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采用SRV摩擦磨损试验机研究了球墨铸铁及三维网络Al2O3增强球墨铸铁基复合材料的干摩擦磨损性能,测量了球墨铸铁和复合材料在不同摩擦频率及载荷下的摩擦系数和磨损率;用扫描电镜观察磨损表面形貌,并分析了三维网络Al2O3对复合材料磨损机制的影响。结果表明:陶瓷与金属基体之间具有良好界面结合的三维网络Al2O3/球墨鋳铁复合材料,其摩擦系数随载荷和摩擦频率的变化保持稳定;复合材料的耐磨性能远优于球墨铸铁,而且随着摩擦频率和载荷的增加,复合材料的抗磨损性能明显提高。这是由于复合材料中陶瓷与金属相之间三维空间结构和良好的界面结合有利于摩擦载荷的传递;金属基体中的石墨减摩作用保持摩擦系数的稳定;三维陶瓷骨架在磨损表面形成硬的微突体并起承载作用,制约了基体的塑性变形和高温软化,有利于磨损表面氧化膜的留存。
The friction and wear properties of ductile iron and three-dimensional Al 2 O 3 reinforced ductile iron matrix composites were investigated by SRV friction and wear tester. The friction coefficient and wear rate of ductile iron and composite under different friction frequencies and loads were measured. The wear surface morphology was observed, and the influence of three-dimensional network Al2O3 on the wear mechanism of the composites was analyzed. The results show that the friction coefficient of the three-dimensional network Al2O3 / nodular iron composite with good interfacial bonding between ceramic and metal matrix remains stable with the change of load and friction frequency; the wear resistance of the composite is much better than that of ductile iron, and With the increase of friction frequency and load, the wear resistance of composites increases obviously. This is because the three-dimensional structure of the ceramic and the metal phase in the composite material and the good interfacial adhesion are favorable for the transmission of the friction load; the graphite friction reducing effect in the metal matrix keeps the friction coefficient stable; the three-dimensional ceramic skeleton forms a hard Microcatheter and bearing role, constraining the plastic deformation of the matrix and high temperature softening, is conducive to the wear surface oxide film retention.