Ni粉及びNi粉圧粉体の酸化挙動 Oxidation Behavior of Ni Powder and Ni Powder Compact

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Ni powder samples and Ni powder compacts were oxidized at 450, 500 and 550°C up to 40 h in air. The change of oxidation fraction as afunction of time obeyed, for Ni powder samples, the Jander equation withan activation energy of 0.948×10<SUP>5</SUP> J/mol. For the Ni powder compactsthe increase of oxidation fraction was similar, at the beginning, to thatfor free powders but gradually diminished, the final fraction being lessthan unity. The Jander's model was modified, for powder compacts, byintroducing the effect of decrease of concentration difference ofdiffusing species in each particle due to packing of oxide between theparticles. This modified model for compacts gave an activationenergy of 1.113×10<SUP>5</SUP> J/mol. The activation energy of oxidation of bulk Ni samples are much higher than the present ones for powdersor powdrer compacts, The two possible reasons for the discrepancy werediscussed with regard to the difference of oxidation temperatures and tothe tensile stress formed between Ni particles and oxide shells aroundthe paticles.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 44(9), 864-869, 1997-09-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002014595
  • 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
    4304488
  • 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  NDL  J-STAGE 
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