Effect of Mo and C additions on magnetic properties of TiC–TiN–Ni cermets

The effect of 2-8 mol.% Mo and 4 mol.% C additions on magnetic properties of TiC-10TiN-30Ni (mol.%) cermet was investigated. Saturation magnetization M-s, remanence M-r and Curie temperature T-c of assintered cermets (1420 degrees C, 1 h) decreased with increasing Mo. This was mainly attributed to that the total content of non-magnetic alloying elements Mo and Ti in Ni-based binder phase increased with increasing Mo in cermets, leading to the weakening of magnetic exchange interaction among Ni atoms in binder phase. The further addition of 4 mol.% C inversely increased M-s, M-r and T-c of cermets, which was mainly attributed to that it decreased the total content of Mo and Ti in binder phase, leading to the strengthening of magnetic exchange interaction among Ni atoms in binder phase. T-c of cermets without C addition was about 250 K at 6 mol.% Mo and 115 K at 8 mol.% Mo, respectively, and that of cermets with 4 mol.% C addition was about 194 K at 8 mol.% Mo. (C) 2015 Elsevier B.V. All rights reserved.