Refractory articles

US8158053B2 · kind B2 · utility

Assignee

• Foseco International Limited · GB

Inventors

• David A. Bell · Stafford, GB
• David L. Jones · Delta, CA
• Kassim Juma · Stafford, GB
• Helmut Jaunich · Raesfeld, DE
• Andreas Ansorge · Borken, DE
• Martin Schmidt · Gmunden, AT

Key dates

• Filing date: Jul 20, 2006
• Grant date: Apr 17, 2012
• Expiry date: Jan 31, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for making a filter suitable for filtering molten metal comprising (i) forming a slurry comprising (a) particles of a refractory material, (b) a binder and (c) a liquid carrier, (ii) coating a disposable former with a slurry, (iii) drying the coated former, (iv) optionally applying one or more additional coats of a refractory material and/or a binder, optionally with liquid carrier, and drying the one or more additional coats, and (v) firing the coated former to produce the filter, wherein the binder is a carbon rich source selected from one or more of the following classes of materials: pitches, tars and organic polymers that degrade to form carbon on pyrolysis.