【摘要】 在同一工艺参数下在00Cr13Ni4Mo马氏体不锈钢表面制备镀镍碳纳米管质量分数为0.5%～2.0%的钴基合金涂层，利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计、摩擦磨损测试和空泡腐蚀测试等研究了涂层的显微组织、物相组成、显微硬度、耐磨损性能和耐空泡腐蚀性能。结果表明：激光熔覆过程使部分碳纳米管烧损，一部分得以保留，当碳纳米管含量达到1.0%时涂层出现了较明显的裂纹；随着碳纳米管含量的增加，涂层的硬度最高达到680 HV0.05;当碳纳米管含量为1.0%时，涂层的磨损量最低，为0.67 mg,耐磨性提高；由于适量纳米碳管对涂层的细晶强韧化作用，与Stellite6涂层相比，当碳纳米管含量为0.5%时，涂层的空泡腐蚀质量损失由4.93 mg降低到1.86 mg,冲蚀质量损失由1.5 mg降低至0.7 mg,表明涂层的抗空蚀性能和抗冲蚀性能均提高；碳纳米管含量超过1.0%时涂层的抗空蚀性能和抗冲蚀性能均下降。更多还原

【Abstract】 Cobalt-based alloy coatings with nickel-coated carbon nanotube mass fraction of 0.5%-2.0% were prepared on the surface of 00Cr13Ni4Mo martensitic stainless steel under the same process parameters, and microstructure, phase composition, microhardness, wear resistance and cavitation corrosion resistance of the coatings were studied by means of scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS) analysis, X-ray diffraction(XRD), microhardness tester, friction and wear test and cavitation corrosion test. The results show that the some carbon nanotubes are burned out during the laser cladding, and some are preserved. When the carbon nanotube content reaches 1.0%, the coating exhibits obvious cracks. With the increase of carbon nanotube content, the highest hardness of the coating reaches 680 HV0.05. When the content of carbon nanotubes is 1.0%, the wear amount of the coating is the lowest, which is 0.67 mg, and the wear resistance is improved. Due to the grain-refining strengthening and toughening effect of appropriate amount of carbon nanotubes on the coating, compared with the Stellite6 coating, when the carbon nanotube content is 0.5%, the cavitation corrosion mass loss of the coating is reduced from 4.93 mg to 1.86 mg, and the erosion mass loss is reduced from 1.5 mg to 0.7 mg, indicating an improvement in both cavitation resistance and erosion resistance of the coating. When the content of carbon nanotubes exceeds 1.0%, the cavitation resistance and erosion resistance of the coating decrease.更多还原