High temperature oxidation behavior of Al added Mo / Mo5SiB 2 in-situ composites

Akira Yamauchi, Kyousuke Yoshimi, Shuji Hanada

研究成果: Conference article査読

2 被引用数 (Scopus)

抄録

Isothermal oxidation behavior of Mo/Mo5SiB2 in-situ composites containing small amounts of Al was investigated under an Ar-20%O 2 atmosphere in the temperature range of 1073-1673 K. The Mo/Mo 5SiB2 in-situ composites, (Mo-8.7mol%Si-17.4mol%B) 100-xAlx (x=0, 1, 3, and 5mol%), were prepared by Ar arc-melting, and then homogenized at 2073 K for 24 h in an Ar-flow atmosphere. Without addition of Al, Mo/Mo5SiB2 in-situ composite exhibits a rapid mass loss at the initial oxidation stage, followed by passive oxidation after the substrate is sealed with borosilicate glass in the temperature range of 1173-1473 K, whereas it exhibits a rapid mass gain around 1073 K. On the other hand, small Al additions, especially of 1 mol%, significantly improve the oxidation resistance of Mo/Mo5SiB 2 in-situ composites at temperatures from 1073-1573 K. The excellent oxidation resistance is considered to be due to the rapid formation of a continuous, dense scale of Al-Si-O complex oxides. The protective oxide scales contain crystalline oxides, and the amounts of the crystalline oxides obviously increase with Al concentration.

本文言語English
論文番号S5.34
ページ(範囲)315-320
ページ数6
ジャーナルMaterials Research Society Symposium Proceedings
842
出版ステータスPublished - 2005 8月 25
イベント2004 MRS Fall Meeting - Boston, MA, United States
継続期間: 2004 11月 292004 12月 2

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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