Rare earth element cobalt material for magnet and preparation thereof

Abstract

Abstract PURPOSE:To provide a magnet material having a max. energy product equal to or more than that of a conventional one, low in cost and easy in preparation, obtained by containing a rare earth element, Fe, Cu and Zr in Co in a specific ratio. CONSTITUTION:In a powder sintering type R2T17 type magnet alloy (wherein R is Y and a rare earth element, T is a transition metal), a alloy powder consisting of, on the basis of a wt%, 22.5-27.5% R, 15.0-23.0% Fe, 3.3-5.0% Cu, 1.5- 3.5% Zr and the remainder Co is molded under pressure to be sintered at 1,170- 1,230 deg.C. In the next step, the sintered alloy is subjected to solution heat-treatment at 1,130-1,200 deg.C and, thereafter, cooled at a ratio of 1,500-1,000 deg.C/hr. Subsequently, the treated alloy is heated to be held at 600-950 deg.C and cooled to 500 deg.C at a cooling speed of 0.05-5 deg.C/min. By this method, even if a Co amount is reduced, a magnet material having high magnetic characteristics can be simply prepared.

Inventors

• 👤 Tadakuni Sato
• 👤 忠邦 佐藤
• 👤 Kazuhiro Abe
• 👤 和裕 阿部

Bibliographic Details