抄録
The influence of the solute precipitation or the compound precipitation of solute with solvent on the solid state electransport (SSE) was examined by using the Fe-C system from the viewpoint of the purification of metallic materials.
The experiments were carried out under the conditions of the initial carbon concentration=1.3 and 2.1 mass% and the temperature=1223 and 1273 K.
Carbon transported toward the cathode end of the Fe-C alloy specimen by SSE-treatment. When the carbon content reached the saturation content at the cathode end, carbon precipitated there as a graphite. The concentration profile of carbon was fastened to the saturation content at the cathode end. In a short time treatment, a less purification degree was achieved compared with the hypothetical calculation without precipitation. In a longer time treatment, on the other hand, a higher purification degree was achieved by the precipitation.
Even when the specimen with cementite (Fe3C) precipitates was treated, SSE phenomena was observed. The cementite particles near the anode end disappeared and accumulated near the cathode end. In this case, graphite was also precipitated at the cathode end.
