铜合金表面激光诱导原位反应制备Ni基合金涂层

采用含有定量纳米铝粉的Ni基新合金粉为涂层原材料,利用激光诱导原位反应在Cu-Cr合金表面制备陶瓷相增强Ni基合金涂层.研究了样品涂层的结构和机理.结果表明:在优化的激光诱导原位制备工艺参数条件下,涂层与铜基体之间形成了由涂层元素和基体元素组成且晶粒细小的结合界面结构;纳米铝粉能够提供更多能量促进铜合金表面涂层的形成;涂层中原位生成了直径小于10μm的陶瓷颗粒增强的复合涂层组织结构;涂层成分中纳米铝粉和稀土氧化物的加入,减少了裂纹和孔洞缺陷的形成;表面涂层的平均显微硬度由铜合金基体表面的85 HV提高到了340 HV.

Preparation of Ni-Based Alloy Coating on Cu-Alloy Surface Through Laser-Induced Reaction In-Situ

The newly developed Ni-based alloy containing a certain amount of Al nanopowder was taken to prepare a ceramic-phase coating on Cu-Cr alloy surface through pulse laser-induced reaction in-situ. The microstructure morphology and coating mechanism was studied experimentally. The result showed that under condition of optimized process parameters of the laser-induced reaction in-situ, a bonding interface forms between the substrate and coating, which consists of both coating and substrate elements in form of refined grains. The Al nanopowder can offer more energy to promote the formation of coating, while the cladding structure is reinforced by the ceramic grains whose size are less than 10 μm. The Al nanopowder/RE oxides added in coating serve the function of reducing the formation of cracks/pores. As a result, the average microhardness of the coating is 340 HV instead of 85 HV which is that of the substrate without coating.