抄録
As a preliminary experiment, influence of oxygen in atmosphere on the wettability of Pb to Fe plates was investigated. At constant oxygen partial pressure in atmosphere, wettability and infiltration behavior between Pb or its alloys and Fe plates or Fe green compacts were also examined. Results obtained were as follows:
(1) Wettability of Pb to Fe plates was significantly affected by oxygen in atmosphere; wetting proceeds successively with decreasing oxygen partial pressure. This is explained by the hydrogen-reduction of oxides on Pb drops and Fe plates. At constant oxygen partial pressure, wetting proceeds with raising temperature, this being explained mainly by the reduction of surface tension of liquid Pb.
(2) Addition of Sn to Pb is efficient in wetting to Fe plates, especially at lower temperature. In contrast to this, addition of Cu is effective at higher temperature. Addition of both Sn and Cu to Pb is most efficient in wetting to Fe plates over a range from lower and higher temperature.
(3) Infiltration of Pb to Fe green compacts is, as is in the wettability, difficult, but the addition of Sn or Cu to Pb improved the infiltration. Addition of both Sn and Cu improved the infiltration preferencially. Once these infiltrants start to penetrate into Fe green compacts, infiltration is accomplished completely in a few minutes.
