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在氨基磺酸盐电解液中,利用复合电沉积技术制备得到了Co-Ni合金基中弥散分布Al2O3颗粒的金属基复合镀层。通过SEM,AFM以及XRD等分析测试方法,研究了Co-Ni-Al2O3复合镀层的表面形貌和微观晶体结构。结果发现:Co-Ni-Al2O3的表面形貌和微观晶体结构主要受镀层中钴含量的影响。高钴含量复合镀层具有Hcp结构,其表面形貌比具有Fcc结构的低钴含量镀层的表面更加均匀细致。Al2O3颗粒在Co-Ni合金中的共沉积,没有改变合金固溶体的相组成,但却改变了各晶面的优势生长。通过研究复合镀层的硬度、高温耐磨性、高温抗氧化性、热膨胀系数和热导率表明:Co-Ni-Al2O3具有较好的高温耐磨性和高温抗氧化能力,并且高钴含量的复合镀层相对于低钴镀层具有较低的热膨胀系数和较高的热导率。
In the sulfamate electrolyte, the metal-based composite coating with dispersed Al2O3 particles in the Co-Ni alloy matrix was prepared by the composite electrodeposition technique. The surface morphology and microstructure of Co-Ni-Al2O3 composite coating were investigated by SEM, AFM and XRD. The results show that the surface morphology and microstructure of Co-Ni-Al2O3 are mainly affected by the cobalt content in the coating. High cobalt content of the composite coating with Hcp structure, the surface morphology than the low-Co content of the Fcc structure of the coating surface is more uniform and detailed. The co-deposition of Al2O3 particles in Co-Ni alloy did not change the phase composition of the alloy solid solution, but changed the dominant growth of each crystal plane. Through the study of the hardness, high temperature wear resistance, high temperature oxidation resistance, thermal expansion coefficient and thermal conductivity of the composite coating, Co-Ni-Al2O3 has good high temperature wear resistance and high temperature oxidation resistance, and high cobalt content composite The coating has a lower coefficient of thermal expansion and higher thermal conductivity than the low cobalt coating.