Self-sustainable foaming process of porous aluminum

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On this research, developing a new technology which enables a self-sustainable foaming behavior of porous aluminum was aimed at. The following exothermic powder reaction was used as a source of heat generation.Ti+B_4C→TiB_2+TiCThe precursor containing titanium and boron carbide (B4C) was used for self-sustaining foaming. The following factors were investigated in this research.1. Condition for enabling the self-sustaining foamingIt was revealed that the exothermic powders were necessary to realize the self-sustaining foaming process.2. Observation of the blowing behavior by exothermic reactionBy blending TiH2 in the precursor, the porosity of the foam was proved to be increased.3. Porosity measurement of porous aluminumThe porosity of the aluminum foam was measured by an Archimedes method, and the effect of processing conditions were investigated.4. Observation of the porous structure and evaluation of pore morphologyThe pore morphology was evaluated by an image analyzing software. The pore morphology of the foam fabricated by the self-sustainable foaming process was relatively irregular than the porous aluminum made by the conventional precursor process.5. Temperature profile of the precursor during blowing processIncreasing temperature by adding more titanium powder in the precursor was effective to control the combustion temperature.6. Investigation on the simultaneous processing for making pipe/porous Al integrated componentThe integrated component between porous aluminum and hollow pipe was fabricated by this process. The interface between pipe and foam was not sufficient enough to achieve a chemical bonding.