Stainless steel castings
The types of materials that can be investment cast are Stainless steel castings,Metal casting,Aluminum alloys, Bronzes, tool steels, Stellite, Hastelloys, and precious metals. Parts made with investment castings often do not require any further machining, because of the close tolerances that can be achieved.
An investment casting mold is made in foundries by making an impression pattern using wax or foam (lost foam) or some other material that can be melted away from special high pressure dies or tooling. This wax pattern is dipped in refractory ceramic slurry, which coats the wax pattern and forms a skin. After this, the entire pattern is placed in an oven and the wax is melted away. Because the mold is formed around a one-piece pattern (which does not have to be pulled out from the mold as in a traditional sand casting process), very intricate parts and undercuts can be made.
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