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Preparation method of high-performance room temperature complex-phase magnetic cooling material

A magnetic refrigeration material and high-performance technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of limited magnetic refrigeration capacity, achieve low hysteresis loss, facilitate densification, and high magnetic entropy change Effect

Inactive Publication Date: 2012-08-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, soft magnetic amorphous alloys have lower ΔS m Its magnetic refrigeration capacity is relatively limited and cannot meet the needs of applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Amorphous Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 The alloy is prepared by the melt rapid quenching process, the rapid quenching speed is 45m / s, and the ball milling process is used to make powder after mechanical crushing, and the average particle diameter is 1μm;

[0025] 2) Crystalline LaFe 11.5 Si 1.5 The alloy is prepared by the quick-setting stripping process, the line speed of the copper roller is 2m / s, mechanically crushed after heat treatment, and then powdered by ball milling process, with an average particle diameter of 1μm;

[0026] 3) The amorphous Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 Alloy powder and crystal LaFe 11.5 Si 1.5 The alloy powder is uniformly mixed in a volume ratio of 9:1 under vacuum;

[0027] 4) The uniformly mixed powder is pressed into shape by a pressure of 300MPa under vacuum;

[0028] 5) The compact is sintered by spark plasma sintering process under vacuum to form amorphous Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 / Crystal LaFe 11.5 Si 1.5...

Embodiment 2

[0031] 1) Amorphous Fe56 co 7 Ni 7 Zr 8 Nb 2 Mo 5 B 15 The alloy is prepared by the melt rapid quenching process, the rapid quenching speed is 30m / s, after mechanical crushing, the ball milling process is used to make powder, and the average particle diameter is 20μm;

[0032] 2) Crystal Dy 0.9 Ho 0.1 co 2 The alloy is prepared by melting and casting process, mechanically crushed after heat treatment, and then powdered by ball milling process, with an average particle diameter of 20 μm;

[0033] 3) The amorphous Fe 56 co 7 Ni 7 Zr 8 Nb 2 Mo 5 B 15 Alloy powder and crystal Dy 0.9 Ho 0.1 co 2 The alloy powder is uniformly mixed in a volume ratio of 3:1 under an Ar protective atmosphere;

[0034] 4) The uniformly mixed powder is pressed into shape by a pressure of 200MPa under vacuum;

[0035] 5) The compact is sintered by spark plasma sintering process under vacuum to form amorphous Fe 56 co 7 Ni 7 Zr 8 Nb 2 Mo 5 B 15 / Crystal Dy 0.9 Ho 0.1 co 2 Fo...

Embodiment 3

[0038] 1) Amorphous Fe 75 Si 13 B 12 The alloy is prepared by the melt rapid quenching process, the rapid quenching speed is 35m / s, and the ball milling process is used to make powder after mechanical crushing, and the average particle diameter is 20μm;

[0039] 2) Crystalline Gd 5 Si 2 Ge 2 The alloy is prepared by melt rapid quenching process, the rapid quenching speed is 25m / s, mechanically crushed after heat treatment, and then powdered by ball milling process, with an average particle diameter of 1 μm;

[0040] 3) The amorphous Fe 75 Si 13 B 12 Alloy powder and crystal Gd 5 Si 2 Ge 2 The alloy powder is uniformly mixed in a volume ratio of 1:1 under an Ar protective atmosphere;

[0041] 4) The uniformly mixed powder is pressed into shape by a pressure of 100 MPa under an Ar protective atmosphere;

[0042] 5) The compact is sintered by spark plasma sintering process under vacuum to form amorphous Fe 75 Si 13 B 12 / Crystal Gd 5 Si 2 Ge 2 For the multi-phas...

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Abstract

The invention relates to a preparation method of a high-performance room temperature complex-phase magnetic cooling material. The complex-phase magnetic cooling material comprises amorphous ferrous alloy and crystalline rare earth based alloy. The preparation method comprises the following steps of: (1) preparing the amorphous ferrous alloy by adopting a melt-spun process, mechanically crushing and then carrying out ball milling to prepare powder; (2) preparing the crystalline rare earth based alloy by adopting an ingot casting process, a fast-hardening and strip-casting process or a melt-spun process, mechanically crushing after heat treatment, and then carrying out ball milling to prepare powder; or preparing alloy powder by directly adopting a mechanical alloying process; (3) evenly mixing the amorphous ferrous alloy powder and the crystalline rare earth based alloy powder in the protection atmosphere or vacuum; (4) carrying out compression molding on mixed powder in the protectionatmosphere or vacuum; and (5) preparing a pressed blank into amorphous / crystalline complex-phase blocky alloy by adopting a rapid sintering process below the crystallization temperature and in the protection atmosphere or vacuum. The prepared complex-phase magnetic cooling material has high magneto-thermal performance, high decay resistance performance, low hysteresis lag and cost and simple process, and is suitable for large-scale batch production.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a preparation method of a high-performance room temperature multi-phase magnetic refrigeration material. Background technique [0002] Refrigeration technology is widely used in various fields of aerospace, medical equipment, precision instruments, petrochemical industry and daily life. At present, the most commonly used refrigeration technology is gas compression expansion, which is not only inefficient, but also seriously pollutes the environment. Magnetic refrigeration technology uses the magnetocaloric effect of materials to achieve refrigeration. It has the characteristics of high efficiency, energy saving and green environmental protection. It is a new type of green refrigeration technology. [0003] Divided from the application temperature range, magnetic refrigeration materials include three types: low temperature (<20K), medium temperature (20-77K) and high temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/153
Inventor 崔熙贵程晓农崔承云许晓静张朝阳鲁金忠钱小明管海兵
Owner JIANGSU UNIV
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