GNFs/Al2O3/Al基复合材料的微观组织与耐磨性能

Microstructure and wear resistance of GNFs/Al2O3/Al matrix composites

为提高铝基复合材料的耐磨性,采用热压烧结方法制备镀镍石墨烯三氧化二铝混杂增强铝基复合材料。利用SEM、XRD分析复合材料的微观组织及物相,通过摩擦磨损实验测试其耐磨性能。结果表明:超声与电磁复合处理可以将石墨烯分散到铝复合粉体中;利用热压烧结工艺控制,可在复合材料中生成增强体Al2O3;镀镍石墨烯在热压烧结后,表面仍然保留大量的Ni、Sn和P等元素,石墨烯与铝基体的界面反应得到抑制;在干摩擦条件下,随着镀镍石墨烯含量的增加,铝基复合材料的摩擦系数显著降低,波动范围明显减小;当石墨烯质量分数为3.00%时,复合材料摩擦系数降低至0.3以下,耐磨性能显著提高。

This paper is intended to improve the wear resistance of aluminum matrix composites,by preparing nickel-plated graphene Al 2O 3 hybrid reinforced aluminum matrix composites by hot pressing sintering.The study is focused on the analysis of the microstructure and phase of the composites by SEM and XRD,and the test of the wear resistance by friction and wear experiments.The results show that the ultrasonic and electromagnetic composite treatment could disperse graphene into the aluminum composite powder;the heat-pressing sintering process could be used to form the reinforcement Al2O3 in the composite;after the hot-pressed sintering,there remain a large amount of elements such as Ni,Sn,and P,with a consequent suppression of the interfacial reaction between graphene and the aluminum matrix;along with the increase of nickel-plated graphene content under dry friction conditions comes a significant decrease in both the friction coefficient of aluminum matrix composites and the fluctuation range.A remarkable improvement is observed in the wear resistance given the graphene mass fraction of 3.00%and the friction coefficient of the composite material of 0.3 or less.