Fabrication and properties of Al2O3-Al cermet materials using different raw material composition parameter

Cermet application is extensive because it retains the characteristics of ceramic materials and has the advantages of metal materials. In this paper, alumina/aluminum cermet materials were prepared through powder metallurgy method. The influence of raw material formula on the properties of alumina/aluminum cermet was investigated on the basis that ceramic materials have good wear resistance and high thermal conductivity. Results show that when the mass ratio of alumina to aluminum is 1:3, the prepared cermet samples have excellent properties, highest density, and uniform distribution of aluminum and alumina. MgO addition exhibits better effect, higher degree of densification, and renders higher hardness and strength for the sample as compared with SiO2 and Y2O3 addition. The sintered cermet with composite powder prepared via precipitation has better properties and higher densities and surface hardness than that prepared via the ball mill method. The relative density was 97.1%, surface hardness was 875 HV, and electric resistance was 0.0169 Omega.m.