Abstract
Abstract In the melt foaming process of aluminium foams, small pore size aluminium foam is difficult to fabricate, this is mainly due to the early decomposition and poor dispersion of foaming agent (usually TiH2). In this study, these two problems are solved concurrently by introducing a TiH2-AlMg35 composite foaming agent in the melt foaming process. The composite foaming agent was fabricated by premixing the foaming agent (oxidizing treated TiH2) into a low melting point master alloy (AlMg35) melt. Microstructure and particulate distribution of the composite foaming agent were examined. Suitable dispersing parameters were obtained. Aluminium foams, with small pore size, better porous structure uniformity and good process controllability were fabricated using the TiH2-AlMg35 composite foaming agent. Average pore size reached as small as 0.6mm. This process has a simple procedure, low cost, and is suitable for commercial production.
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