Preparation And Properties Of Powder Metallurgy Aluminum Foam

Metallic foam is a new kind of functional material with excellent properties and complex geometry. The idea of producing metallic foam was first investigated over fifty years ago, but its development was restricting for it's hard to control the cellular structure and the pore size. Only in the past twenty years a number of processes have been proven successful.In this paper, a new method-powder foaming method-was bringing forward. Its technical principles is achieving the compressor which relative density can be over 95% by mixing a little blowing agents with AlSi6 powder uniformly, then through compressing, sintering , hot pressing and heating up the compressor to a extend temperature so that the blowing agents decompose H2. Aluminum foams with pore size ranging from 2~5mm, relative density ranging from 0.5~0.8g/cm3 and porosity ranging from 50%~85% have been fabricated successfully by this method. The processing parameters, the effect of the mixing, the pressing parameter, and the foaming temperature, the style of the blowing agents and heat preservation time on the pore constructor were analyzed. The mechanical capability in unilateralism compress of aluminum foams was studied. A cellular module was also established and the relationship of the porosity and the strain of linear-elastic deformation with the pore constructor were achieved.The results show that the optimal processing of aluminum foams which have uniform structure and controlled porosity is that the blowing agents are -200 mu and which mass percentage is 1%, the foaming temperature is 680 C and heat preservation time is 10min.Aluminum foams put up three phases and good energy absorption property when it was unilaterally compressed.