| 摘要 |
PURPOSE:To improve corrosion resistance of a coated film for a crucible by using a mold parting material formed by mixing a powder compsn. consisting of boron nitride, low melting glaze and inorg. pigment and a liquid compsn. consisting of a silicone resin and org. solvent. CONSTITUTION:A coated film is formed on a base material of a crucible which contacts with an erodable molten metal by using a mold parting material contg. 20-60pts.wt. a powder compsn. consisting, by weight, of 30-80% boron nitride, 1-18% low melting glaze and the balance inorg. pigment and 80-40pts.wt. liquid compsn. consisting of 20-60% silicone resin and the balance an org. solvent soluble with the silicone resin. The coated film having excellent corrosion resistance and mold parting property is thus obtd. and the life of the coated film is considerably extended. |
