[T15] Hard Materials

[16P-T15-04] Microstructure and Strength of Ni-TiB₂ Composites Containing TiB₂ Different Powder Sizes

*Q. Li¹, K. Matsugi¹, Y. Choi¹, Z. Xu², J. Yu² (1.Hiroshima University, Japan, 2.Yanshan University, China)

Keywords:Ni-TiB2, SPS, Mechanical properties, Particle size

In this study, TiB2 powders of 3μm (S-TiB2) and 63μm (L-TiB2) were utilized. The powders were mixed in proportions where L-TiB2 constituted 0%, 25%, 50%, 75%, and 100% of the total TiB2 mass. TiB2-10Ni composites were then prepared by the SPS sintering method at 1100°C. At this temperature, TiB2 grains did not grow, and the composites contained only TiB2 and Ni phases. where the hardness of the composites with 25% of L-TiB2 can reach 2121 HV, while the relative density of the composites with 50% of L- The composite with 25% L-TiB2 exhibited a hardness of 2121 HV, while the composite with 50% L-TiB2 achieved a relative density of 99.6%. Observations indicated that the composites with 25% and 50% L-TiB2 had smaller Ni-rich areas. The L-TiB2 particles adsorbed a portion of the Ni, inhibiting its aggregation, which in turn improved the density and hardness of the composites.