Wetting of barium hexaferrite by molten metals

The interaction between molten metals and the sintered magnetic oxide BaFeO has been studied in order to determine its wettability. Pure copper, silver and silver-zinc alloys, insofar as they are very oxygen-active are the metals considered. The pure metals do not wet the ferrite. Introduction of zinc into silver results in a strong interaction between liquid and the ferrite thus giving a marked decrease of the contact angle. Coating the ferrite with an intermediate surface-active metal which forms a solid solution with the molten metal results in complete spreading if the temperature, time of contact and thickness of the deposited metal are adequately controlled. © 1975.