Metal treatment – Stock – Magnetic
Patent
1995-02-03
1995-09-12
Sheehan, John
Metal treatment
Stock
Magnetic
148302, 420 83, 420416, H01F 1053
Patent
active
054494168
ABSTRACT:
The extremely low temperature cold accumulating material for use in refrigerators, for example, comprises particles containing at least one kind of rare earth element selected from a group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. The proportion of particles each having a particle size of 0.01 to 3 mm is 70% or greater by weight with respect to the whole particles and the proportion of particles each having a shape such that the ratio of the major diameter to the minor diameter is not greater than 5 is 70% or greater by weight with respect to the whole particles. The particles are manufactured by quenching and solidifying a molten metal containing at least one kind of rear earth element described above. The thus manufacured extremely low temperature cold accumulating material is improved in cold accumulating efficiency and is specifically improved in mechanical strength and in chemical stability.
REFERENCES:
patent: 3558372 (1971-01-01), Becker
patent: 4354355 (1982-10-01), Lawless
patent: 4801340 (1989-01-01), Inoue et al.
patent: 4849017 (1989-07-01), Sahashi et al.
patent: 5162064 (1992-11-01), Kim et al.
"The Radio Wave" (a newspaper named Denpa Shimbun), Nov. 18, 1988.
Arai Tomohisa
Sahashi Masashi
Sori Naoyuki
Tokai Yoichi
Kabushiki Kaisha Toshiba
Sheehan John
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