自熔性硬质合金作为在高温、高压下耐磨损、耐腐蚀的保护材料已有应用,但目前多所采用的喷镀工艺,所得到的这种合金层与基体是机械结合,结合强度很低,同时涂层不致密,虽然通过熔融或热处理工艺,可以提高结合强度和涂层的致密性,但仍不能完全克服这两个缺点,而且材料利用率不高。遵照伟大领袖毛主席“自力更生”、“抓革命,促生产,促工作,促战备”的伟大教导,为克服自熔硬质合金喷镀工艺中的上述缺点,我们和大连阀门厂、武汉锅炉厂一同试验研究等离子喷焊的工艺。通过实验室试验的结果表明,等离子喷焊工艺可以使工件表面得到冶金结合的自熔合金喷焊层,合金层完全致密,无气孔无夹渣,并能大大地提高材料的利用率和生产率,及减轻劳动强 Self-fluxing cemented carbide has been used as a wear-resistant and corrosion-resistant protective material under high temperature and high pressure. However, at present, most of the sprayed cemented alloys are mechanically bonded to the substrate. The bonding strength Very low, while the coating is not dense, although by fusion or heat treatment process, can improve the bonding strength and the denseness of the coating, but still can not completely overcome these two shortcomings, and material utilization is not high. In order to overcome the above shortcomings in the self-fluxing cemented carbide plating process, in accordance with the great teaching made by Chairman Mao’s “self-reliance” and “grasping the revolution, promoting production, promoting work and promoting war preparedness”, we and Dalian Valve Factory, Wuhan Boiler Factory Experiment with the plasma spray welding process. The results of laboratory experiments show that the plasma spray welding process can make the surface of the workpiece metallurgical self-fluxing alloy spray welding layer, the alloy layer is fully dense, no porosity without slag, and can greatly improve the material utilization and productivity, And reduce labor