INVESTMENT CASTING PINS

摘要

A pin (10) used in investment casting, or the lost wax process, to suppod the ceramic core (4) of a mold (2) includes a core formed of a metal which provides suitable strength to maintain the position of the ceramic core during pouring of molten metal into the mold (2) but which is susceptible to oxidation during firing of the mold. The pin core (10) is encased with an outer coating (14) formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. An intermediate coating (116) is preferably disposed between the core and outer coating (14) and is likewise formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. The invention also includes an investment casting mold using a plurality of these pins (10) and methods of making the pin and the mold.