated atomic bonds,the Ni-Cr-Si coating enhances the friction and wear properties of Ti-5621s alloy greatly.
中图分类号 TB331
所属栏目 材料性能及其应用
基金项目 大连市科研基金资助项目(2006A10GX063)
收稿日期 2007/8/24
修改稿日期 2007/11/21
网络出版日期
作者单位点击查看
备注张维平(1964-),男,江苏溧阳人,副教授,博士.
引用该论文: ZHANG Wei-ping,LIU Zhong-hua,ZOU Long-jiang. Microstructure and Tribological Property of Laser Cladding Ni-Cr-Si Composite Coatings on Titanium Alloy[J]. Materials for mechancial engineering, 2008, 32(7): 52～55
张维平,刘中华,邹龙江. 钛合金表面激光熔覆镍-铬-硅复合涂层的显微组织和摩擦学性能[J]. 机械工程材料, 2008, 32(7): 52～55
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参考文献
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【3】Raj S V.An evaluation of the properties of Cr3Si alloyed with Mo[J].Mater Sci Eng,1995,A201:229-241.
【4】Ma Qin.Development and applications of metal silicides[J].Rare Metal Materials and Engineering,1999,28:10-13.
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【6】WU Xiao-lei,CHEN Guang-nan.Microstructure and properties of in-situ synthesized TiC particle reinforced composite coating by laser cladding[J].Acta Metallurgical Sinica,1998,34(12):1284-1288.
【7】LV W J,Zhang X N,Zhang D,et al.Growth mechanism of reinforcement in in-situ processed TiC/Ti composites[J].Acta Metallurgica Sinica,1999,35(5):536-540.
【8】Chen Y,Wang H M.Growth morphology and mechanism of TiC carbide in laser surface alloyed composite coating on substrate of TiAl intermetallics[J].The Chinese Journal of Nonferrous Metals,2002,12(5):863-868.
【9】Przybylowicz J,Kusinski J.Structure of laser cladding tungsten carbide composite coatings[J].Journal Mater Processing Technology,2001,109(8):154-160.
【10】Stolz B,Poprawe R.Surface conductivity modification of ceramics with laser radiation[J].Surface and Coatings Technology,1999,112(2):394-400.
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