In Situ TiC/TiB_2 Particulate Locally Reinforced Stee Matrix Composites Fabricated Via the SHS Reaction of Ni-Ti-B_4C System

摘要

The composites synthesized with three kinds of B_4C particles mainly consist of TiC, TiB_2, and the alloy austenite containing Ni element. Ceramic particulate sizes in the composites synthesized with ～3.5 and ～45 μm B_4C particles are larger than that synthesized with ～ 140 μm B4C particle. No pores are found between the reinforcing region and matrix in the composites synthesized with ～ 3.5 and ～ 45 μm B_4C particles, while some large pores exist in the composites synthesized with ～ 140 μm B_4C particle. With the decrease of B_4C particle size, the pores in the composites become fewer and the hardness and wear resistance of the composites increase.