激光熔覆多元复合硬质合金覆层的组织结构  

Study on microstructure about laser cladding of composite hard alloy coating

作　　者：王忠柯[1] 郑启光[1] 王涛[1] 辜建辉[1] 许德性 李大佛[2] 胡三虎[2] 

机构地区：[1]华中理工大学激光国家实验室,武汉470000 [2]中国地质大学,武汉470000

出　　处：《激光杂志》1999年第6期51-52,54,共3页Laser Journal

基　　金：激光技术国家重点实验室基金

摘　　要：试验研究了多元复合硬质涂层Ｃｏ 基ＴｉＣ－ ＷＣ－ ＴａＣ的激光熔覆，分析结果表明：熔覆层中硬质相及其成分、组织结构分布均匀，硬质相和粘结相及其相互间的润湿性良好，涂层无气孔裂纹缺陷。熔覆层中存在硬质相的溶解、扩散及新相形成。多元复合熔覆层硬度达ＨＣ０－２１２５０ ～ＨＶ０－２１３５０ ，性能优于单一硬质合金涂层Ｃｏ－ ＷＣ、Ｎｉ－ ＷＣ。The investigation has been carried out into the laser cladding of Co base TiC WC TaC metal ceramic.The measuring results showed that hard phases and composites and microstructure uniformly distributed in cladding coating.The phases each other have the good wettability.There are no defects such as porosity and cracks etc.coating.There are dissolving and diffusing of hard phases and new phases forming in laser cladding process.It is also shown that composite hard metals coating has several strengthening mechanism,and the hardness values of HV 0.2 1250～HV 0.2 1350 could be obtained.The properties are superior to only one hard phase cladding such as Co-WC、Ni-WC alloy.

关 键 词：激光熔覆 硬质合金 涂层结构 涂层性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]