宽带激光熔覆WC_P/Ni基合金梯度复合涂层组织与摩擦磨损特性  

MICROSTRUCTURE AND CHARACTER OF FRICTION AND WEAR OF WC_P/Ni BASED ALLOY GRADIENT COMPOSITE COATING BY WIDE-BAND LASER CLADDING

作　　者：刘其斌[1] 朱维东[1] 邹龙江[2] 王存山[2] 夏元良[2] 

机构地区：[1]贵州工业大学材料中心,贵阳550003 [2]大连理工大学三束材料改性国家重点联合实验室,大连116024

出　　处：《复合材料学报》2002年第6期52-56,共5页Acta Materiae Compositae Sinica

基　　金：贵州省科技厅自然科学基金(2000-3024号);贵州省教育厅自然科学基金资助(2000-1248)。

摘　　要：　研究了铸造WCP/Ni基合金梯度复合涂层组织与摩擦磨损特性。结果表明,梯度复合涂层与基材实现了良好的冶金结合,涂层内有γ-Ni枝晶组织,γ-Ni+M23C6共晶组织以及凝固结晶析出的M6C、M23C6、M7C3等块状或条状组织;随着铸造WCP体积分数的增加,复合涂层摩擦系数减小,耐磨性增加。19-4试样的耐磨性最高值为4.61,是基材的3倍以上。梯度涂层的磨损机理为磨粒磨损与粘着磨损的复合作用。In order to eliminate cracks produced in the process of laser cladding, a new kind of gradient composite coating is designed. The experimental results indicate that the excellent metallurgical bonding is formed between the gradient composite coating and the substrate. There are γ-Ni dendrite structure, γ-Ni+M23C6 eutectic structure and M6C, M7C3, M23C6 in the composite coating. With the increment of cast WCp volume fraction, the friction coefficient of the composite coating decreases, but the wear resistance of the composite coating increases. The wear resistance value of 19-4 sample is 4.61, and is increased by three times on an average as compared with that of the substrate. The wear mechanism of the composite coating results from the combination action of abrasive wear and adhesive wear.

关 键 词：宽带激光熔覆 WCp/Ni基合金 梯度复合涂层 组织 摩擦磨损 

分 类 号：TB332[一般工业技术—材料科学与工程]