Method for preparing porous titanium-aluminium alloy through powder metallurgy

The invention belongs to the field of porous metal material preparation and relates to a method for preparing a porous titanium-aluminium alloy through powder metallurgy. The method is characterized by uniformly mixing pure titanium hydride powder with pure aluminium powder in different grain sizes, forming a blank through compression molding and carrying out high-temperature sintering in a tube furnace in the presence of an inert gas and a reducing atmosphere, wherein in the process, pure titanium decomposed from titanium hydride and the aluminium powder undergo Kerkendill effect reaction to form a porous titanium-aluminium intermetallic compound; meanwhile, hydrogen generated after decomposition forms the reducing atmosphere; titanium-aluminium reaction can be under the reduction protection of the hydrogen atmosphere at 400-640 DEG C, thus preventing powder oxidation, reducing the oxygen content of the porous titanium-aluminium alloy and improving the mechanical properties of the porous titanium-aluminium intermetallic compound. The method has the beneficial effects that the prepared porous titanium-aluminium intermetallic compound has small and uniform pores; the pore structure parameters of the porous titanium-aluminium intermetallic compound are regulated by changing the ratio of titanium hydride to the aluminium powder, the powder size and the pressing pressure; the process is simple, the cost is low and energy consumption is low.