| 配方類型： |
METALS AND THEIR TREATMENT |
| 配方說明： |
Refractory Mixture |
| 配方組成： |
Sand (140 Mesh)/45.0
Magnesium Oxide/0.4
Sand (35-60 Mesh)/20.0
Silica Flour/34.6 |
| 配制方法： |
To insure even distribution of the magnesium oxide, mix it with the silica flour and then add this mixture to the sand. Magnesium oxide is incorporated as a neutralizing agent for the hydrochloric acid.
Satisfactory results are obtained by mixing 100 cc. (3.4 oz.) of the binder solution with 1 lb. of the refractory mixture. This blend is poured around the wax pattern, settled on a vibrating table, and allowed to gel.
Where a smooth casting and reproduction of fine detail are necessary, a fine-grained refractory composition should be in contact with the fusible pattern. This can be accomplished most economically by using a primary dip coat followed by backing up with the regular investment. |
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