The TiC/Ni composites with 0 wt%, 55 wt% and 70 wt% Ni contents were fabricated by pressureless reactive sintering to study the effect of Ni on the formation mechanism of composites. The results show that the solid reaction between Ti and graphite is controlled by the diffusion of C through TiC layer, and the morphology of TiC layer is similar to the graphite sheet in sample without Ni. By contrast, graphite would dissolve into Ni in samples with Ni, and Ni particles would form continuous skeleton around Ti particles by solid phase sintering. Meanwhile, Ni diffuses into Ti particles to form NiTi compound. Therefore, graphite and C in Ni skeleton reacts with Ti to form TiC layer on whole surface of NiTi particles, resulted in the similar morphology of TiC layers to original Ti particles. Moreover, Ni plays one key role in the liquid phase sintering of TiC/Ni composites by forming NiTiC eutectic phase. The relative density of TiC/Ni composites are higher than 96%, while the samples without Ni shows no obvious shrinkage. The increase of Ni also contributes to the decrease of sintering temperature by enhancing the solution-precipitation process.

通过无压反应烧结制备Ni含量为0wt%、55wt%和70wt%的TiC/Ni复合材料，研究Ni对复合材料形成机理的影响。结果表明，Ti与石墨的固相反应受C通过TiC层的扩散控制，TiC层的形貌与不含Ni的样品中的石墨片相似。相比之下，在含有 Ni 的样品中，石墨会溶解到 Ni 中，并且 Ni 颗粒会通过固相烧结在 Ti 颗粒周围形成连续的骨架。同时，Ni扩散到Ti颗粒中形成Ni Ti化合物。因此，Ni骨架中的石墨和C与Ti反应，在Ni的整个表面形成TiC层Ti 颗粒导致 TiC 层的形态与原始 Ti 颗粒相似。此外，Ni通过形成Ni Ti C共晶相在TiC/Ni复合材料的液相烧结中起关键作用。TiC/Ni 复合材料的相对密度高于 96%，而不含 Ni 的样品没有明显的收缩。Ni的增加还通过增强固溶沉淀过程来降低烧结温度。