Investment casting method and materials

Details Investment casting method and materials Investment casting method and materials

2007-02-27

2007-02-27

Tran, Len (Department: 1725)

Metal founding

Process

Shaping liquid metal against a forming surface

C164S519000

Reexamination Certificate

active

10878871

ABSTRACT:
The present invention consists of an investment casting process that makes use of a frangible low-strength investment material mold and a mold removal solution to facilitate the removal the investment material mold from the casting. The mold removal solution is a liquid that permeates the mold material and effervesces while inside the mold material, causing fracturing of the frangible investment material mold, and carrying away the resulting mold particles. The investment material compositions have the property of sufficiently decreasing in strength after cooling to facilitate the removal of the mold material by the removal solution. Two particular investment material compositions that possesses these properties are describe which contains powdered silica quartz, beta-hemi-hydrate calcium sulfate (gypsum), a hardening agent of potassium sulfate, and water. A mold removal solution composition is described that is composed of hydrogen peroxide solution in water.

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patent: 5605943 (1997-02-01), Solomon

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