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、Fe3 Ni2、W2 C、Cr3 C2、Cr2 Ni3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1000 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, Ni60A +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 1000 HV0.1 , the matrix is about 190 HV0.1 . 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.
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