Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-05-23
1990-08-28
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148104, 419 11, 419 12, 419 14, 419 35, H01F 108
Patent
active
049522515
ABSTRACT:
Anisotropic hot-worked permanent magnets are made from an R-T-B alloyed powder to which is added a combination internal lubricant including a carbon-based material such as graphite and a glass material such as glass from the B.sub.2 O.sub.3 -SiO.sub.2 BiO.sub.3 glass system. The internal lubricant provides improved formability during the hot-working step, such as die-upsetting, and provides finished magnet products wherein the individual grains are more uniformly plastically deformed throughout the product.
REFERENCES:
patent: 4780226 (1988-10-01), Sheets et al.
Iwasaki Katsunori
Tanigawa Shigeho
Tokunaga Masaaki
Hitachi Metals Ltd.
Sheehan John P.
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