铸铁表面负压铸渗法Ni／WC复合渗层组织和性能  

Microstructure and Properties of Ni/WC Composite Infiltrated Layer on Cast Iron Surface

作　　者：王海棠[1] 李元东[1] 杨贵荣[1] 刘生龙 郝远[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室 [2]酒钢机械制造公司,甘肃嘉峪关735100

出　　处：《表面技术》2008年第5期10-12,共3页Surface Technology

基　　金：甘肃省中俄国际合作项目(4WS064-A72-053)

摘　　要：以制备表面质量良好,硬度较高的铸铁材料为目的,采用负压铸渗法在铸铁表面制备了不同WC含量的Ni基复合渗层,用扫描电镜(SEM)、X射线衍射(XRD)和电子探针(EPMA)等测试手段,分析了渗层的显微结构、相组成、化学成分分布、宏观、显微硬度等。结果表明:渗层中WC颗粒分布均匀,渗层组织致密,界面结合良好;渗层主要由Ni基固溶体、W2C颗粒、NiB和FeB等相组成;显著地提高铸铁表面的硬度。最终在铸铁表面获得了硬度、质量较高的复合渗层,达到制备目的,满足使用要求。In order to obtain the surface of cast iron with higher hardness, better property, lower price, Nibased surface infiltrated composite layer with different content of WC was fabricated on cast iron substrate through vacuum infiltration casting technology. The microstructure, phase, distribution of elements, macro-hardness and micro-hardness were investigated by SEM, XRD, EPMA and other methods. The results show that the distribution of WC in the layer is uniform, the structure of layer is densification, the interface combines very well. The layer is composed of Ni-based solid solution, W2C, NiB and FeB, which can enhance the hardness of layer notable. Finally the obtained layer with good metallurgic property and better hardness on cast iron, which achieves the goal of made and meet the demand of application.

关 键 词：复合渗层 负压铸渗 组织 铸铁 碳化钨 

分 类 号：TG156.8[金属学及工艺—热处理]