Title:
【発明の名称】蓄冷材料の製造方法
Document Type and Number:
Japanese Patent JP2585240
Kind Code:
B2
Abstract:
PURPOSE:To obtain a magnetic polycrystalline substance having superior magneto-caloric effect in a low-temp. region of the temp. of liquid nitrogen or below, by subjecting the microcrystalline grains of a magnetic intermetallic compound consisting of one or more kinds among La-series elements and one or more kinds among the elements of groups IIIa, IVa, etc., to high-pressure molding and then to heat treatment in a specific temp. range. CONSTITUTION:The microcrystalline grains of a magnetic intermetallic compound consisting of one or more elements among Y, La, Ce, or Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb and one or more elements among B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Cu, etc., are molded under high pressure. It is desirable that this high-pressure molding is carried out by extra-high pressure pressing of 100,000atm. or above or impact pressure molding. Moreover, it is desirable that the grain size of the above microcrystalline grains is regulated to 0.1-1,000mum. Subsequently, the above high-pressure molded body is subjected to heat treatment at a temp. between 0.6XTM and TM kelvin based on the melting temp. TM of the above intermetallic compound, so that desired magnetic polycrystalline substance can be obtained.
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Inventors:
SAHASHI MASASHI
NIBU HIROMI
TOKAI YOICHI
INOMATA KOICHIRO
NIBU HIROMI
TOKAI YOICHI
INOMATA KOICHIRO
Application Number:
JP826687A
Publication Date:
February 26, 1997
Filing Date:
January 19, 1987
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
C22C1/04; B22F3/08; C22F1/00; F25B21/00; (IPC1-7): C22F1/00; C22C1/04; F25B21/00
Domestic Patent References:
| JP61183436A | ||||
| JP6230840A |
Attorney, Agent or Firm:
Hideaki Tokawa (1 outside)