Friction and wear properties of Fe matrix composites reinforced with 3D-meshy Al₂O₃

The friction and wear behaviors of spheroidal-graphite iron and its composites reinforced with 3D-meshy Al₂O₃ were investigated on an optimal SRV(Schwinggung Reibungund Verschleiss) testing machine. The friction coefficients and wear rates of the alloy and the iron reinforced by Al₂O₃ were measured at various friction frequencies and loads. The worn surface morphologies of the composites were observed with SEM and the effect of the 3D-meshy Al₂O₃ on the wear mechanisms were discussed accordingly. As the results, the composites with good interfacial bonding between ceramic and metal matrix have stable friction coefficients and much better wear-resistance than that of the spheroidal-graphite iron with increasing normal load. It is supposed that the continuous 3D interconnected ceramic/metal networks and good interfacial bonding provide the Al₂O₃/iron composites with a capability of load transfer. And due to the lubrication action, the spheroidal-graphite in the metal matrix could keep the friction coefficients stability. In addition, the 3D-meshy Al₂O₃ is able to support the load applied onto the sliding surface and to restrict the plastic deformation and high-temperature softening of the iron matrix.