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, and belongs to the technical field of magnetic refrigeration materials. Electron irradiation is carried out on a Ni-Co-Mn-In alloy, a Frankel defect pair is introduced, the total magnetic moment of the alloy is improved through the combined action of a Mn vacancy and Mn elemental atoms, thesaturation magnetization of austenite is improved, the effect of increasing the saturation magnetization difference before and after phase transformation is achieved, the magnetic performance of thealloy is influenced, the magnetic entropy change of the alloy is greatly improved, and finally the effect of improving the magnetocaloric effect of the alloy is achieved. The prepared magnetic refrigeration material greatly improves the magnetic performance of the Ni-Co-Mn-In alloy, and the obtained magnetic refrigeration material can reach the maximum magnetocaloric effect of 106.47 J / kg.K undera 5T magnetic field.

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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