Effects of Cr and Mo elements on the microstructures and compressive properties of the in situ (TiCxNy–TiB2)/Ni cermets

Publication date: Available online 14 February 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Fang Chang, Feng Qiu, Chuanlu Li, Yawei Wang, Qichuan JiangAbstractIn-situ (TiCxNy–TiB2)/Ni cermets with 70 wt% TiCxNy–TiB2 were successfully fabricated by combustion synthesis and hot pressing sintering in Ni-Ti-B4C-BN powder systems. The microstructures, density, compressive properties, and hardness of the TiCxNy–TiB2/Ni cermets with the addition of 0–8 wt% Cr/Mo to the Ni-Ti-B4C-BN powder systems were compared and analysed. The results showed that the ceramic particles distributed uniformly in the cermets, and the size of the ceramic particles reduced with the Cr/Mo addition. Both Cr and Mo addition can improve the hardness, compressive properties, and fracture strains of the cermets. The hardness, compressive strength, and fracture strain of the (TiCxNy–TiB2)/(Ni+Cr) cermets increased from 1561 HV, 2.94 GPa, and 2.9% to 1864 HV, 3.65 GPa, and 3.4%, respectively when the Cr content increased to 5 wt%. The hardness and compressive strength of the (TiCxNy–TiB2)/(Ni+Mo) cermets increased from 1561 HV and 2.94 GPa to 1902 HV and 3.43 GPa, respectively when the Mo content increased to 8 wt%. The cermets with Cr had better compressive properties than the cermets with Mo.
Source: Progress in Natural Science: Materials International - Category: Materials Science Source Type: research