激光技术2017，Vol.41Issue(1)：40-46,7.DOI:10.7510/jgjs.issn.1001-3806.2017.01.009
纯铜表面脉冲激光熔覆Ni60涂层的结构与性能研究
Investigation of structure and properties of Ni60 coatings on pure copper by pulsed laser cladding
房永祥 1齐丽君 1王珂 1王海林 1朱长虹 1朱广志 1朱晓1
作者信息
- 1. 华中科技大学 光学与电子信息学院 激光加工国家工程研究中心,武汉430074
- 折叠
摘要
Abstract
In laser cladding, it was difficult to accumulate heat on the pure copper surface for forming effective metallurgical bonding between copper and Ni60 coatings. In order to overcome the difficulties, a method of pulsed laser cladding assisted with preheating was adopted. Laser cladding experiments on copper substrate were conducted, and a 3-D transient thermo-elastic-plastic model was developed to simulate the thermal process and residual stress. When the preheating temperature reached 573K, the cracks in Ni60 cladding layer were completely eliminated. The processing efficiency of laser cladding was increased 2. 2 times when preheating temperature was 673K. The average hardness of the Ni60 coating obtained by laser cladding assisted with preheating was 800HV0. 2 . Under normal temperature, the relative wear resistance of Ni60 coating and ASTM52100 steel was 4. 45. Friction coefficient of Ni60 coating was 57% of ASTM52100 steel or copper. The results show that with the increase of the preheated temperature, the number of cracks in Ni60 coating decreases and processing efficiency of laser cladding increases. Also, the surface hardness of Ni60 coatings improves and friction coefficient decreases effectively. By pulse laser cladding assisted with preheating, Ni60 cladding layer on pure copper without cracks and air holes is obtained.关键词
激光技术/Ni60涂层/预热辅助脉冲激光熔覆/纯铜/残余应力/耐磨性Key words
laser techniques/Ni60 coating/pulsed laser cladding with preheating/pure copper/residual stress/wear re-sistance分类
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房永祥,齐丽君,王珂,王海林,朱长虹,朱广志,朱晓..纯铜表面脉冲激光熔覆Ni60涂层的结构与性能研究[J].激光技术,2017,41(1):40-46,7.
