Study on Wear Behavior and Mechanism of Two Friction Pairs in Water Medium
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摘要: 针对水中兵器关键部件在服役过程中发生的摩擦磨损问题, 开展适用于水介质下的摩擦副材料及其摩擦学性能研究。利用激光熔覆技术制备了Co基合金涂层, 研究了Co基合金涂层及Co基合金-PEF复合涂层与2种合金材料在水介质条件下配副时的摩擦学行为, 并与38CrMoAl-锡青铜摩擦副进行了对比。结果表明: 在水介质中, 38CrMoAl-锡青铜摩擦副具有最高的摩擦系数和磨损率, 分别为0.420和1.503×10–5 mm3/(N·m), 磨损机理主要为严重的黏着磨损和磨粒磨损; Co基合金涂层具有较高的显微硬度和抗塑性变形能力, 与GH2130和GH4169对磨时摩擦系数分别为0.209和0.306, 磨损率为2.321×10–6 mm3/(N·m)和4.283×10–6 mm3/(N·m), 磨损机理主要为磨粒磨损; Co基合金-PEF复合涂层与GH2130构成的摩擦副摩擦系数为0.079, 涂层磨损率为1.257×10–8 mm3/(N·m), 在4种摩擦副中表现出最优异的摩擦磨损性能。Abstract: In view of the friction and wear problems of key components of underwater weapons, research on friction pair materials suitable for water media and their tribological properties is carried out. Co-based alloy coatings are prepared by laser cladding technology. The tribological behavior of Co-based alloy coatings and Co-based alloy-PEF composite coatings sliding against two kinds of alloys in water is studied and compared with that of a 38CrMoAl-tin bronze friction pair. The results show that the 38CrMoAl-tin bronze friction pair has the highest friction coefficient and wear rate in water, with values of 0.420 and 1.503×10–5 mm3/N·m, respectively. The wear mechanism mainly involves severe adhesive wear and abrasive wear. The Co-based alloy coating exhibits high microhardness and resistance to plastic deformation. When the Co-based alloy coating slides against GH2130 and GH4169, the friction coefficients are 0.209 and 0.306, while the wear rates are 2.321×10–6 mm3/N·m and 4.283×10–6 mm3/N·m, respectively. The wear mechanism mainly involves abrasive wear. The friction coefficient of the friction pair, Co-based alloy-PEF composite coating and GH2130, is 0.079, and the wear rate is 1.257×10–8 mm3/N·m, which shows the best friction and wear performance among the four friction pairs.
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Key words:
- underwater weapon /
- Co-based alloy coating /
- water medium /
- tribological property /
- wear mechanism
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