IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0381009
(2002-02-12)
|
국제출원번호 |
PCT/JP02/01160
(2003-03-20)
|
국제공개번호 |
WO03/00931
(2003-01-30)
|
발명자
/ 주소 |
- Wada, Hirofumi
- Hirosawa, Satoshi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
38 인용 특허 :
6 |
초록
▼
A magnetic refrigerant material exhibits sufficiently great magnetocaloric effect at or near room temperature. The magnetic refrigerant material has an NiAs type hexagonal structure in a ferromagnetic phase. The magnetic refrigerant material includes a first element Mn, a second element As and a thi
A magnetic refrigerant material exhibits sufficiently great magnetocaloric effect at or near room temperature. The magnetic refrigerant material has an NiAs type hexagonal structure in a ferromagnetic phase. The magnetic refrigerant material includes a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibits a magnetic phase transition in a temperature range from about 230 K to less than about 318 K.
대표청구항
▼
1. A magnetic refrigerant material having an NiAs type hexagonal structure in a ferromagnetic phase, comprising a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibiting a magnetic phase transition in a temperature range from about
1. A magnetic refrigerant material having an NiAs type hexagonal structure in a ferromagnetic phase, comprising a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibiting a magnetic phase transition in a temperature range from about 230 K to less than about 318 K. 2. The material of claim 1, wherein the third element is Sb. 3. The material of claim 2, wherein the material is represented by the general formula MnAs 1−x Sb x (where 0<x≦0.25) and exhibits the magnetic phase transition into the ferromagnetic phase substantially without undergoing a structural transformation when a magnetic field is applied to the material in a paramagnetic phase. 4. The material of claim 3, wherein the material exhibits the magnetic phase transition on the application of a magnetic field of about 4 Tesla or less. 5. The material of claim 3, wherein x is equal to or greater than about 0.015. 6. The material of claim 3, wherein x is equal to or greater than about 0.05. 7. The material of claim 1, wherein the material includes a fourth element. 8. A regenerator comprising:first and second regenerative beds, each including a magnetic refrigerant material having an NiAs type hexagonal structure in a ferromagnetic phase, comprising a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibiting a magnetic phase transition in a temperature range from about 230 K to less than about 318 K; anda mechanism for applying mutually different magnetic fields to the first and second regenerative beds. 9. The regenerator of claim 8, wherein each of the first and second regenerative beds comprises a plurality of magnetic refrigerant materials that exhibit the magnetic phase transition at respectively different temperatures. 10. The regenerator of claim 9, wherein the magnetic refrigerant materials comprise multiple layers that are stacked one upon another. 11. The regenerator of claim 8, wherein each of the first and second regenerative beds comprises the magnetic refrigerant material and a binder, andwherein the binder is Al, Cu or Ti or a mixture or alloy that includes two or more elements selected from the group consisting of Al, Cu and Ti. 12. The regenerator of claim 8, wherein the mechanism for applying the magnetic fields comprises a magnetic circuit including a permanent magnet. 13. The regenerator of claim 12, wherein the magnetic circuit variably controls the strengths of the magnetic fields to be applied to the first and second regenerative beds. 14. The regenerator of claim 13, further comprising a mechanism for shuttling the first and second regenerative beds back and forth between a first position, which is inside the magnetic field created by the permanent magnet, and a second position, which is outside of the magnetic field, thereby applying the mutually different magnetic fields to the first and second regenerative beds. 15. A regenerator comprising:a magnetic circuit for variably controlling the strength of a magnetic field generated therefrom inside a cylindrical space; anda regenerative bed, which is disposed and fixed inside the cylindrical space and includes a magnetic refrigerant material having an NiAs type hexagonal structure in a ferromagnetic phase, comprising a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibiting a magnetic phase transition in a temperature range from about 230 K to less than about 318 K. 16. A magnetic refrigerator comprising:a regenerator including:first and second regenerative beds, each including a magnetic refrigerant material having an NiAs type hexagonal structure in a ferromagnetic phase, comprising a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibiting a magnetic phase transition in a temperature range from about 230 K to les s than about 318 K; anda mechanism for applying mutually different magnetic fields to the first and second regenerative beds; anda cold-side heat exchanger and a hot-side heat exchanger that are thermally coupled to the regenerator.
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