By H. Hoffman
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Extra resources for Casting Metal Parts
No cover flux is necessary for these alloys, especially when clean materials are used; deoxidize with 1 ounce of, 15 percent phosphor-copper, for each 100 pounds of melt. To much deoxidizer well make the metal too fluid, and can result in dirty castings. ý Semi-red brass is handled like red brass. Its composition is normally; 78 percent copper, 2. 5 percent tin, 6 percent Lead, and 7 percent zinc. The pouring temperature range for this alloy is 1950 degrees Fahrenheit for very heavy sections, to 2250 degrees Fahrenheit for very thin sections.
The casting is then pickled to remove the oxide from the metal. The pickling solution can be a 10 percent solution of sulfuric acid in water. The acid-water solution is a little more dangerous, it does a better job. Always pour the acid into the water to prevent splattering of the solution. Pickle the casting until all traces of oxide have been removed, remove and rinse and remove the sprue with either a saw or a suitable pair of nippers. LARGE CASTINGS On large castings, once all the wax is úlost,ý the oven is partially opened and the molds are allowed to cool to an above room temperature so that they may be handled with gloves.
You may have to wait to allow the lower parts to harden depending upon the height of the walls so the upper levels can be supported. The wall is built to the height of the sprue cup and riser ends. A finer mixture of plaster of Paris (two parts), silica (one and a half parts), and water is now prepared after the second layer is added. This mixture is finer because it is intended to create an accurate copy of the surface texture of the model. The plaster acts as a binder medium for the silica, which by itself would not stay suspended or set.