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INERT CALCIA FACECOATS FOR INVESTMENT CASTING OF TITANIUM AND TITANIUM-ALUMINIDE ALLOYS
INERT CALCIA FACECOATS FOR INVESTMENT CASTING OF TITANIUM AND TITANIUM-ALUMINIDE ALLOYS
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机译：用于铸造钛和铝钛合金的惰性氧化钙面漆
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摘要
A calcia mold facecoat is applied to a mold for casting parts composed of reactive metals such as titanium and titanium aluminide. The facecoat is composed of a calcium carbonate based slurry comprising a dense grain calcium carbonate powder and an aqueous based binder. It is applied to a wax or plastic pattern used in the lost wax process for fabricating a casting shell. The mold is built using multiple dipping of alumina- silicate slurries, and then fired at high temperatures in an oxygen rich environment. The metal part is cast before the fired mold can cool below about 800° C. Organometallic based slurry binders are avoided and significant cost savings are realized owing to the benign nature of the aqueous based suspensions with respect to the environment.
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