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以钨氧化物、钴氧化物和炭黑为原料,采用创新的原位反应技术快速合成超细WC-η复合粉,在优化的工艺条件下制备复合粉中只含有WC和Co6W6C相,粉末平均粒径为260 nm。复合粉经团聚造粒制备得到具有高致密性和良好流动性的热喷涂粉末,以此粉末作为喂料,利用超音速火焰喷涂技术制备得到超细结构的WC基涂层,其平均显微硬度(HV0.3)达到(14060±340)MPa,孔隙率仅约为0.3%。熔融锌腐蚀结果表明,制备的超细结构WC基涂层具有良好的耐熔锌腐蚀性能,其腐蚀机制主要是锌液沿微裂纹扩散导致涂层自表层向内部出现缓慢的溶解腐蚀,并逐渐形成贯穿性裂纹而引起涂层材料的大块剥落。
Tungsten oxide, cobalt oxide and carbon black as raw materials, the use of innovative in-situ reaction technology for the rapid synthesis of ultra-fine WC-η composite powder prepared under optimized process conditions, the composite powder containing only WC and Co6W6C phase, the average powder Particle size is 260 nm. The composite powder was prepared by agglomeration granulation thermal spray powder with high density and good fluidity, using the powder as a feedstock, ultrafine WC-based coating was prepared by supersonic flame spraying technology, the average microhardness (HV0.3) reached (14060 ± 340) MPa, the porosity was only about 0.3%. The results of molten zinc corrosion show that the prepared ultrafine WC-based coating has good resistance to zinc melting and its corrosion mechanism is mainly that the zinc solution spreads along the micro-cracks and causes the coating to slowly dissolve and erode from the surface to the interior gradually Penetrating cracks form causing massive chipping of the coating material.