Microstructure, phase composition and oxidation behavior of porous Ti-Si-Mo intermetallic compounds fabricated by reactive synthesis

Abstract

Porous Ti-Si-Mo intermetallic compounds were fabricated by reactive synthesis using C7H10N2O2S as a foaming agent. The effects of Mo content on the microstructure, phase composition and oxidation behavior were investigated. The results show that the porosity and the fractal dimension decreases and then increases as the Mo content increases. It is found that the pore size is mainly distributed in less than 1μm. The phase compositions mainly consist of TiSi, Ti5Si4, Mo5Si3 and TiO, and the Ti5Si3 phase is detected at Mo content of 16 wt.% in particular. In addition, the mass gain of the oxidized samples gradually decreases as the Mo content increases. It is concluded that the oxidation resistance at high-temperature generally decreases as the fractal dimension increases. It is suggested that porous Ti-Si-Mo intermetallic compounds have potential applications in sound absorption and heat dissipation at high-temperature.

Keywords

• porous ti-si-mo intermetallic compounds
• reactive synthesis
• microstructure
• phase composition
• oxidation resistance