Ultrafine (Ti, M) (C, N)-based cermets with optimal mechanical properties

A tough and strong cermet with the composition (Ti 20M 0 2V) (C N)-16M-20Ni/Co (M = W Mo) was prepared by mixing WC and Mo2C with ultrafine (Ti M) (C N) powders and then processed via a conventional P/M technique It has an ultrafine and distinct core/rim structure resulting in excellent mechanical properties bending strength of 2210 MPa HV hardness of 14 7 GPa and toughness of 10 1 MPa m(1/2) The small concentration gradient in core/rim composition and the disappearance of inner rims benefit the reduction of the stress concentration at the core/rim interface in (Ti M) (C N)-MxC cermets and thus improve their toughness In addition ultrafine microstructure improves mainly their bending strength and hardness (C) 2010 Elsevier Ltd All rights reserved