| 摘要 |
PURPOSE:To improve corrosion resistance of a die for casting by using a compsn. for coating formed by mixing a powder compsn. consisting by boron nitride, low melting glaze and inorg. pigment and a liquid compsn. consisting of a silicone resin and org. solvent. CONSTITUTION:A coating is formed on a die which contacts with a molten light metal by using a compsn. for coating 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 coating for the die having excellent corrosion resistance and parting property is thus obtd. and the number of casting times of the die for casting is considerably extended.
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