Method of making a submicron cemented carbide powder mixture with low compacting pressure and the resulting powder

US8425652B2 · kind B2 · utility

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Ove Alm · Åtvidaberg, SE
• Alistair Grearson · Dudley, GB
• Susanne Norgren · Huddinge, SE

Key dates

• Filing date: Jul 27, 2006
• Grant date: Apr 23, 2013
• Expiry date: Mar 28, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2998/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is disclosed a method of making a ready to press cemented carbide powder with low compaction pressure suitable for the production of submicron cemented carbide by means of powder metallurgical techniques milling, pressing and sintering. The method comprises using from about 1 to about 3 wt-% pressing agent with the following composition, less than about 90 wt-% PEG and from about 10 to about 75 wt-% of blends of high molecular (C12-<C20) saturated or unsaturated fatty acids, or salts thereof containing at least one element of Al, Ba, Ca, Co, Cr, Mg, N, Na, V, Zn. Preferably the grain size of the cemented carbide powder is submicron. In a preferred embodiment the method includes a dry pre-milling of the hard constituents mainly WC-powder for about 2-45 hours in ball mills with cemented carbide milling bodies or using other suitable dry milling techniques prior to a wet milling step. The invention also relates to the powder obtained by the method.