碳纤维含量对碳纤维/中铜石墨复合材料减摩耐磨性能的影响

在干摩擦条件下，对不同碳纤维含量的碳纤维／中铜石墨复合材料，进行了５０ｈ的摩擦磨损试验，并借助扫描电镜观察了它们的磨面。结果表明，随碳纤维含量的增加，碳纤维／中铜石墨复合材料的摩擦系数和磨损量均明显减小。

改善内燃机活塞环减摩耐磨性能的研究

分析了活塞环基体组织、径向弹力及与汽缸套匹配状况对其减摩耐磨性的影响。结果表明:基体组织以回火索氏体、石墨呈细小均匀分布为佳;活塞环的径向弹力以250～300 N为宜。改进后的活塞环处理工艺为调质(920℃淬火+560℃×3 h回火)后再进行稀土离子表面渗氮处理,该工艺可显著改善活塞环的减摩耐磨性能,大幅度延长其使用寿命。

铜合金垫片表面类金刚石薄膜的制备及其摩擦学性能研究

采用物理气相沉积工艺在黄铜H62垫片上制备了DLC薄膜,对DLC薄膜进行了拉曼光谱分析和截面形貌观察,测试了薄膜厚度、纳米硬度和结合力,进行了磨擦磨损试验,分析了薄膜的减摩耐磨性能。结果表明,在H62铜合金垫片制备碳膜为DLC薄膜,薄膜总厚约2.31μm,底层厚约0.49μm。薄膜纳米硬度22.1 GPa,薄膜与基体结合良好,结合性能HF1级,结合力41.1 N。H62铜合金垫片制备DLC薄膜后,摩擦系数由0.55降至0.25,磨损率由1.3×10^(-4)mm^(3)/Nm降至1.1×10^(-5)mm^(3)/Nm,具有优异的减磨性能和耐磨损性能。装拆10次后,垫片表面DLC薄膜完整,基本无损伤,满足使用要求。

Effect of Heat Treatments on Tribology Property of Ti6Al4V Alloy Under Dry Friction

Ti6Al4V alloy manufactured by electron powder bed fusion(EPBF)was separately heat-treated by stress-relief annealing at 600℃,annealing at 800℃,and solid solution at 920℃ for 1 h.Then,the friction and wear tests were conducted on the samples before and after heat treatment to analyze the properties and mechanism of friction and wear behavior.Results show that the sample annealed at 600℃ for 1 h has the optimal wear resistance,and the wear mass loss reduces by 44%.The sample annealed at 800℃ for 1 h possesses the optimal anti-friction performance,and the coefficient of friction reduces by 14%.This research provides a simple heat treatment method to improve the friction and wear resistance of Ti6Al4V alloy manufactured by EPBF.