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A kind of preparation method of mnfepsi-based magnetic refrigeration composite material

A composite material and magnetic refrigeration technology, which is applied in refrigerators, refrigeration and liquefaction, and the operation mode of machines, etc., can solve the problems of poor mechanical properties and low thermal conductivity of MnFePSi-based magnetic refrigeration materials

Active Publication Date: 2021-05-04
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the prominent problems of poor mechanical properties and low thermal conductivity of MnFePSi-based magnetic refrigeration materials, the present invention proposes a preparation method of MnFePSi-based magnetic refrigeration composite materials, which adopts electroless copper plating and vacuum hot pressing to obtain high compressive strength, high thermal MnFePSi-Based Magnetic Refrigeration Composites with Conductivity and High Magnetic Entropy Change

Method used

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  • A kind of preparation method of mnfepsi-based magnetic refrigeration composite material
  • A kind of preparation method of mnfepsi-based magnetic refrigeration composite material
  • A kind of preparation method of mnfepsi-based magnetic refrigeration composite material

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Embodiment 1

[0025] mn 1.24 Fe 0.76 P 0.46 Si 0.54 The preparation process of / Cu magnetic refrigeration composite material:

[0026] 1) Screen out Mn with a particle size of 60-80 μm 1.24 Fe 0.76 P 0.46 Si 0.54 Particles, and then pickling pretreatment with hydrochloric acid alcohol solution;

[0027] 2) Suspend the pickled powder material in a mixed solution of 0.2mol / L copper sulfate and 0.02mol / L sodium citrate, the concentration of the powder material in the solution is 10g / L, dip-plating at room temperature for 90min After that, take it out, wash it with deionized water and alcohol and dry it;

[0028] 3) The material after electroless plating and drying was hot-pressed under vacuum at a hot-pressing temperature of 1000° C., a pressure of 500 MPa, and a hot-pressing time of 5 minutes to obtain a composite magnetic refrigeration material of φ4×10 mm.

[0029] The Mn obtained in this example 1.24 Fe 0.76 P 0.46 Si 0.54 XRD diffraction patterns of / Cu magnetic refrigeration...

Embodiment 2

[0035] Prepare Mn in the same way as in Example 1 1.24 Fe 0.76 P 0.46 Si 0.54 / Cu magnetic refrigeration composite material, in addition to changing the immersion plating time of electroless copper plating to 360min, changing the hot-pressing temperature to 1100°C, and changing the hot-pressing time to 1min.

[0036]By measuring the isothermal curves under different magnetic fields, it is calculated that the magnetic refrigeration composite material obtained in this embodiment has a magnetic entropy change of 11.4J / kgK when the external magnetic field changes to 2T; the thermal conductivity at room temperature measured by the laser thermal conductivity meter is 8.3W / kgK. mK; the compressive strength measured by the universal testing machine has reached 64MPa.

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Abstract

The invention discloses a method for preparing a MnFePSi-based magnetic refrigeration composite material, which belongs to the technical field of magnetic refrigeration materials. The steps include: screening MnFePSi-based magnetic refrigeration material powders with a particle size of 30-120 μm, and performing pickling pretreatment; The powder after the pickling pretreatment is suspended in a mixed solution of copper sulfate and sodium citrate at a certain concentration, and after dip-plating at room temperature for a period of time, it is taken out, cleaned and dried to obtain a core-shell MnFePSi / Cu composite powder material; The composite powder material is hot-pressed and molded under vacuum, the hot-pressing temperature is 950-1100° C., the hot-pressing pressure is 250-500 MPa, and the hot-pressing time is 1-5 minutes. The invention can obtain the MnFePSi / Cu composite magnetic refrigeration material with high thermal conductivity, high compressive strength and excellent magneto-caloric performance, which helps to promote the practical application of this type of magnetic refrigeration material.

Description

technical field [0001] The invention belongs to the technical field of magnetic refrigeration materials, and relates to a preparation method of an MnFePSi-based magnetic refrigeration composite material, in particular to a preparation method of a magnetic refrigeration composite material prepared by electroless copper plating and hot pressing. Background technique [0002] Modern society relies heavily on refrigeration technology. However, the commonly used refrigeration technology is mainly traditional gas compression refrigeration. There are two obvious disadvantages in this refrigeration technology: one is that the refrigeration efficiency is low, and the highest efficiency is only 25% of the Carnot cycle, and the other is that the refrigerant used has a great destructive effect on the atmosphere and causes the greenhouse effect. Therefore, it is particularly urgent to develop a new low-energy, high-efficiency, and pollution-free refrigeration technology. [0003] Among ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C22/00F25B21/00
CPCC22C1/04C22C22/00F25B21/00Y02B30/00
Inventor 缪雪飞胡述圆徐锋卢国文陈栋
Owner NANJING UNIV OF SCI & TECH
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