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

Abstract

TiC-TiB 2 -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/TiB 2 volume ratio increased and as Ni increased up to 30 vol%. A relatively high hardness value of 1950 HV was obtained for TiC-TiB 2 -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.

Ti(C,N) and WC-Based Cermets: A Review of Synthesis, Properties and Applications in Additive Manufacturing

“…Yu et al fabricated TiC-TiB2-based cermets with Ni binder using combustion synthesis assisted by pseudohot isostatic pressing through heating the compacted powder mixture to approximately 700 °C. TiC-TiB2-Ni (52.5/17.5/30) exhibited high relative density of 93.45% and high hardness of 1950 HV [61].…”

“…As the TaC/(TaC + WC) weight ratio increases, because of Ta, it has a higher tendency to promote the formation of (W, Ta, Ti) (C, N) solid solution; thus, the thickness of the ring phase gradually increases[60].Yu et al fabricated TiC-TiB2-based cermets with Ni binder using combustion synthesis assisted by pseudohot isostatic pressing through heating the compacted powder mixture to approximately 700 °C. TiC-TiB2-Ni (52.5/17.5/30) exhibited high relative density of 93.45% and high hardness of 1950 HV[61].Table1shows the sintering techniques for the preparation of cermets with different binders.…”

Microstructures and Toughening of TiC-TiB2Ceramic Composites with Cr-Based Alloy Phase Prepared by Combustion Synthesis in High-Gravity Field

“…Combustion synthesis is being used to produce ceramics, intermetallics, and composite materials [8,9]. Therefore, a new method, named combustion synthesis under high gravity, has been worked out to prepare high-hardness ceramic or cermets composites.…”