粉末冶金法によるアルミニウムフォームの発泡特性 Foaming Characteristics of Aluminum Foam Produced by P/M Method

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A powder metallurgical technique for the production of foamed cellular metals with very low apparent densities has been studied. Aluminum powder mixed with a powdered foaming agent, e.g. titanium hydride or zirconium hydride, is extruded at an elevated temperature below the decomposition temperatures of the foaming agents to achieve gas-tight fully densed compacts. Expansion into a porous cellular aluminum is performed by heating the compact to decompose the foaming agent to evolve gas. As the resistance of the aluminum matrix against expansion rapidly decreases by melting, a highly porous cellular aluminum is obtained by heating the compact in a temperature range above the solidus line of the matix. The foamed aluminum produced by free expansion usually shows excessive bulging which is accompanied with a rather large surface roughness and micro-cracks on its bulged surface. A use of a steel sleeve to restrict the bulging of the compacts during expansion is effective both to improve the surface quality and to achieve a higher porosity of the foamed products by preventing the evolved gas to leak.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 44(4), 323-328, 1997-04-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002261315
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4194318
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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