| 摘要 |
PURPOSE:To provide a casting mold material suitable for casting a high m.p. and high activity metal such as Ti. CONSTITUTION:This casting mold material for casting a high m.p. metal contains 100 pts.wt. powdery mixture of 60-80wt.% silica with 10-20wt.% zircon and/or zirconia, 5-8wt.% magnesia, 8-12wt.% ammonium prim. phosphate and 0.1-2wt.% org. acid, 4.5-8 pts.wt. silica sol and 1.5-3 pts.wt. zirconia sol and gives a casting mold having satisfactory chemical stability to a high activity metal such as Ti, dimensional conformity, work efficiency, operability and a fine casting surface. |
