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Novel magnetic refrigerant materials

A magnetic refrigeration and magnetic heating technology, applied in the direction of magnetic materials, inorganic materials, heat exchange materials, etc.

Inactive Publication Date: 2015-08-12
HAIER US APPLIANCE SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other MCMs can only undergo magnetocaloric effects at temperatures unsuitable for refrigeration, air conditioning, and / or other applications requiring heating and / or cooling

Method used

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  • Novel magnetic refrigerant materials
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Experimental program
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example

[0096] Three kinds of Ni having the atomic composition ratio specified in this specification were induction-melted under Ar atmosphere 50 mn 50-x In x-y Si y alloy. Two ingots cast in two batches have the same Ni 50 mn 35 In 14 Si composition, while the third ingot has Ni 51 mn 33.4 In 15.6 Element. Samples processed from as-cast ingots were subsequently heat-treated in two steps in a flowing Ar furnace.

[0097] In the first step, the sample is annealed at a temperature of about 800°C to about 900°C for 4 hours to 24 hours. After the first annealing step, the samples were quenched to room temperature (about 20° C.) in a water bath. In a second step, the sample was annealed at a temperature of about 500°C to about 700°C for 48 hours to 72 hours, and then quenched again in a water bath to room temperature.

[0098] Martensite and austenite were determined based on magnetization and temperature data collected with respect to an applied magnetic field of 10 mTesla usi...

example 1

[0100] Ni at various temperatures and durations 50 mn 35 In 14 Si alloy (Ni 50 mn 35 In 14 Si-sample PV-9582) was heat treated. The martensitic transformation temperature, or MPTT, of this as-cast billet was 261K. By changing the heat treatment parameters, the transformation temperature of the alloy can be adjusted between about 261K and about 268.5K, as shown in Table 1 and Figure 4 shown.

[0101] Table 1.Ni 50 mn 35 In 14 Si alloy (Ni 50 mn 35 In 14 Martensitic transformation temperature and heat treatment parameters in Si-batch 1).

[0102]

example 2

[0104] Ni at various temperatures and durations 50 mn 35 In 14 Si alloy (Ni 50 mn 35 In 14 Si-sample SA01) was heat treated. The martensitic transformation temperature of this as-cast ingot is 265K. By changing the heat treatment parameters, the transformation temperature of the alloy can be adjusted between about 265K and about 271.5K, as shown in Table 2 and Figure 5 shown.

[0105] Table 2.Ni 50 mn 35 In 14 Si alloy (Ni 50 mn 35 In 14 Martensitic transformation temperature and heat treatment parameters in Si-batch 2).

[0106]

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Abstract

A novel magneto caloric material (MCM) is provided that can be used in, for example, a regenerator of a heat pump, appliance, air conditioning system, and other heating and / or cooling devices. The MCM is a type of Heusler alloy, has an L21 crystal structural prototype, and can undergo a reversible phase transformation between a low temperature, low magnetization Martensite phase and a high temperature, high magnetization Austenite phase to exhibit an inverse magneto caloric effect upon application of a sufficient magnetic field. A process of annealing of the alloy is also provided that can be used to adjust the temperature at which this phase transformation occurs. The present invention includes the alloy as subjected to such annealing.

Description

technical field [0001] The present invention generally relates to a magnetic cryogen material, also known as a magnetocaloric material. Background technique [0002] Traditional refrigeration technologies typically use heat pumps that rely on compressing and expanding a fluid refrigerant to receive and reject heat in a cyclical fashion to provide the desired temperature change, or that is, to move thermal energy from one location to another. For example, this cycle could be used to receive heat from a cold room and discharge this heat to the environment or to a location outside the cold room. Other applications include air conditioning of residential or commercial structures. A variety of different fluid refrigerants have been developed in the art that can be used with heat pumps in such systems. [0003] Although various improvements have been made to this type of heat pump system that relies on compressing a fluid refrigerant, such systems can only operate at best at or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/00C22C45/04C22F1/16F25B21/00H01F1/01H01F1/04
CPCC09K5/00Y02B30/66H01F1/015F25D11/00F25B21/00C22C45/006C22F1/16C22C45/04Y02B30/00
Inventor F.约翰逊M.邹殷明R.R.阿哈拉普拉普C.克拉珀V.K.斯里瓦斯塔瓦
Owner HAIER US APPLIANCE SOLUTIONS INC