| 摘要 |
PURPOSE:To prevent the occurrence of casting defects such as cracks, cavities and holes, to suppress contamination and to reduce the concn. of oxygen in an alloy by casting a molten transition metal-rare earth metal alloy in a casting mold lined with iron foil. CONSTITUTION:A transition metal-rare earth metal alloy for forming a thin film is melted and cast in a casting mold lined with iron foil. This iron foil prevents the generation of gas which causes casting defects by the contact of the molten alloy with the mold and shrinks together with the molten alloy at the time of solidification to prevent cracking. |
