Abstract
A casting precursor method is proposed as a manufacturing method of large aluminum foams with complex shape. The aim of this study is to clarify the effectiveness of the casting precursor method. The columnar precursor with 15 mm diameter was obtained by adding and mixing TiH_2 powder as a foaming agent with aluminum melt. The specimen was machined from the precursor for the foaming test. The free foaming tests were carried out by heating the specimen over the decomposition temperature of TiH_2. The same experimental conditions such as heating temperature and holding time were used for the all free foaming tests in order to investigate the homogeneity of the precursor. The columnar compression test specimen was obtained by foaming the precursor inside a mold. The porosity of the specimens obtained from the free foaming varied. This is because that the TiH_2 particles distribute in the precursor inhomogeneously. The compressive behavior of the foamed specimen is similar to the typical compressive behavior of low density foam.
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