[T15] Hard Materials

[16P-T15-07] Effects of Mechanical Ball Milling and Calcination on the Mechanical Properties of Mo₂NiB₂-Ni Cermets

*S. Kawasumi¹, S. Ichijo¹, Y. Harada¹, E. Takahashi¹, R. Sato¹, S. Maruyama¹ (1.Tokyo City University, Japan)

Keywords:Cermets, Boride

Mo₂NiB₂-Ni cermets have been sintered using “Reaction Boronising Sintering” proposed by K. Takagi. In Reaction Boronizing Sintering, there has been a problem with the generation of the inhomogeneous microstructure of the boride phase. In this study, the calcination and mechanical milling processes were introduced to the sintering process of Mo₂NiB₂-Ni cermets to separate the phase formation and densification and refine the microstructure. According to SEM observation, grain size became smaller through the calcination process. As a result, TRS increased from 1.4 GPa to 1.9 GPa. The detailed results, including microstructural observations and the mechanical properties, will be presented on the day.