Baking Effect for Outgassing Rate of Titanium Alloy

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  • MURANAKA Takeshi
    Department of Advaced Science and Engineering, Faculty of Engineering, Yamaguchi University
  • KURISU Hiroki
    Department of Advaced Science and Engineering, Faculty of Engineering, Yamaguchi University
  • WADA Naoyuki
    Department of Advaced Science and Engineering, Faculty of Engineering, Yamaguchi University
  • YAMAMOTO Setsuo
    Department of Advaced Science and Engineering, Faculty of Engineering, Yamaguchi University
  • MATSUURA Mitsuru
    Department of Advaced Science and Engineering, Faculty of Engineering, Yamaguchi University
  • HESAKA Masaki
    Shinko Industries Company Limited

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Other Title
  • 高強度低合金チタンにおけるガス放出速度のベーキング温度・ベーキング時間依存性
  • コウキョウド テイゴウキン チタン ニ オケル ガス ホウシュツ ソクド ノ ベーキング オンド ベーキング ジカン イゾンセイ

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Abstract

We have investigated the pre-baking effect for the outgassing property of a titanium alloy. The outgassing rate of the order of 10-12 Pa · m · s-1 is obtained after the modest baking condition, e.g. 100°C × 3 h. This value is lower than that of standard vacuum materials by two orders of magnitude after the ordinary baking condition, e.g. 180°C ×48 h. From the Arrhenius plots of the outgassing rate after the baking at 150°C × 20 h, the activation energy Eq for the outgassing is 0.45 eV. This value is smaller than that for the hydrogen diffusion dissolved in bulk titanium. It is interpreted that the very low hydrogen content occurs at the surface oxide layer by the modest pre-baking treatment.

Journal

  • Shinku

    Shinku 47 (3), 116-119, 2004

    The Vacuum Society of Japan

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