한국주조공학회

A1203, SiC reinforced Al matrix composites were fabricated by centrifugal spray casting method and their wear resistance characteristics have been studied. Particles are generally uniformly distributed in the microstructure of as-cast specimens. In order to investigate the effect of secondary deformation, hot rolling was performed for each specimen of pure Al matrix com- posites with a reduction of 10, 20, 30, 40 and 50% at 400-500°C, respectively. Microstructure of specimen showed that particle distribution density and hardness increased because of increasing of reduction ratio. Wear test with a various sliding velocity of 1.98, 2.38, 2.88 and 3.53 m/sec showed that the wear resistance characterization of composite improved remarkably compared to the normal alloy and preforms without reinforced particles. Microstructural observation for the worn surface of pure Al specimens without particles showed that a change in wear mechanism seemed to separate layer by surface fatigue. In other case of Al composite reinforced with A1203 and SiC, the grinder type of wear mechanism was shown.

Wear resistance characterization, A1 matrix composites, Centrifugal Spray Casting microstructure, Reinforced particles