AlCoCrFeNiCu高熵合金在过氧化氢介质中的摩擦磨损性能

Tribological Properties of AlCoCrFeNiCu High Entropy Alloy in Hydrogen Peroxide

利用环-块摩擦磨损试验机研究了A lCoCrFeN iCu高熵合金/GCr15摩擦副在质量百分数为30%、60%、90%H2O2介质及去离子水中,于3种速度下的摩擦磨损行为,利用XRD和SEM研究了高熵合金的相结构和显微组织,并对摩擦磨损前后的表面形貌进行了分析.试验发现:高熵合金与GCr15摩擦副的摩擦系数和磨损量均随H2O2浓度的升高而减小,且高熵合金在H2O2介质中的磨损量远小于纯水中的磨损量.高熵合金在去离子水中以严重的黏着磨损为主,在30%和60%H2O2介质中,高熵合金的磨损机制转变为氧化磨损、磨粒磨损和黏着磨损的综合作用,在高浓度H2O2(90%)中,由于生成的氧化膜较稳定,使得高熵合金的磨损表面仅有很浅的犁沟,磨损程度明显降低.

The tribological properties of AlCoCrFeNiCu high entropy alloy sliding against GCr15 in hydrogen peroxide with different concentrations were evaluated using a ring-on-block wear test machine.The microstructure and morphology of the worn surfaces were analyzed using scanning electron microscopy（SEM） and the surface components of the tested samples were measured by energy dispersive spectrometer（EDS）.The results indicated that the friction coefficient of AlCoCrFeNiCu/GCr15 tended to decrease with increasing concentration of hydrogen peroxide.The wear volume of AlCoCrFeNiCu alloy in hydrogen peroxide was much smaller than that in deionized water.The main wear mechanism was adhesive wear in deionized water,while the friction pair was dominated by a mixture of oxidative wear,abrasive wear and adhesive wear in 30% and 60% H2O2.In contrast with that in other concentrations,the wear resistance of AlCoCrFeNiCu alloy in 90% H2O2 increased significantly due to the formation of a compact oxide film.