三维网络结构Al2O3陶瓷/高铬铸铁复合材料干摩擦磨损性能

采用往复式滑动摩擦磨损（SRV）试验机研究了高铬铸铁及三维网络结构Al₂O₃陶瓷增强高铬铸铁复合材料的干摩擦磨损性能，测量了高铬铸铁和Al₂O₃陶瓷/高铬铸铁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陶瓷对复合材料磨损机制的影响。结果表明：陶瓷Al₂O₃与高铬铸铁基体之间具有良好的界面结合，复合材料的摩擦系数随摩擦频率和载荷的变化保持稳定，耐磨性远优于高铬铸铁，而且随着摩擦频率和载荷的增加，Al₂O₃陶瓷/高铬铸铁复合材料的抗磨损性能明显提高，这是由于复合材料中Al₂O₃与高铬铸铁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；三维Al₂O₃陶瓷骨架在磨损表面形成硬的网络突体并起承载作用，能有效保护金属基体；磨损机制为氧化磨损及磨粒磨损共同作用。

Dry friction and wear properties of 3D-meshy Al2O3 ceramic reinforced high chromium iron composites

The dry friction and wear properties of high chromium iron and its composites reinforced with 3D-meshy Al₂O₃ ceramic were investigated on an optimal schwinggung reibungund verschleiss (SRV) testing machine. The friction coefficients and wear rates of high chromium iron and Al₂O₃ ceramic/high chromium iron composites were measured under various friction frequencies and loads. The worn surface morphologies of the alloy and its composites were observed with SEM and the effect of the 3D-meshy Al₂O₃ ceramic on the wear mechanisms of composites was discussed accordingly. As the results, the Al₂O₃ ceramic/high chromium iron composites with good interfacial bonding between ceramic and metal matrix have stable friction coefficients and much better wear-resistance than the high chromium iron with increasing friction frequency and load. It is supposed that the continuous 3D interconnected ceramic/high chromium iron networks and good interfacial bonding provide the metal matrix composites with a capability of load transfer, the 3D-meshy Al₂O₃ ceramic is able to support the load applied onto the sliding surface and to protect the metal matrix;the wear mechanism involves both oxidative wear and abrassive wear.