XIA Guanghua, ZHA Lixia, TAN Xunyan, ZHU Xiaoxin, XIE Lin
(School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)
Abstract: Al2O3-TiC/Fe metal-base ceramic composite materials were prepared by means of powder metallurgy method with TiC, C, Mn, Ni, Mo, Cr, reduced Fe and α-Al2O3powders as main raw materials, zinc stearate, paraffin wax and oleic acid as lubricating additives, and alcohol as a solvent. The samples were sintered in vacuum sintering furnace in high vacuum atmosphere of 4.2 Pa at 1520 ℃ and heat-soaked for 90 min. The influence of moulding pressure on water absorption and bulk density was investigated. The results show that the water absorption and bulk density of the sintered Al2O3-TiC/Fe cermets under the moulding pressure of 140 MPa are optimal with the hardness of 467 HB, the flexural strength of 882 MPa, the relative density of 99.6%, and the wearing rate of 0.102%.
Key words: powder metallurgy; vacuum sintering; moulding pressure; mechanical properties