原位生成TaC-NbC增强镍基激光熔覆层  

In-situ synthesis of TaC-NbC reinforced Ni-based coatings by laser cladding

作　　者：钱华丽[1] 晁明举[1] 李志华[2] 田得雨[1] 吴花[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,河南郑州450052 [2]周口职业技术学院机电系,河南周口466001

出　　处：《金属热处理》2011年第10期34-38,共5页Heat Treatment of Metals

基　　金：河南省教育厅自然科学研究计划(2006140009)

摘　　要：以Ta2O5、Nb2O5、C和Ni60混合粉末为原料采用激光熔覆技术,在Q235钢表面制备原位生成TaC-NbC复合颗粒增强镍基复合涂层。使用X射线衍射、扫描电镜和EDS能谱,对熔覆层的显微组织和物相构成进行分析。结果表明,在适当工艺条件下,原位生成TaC-NbC复合颗粒增强镍基涂层形貌良好,涂层与基材呈冶金结合。硬度测试和摩擦磨损试验表明,熔覆层具有高的硬度(平均硬度1200 HV0.3)和良好的耐磨性,与纯Ni60熔覆层相比,其摩擦质量损失仅为纯Ni60熔覆层的31%。分析认为,熔覆层硬度和耐磨性提高的原因在于其中形成大量原位生成的TaC-NbC复合颗粒增强相,且均匀分布于基体。The in-situ TaC-NbC reinforced Ni-based composite coating was synthesized by laser cladding on steel Q235.The microstructure and phase were analyzed by X-ray diffractometer,scanning electron microscopy and energy dispersive spectroscopy.The results show that a good finish TaC-NbC particulate reinforced composite coating can be reached by proper laser cladding processes.The experimental results show that the composite coating gives high average hardness of 1200 HV0.3 and excellent wear resistance,which mass lose is 31% as that of pure Ni60 coating.The improvement in hardness and wear resistance is due to the presence of a great deal of in-situ synthesized TaC-NbC particles and their well distribution in the composite coatings.

关 键 词：激光熔覆 原位生成TaC-NbC 显微组织 耐磨性 

分 类 号：TG156.99[金属学及工艺—热处理]