LI Wenhu
(School of Material Science and Engineering, Shaanxi University of Technology, Hanzhong 723003)
Abstract: Al2O3/TiAl composites were prepared by hot pressing. The effects of Al2O3 volume fraction on relative density, bending strength, fracture toughness and wear resistance of Al2O3/TiAl composites were investigated. The results show that, the relative density of composites is minimum at 20% Al2O3, and with the temperature rising, the composites' relative density is on the increase. The optimal bending strength and fracture toughness is 865.9Mpa and 17.60MPa m1/2 at 15% Al2O3. With the Al2O3 volume fraction rising, the friction coefficient of composites is on the increase, but the wear weightlessness goes down first and then up. The composites' wear weightlessness under different loads is the minimum at 15% Al2O3.
Keywords: hot pressing, Al2O3/TiAl composites, relative density, wear resistance