Dustfree investment material for accurately fitting cast pieces and method of producing these investment materials

US5250110A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Gerlinde Gantert · Rodenbach, DE
• Bernd Kempf · Alzenau, DE
• Klaus-Peter Gundlach · Bohmte, DE
• Ulrich Kump · Frankfurt am Main, DE

Key dates

• Filing date: Oct 7, 1991
• Grant date: Oct 5, 1993
• Expiry date: Oct 7, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C1/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Dustfree investment materials, for the production of accurately fitting cast parts, are described which contain water-soluble phosphates, magnesium oxide and silicon dioxide. The investment material is made up of two components (a) and (b) and component (a) contains the entire magnesium oxide, optionally a part of the silicon dioxide and, in the presence of silicon dioxide, 0.4 to 6% by weight of a hydrophile, organic solvent, and component (b) contains the phosphate, the remainder of the silicon dioxide and at least 0.5% by weight water.