Investment casting compositions
AssigneeRichard D. Shaw
InventorRichard D. Shaw
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Abstract
A composition which comprises a soluble or partially soluble phosphate, a refractory material and less than 1% of an oxide or hydroxide of magnesium or calcium. The composition may be mixed with water to form an investment casting slurry into which a wax pattern may be dipped. Slurry coated onto the pattern may be set by applying a stucco composition which comprises an oxide or hydroxide of magnesium or calcium. Coats of set slurry may be built up on the pattern to form an investment casting shell.
Claims18
A method of producing an investment casting shell comprising the steps of:
- providing a slurry comprising water, a refractory material and a soluble or partially soluble phosphate,
- dipping a pattern in the slurry to form a coat of slurry on the pattern,
- applying a stucco composition which comprises magnesium oxide, calcium oxide, magnesium hydroxide or calcium hydroxide to the slurry coated on the pattern, and
- allowing the slurry and the stucco composition to set to form a shell.
An investment casting composition comprising monoammonium phosphate, monosodium phosphate, a refractory material and less than 1 wt % of an oxide or hydroxide of magnesium or calcium.
Dependencies are inferred from the claim text.