溶融Co, Co-Fe合金の表面張力およびAl<SUB>2</SUB>O<SUB>3</SUB>との濡れ性に及ぼす酸素の影響

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  • Effect of Oxygen on the Surface Tension of Liquid Co and Co-Fe Alloys and the Wettability of Al<SUB>2</SUB>O<SUB>3</SUB>
  • 溶融Co,Co-Fe合金の表面張力およびAl2O3との濡れ性に及ぼす酸素の影響
  • ヨウユウ Co Co Fe ゴウキン ノ ヒョウメン チョウリョク オヨビ A

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The surface tensions of liquid Co-O and Co-Fe-O alloys and the contact angles between liquid Co-O and Co-Fe-O alloys, and Al2O3 substrates were measured in Ar+H2+H2O mixtures at 1873 K by the sessile drop method. Solidified Co-O and Co-Fe-O alloys/Al2O3 substrates interfaces were examined by the metallographic observation and EPMA survey.<BR>Main results obtained were as follows:<BR>(1) The surface tensions of liquid Co-O and Co-Fe-O alloys decreased remarkably with addition of a small amount of oxygen, and were independent of the iron content when the oxygen content was less than about 0.06 mass%.<BR>(2) Excess surface concentration of oxygen in the surface layer of liquid Co was 17×10−6 mol/m2 in agreement with the reported values in the liquid Fe-O and Ni-O system, suggesting that the arrangements of the adsorbed oxygen on the surfaces of liquid Ni, Co and Fe were analogous to one another.<BR>(3) The wettabilities of Al2O3 by liquid Co-O and Co-Fe-O alloys increased with increasing oxygen content, especially in iron-rich alloys. This change in the wettability with the iron content is considered to be due to the difference in the affinity for oxygen between cobalt and iron.

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  • 日本金属学会誌

    日本金属学会誌 46 (10), 957-962, 1982

    公益社団法人 日本金属学会

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