n-WC-Al_2O_3/Ni-P复合电刷镀层的电接触强化及其耐磨性能  

Electric Contact Strengthening of Electro-Brush n-WC-Al_2O_3/Ni-P Composite Coating and Evaluation of Its Wear Resistance

作　　者：徐梦廓[1] 朱世根[1] 丁浩[1] 

机构地区：[1]东华大学机械工程学院纺织装备教育部工程研究中心,上海201620

出　　处：《材料保护》2016年第6期39-41,7,共3页Materials Protection

摘　　要：为提高镀层的性能以及与基体的结合力,利用高能球磨技术制备出n-WC-Al_2O_3新型复合粉末,再通过纳米电刷镀技术将n-WC-Al_2O_3和Ni-P镀层共同沉积在40Cr基体表面,然后利用电接触强化技术对n-WC-Al_2O_3/Ni-P复合镀层进行再次强化。采用光学显微镜、场发射电镜、热震试验和滚动磨损试验机等对电接触强化前后复合镀层截面、与基体的结合强度以及磨损表面的微观形貌和复合镀层的耐磨性进行了分析。结果显示,经电接触强化后的n-WC-Al_2O_3/Ni-P复合镀层更加致密,与基体结合形式由机械结合变为冶金结合。未经电接触强化的复合镀层的4 h滚动磨损质量损失为815 mg,而经电接触后的4 h滚动磨损质量损失为502 mg,可见电接触强化处理使得复合镀层的耐磨性得到了明显提高。n-WC-Al_2O_3 composite powder was prepared by high energy ball milling method,and then co-deposited with Ni-P on 40 Cr surface by brush plating.Then,the n-WC-Al_2O_3/Ni-P composite coating was reinforced through electric contact strengthening(ECS).The microstructure and properties of the composite coatings were investigated by optical microscopy,field emission scanning electron microscopy,thermal shock test and rolling wear test.Results showed that after ECS,the composite coating became dense,and the bonding between the composite coating and the 40 Cr substrate was changed from mechanical bonding to metallurgical bonding.After rolling wear tests for 4 h,the weight loss of the composite coating without ECS was 815 mg while that of the composite coating with ECS was 502 mg,indicating that the wear performance of the composite coating was improved by ECS treatment.

关 键 词：n-WC-A12O3/Ni-P 复合电刷镀层 电接触强化 微观形貌 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]