Ni60A+20WC于水刀喷嘴耐磨层的应用工艺

Ni60A + 20WC in water jet nozzle application process wear layer

采用高频感应熔覆技术以提高高压水刀喷嘴的耐磨性能,本实验选用304不锈钢板作为基体材料,Ni60A+20%WC合金粉末作为熔覆层材料;分别采用高频感应加热设备、电火花成型机和小孔机对试件进行加热、熔覆并加工到规定尺寸.采用扫描电子显微镜观察试件的微观组织,发现涂层和基体之间产生了扩散层;采用X射线衍射仪分析涂层相结构,涂层中存在的强化相有WC、Fe_3Ni_2、W2C、Cr_3C_2、Cr_2Ni_3等;摩擦学性能测试实验表明涂层材料大大提高了水刀喷嘴的耐磨性;显微硬度实验表明WC极大地提高了涂层的硬度,其平均值约为1 000 HV0.1,基体约为190 HV0.1.在水刀喷嘴内孔成功制备了WC增强Ni基熔覆层,该熔覆层光滑平整,表面无明显缺陷,与基体实现冶金结合,性能优异.

In this experiment,useing high-frequency induction cladding technology to improve the high-pressure water jet nozzle wear resistance. In this experiment,use 304 stainless steel plate as the base material,Ni60 A ＋20% WC alloy powder as a cladding material; respectively high frequency induction heating equipment,EDM machines and machine holes on the specimen is heated and processed into cladding predetermined size.Scanning electron microscope specimen microstructure was found to produce a diffusion layer between the coating and the substrate; the use of X-ray diffraction analysis of the coating phase structure,strengthening phase present in the coating have WC,Fe3Ni2,W2C,Cr3C2,Cr2Ni3,et al; tribological performance test showed that the coating material greatly improves the wear resistance of the water jet nozzle; microhardness experiments show that WC greatly improve the hardness of the coating,the average is about 1 000 HV0. 1,the matrix is about 190HV0. 1. In the waterjet nozzle holes successfully prepared WC reinforced Ni-based cladding layer,the cladding layer smooth surface no obvious defects,metallurgical bond with the substrate to achieve excellent performance.