US 11,806,782 B2
Method for producing magnetic refrigeration material, and magnetic refrigeration material
Junya Fukuda, Echizen (JP); Tetsuya Kume, Echizen (JP); Koichi Hirota, Echizen (JP); and Hajime Nakamura, Echizen (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Filed on Feb. 23, 2023, as Appl. No. 18/173,140.
Claims priority of application No. 2022-048219 (JP), filed on Mar. 24, 2022.
Prior Publication US 2023/0302532 A1, Sep. 28, 2023
Int. Cl. H01F 1/04 (2006.01); B22F 1/00 (2022.01); B22F 9/02 (2006.01); B22F 9/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C21D 6/00 (2006.01)
CPC B22F 1/09 (2022.01) [B22F 9/023 (2013.01); B22F 9/04 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/00 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); H01F 1/04 (2013.01); B22F 2301/355 (2013.01); C22C 2202/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for producing a magnetic refrigeration material, comprising the steps of:
preparing a first magnetic refrigeration material which satisfies the following formula (1), and a second magnetic refrigeration material which differs from the first magnetic refrigeration material and satisfies the following formula (2); and
mixing the first magnetic refrigeration material and the second magnetic refrigeration material to obtain a third magnetic refrigeration material,
wherein the content (A1) of the first magnetic refrigeration material and the content (A2) of the second magnetic refrigeration material in the third magnetic refrigeration material per 100 parts by mass of the sum of the content (A1) and the content (A2) satisfy the following formulae (3) and (4):
−0.9≤(T1−T2)/W1≤0.9  (1)
−0.9≤(T1−T2)/W2≤0.9  (2)
((T2−TT)/(T2−T1))×100−20≤A1≤((T2−TT)/(T2−T1))×100+20  (3)
((T1−TT)/(T1−T2))×100−20≤A2≤((T1−TT)/(T1−T2))×100+20  (4)
where T1 represents the magnetic transition temperature (K) of the first magnetic refrigeration material, T2 represents the magnetic transition temperature (K) of the second magnetic refrigeration material, W1 represents the half width (K) of the peak of a curve showing the temperature dependence of the magnetic entropy change in the first magnetic refrigeration material, W2 represents the half width (K) of the peak of a curve showing the temperature dependence of the magnetic entropy change in the second magnetic refrigeration material, and TT represents a target magnetic transition temperature (K) of the third magnetic refrigeration material.