Sintering method with cooling from sintering temperature to below 1200.degree. C. in a hydrogen and noble gas atmosphere

US6071469A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Barbro Rohlin · Djursholm, SE
• Margareta Pålsson · Gimo, SE
• Leif kesson · Alvesta, SE

Key dates

• Filing date: May 6, 1999
• Grant date: Jun 6, 2000
• Expiry date: May 6, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2999/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is disclosed a method of sintering cemented carbide bodies including heating said bodies to the sintering temperature in a suitable atmosphere and cooling. If said cooling at least to below 1200.degree. C. is performed in a hydrogen atmosphere of pressure 0.4-0.9 bar and >0.1 bar noble gas, preferably argon cemented carbide bodies with no surface layer of binder phase are obtained. This is an advantage when said bodies are to be coated with wear resistant layers by the use of CVD-, MTCVD- or PVD-technique.