Preparation of Al_2O_3 Particles Reinforced Heat-Resistant Steel Composites by High Frequency Melting
As ceramics-reinforced metal matrix composites have combined properties of ceramics and metals,they have huge potential application.The Al2O3 / heat-resistant steel composite,which is used in friction and wear condition at elevated temperatures,was prepared by high frequency melting and the vacuum infiltration technique,and the melting temperature,heating time and infiltration time on the casting infiltration depth are studied.The results show that the best anode voltage and time of high Frequency Melting,melting temperature and the casting infiltration time are 7.5 KV,60 s,1 650 ℃,and 4~5 s respectively.The composite prepared has good microstructure,surface quality and interface bonding.