Microstructure and Properties of TiC/Ni₃Al Cermets Prepared by Different Methods

TiC/Ni3Al cermets were prepared using powder metallurgy technology, in which the Ni3Al was synthesized by in-situ reaction between Niand Al or pre-reaction. The effects of Ni3Al content, sintering temperature and Mo addition on microstructure and mechanical properties of cermets were studied. The results show that both cermets prepared by these two methods have typical core-rim structure as traditional cermets. With the increase of Ni3Al content, the density and bending strength of the cermets constantly increased, while the hardness had a tendency of rise followed by drop. The hardness and bending strength of cermets at temperature 1 450 ℃ were favorable. Addition of Mo could improve the bending strength but decrease the hardness of TiC/Ni3Al cermet. When Mo content was 10 wt.%, the TiC/30% Ni3Al had a comprehensive mechanical property, and the bending strength and hardness of TiC/Ni3Al cermet were 1 330 MPa and 85.8 HRA, respectively.