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Preparation method of high-performance room temperature magnetic cooling nano-bulk material

A magnetic refrigeration and nano-block technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., to achieve the effect of improving magnetocaloric performance, simple process, and overcoming component segregation

Inactive Publication Date: 2011-12-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research by Liu et al. showed that after the Co element replaced part of the Fe element, the T c increases to around room temperature, ΔS m Reduced, but still maintains a large room temperature magnetocaloric effect, and reduces hysteresis and thermal hysteresis losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Put 50 μm rare earth metal La element powder, 10 μm transition metal Fe element powder and 0.1 μm Si element powder into LaFe 11.38 Si 1.62 ingredient ratio;

[0022] 2) The prepared mixed powder is ball-milled with a high-energy ball mill under an argon protective atmosphere, the ball-to-material ratio is 10:1, the rotational speed is 400r / min, and the ball-milling time is 10h, so as to make it nano-sized and alloyed;

[0023] 3) The ball-milled powder is pressed into shape under argon protective atmosphere under a pressure of 115 MPa;

[0024] 4) Put the compact into a spark plasma sintering device for heating at a heating rate of 100°C / min. When heated to 900°C, vacuum sintering at a pressure of 30Mpa for 5min to obtain a magnetically cooled nano-block material.

[0025] Testing LaFe Using a Superconducting Quantum Magnetometer 11.38 Si 1.62 The isothermal magnetization curve near the Curie temperature can be obtained by calculating the magnetic entropy change...

Embodiment 2

[0027] 1) The rare earth metal La and Pr element powder of 28 μm, the transition metal Fe element powder of 45 μm and the Si element powder of 10 μm are pressed by La 0.5 PR 0.5 Fe 11.38 Si 1.62 ingredient ratio;

[0028] 2) The prepared mixed powder is ball-milled in a high-energy ball mill under vacuum, the ball-to-material ratio is 15:1, the rotating speed is 360r / min, and the ball-milling time is 8h, so as to make it nano-sized and alloyed;

[0029] 3) The ball-milled powder is pressed into shape under argon protective atmosphere under a pressure of 345 MPa;

[0030] 4) Put the compact into a spark plasma sintering device for heating at a heating rate of 50°C / min. When heated to 800°C, vacuum sinter at a pressure of 5Mpa for 20min to obtain a magnetically cooled nano-block material.

[0031] Using a superconducting quantum magnetometer to test La 0.5 PR 0.5 Fe 11.38 Si 1.62 The isothermal magnetization curve near the Curie temperature can be obtained by calculating...

Embodiment 3

[0033] 1) The 100 μm rare earth metal La element powder, the 65 μm transition metal Fe and Co element powder, and the 35 μm Si element powder are pressed by LaFe 10.95 co 0.5 Si 1.55 ingredient ratio;

[0034] 2) The prepared mixed powder is ball-milled with a high-energy ball mill under an argon protective atmosphere, the ball-to-material ratio is 18:1, the rotational speed is 330r / min, and the ball-milling time is 20h, so as to make it nano-sized and alloyed;

[0035] 3) The ball-milled powder is pressed into shape under a nitrogen protective atmosphere under a pressure of 200 MPa;

[0036] 4) Put the compact into a spark plasma sintering device for heating at a heating rate of 150°C / min. When heated to 700°C, vacuum sinter at a pressure of 20Mpa for 15min to obtain a magnetically cooled nano-block material.

[0037] Testing LaFe Using a Superconducting Quantum Magnetometer 10.95 co 0.5 Si 1.55 The isothermal magnetization curve near the Curie temperature can be obtain...

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Abstract

The invention discloses a preparation method of a high-performance room-temperature magnetic cooling nano-block material, and relates to the preparation technology of magnetic materials. The main steps are: 1) proportioning rare earth metal element powder, transition metal element powder, other metal element powder and silicon Si element powder in proportion; The ball mill is used for ball milling to make it nanometerized and alloyed; 3) The powder after ball milling is pressed into a protective atmosphere or vacuum; 4) The compact is placed in a spark plasma sintering device for vacuum sintering to form a magnet. The grain size of the bulk magnetic refrigeration material prepared by the invention is small and uniform, and the magnetocaloric performance is significantly improved. The process of the invention is simple, suitable for large-scale batch production, and high-performance room temperature magnetic refrigeration can be prepared. nano-bulk materials.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, in particular to a method for preparing a high-performance room-temperature magnetic cooling nano-block material. Background technique [0002] Magnetic refrigeration is realized through the magnetocaloric effect of materials, which has the characteristics of high efficiency, energy saving and environmental protection, and is a new type of green refrigeration technology. The magnetocaloric effect is an intrinsic property of materials, mainly through the isothermal magnetic entropy change (ΔS m ) and adiabatic temperature change (ΔT ad ) two indicators to evaluate. [0003] High-temperature magnetic refrigeration materials have broad application prospects in the temperature region near room temperature. La(Fe 1-x Si x ) 13 It is an important kind of high temperature magnetic refrigeration material, with NaZn 13 type cubic crystal structure, Curie temperature T c appro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16H01F1/047
Inventor 崔熙贵程晓农崔承云许晓静鲁金忠张朝阳管海兵钱晓明
Owner JIANGSU UNIV
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