Influence of alloying elements on wettability and reaction of molten aluminum with alumina

Hirofumi Miyahara, Ryuji Muraoka, Nobuyuki Mori, Keisaku Ogi

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Abstract

The effect of alloying elements on the wettability of molten aluminum to alumina substrate were investigated with the sessile drop method in a vacuum of 2 × 10-3 Pa at temperatures from 973 K to 1173 K. The contact angle of molten aluminum on alumina substrate decreased from 109° to 92° as the temperature rose from 973 K to 1173 K. The alloying elements of 5.5%Cu, 15%Cu, 33%Cu, 1.1%Ni, 6%Ni, 10%Si, 0.15%Ti, 0.17%Be, 0.11%Zr and 0.47%Hf had little influence on the wettability to alumina. On the contrary, the addition of 4.1approx.9.7%Mg and 1.7approx.4.2%Li to molten aluminum lowered the contact angle by 10approx.20°. Higher the content of these elements more improved the wettability. Both Al-Li and Al-Mg alloys reacted with pure alumina in Ar atmosphere, and mass spectra and depth profile of positive secondary ions of Al+, Li+, Mg+, O+, LiAl+, LiAlO+, MgAl+, MgO+, etc. revealed that the 0.02approx.0.13 μm thick LiAlO2 and MgAl2O4 were formed at the surface of alumina at 973 K. The thickness of LiAlO2 layer increased proportionately to (reaction time) 1/2 , the temperature and Li content, while the thin reaction layer of MgAl2O4 were almost unchanged even by longer holding until 3600 s at 1173 K.

Original languageEnglish
Pages (from-to)660-665
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume59
Issue number6
DOIs
Publication statusPublished - Jan 1 1995

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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