Method of making metal composite materials

US5887242A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Mats Nygren · Bromma, SE
• Gunnar Westin · Stockholm, SE
• Asa Ekstrand · Hässelby, SE

Key dates

• Filing date: Sep 25, 1996
• Grant date: Mar 23, 1999
• Expiry date: Sep 25, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C1/051
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of making a hard constituent powder coated with at least one iron group metal, Me, by dissolving and complex binding at least one of Me.sub.n (NO.sub.3).sub.m and Me.sub.n (SO.sub.4).sub.m and other similar Me.sub.n --X.sub.m compounds containing X-groups with low or no carbon content, preferably Me-nitrates, solely or together with one or more metal salts of at least one iron group metal containing organic groups in at least one polar solvent with at least one complex former comprising functional groups in the form of OH or NR.sub.3, (R=H or alkyl). Hard constituent powder is added to the solution. The solvent is evaporated and remaining powder is heat treated in an inert and/or reducing atmosphere. As a result, coated hard constituent powder is obtained which after addition of a pressing agent can be compacted and sintered according to standard practice.