| 摘要 |
The core material is used for forming an inner cavity of a casting mold. In order to remove the core easily after casting, 50-90 wt.% oxidized plaster with a mixture of α-phase plaster 70-100 wt.% and β-phase plaster 0-30 wt.% is mixed with slurry 5-60 wt.% which is a mixture of anhydrous magnesium sulfate 0-30 wt.% and water 10-50 wt.%, and then it is mixed with one or more compound 40-95 wt.% of zirconia, silica, magnesia, alumina, and chrome sand to give water-soluble core material.
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