METHOD OF CASTING USING A MOLD HAVING A REFRACTORY COATING THEREON

• US 3,727,666 A
• Filed: 08/16/1971
• Issued: 04/17/1973
• Est. Priority Date: 08/16/1971
• Status: Expired due to Term

• Current Assignee: Howmet Corporation (Howmet Aerospace, Inc.)
• Original Assignee: Jay Lee Vander Sluis
• Inventors: Vander Sluis, Jay Lee
• Primary Examiner(s): Overholser, J. Spencer
• Assistant Examiner(s): Roethel, John E.
• Application Number:
  US05/171,982
• Time in Patent Office: 610 Days
• Field of Search: 164/72 249/114,115 117/5.3
• US Class Current: 164/72
• CPC Class Codes: B22C 3/00 Selection of compositions for coating the surfaces of moulds, cores, or patterns

Abstract

A metal ingot mold having a thin bonded coating on the mold surface of a finely divided refractory material.

Claims

2. The method as claimed in claim 1 in which the refractory coating is preheated immediately prior to metal pouring to a temperature of at least 400* F.

3. The method as claimed in claim 1 in which the refractory coating is preheated immediately prior to metal pouring to a temperature of at least 1,000* F.

4. The method as claimed in claim 1 in which the metal mold is coated with a coating composItion containing the finely divided refractory material in an amount within the range of 80-95% by weight on the solids basis.

5. The method as claimed in claim 1 in which the finely divided refractory material is selected from the group consisting of silica, zircon, alumina, titania, fused quartz, thoria, mullite, chromite and mixtures thereof.

6. The method as claimed in claim 1 in which the binder is colloidal silica.

7. The method as claimed in claim 1 in which the coating composition contains a hydrophilic emulsifying agent present in an amount within the range of 0.2-2 percent by weight.

8. The method as claimed in claim 7 in which the hydrophilic emulsifying agent is a natural gum.