超音速激光沉积与激光熔覆金刚石强化涂层的组织形态  

Microstructure of diamond/Ni60 composite coatings produced by supersonic laser deposition and laser cladding

作　　者：杨理京[1,2] 李祉宏[1,2] 李波[1,2] 吴国龙[1,2] 姚建华[1,2] 

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310014 [2]浙江省高端激光制造装备协同创新中心,浙江杭州310014

出　　处：《材料热处理学报》2016年第6期221-227,共7页Transactions of Materials and Heat Treatment

基　　金：NSFC-浙江两化融合联合基金(U1509201);国家自然科学基金面上项目(51475429)

摘　　要：利用超音速激光沉积和激光熔覆技术分别在中碳钢基材上制备了镍基金刚石复合涂层,并采用扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射分析(XRD)等手段对涂层显微组织特征、相组成进行了对比分析,探究不同工艺制备金刚石强化涂层的可行性。结果表明:激光熔覆复合涂层的金刚石颗粒发生了严重的烧蚀和石墨化相变;而超音速激光沉积复合涂层中金刚石颗粒分布均匀、无相变;超音速激光沉积涂层与原始粉末的衍射图谱、相组成基本一致,而激光熔覆涂层中产生Cr5Si3、Fe3C等新相。Ni-based diamond composite coatings were prepared by supersonic laser deposition（SLD） and laser cladding（LC） on medium carbon steel,respectively.The microstructure characteristics and phases of the coatings were examined by scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS） analysis and X-ray diffraction（XRD）.The results show that the diamond particles are burnt and transformed to graphite in the LC process.The diamond particles without any graphitization are uniformly distributed in the composite coating prepared by the SLD process.The XRD pattern and phases of the SLD coating are similar with those of the composite powder,but the new phases such as Cr5Si3 and Fe3C are found in the LC coating.

关 键 词：冷喷涂 激光熔覆 金刚石 石墨化 镍基合金 

分 类 号：TG174.44[金属学及工艺—金属表面处理]