Platinum-cobalt alloy permanent magnets of enhanced coercivity

Details Platinum-cobalt alloy permanent magnets of enhanced coercivity Platinum-cobalt alloy permanent magnets of enhanced coercivity

1989-04-11

1991-01-08

Sheehan, John P.

Metal treatment

Stock

Magnetic

148430, 420466, H01F 1047

Patent

active

049832301

ABSTRACT:
The coercivity of magnetic alloys formed from platinum, cobalt, and boron is enhanced by incorporating from 12 to 14 percent of boron together with amounts of platinum and cobalt such that the ratio of platinum to cobalt is from 0.90 to 1.2. The magnetic alloy is formed by rapid solidification of a homogeneous melt, and the solidified casting is heat treated to improve microstructure and increase coercivity.

REFERENCES:
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patent: 4764435 (1988-08-01), Hosizaki et al.
Becker et al., IEEE Transactions on Magnetics, (1984), MAG-20, 5:1596-1598.
Anderson et al., Materials Research Soc. Proceedings, (1987), 80:449-456.
Livingston, Proc. 8th Intl. Workshop on Rare Earth Magnets, ed. K. J. Strnat, (1985), pp. 423-440.
Katada and Shimizu, J. Appl. Physics, (1983), 54(12):7089-7094.
Vanderbilt University Center for the Space Processing of Engineering Materials, Nashville, Tenn., Annual Report of Oct. 1, 1985 to Oct. 31, 1986, pp. 30-38.

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