Effect of Sintering Temperature on the Densification Mechanism of Al_2O_3-Al Metal Ceramics via the Powder Metallurgy Method

摘要

Alumina ceramics with good mechanical and corrosion resistance are the ones of the most widely used engineering ceramics. The aluminum has high strength, high conductivity and high plasticity etc. so that aluminum ceramics are used in more and more industries. In this paper, the mass fraction of 25% Al_2O_3 powder and the mass fraction of 75% Al powder were mixed in the blender. Mixer speed is 100r/min with mixing time of 3.5 h. Forming, sintering and a series of processes for preparing the alumina/aluminum metallic ceramic materials, through performance testing and analysis, found that the density of the sample firstly increased and then decreased with the increase of sintering temperature. A melting point is close to the sintering temperature and the density of the cermet can be made relatively high. When the sintering temperature is about 600℃ and 700℃, the macro performance of sample is better. The cermet is sintered at 700℃ and its microstructure is relatively better.