铜合金表面MAX相复合涂层的原位制备和组织性能研究  

In-Situ Preparation and Structural Properties of MAX Phase Composite Coatings on Copper Alloys

作　　者：孙蕾 杨盼盼[1] 高卫[1] 刘侠 丁健翔 杨阳 杨康 项腾飞 张世宏[1] Sun Lei;Yang Panpan;Gao Wei;Liu Xia;Ding Jianxiang;Yang Yang;Yang Kang;Xiang Tengfei;Zhang Shihong(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Maanshan 243002,China)

机构地区：[1]安徽工业大学现代表界面工程研究中心,先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002

出　　处：《稀有金属》2024年第8期1132-1143,共12页Chinese Journal of Rare Metals

基　　金：安徽省重点研发计划项目(2022h11020017);安徽省高校优秀青年科研项目(2023AH030027)资助。

摘　　要：面向电磁导轨等应用的铜合金表面具有制备导电耐磨涂层的需求,以MAX-Cu复合涂层为研究对象,针对MAX相粉体成本较高,且MAX相在涂层制备过程中容易氧化分解的难题,提出原位MAX相喷涂涂层制备方法。选择Ti,Al和TiC (Ti-Al-TiC)以及Ti,Al和石墨(TiAl-C)两种粉体组合,通过粉体配比造粒烧结,采用大气等离子喷涂技术在Cu基体表面制备Ti-Al-TiC系和Ti-Al-C系复合涂层,涂层在制备过程中原位生成Ti2AlC等MAX相,设计后期热处理工艺(600~800℃)促进原始粉体反应,提高Ti2AlC等MAX相含量。制备的MAX-Cu复合涂层经热处理后各元素扩散,Ti2AlC等MAX相含量得到提升,Ti-Al-C系复合涂层热处理后各元素互溶效果最佳,且硬度最高为HV0.5687.1。涂层样品整体电导率最高超过90%IACS,具有良好的导电性。聚焦原位MAX-Cu复合涂层制备工艺的探索和组织性能表征,相关研究结果为MAX相在涂层中的应用提供了新的技术路线和研究思路。MAX phases demonstrate good electrical conductivity,high strength and elastic modulus,superior oxidation resistance,as well as strong resistance to damage due to their remarkable combination of ceramic and metallic properties.Therefore,MAX-Cu composite coatings is one of research idea to increase the wear resistance of copper alloys without great sacrifice of electrical conductivity.This will enable them to meet the working conditions of electromagnetic railgun and other applications.To address the high cost of MAX-phase powder and the susceptibility of MAX-phase to oxidation and decomposition during the coating preparation process,we suggest the in-situ preparation of MAX-phase through atmospheric plasma spraying.This paper explored the preparation process and structural property characterization of in-situ MAX-Cu composite coatings.The research results provided new technical routes and research ideas for the application of MAX phase in coatings.Two powder combinations,Ti-Al-TiC and Ti-Al-C,were prepared using powder proportioning granulation and sintering.Ti-Al-TiC and Ti-Al-C composite coatings were then prepared on the surface of Cu substrate using atmospheric plasma spraying technique.MAX phase was in situ generated during the preparation process.The samples underwent heat treatment at 600,700 and 800℃using a vacuum furnace to increase the content of MAX phases.X-ray diffraction(XRD)was performed using a Rigaku Ultima IV instrument with a copper source(Cu Kαradiation,k=0.15406 nm)and a scanning speed of 10(°)·min^(-1) to characterize the phase composition of the samples.The physical phase composition of the samples was determined by analyzing them with XRD using a Rigaku Ultima IV instrument.The microhardness of the samples was analyzed using an MH-5LD microhardness tester with load of 5 N and holding time of 20 s.The microhardness was characterized by calculating the average value of ten selected points.The bonding strength of the coating was tested using the tensile test method with a WDW-5E electroni

关 键 词：MAX相 原位制备 复合涂层 导电性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]