Method of making investment casting molds
First Claim
1. A method of forming a ceramic investment shell mold on a fugitive pattern of an article, comprising:
- applying a ceramic slurry on the pattern, applying ceramic particulates heated above ambient temperature on the ceramic slurry before drying said ceramic slurry while said ceramic slurry is wet, and drying the wet ceramic slurry with the ceramic particulates thereon.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of forming a ceramic investment shell mold about a fugitive wax pattern of an article comprises coating the pattern with ceramic slurry, applying a ceramic particulate material heated above ambient temperature to the slurry layer, drying the ceramic slurry layer with ceramic particulates thereon, and repeating said coating, applying and drying steps to build up a shell mold on the pattern. The ceramic slurry with ceramic particulates thereon is dried initially dried for a time using relatively low humidity flowing air at an air temperature above about 80 degrees F. and then subsequently for a time using relatively low humidity flowing air at an air temperature not exceeding about 80 degrees F. Ceramic investment shell molds can be built-up in times typically less than 10 hours by practice of the invention with substantially reduced incidence of shell mold cracking during the shell mold building process and subsequent pattern removal operation.
41 Citations
10 Claims
-
1. A method of forming a ceramic investment shell mold on a fugitive pattern of an article, comprising:
applying a ceramic slurry on the pattern, applying ceramic particulates heated above ambient temperature on the ceramic slurry before drying said ceramic slurry while said ceramic slurry is wet, and drying the wet ceramic slurry with the ceramic particulates thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. A method of forming a ceramic investment shell mold on a fugitive pattern of an article, comprising:
applying a ceramic slurry on the pattern, applying ceramic particulates heated above ambient temperature on the ceramic slurry, and drying the ceramic slurry with the ceramic particulates thereon using drying air having a relative humidity of about 1% to 10%.
Specification