Production of permanent magnet material

Abstract

Abstract PURPOSE:To produce a permanent magnet material which has high coercive force and can generate a high energy product by subjecting a rare earth-Fe-Cu-Zr-Co series alloy to isothermal sintering under specific temp. conditions and a soln. heat treatment, then to 2 stages aging treatments at controlled temps. CONSTITUTION:The magnet alloy consisting of 22-27wt.% >=1 kinds among rare earth elements contg. Y, 12-35% Fe, 4-10% Cu, 1-4% Zr, and the balance Co is continuously heated up to 1,100-1,250 deg.C higher by 30 deg.C than the start temp. at 1,000-1,150 deg.C start temp. and 0.1-10 deg.C/min heating up rate and is subjected to the isothermal sintering at this temp. The alloy is then subjected to the soln. heat treatment at the temp. lower by 5-50 deg.C than the sintering temp. The alloy is subjected to the isothermal treatment at 700-1,000 deg.C and is then cooled down to the temp. lower by >=50 deg.C than said temp. as the 1st stage aging. The alloy is in succession subjected to the isothermal treatment at 700-1,000 deg.C and the temp. higher than the temp. in the 1st stage aging and is continuously cooled down to the temp. lower by >=50 deg.C than the temp. of the 2nd stage cooling at 0.1-30 deg.C/min cooling rate as the 2nd stage aging. The high coercive force is thereby generated in the permanent magnet at the low content of Cu.

Inventors

• 👤 Teruo Kiyomiya
• 👤 Kazuo Matsui
• 👤 Takaaki Yasumura
• 👤 Yasutoshi Mizuno

Bibliographic Details