Metal treatment – Stock – Magnetic
Patent
1992-02-04
1993-12-14
Sheehan, John P.
Metal treatment
Stock
Magnetic
62 31, 62 6, 420416, H01F 104
Patent
active
052698548
ABSTRACT:
The present invention provides a regenerative material having a peak specific heat at a low temperature. The material is made of a solid solution of at least two different magnetic type metal compounds, for example, ferromagnetic Er.sub.3 Co and antiferromagnetic Er.sub.3 Ni. From these compounds, the regenerative material Er.sub.3 (Ni,Co) in solid-solution form is produced and the material has a lower magnetic phase transition point than each of the compounds. The regenerative material is utilized for a regenerator of a refrigerator.
REFERENCES:
patent: 4082138 (1978-04-01), Miedema et al.
patent: 4378258 (1983-03-01), Clark et al.
patent: 4849017 (1989-07-01), Sahashi et al.
patent: 5124215 (1992-06-01), Hashimoto
R. Li, et al., "Magnetic Intermetallic Compounds for Cryogenic Regenerator", Cryogenics, 6, 521-526, Jun. 30, 1990.
Hashimoto, et al., "Recent Advance In Magnetic Regenerator Material", Cryogenics, 30, 192-198, Sep. 30, 1990.
"Specific Heat and Entropy of RHi.sub.2 (R: Rare Earth Heavy Metals) In Magnetic Field" by A. Tomokiyo et al., vol. 32, pp. 295-301.
"High Enthalpy Materials For Use In Superconductor Stabilzation And In Low Temperature Cryocooler Regenerators" by B. Barbisch et al., vol. 32 pp. 271-278.
Sahashi Masashi
Takahashi Akiko
Tokai Yoichi
Kabushiki Kaisha Toshiba
Sheehan John P.
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