Combustion Synthesis of TiC-TiB2-Based Cermets from Elemental Powders

الملخص EN

TiC-TiB2-based cermets with Ni binder were fabricated using combustion synthesis assisted by pseudohot isostatic pressing by heating the compacted powder mixture to approximately 700°C.

The effects of composition on microstructure and hardness of the synthesized samples were investigated.

The samples exhibited finer microstructure and higher hardness as TiC/TiB2 volume ratio increased and as Ni increased up to 30 vol%.

A relatively high hardness value of 1950 HV was obtained for TiC-TiB2-Ni(52.5/17.5/30 vol%).

However, the transverse rupture strength and the modulus of elasticity values were not very high.

This may be due to weak bonding strength of the interface between hard phases and Ni binder and/or insufficient densification of the samples.