プリカーサ発泡過程におけるポーラスアルミニウムの接合と接合強度の評価

抄録

Porous aluminum is a multifunctional metal material that is lightweight and has excellent shock absorption. Larger porous aluminum is considered to be necessary for its industrial use. In our previous studies, it has been found that it is possible to joint two porous aluminums by press forming during precursor foaming to increase in size of the porous aluminum by jointing. In this study, porous aluminum with uniform dimensions was fabricated using a mold made of ceramics. And non-destructive internal observation of the fabricated porous aluminum was performed by X-ray CT imaging. Thereafter, the bending strength was examined. First, a rectangular parallelepiped mold was fabricated by combining ceramic plates. Two precursors were placed in the mold and heated by light heating. The precursor then expands by foaming. When the expansion stopped, heating of the precursor was finished, and then press forming was performed to give shape and joint. The fabricated porous aluminum had almost constant dimensions. It was also found that the internal porous structure was sufficiently maintained. Next, a four-point bending test was performed on the fabricated porous aluminum. The case where the fracture occurred from the porous aluminum joint and the case where the fracture occurred from other than the joint showed almost the same bending strength. The bending strength was about 40% that of base porous aluminum.