Mg_2B_2O_(5W),SiC和Gr颗粒增强6061Al基复合材料的摩擦磨损行为

Friction and Wear Behavior of Mg_2B_2O_(5w),SiC and Gr Particles Reinforced 6061Al Matrix Composite

采用粉末热挤压法制备2%Mg2B2O5w/6061Al,2%Gr/6061Al,2%SiCp/6061Al,2%Mg2B2O5w＋2%Gr/6061A,2%Mg2B2O5w＋2%SiCp/6061Al,2%Mg2B2O5w＋2%Gr＋2%SiCp/6061Al单一及混杂增强的铝基复合材料,并对其耐磨性和摩擦行为进行研究。结果表明：随着载荷的增大,各种复合材料的磨损率均增大,石墨的添加增大了铝基复合材料的磨损率;复合材料的摩擦因数随载荷的增大而降低并趋于稳定,摩擦因数均介于0.22~0.32之间。未加入石墨的复合材料的磨损机制以磨料磨损和轻微的黏着磨损为主,加入石墨后复合材料的磨损机制转变为剧烈的黏着磨损。

Single and hybrid Al matrix composites with 2% Mg2B2O5w/6061 Al,2% Gr/6061 Al,2%SiCp/6061 Al,2%Mg2B2O5w ＋2%Gr/6061 Al,2% Mg2B2O5 w ＋2%SiCp/6061 Al,2% Mg2B2O5 w ＋2%Gr＋2%SiCp/6061 Al reinforcements were prepared by powder hot extrusion process,and the wear resistance and the friction behaviour of the single and hybrid Al matrix composites were studied.The results show that the wear rates of all kinds of the composites increase with the load increasing,the wear rate of Al matrix composites increase with the addition of graphite,the friction coefficients of all kinds of the composites decrease with the load increasing and then become stabilized,the friction coefficient is between 0.22 to 0.32.Abrasive wear and slight adhesive wear dominate the wear mechanism of Al matrix composites without graphite,after the addition of graphite,the wear mechanism of Al matrix composites converts into serious adhesive wear.