溶融Fe-Ni, Fe-Co, Ni-Co2元系合金の表面張力およびAl₂O₃との濡れ性

抄録

Surface tensions of liquid Fe-Ni, Fe-Co and Ni-Co binary alloys and contact angles between these alloys and Al₂O₃ substrates were measured in an atmosphere of purified hydrogen by the sessile drop method. Measured surface tensions of these alloys varied almost linearly with the alloy composition.
The wettability of Al₂O₃ by liquid alloys increased drastically with an increase in Ni content in Fe-Ni and Ni-Co alloys, and increased proportionally with an increase in Co content in Fe-Co alloys. Uneveness of the interfaces between solidified alloys and Al₂O₃ substrates was observed with an increase in the wettability, especially in Fe-Ni and Ni-Co alloys. This phenomenon can be explained on the basis of the thermodynamical consideration on the dissociation of Al₂O₃ in contact with the liquid alloys.