Fabrication of foamable precursors by powder compression and induction heating process |
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Authors: | S W Youn C G Kang |
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Affiliation: | (1) Department of Precision and Mechanical Engineering, the Pusan National University, P/Busan, South Korea;(2) School of Mechanical Engineering, the Pusan National University, P/Busan, South Korea |
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Abstract: | In the powder compact melting technique, metallic foams are fabricated by heating a precursor, thus initiating cell growth
and foam formation. Proper precursor fabrication is very important because the density distribution after foaming and the
foamability are determined during the precursor-fabrication process. The fabrication of the precursor has to be performed
very carefully because any residual porosity or other defects will lead to poor results in further processing. In order to
evaluate the effect of the compaction parameters on the kinetics of the foaming process, a series of experiments were performed.
In this study, 6061 aluminum foams having a closed-cell structure were fabricated by the powder compact method and an induction
heating process. An induction coil was designed to obtain a uniform temperature distribution over the entire cross-sectional
area of the precursor. To establish the foamable precursor fabrication conditions, the effects of process parameters such
as titanium hydride content (0.1 to 1.5 wt pct) and the compression pressure of the foamable precursor (50 to 150 kN) on the
pore morphology were investigated. |
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Keywords: | |
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