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A flexible mnniti-based magnetic phase change alloy material and its preparation method, control method and application

An alloy material, magnetic phase change technology, applied in the fields of magnetic materials, refrigeration and liquefaction, inorganic material magnetism, etc., can solve the problems of poor practical feasibility and uncontrollable changes in magnetic properties, and achieve enhanced magnetocaloric effect, enhanced magnetization, and improved operation. simple effect

Active Publication Date: 2022-03-01
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a flexible MnNiTi-based magnetic phase change alloy with low-field anisotropy magnetocaloric effect in order to overcome the problems of uncontrollable change of magnetism and poor practical feasibility in the existing magnetic phase change material element doping control mode Material

Method used

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  • A flexible mnniti-based magnetic phase change alloy material and its preparation method, control method and application
  • A flexible mnniti-based magnetic phase change alloy material and its preparation method, control method and application
  • A flexible mnniti-based magnetic phase change alloy material and its preparation method, control method and application

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Experimental program
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Effect test

Embodiment 1

[0058] (1) Ingredients: According to the chemical formula Mn 50 Ni 31.5 co 8.5 Ti 10 The ratio in the formula is to weigh high-purity raw materials Ni, Mn, Co, Ti, and carefully polish off the oxide layer on the surface of the required transition metal elements before mixing.

[0059] Taking Mn element as an example, it needs to be cleaned and smelted before ingredients to ensure the purity of raw materials. The specific steps are as follows:

[0060] 1) Put a certain amount of Mn elemental substance in the beaker, and then pour a dilute hydrochloric acid solution diluted with water with a volume ratio of about 1:1 to make a chemical reaction, and stir it quickly with a glass rod during the reaction;

[0061] 2) When the oxide disappears and the Mn surface shows a bright metallic luster, quickly pour out the waste solution after the reaction in the beaker:

[0062] 3) Rinse the reacted metal Mn with deionized water, rinse twice and then rinse twice with industrial alcohol;...

Embodiment 2

[0077] The difference between embodiment 2 and embodiment 1 is that the chemical formula of the flexible MnNiTi-based magnetic phase change alloy material (phase change ribbon material) is: Mn 50 Ni 28 co 10 Ti 12 , step (4) is different, and the rest of the process is exactly the same.

[0078] Step (4): Fully dissolve polyethylene glycol (PEG) and water at a mass ratio of 1:7; magnetically stir the prepared solution at a heating temperature of 50°C for 3 hours to obtain a PEG sol; Mn 50 Ni 28 co 10 Ti 12 Thin strips were placed on glass slides, and were spin-coated with PVA for 90s by a homogenizer. During the spin coating process, the speed of the homogenizer was 1000 r / min, so that Mn 50 Ni 28 co 10 Ti 12 The thin tape was completely adhered to the upper surface of the glass slide; the composite thin tape obtained after spin coating was dried at a heating temperature of 60°C and the drying time was 5 min to obtain a composite thin tape; then polydimethyl The sil...

Embodiment 3

[0080] The difference between embodiment 3 and embodiment 1 is that the chemical formula of the flexible MnNiTi-based magnetic phase change alloy material is: Mn 50 Ni 33 co 8 Ti 9 , step (4) is different, and the rest of the process is exactly the same.

[0081] Step (4): Fully dissolve polyethylene glycol (PEG) and water at a mass ratio of 1:8; magnetically stir the prepared solution at a heating temperature of 60°C for 2.5 hours to obtain a PEG sol; Mn 50 Ni 33 co 8 Ti 9 Thin strips were placed on glass slides, and were spin-coated with PVA for 90s by a homogenizer. During the spin coating process, the speed of the homogenizer was 1000 r / min, so that Mn 50 Ni 33 co 8 Ti 9 The thin tape was completely adhered to the upper surface of the glass slide; the composite thin tape obtained after spin coating was dried at a heating temperature of 70°C and the drying time was 3 min to obtain a composite thin tape; then the polyethylene naphthalate The glycol ester (PEN) sub...

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Abstract

The invention relates to the technical field of magnetic phase change alloy materials, and provides a flexible MnNiTi-based magnetic phase change alloy in order to solve the problems that the existing magnetic phase change material element doping regulation method cannot control the change of magnetism and the practical effect is poor. Material and its preparation method, control method and application, the chemical formula of the flexible MnNiTi-based magnetic phase change alloy material is Mn 50 Ni 50‑a‑b co b Ti a , where 9≤a≤12, 8≤b≤10. The flexible MnNiTi-based magnetic phase change alloy material of the present invention is obtained by doping Co elements into the MnNiTi-based Heusler alloy system, and the obtained alloy can exhibit a large magnetic entropy change effect at room temperature; the control method is based on bending and rotation, Effective control of the magnetic anisotropy of the flexible MnNiTi-based magnetic phase change alloy material is conducive to obtaining a larger rotational magnetocaloric effect, which enhances both the magnetization and the magnetocaloric effect, and obtains a strain-adjustable spinner effect.

Description

technical field [0001] The invention relates to the technical field of magnetic phase change alloy materials, in particular to a flexible MnNiTi-based magnetic phase change alloy material and its preparation method, control method and application. Background technique [0002] The ability of magnetic phase change materials to exhibit a large magnetocaloric effect near room temperature is the key to realizing effective magnetic refrigeration. The core of magnetocaloric effect material refrigeration is a magnetic phase change material that relies on various characteristics. It can absorb heat from the cold end of the cooling object and transport the heat to the hot end, and then reciprocate under the pressure, electric field or magnetic field. The heat is released to the environment, so as to achieve the cooling effect. Unlike the Freon volatile liquid refrigerant refrigeration used in refrigerators and air conditioners, the refrigeration cycle based on magnetocaloric materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C22/00C22C1/02C22F1/16F25B21/00H01F1/01
CPCC22C22/00C22C1/02C22F1/16H01F1/015F25B21/00Y02B30/00
Inventor 赵晓宇闫亚新温嘉红李勇李领伟
Owner HANGZHOU DIANZI UNIV
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