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

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2601

Lastpage

2603

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 H_cj of the compacted magnet. The pressure range is from greater than 200 kg/cm² to less than 500 kg/cm². Optimum alloy composition is Nd_13.5Co_1.5B ₆Fe_64.5, specified by magnetic properties and formability in hot pressing. The magnetic properties of this magnet are 15 MG-Oe for BH_max and 17 kOe for H_cj. The temperature coefficient of B_r is -0.07 to -0.08%/°C, and that of H_cj 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; Nd_13.5Co_1.5B₆Fe_64.5; 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104811

Filename

104811