Title :
New method of making Nd-Fe-Co-B full dense magnet
Author :
Wada, Masarnl ; Yamashita, Fumitoshi
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
A novel method for fabricating an isotropic fully dense Nd-Fe-Co-B magnet is described. This method consists of a plasma-activating process and a hot-pressing process. The magnetic powder is heated by resistance heating. Plasma activation produces an improvement in the Hcj of the compacted magnet. The pressure range is from greater than 200 kg/cm2 to less than 500 kg/cm2 . Optimum alloy composition is Nd13.5Co1.5B 6Fe64.5, specified by magnetic properties and formability in hot pressing. The magnetic properties of this magnet are 15 MG-Oe for BHmax and 17 kOe for Hcj . The temperature coefficient of Br is -0.07 to -0.08%/°C, and that of Hcj is -0.39 to -0.42%/°C
Keywords :
boron alloys; cobalt alloys; ferromagnetic properties of substances; hot pressing; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; Nd-Fe-Co-B full dense magnet; Nd13.5Co1.5B6Fe64.5; alloy composition; compacted magnet; fabrication; hot-pressing process; magnetic powder; magnetic properties; plasma-activating process; pressure range; resistance heating; temperature coefficient; Ceramics; Electric resistance; Immune system; Magnetic properties; Powders; Pressing; Resins; Resistance heating; Temperature; Welding;
Journal_Title :
Magnetics, IEEE Transactions on
