等离子喷涂法制备铁基硬质涂层的力学性能  

Mechanical properties of iron-based hard coatings prepared by plasma spraying technology

作　　者：雷阿利[1] 冯拉俊[1] 沈文宁[1] 王官充[1] 

机构地区：[1]西安理工大学材料学院,西安710048

出　　处：《焊接学报》2013年第4期27-30,114,共4页Transactions of The China Welding Institution

基　　金：国家自然基金资助项目(51174160);教育部博士点基金资助项目(20080700003)

摘　　要：为了在碳钢表面制备耐磨涂层,使涂层与基体的膨胀系数相近,减少涂层应力,将80%Fe,13%P,7%C(质量分数,%)机械混合粉末进行等离子喷涂,制备铁基耐磨涂层.采用粘结剂对偶试样拉伸试验法测定涂层结合强度,采用表面显微硬度法分析涂层硬度,采用MMW-2型(高温)摩擦磨损试验机以40Cr硬质合金为对磨材料对涂层进行耐磨性试验.结果表明,涂层的结合强度平均值为29.16 MPa,显微硬度的平均值为7.889 MPa,高于陶瓷涂层硬度值,涂层的耐磨性能较好,磨损200 min后,涂层的磨损量在36 mg左右,磨损量约为对磨件的1/13,涂层磨损主要为磨粒磨损机制.In order to prepare wear-resistant coating on the surface of carbon steels and make the expansion coefficient of coating close to that of substrate and reduce stress in coating, mechanically mixed powders of 80%Fe, 13%P and 7%C were used to prepare iron-based wear-resistant coating by plasma spraying. The bonding strength was tested using binder dual tensile test method. The hardness in the coating was analyzed by surface microhardness method. And the wear resistance test of coating was carried out by MMW-2 (high temperature) friction and wear testing machine using 40Cr cemented carbide as grinding materials. The results show that the average bonding strength of the coating was 29 MPa, and the average microhardness was 805 HV50, higher than that of ceramic coating. The coating had better wear resistance, and the coating abrasion loss was around 36 mg which was about 1/13 of the grinding material. And the wear mechanism of the coating was mainly abrasive wear.

关 键 词：热喷涂 硬质涂层 结合强度 显微硬度 耐磨性 

分 类 号：TG174[金属学及工艺—金属表面处理]