Fe-Pt-Nb permanent magnet with an ultra-high coercive force and

Details Fe-Pt-Nb permanent magnet with an ultra-high coercive force and Fe-Pt-Nb permanent magnet with an ultra-high coercive force and

1988-03-22

1989-03-21

Sheehan, John P.

Metal treatment

Stock

Magnetic

148430, 420466, H01F 104

Patent

active

048140279

ABSTRACT:
The disclosed permanent magnet has a coercive force of larger than 500 Oe, a residual magnetic flux density of larger than 5 kG, and a maximum energy product of larger than 2 MGOe, and it consisting essentially of 48.about.66.9 Atm % of iron, 33.about.47 Atm % of platinum, and 0.1.about.10 Atm % of niobium. It includes a crystal structure of an incomplete single .gamma..sub.1 phase of a face-centered tetragonal system due to either the composition thereof or heat treatment applied thereto. The permanent magnet is made by heating an alloy of the above main composition at 900.degree..about.400.degree. for one minute to ten hours and quenching the alloy at a high speed of faster than 30.degree. C./minute but slower than 2,000.degree. C./sec.

REFERENCES:
patent: 3444012 (1969-05-01), Shimizu et al.
patent: 4396441 (1983-08-01), Masumoto et al.
"A New Heat-Treatment of Pt--Co Alloys of High-Grade Magnetic Properties", y H. Kaneko et al., vol. 9, 1968, pp. 124-129.
"Constitution of Binary Alloys Fe--Pt", pp. 698-700, 1958.

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