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Ni-Co-Mn-Sn magnetic refrigeration material and preparation method thereof

A ni-co-mn-sn, magnetic refrigeration material technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of limited practical application, pulverization, low Curie temperature, etc., to improve the working range And magnetocaloric properties, increase the saturation magnetization, the effect of smooth magnetic entropy curve

Active Publication Date: 2018-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when working, the reciprocating cycle of the first-order phase change material near the magnetic phase transition temperature (that is, the Curie temperature of the alloy) causes the regular change of "expansion-shrinkage-expansion-shrinkage..." in the lattice volume of the material, many times After circulation, it will inevitably lead to the pulverization of the material, which seriously restricts its application in magnetic refrigerators
At the same time, the smelted bulk alloy needs to be annealed at high temperature for seven days or even longer, and the energy consumption is astonishing. Moreover, due to the high brittleness of the bulk alloy, it is difficult to carry out subsequent processing, which seriously limits the practical application.
[0004] In recent years, the research in the field of magnetic refrigeration has gradually turned to secondary phase change materials. Ni-Mn-Sn alloy materials have become a research hotspot due to their good magnetocaloric properties and low cost. However, due to the ternary Ni-Mn-Sn The Curie temperature of the alloy is lower than room temperature, which limits the temperature range of the application of this type of material

Method used

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  • Ni-Co-Mn-Sn magnetic refrigeration material and preparation method thereof
  • Ni-Co-Mn-Sn magnetic refrigeration material and preparation method thereof
  • Ni-Co-Mn-Sn magnetic refrigeration material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] Step 1: Ni, Mn, Sn are weighed and mixed according to the molar ratio of elements Ni:Mn:Sn=43:46:11, and Mn is added with a balance of 1.5% of its mass;

[0042] Step 2: Put the raw materials configured in step 1 into the vacuum electric arc furnace, and vacuumize to 10 -3 Pa, after cleaning the furnace with high-purity argon, fill it with 0.04MPa high-purity argon, and repeat the melting for 5 times under the protection of high-purity argon to obtain a button-shaped alloy ingot with uniform composition.

[0043] Step 3: After simple mechanical crushing of the alloy ingot prepared in Step 2, put it into a quartz nozzle, fix the quartz tube in the induction coil, and evacuate to 10 -4 Pa, after cleaning the furnace with high-purity argon, fill it with high-purity argon with a pressure difference of 0.08MPa, and perform single-roll melt rapid quenching under its protection, and the tangential linear speed of the copper roll is 20m / s.

[0044] Step 4: Seal the strip sample ...

Embodiment 2

[0049] Step 1: Ni, Mn, Co, Sn are weighed and mixed according to the molar ratio of elements Ni: Co: Mn: Sn = 42:1:46:11, and Mn is added with a balance of 1.5% of its mass;

[0050] Step 2: Put the raw materials configured in step 1 into the vacuum electric arc furnace, and vacuumize to 10 -3 Pa, after cleaning the furnace with high-purity argon, fill it with 0.04MPa high-purity argon, and repeat the melting for 5 times under the protection of high-purity argon to obtain a button-shaped alloy ingot with uniform composition.

[0051] Step 3: After simple mechanical crushing of the alloy ingot prepared in Step 2, put it into a quartz nozzle, fix the quartz tube in the induction coil, and evacuate to 10 -4 Pa, after cleaning the furnace with high-purity argon, fill it with high-purity argon with a pressure difference of 0.08MPa, and perform single-roll melt rapid quenching under its protection, and the tangential linear speed of the copper roll is 20m / s.

[0052] Step 4: Seal t...

Embodiment 3

[0057] Step 1: Ni, Mn, Co, Sn are weighed and mixed according to the molar ratio of elements Ni: Co: Mn: Sn = 41:2:46:11, and Mn is added with a balance of 1.5% of its mass;

[0058] Step 2: Put the raw materials configured in step 1 into the vacuum electric arc furnace, and vacuumize to 10 -3 Pa, after cleaning the furnace with high-purity argon, fill it with 0.04MPa high-purity argon, and repeat the melting for 5 times under the protection of high-purity argon to obtain a button-shaped alloy ingot with uniform composition.

[0059] Step 3: After simple mechanical crushing of the alloy ingot prepared in Step 2, put it into a quartz nozzle, fix the quartz tube in the induction coil, and evacuate to 10 -4 Pa, after cleaning the furnace with high-purity argon, fill it with high-purity argon with a pressure difference of 0.08MPa, and perform single-roll melt rapid quenching under its protection, and the tangential linear speed of the copper roll is 20m / s.

[0060] Step 4: Seal t...

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Abstract

The invention discloses a Ni-Co-Mn-Sn magnetic refrigeration material and a preparation method of the Ni-Co-Mn-Sn magnetic refrigeration material. The chemical formula of the material is Ni43-xCoxMn46Sn11, wherein x is larger than or equal to 0 and is smaller than or equal to 3. The method comprises the following steps that 1, metal raw materials are weighed in proportion, and Mn with the certainmargin is added; 2, the mixed raw materials are repeatedly molten under argon protection, and an alloy cast ingot with uniform ingredients is obtained; and 3, the alloy is subjected to solution rapidquenching under argon protection, and the Ni-Co-Mn-Sn magnetic refrigeration material is obtained. By adding the Co element into an alloy thin belt, the saturation magnetization of austenite and the Curie temperature of alloy are improved, and the alloy belt material has the good thermomagnetic property at the room temperature. The material shows second-order phase change in the magnetization process, heat stagnation and magnetic stagnation are almost avoided, the preparation process is simple, the cost is low, and the material is suitable for industrial production and practical application.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a Ni-Co-Mn-Sn magnetic refrigeration material and a preparation method thereof. Background technique [0002] With the growing global energy crisis and the deteriorating environment, the traditional gas compression refrigeration technology is facing unprecedented challenges. According to statistics, the energy consumption of the refrigeration industry accounts for more than 15% of the total energy consumption of the whole society. People pay attention to the new refrigeration technology. is also increasing rapidly. The current refrigeration technologies mainly include gas compression refrigeration, magnetic refrigeration, liquid vaporization refrigeration and thermoelectric refrigeration. Compared with the traditional gas compression refrigeration technology, the magnetic refrigeration technology uses solid magnetic materials as the working medium and realizes refrigeration by ...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C22/00C22C1/02C22F1/16B22D11/06H01F1/01
CPCB22D11/001B22D11/06C22C1/02C22C22/00C22C30/00C22F1/16H01F1/015
Inventor 曾德长曾伟奇郑志刚余红雅
Owner SOUTH CHINA UNIV OF TECH
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