A kind of ni-co-mn-in alloy magnetic refrigeration material and preparation method thereof

Abstract

The invention provides a Ni-Co-Mn-In alloy magnetic refrigeration material and a preparation method thereof, belonging to the technical field of magnetic refrigeration materials. The present invention introduces Frankel defect pairs through electron irradiation on Ni-Co-Mn-In alloy, improves the total magnetic moment of the alloy through the joint action of Mn vacancies and Mn single atoms, and increases the saturation magnetization of austenite to achieve Increase the effect of the saturation magnetization difference before and after the phase transition, and then affect the magnetic properties of the alloy, greatly improve the magnetic entropy change of the alloy, and finally achieve the effect of improving the magnetocaloric effect of the alloy. The magnetic refrigeration material prepared by the present invention greatly improves the Ni- The magnetic properties of Co-Mn-In alloy, the obtained magnetic refrigeration material can reach the maximum magnetocaloric effect of 106.47J / kg·K under the magnetic field of 5T.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a Ni-Co-Mn-In alloy magnetic refrigeration material and a preparation method thereof. Background technique [0002] In contemporary society, refrigeration technology has penetrated into almost every field including petrochemical industry, cryogenic engineering, aerospace, medical equipment, high-energy physics, precision instruments and so on. The traditional refrigeration method adopts compressed vapor refrigeration, and refrigerants such as freon are mostly used, and freon is a "greenhouse effect" gas that will destroy the ozone layer in the atmosphere. Solid-state refrigeration is a new type of refrigeration proposed in recent years. It mainly uses the heat absorption and release of materials with solid-state phase transition during the phase transition process to achieve the purpose of refrigeration, mainly including elastothermic refrigeration and ma...

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Problems solved by technology

[0003] At present, the research on the magnetocaloric effect of alloys is mostly focused on the alloying and doping of Ni-Mn-X base (X=In, Sn, Sb). Although the magnetic entropy change value of the alloy can be partially improved, this modification means It is very limited and cannot meet the needs of practical applications. Moreover, due to the limited solid solubility of alloying element doping, the degree of performance improvement using this method is limited, and subsequent fatigue occurs.

In addition, the magnetic entropy change mainly comes from the two aspects of structural transformation and magnetic transformation in the process of phase transition, but there are few ways to improve these two aspects at the same time. Therefore, if certain means can be used to simultaneously increase the The structural difference and magnetic difference between the high and low temperature phases will inevitably increase the magnetic entropy change of the material.

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