纳米和微米WC/12Co涂层的电接触强化研究  

Study on Performance of Nano-WC/12Co and Micro-WC/12Co Coating by Electric Contact Strengthening

作　　者：韩志兵[1] 朱世根[1] 齐小犇[1] 许新军[1] 丁浩[1] 

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《表面技术》2013年第4期17-20,共4页Surface Technology

基　　金：上海市重点学科建设资助项目(B602)

摘　　要：分别以微米和纳米WC-12Co粉末为原料配制液态涂料,喷涂于45钢表面形成预喷涂层,再利用电接触表面强化技术对预喷涂层进行强化,获得强化层。观察了强化层的微观形貌,测定了强化层的硬度,分析了强化层的相组成和元素组成、抗热震性能。结果表明:强化层组织致密,硬度高,抗热震性能优异;强化过程中,预喷涂层与基材间发生了元素扩散,从而形成了冶金结合;与微米粉末制备的强化层相比,纳米粉末制备的强化层有更高的硬度和更好的抗热震性能。Based on an air spraying method,micro-WC-12Co powder and nano-WC-12Co powder were deposited on 45 steel respectively.Then the electrical contact strengthened equipment was used to remelt the coatings and the enhancement layers were formed on the substrate surface.The microstructure,hardness and thermal shock performance of the enhancement layers were investigated;The chemical composition and phase constitution of the enhancement layers were analyzed.The results show that the microstructure of enhancement lays are compact.And the enhancement layers poss high hardness and excellent thermal shock resistance.In the process of strengthening,the element diffusion in the interface shows that the metallurgic bonding is formed.Through compared with Micro-WC-12Co Strengthening layer,nano-WC-12Co strengthening layer has higher micro-hardness and more excellent thermal shock resistance.

关 键 词：WC-12CO涂层 电接触强化 抗热震性能 冶金结合 

分 类 号：TG174.45[金属学及工艺—金属表面处理]