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Manganese cobalt germanium-based alloy room temperature magnetic refrigeration material and preparation method thereof

A technology of magnetic refrigeration materials and base alloys, which is applied in the directions of magnetic materials, inorganic materials, magnetic objects, etc., to achieve the effects of easy realization, simple preparation method and excellent magnetic refrigeration performance.

Active Publication Date: 2020-08-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of 4d metal atoms Zr into MnCoGe-based alloys to achieve magnetic-structural phase transition coupling near room temperature to obtain excellent magnetocaloric properties has rarely been reported at room temperature.

Method used

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  • Manganese cobalt germanium-based alloy room temperature magnetic refrigeration material and preparation method thereof
  • Manganese cobalt germanium-based alloy room temperature magnetic refrigeration material and preparation method thereof
  • Manganese cobalt germanium-based alloy room temperature magnetic refrigeration material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Manganese sheet, zirconium sheet, cobalt block, germanium block according to Mn 0.96 Zr 0.04 The molar ratio of each element in the CoGe alloy is weighed and melted into an alloy ingot in a vacuum induction melting furnace.

[0026] (2) Put the smelted alloy ingot in a vacuum environment (vacuum degree ≤ 10 -2 Pa), annealed for 100 hours, and the annealing temperature was 1123K. After the annealing was completed, it was quenched with tap water to prepare the sample.

Embodiment 2

[0028] (1) Manganese sheet, zirconium sheet, cobalt block, germanium block according to Mn 0.95 Zr 0.05 The molar ratio of each element in the CoGe alloy is weighed and melted into an alloy ingot in a vacuum induction melting furnace.

[0029] (2) Put the smelted alloy ingot in a vacuum environment (vacuum degree ≤ 10 -2 Pa), annealed for 75 hours at an annealing temperature of 1273K, and quenched with tap water after annealing to prepare samples.

Embodiment 3

[0031] (1) Manganese sheet, zirconium sheet, cobalt block, germanium block according to Mn 0.94 Zr 0.06 The molar ratio of each element in the CoGe alloy is weighed and melted into an alloy ingot in a vacuum induction melting furnace.

[0032] (2) Put the smelted alloy ingot in a vacuum environment (vacuum degree ≤ 10 -2 Pa), annealed for 85 hours, the annealing temperature is 1173K, quenched with tap water after the annealing is completed, and the sample is prepared.

[0033] To the Mn that above-mentioned embodiment 1-3 makes 1-x Zr x CoGe ( x =0.04, 0.05, 0.06) alloys were analyzed by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), scanning electron microscope (SEM), X-ray energy spectrometer (EDS) and comprehensive physical property measurement system (PPMS) The crystal structure, phase transition thermodynamics, microscopic morphology, element distribution and magnetic properties were analyzed respectively.

[0034] figure 1 For the present inv...

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Abstract

The invention relates to a manganese cobalt germanium-based alloy room temperature magnetic refrigeration material and a preparation method thereof. The general chemical formula of the room temperature magnetic refrigeration material is Mn1-xZrxCoGe, wherein x is larger than or equal to 0.04 and is less than or equal to 0.06. The preparation method comprises the following steps of weighing manganese pieces, cobalt pieces and germanium blocks according to the molar ratio of each element in the general chemical formula, and smelting into alloy ingots; and annealing the smelted alloy ingots undervacuum condition (the vacuum degree is less than or equal to 10-2Pa) at the annealing temperature of 1123-1273K, preserving heat for 75-100 hours, and quenching to room temperature after heat preservation. The Mn atoms in MnCoGe mother alloy is replaced by Zr atoms, so that ferromagnetic phase transition and martensitic structure phase transition which are originally separated are coupled near room temperature, and the room temperature magnetic refrigeration material obtains an excellent magnetic thermal performance and is expected to be applied in the field of room temperature magnetic refrigeration.

Description

technical field [0001] The invention relates to a room-temperature magnetic refrigeration material, in particular to a manganese-cobalt-germanium-based alloy room-temperature magnetic refrigeration material and a preparation method thereof. Background technique [0002] Refrigeration technology plays a pivotal role in modern social life, from household refrigerators, air conditioners, and food freezers used in daily life to gas liquefaction and central air conditioning in industrial production. The commonly used refrigeration technology is the traditional vapor compression refrigeration, and the Freon refrigerant widely used in this technology has a great destructive effect on the atmospheric ozone layer. Although people have begun to use fluorine-free alternative refrigerants (such as ammonia, carbon dioxide, and halogenated substances of other light hydrocarbons), they still emit a large amount of greenhouse gases and pollute the environment. Another key problem of tradit...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/02H01F1/01
CPCC22C1/02C22C30/00C22C2202/02C22F1/02H01F1/015
Inventor 钱凤娇缪雪飞杨浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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