Abstract
Porous Mo2Ti2AlC3 was synthesized by reactive synthesis of the mixed powder of molybdenum, aluminum, titanium hydride and graphite at 1500 °C. The effects of sintering temperature on the phase transition and pore structure parameters of porous Mo2Ti2AlC3 were deeply discussed, and the pore forming mechanism in the sintering process was further deduced. The results showed that the pore formation of porous Mo2Ti2AlC3 consists of the following aspects: (i) At 500 °C, stearic acid was completely pyrolyzed; (ii) At 700 °C, titanium hydride was completely decomposed into titanium and hydrogen via endothermic reaction; (iii) The partial diffusion effect of aluminum in the formation of TiAl and Mo3Al intermetallic compounds; (iv) The solid-solid reaction of titanium and molybdenum with graphite generated TiC and Mo2C; (v) TiC, Mo2C, Ti2AlC, Mo3Al and graphite further reacted to form Mo2Ti2AlC3,where pore formation was mainly controlled by (iii) and (v). In addition, the corrosion resistance and mechanical properties of porous Mo2Ti2AlC3 were also explored.
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