Method of gel-casting a cemented carbide body slurry and gelled body

US7666349B2 · kind B2 · utility

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Eric Laarz · Hagfors, SE
• Karin Andersson · Stockholm, SE

Key dates

• Filing date: Jan 5, 2007
• Grant date: Feb 23, 2010
• Expiry date: Aug 7, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a method of gel-casting WC—Co cemented carbide powder, where the resulting gelled body can be of complex shape and has a high green density, a good homogeneity and sufficiently good mechanical properties for the gelled body to be demolded and dried without significant shape-distortions and cracking. The method relates to the forming of a gelled body through the gelling of an aqueous slurry of WC—Co cemented carbide powder with good dispersion characteristics, where the gelling is achieved by the temperature induced polymerization reaction between a monomer and a cross-linker, catalyzed by a free-radical initiator. By further subjecting the body to drying, heating, and sintering, a dense cemented carbide body is obtained.