Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1995-03-09
1996-05-28
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148102, 75334, 419 29, 419 54, H01F 103
Patent
active
055207480
ABSTRACT:
A process for manufacturing an Alnico system permanent magnet is disclosed in which the alloy powder of the Alnico system having the proper composition is manufactured through a rapid solidification process, so that the crushability and the formability should be superior, the sintered density should be high, and the magnetic properties should be excellent, as well as cheap in its manufacturing cost and simple in its manufacturing process. An alloy of Alnico system is subjected to a rapid solidification with a spinning solidifier wheel speed of 6-40 m/sec, thereby manufacturing a microcrystalline rapidly solidified powder. The powder is ground into a finer powder, and then a press-forming is carried out. Then a sintering is carried out at a temperature of 1100.degree.-1350.degree. C. for 0.5-4 hours. Then based on a single heat treatment, an external magnetizing force of 1-15 kOe is applied in a temperature range of 600.degree.-1000.degree. C., thereby carrying out a heat treatment under a magnetizing force. Thereafter, an aging heat treatment is carried out at a temperature of 500.degree.-700.degree. C. for 1-10 hours, thereby magnetizing the formed body.
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patent: 4342608 (1982-08-01), Willens
Choi Seung D.
Lee Woo Y.
Son Young G.
Yang Choong J.
Pohang Iron & Steel Co. Ltd.
Research Institute of Industrial Science & Technology
Sheehan John
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