発泡性ビーズ/ワイヤーを素材とした金属フォーム部品の発泡同時成形法 Expansion Forming of Metallic Foam Parts from Foamable Beads or Wires
An expansion forming technique for the production of foamed cellular metal parts with very low apparent densities has been studied. Gas-tight fully densed beads and wires made from Pb-30Sn powder mixed with a powdered foaming agent, oxibisbenzenesulfonylhydrazide (OBSH), are used as a foamable raw material. Expansion forming into porous cellular parts is successfully performed by heating the foamable raw materials in a die to decompose the foaming agent to evolve gas and to adhere to each other. The foamable wires applied in a die show an expansion to the radial direction to fill the die cross-section which is followed by an expansion in the longitudinal direction, and have the advantage of single-bar preform to achieve a complete fill to the die cavity. As released gas staying in the die cavity leads to insufficient filling, supply of the raw materials and/or adding of the foaming agent play important roles especially in a closed die forming in which foamable beads are applied.
粉体および粉末冶金 45(9), 790-795, 1998-09-15
Japan Society of Powder and Powder Metallurgy