喷砂嘴内表面真空高频感应熔覆制备耐磨涂层及其性能  

Preparation and Properties of Vacuum High-Frequency Induction Cladding Wear-Resistant Coating on Inner Surface of Sand Blasting Nozzle

作　　者：王清春[1] 林晨[1] 张娟娟[1] 周昌欢 杜圣恩 WANG Qingchun;LIN Chen;ZHANG Juanjuan;ZHOU Changhuan;DU Sheng＇en(School of Mechanical Engineering,Qingdao University of Technology,Qingdao 266000,China)

机构地区：[1]青岛理工大学机械工程学院,青岛266000

出　　处：《机械工程材料》2018年第9期47-50,54,共5页Materials For Mechanical Engineering

摘　　要：采用真空高频感应熔覆技术在45钢喷砂嘴内表面熔覆制备添加20%(质量分数)WC的Ni60A合金涂层,并分别采用车床和电火花成型机床进行扩孔,分析了涂层和基体的显微组织和硬度分布,并研究了该涂层的摩擦磨损性能。结果表明:涂层具有良好的熔覆质量,平整无裂纹,存在少量孔洞,涂层与基体间为冶金结合;与车床扩孔后的相比,经过电火花成型机床扩孔后涂层外层组织的孔隙率下降,组织更加细化;涂层的硬度远高于基体的,电火花成型机床扩孔涂层外层的硬度高于车床扩孔的;经过150min冲蚀磨损试验后,涂层喷砂嘴的磨损量是未涂层喷砂嘴的11%,涂层喷砂嘴和未涂层喷砂嘴的摩擦因数分别为0.16和0.22,涂层喷砂嘴的耐磨性能显著提高。Ni60 Aalloy coating containing 20 wt% WC was cladded on the inner surface of 45 steel sand blasting nozzle by vacuum high-frequency induction cladding technique,and then the sand blasting nozzle was reamed by lathe and electric discharge shaped machine,respectively.The microstructure and hardness distribution of the coating and substrate were analyzed,and the friction and wear properties of the coating were studied.The results show that the coating had an excellent cladding quality.The coating was smooth and crack-free with a small number of holes.The coating was metallurgical bonding with substrate.After reaming by electric discharge shaped machine,the porosity of the outer layer of the coating decreased and structure was finer compared with that after reaming by lathe.The hardness of the coating was much higher than that of substrate,and the hardness of the outer layer of the coating after reaming by electric discharge shaped machine was higher than that after reaming by lathe.After erosion wear testing for 150 min,the wear loss of the sand blasting nozzle with coating was 11% of that without coating,the friction coefficients of the sand blasting nozzle with and without coating were 0.16 and 0.22,respectively,indicating significantly improved the wear resistance of the sand blasting nozzle cladding with coating.

关 键 词：喷砂嘴 真空高频感应 电火花加工 显微硬度 耐磨性 

分 类 号：TG146.1[一般工业技术—材料科学与工程]