抄録
In order to develop highly efficient intermetallic compound material, synthesis process of a multi-component system needs to be established. In this paper, two-step combustion synthesis process of Ti – Ni – Al ternary intermetallic compound was investigated. In the first step combustion synthesis, elemental Ti and Al powders were mixed, and a compact made from the Ti/Al mixed powder was reacted by combustion synthesis. The synthesized product was crushed by a mortar and a ball milling machine, and fine TiAl powder was prepared. In the second step combustion synthesis, the TiAl powder and elemental Ti, Ni and Al powders were mixed, and a compact made from the (TiAl) + (Ti + Ni + Al) mixed powder was reacted by combustion synthesis. For the products obtained, density measurement, microstructure observation, X-ray analysis, Vickers hardness test, and SEM – EDX analysis were performed.
By using the two-step combustion synthesis process, products of about 85 − 90 % density were able to be synthesized. The synthesized product was consisted of matrix phase and dispersed phase. The synthesized phases were ternary intermetallic compound such as Ti2NiAl3(τ3), TiNi2Al(τ4), TiNiAl2(τ2), and the phases corresponded well with Ti – Ni – Al ternary phase diagram. It was confirmed that Ti – Ni – Al ternary intermetallic compound was able to be synthesized by the two-step combustion synthesis process.
