High corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material and preparation method thereof

A magnetocaloric material, high corrosion resistance technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as difficulty in coating and damage, and achieve the effects of uniform C content, cost saving, and strong corrosion resistance.

Inactive Publication Date: 2013-04-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, corrosion inhibitors are generally alkaline, which will damage other parts of the refrigerator to some extent, and the size of the rare earth-iron-cobalt-silicon compound used as a refrigerant in the refrigerator is mostly less than 1mm, which brings difficulties to the coating.

Method used

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  • High corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material and preparation method thereof
  • High corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material and preparation method thereof
  • High corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] La, Fe, Si, Cr, C and other raw materials are formulated into LaFe according to their chemical composition 11.3 Cr 0.2 Si 1.5 C 0.12 and LaFeSi, then according to the volume ratio of 0.97 (LaFe 11.3 Cr 0.2 Si 1.5 C 0.12 ): 0.3 (LaFeSi) to prepare three kilograms of 1# corrosion-resistant magnetocaloric material, and at the same time, according to the chemical composition, make it into the comparison sample LaFe 10.87 co 0.63 Si 1.5 、LaFe 11.4 Si 1.5 C 0.12 Three kilograms are put into a vacuum induction furnace for smelting, and after smelting, pour it into a cylindrical mold with a diameter of 50mm, a wall thickness of 3mm, and a bottom thickness of 30mm to obtain an ingot with uniform composition. The ingot was annealed at 1080°C for 3 days, and then directly put into ice water for quick quenching. figure 1 It shows the X-ray diffraction pattern of the 1# corrosion-resistant magnetocaloric material of the present invention, wherein the abscissa is the dif...

Embodiment 2

[0038] Pure La mixed with industrial pure mixed rare earths Re (La / Re: 28.27 wt.%, Ce / Re: 50.46 wt.%, Pr / Re: 5.55 wt.%, Nd / Re: 15.66 wt.%)), Fe, Si, Cr, C raw materials respectively according to chemical composition La 0.8 (Ce, Pr, Nd) 0.2 Fe 11.25 mn 0.1 Cr 0.3 Si 1.5 C 0.2 and LaFeSi preparation, and then according to the volume ratio of 0.98 (LaFe 11.3 Cr 0.2 Si 1.5 C 0.12 ): 0.2 (LaFeSi) ratio to form 2# corrosion-resistant magneto-caloric material, melted in a vacuum induction furnace to obtain an ingot, and then annealed the ingot at 1100 ° C for 2 days, directly put it into ice water for quick quenching, and obtained A compound of uniform composition. Figure 6 Represents the X-ray diffraction pattern of 2# corrosion-resistant magnetocaloric material, where the abscissa is the diffraction angle, and the ordinate is the diffraction intensity. From Figure 6 It can be seen that, with the assistance of LaFeSi, the 2# corrosion-resistant magnetocaloric material ...

Embodiment 3

[0040] La, Fe, Si, Cr, Mn, C and other raw materials are formulated into LaFe according to their chemical composition 11.1 mn 0.1 Cr 0.3 Si 1.5 C 0.15 and LaFeSi, then according to the volume ratio of 0.99 (LaFe 11.1 mn 0.1 Cr 0.3 Si 1.5 C 0.15 ): The ratio of 0.1 (LaFeSi) is formulated into 3# corrosion-resistant magneto-caloric material, which is put into an atomizing ball-forming device for melting and then quenched into balls to obtain small balls of 0.5-1mm. The pellets were annealed at 1080°C for 1 day, and then directly quenched in ice water. image 3 The polarization curves of the 3# corrosion-resistant magnetocaloric pellets of the present invention and the materials in Example 1 are shown. From image 3 It can be seen that the corrosion current density of the 3# corrosion-resistant magnetocaloric material of the present invention is lower than that of the comparison material LaFe 10.87 co 0.63 Si 1.5 、LaFe 11.4 Si 1.5 C 0.12 , while the corrosion pote...

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Abstract

The invention belongs to the technical field of magnetic refrigeration materials, and provides a high corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material, which comprises part of chromium atoms substituting for iron atoms as well as carbon atoms as interstitial atoms. After the high corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material is soaked in tap water of 25 DEG C for 12 hours, the corrosion rate is less than 0.2g/m<2>.h. The high corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material has two chemical molecular formulas, one is La1-xRx(Fe1-y-mCryMm)13-zSizCa, and the other is LaFeSi. The corrosion rate of the high corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric material is less than half that of ordinary rare earth-iron silicon magnetocaloric material; and the high corrosion resistance rare earth-iron chromium silicon carbon magnetocaloric cast ingot has high magnetic entropy change value after short-time annealing, thus being used in magnetic refrigeration technology as a practical material.

Description

Technical field [0001] The invention is a magnetic refrigeration material technology field, which provides a rare earth-iron chromium silicon carbon compound with strong corrosion resistance, especially the rare earth-iron chromium silicon carbon compounds and their preparation of a corrosion-resistant NAZN13 structure. Background technique [0002] In recent years, because of magnetic cooling technology, it is considered a green environmental protection, high -efficiency and energy -saving next -generation new refrigeration technology. The exploration and research of magnetic refrigeration materials with giant magnetic entropy changes has attracted great attention.Especially with Nazn 13 The rare earth-iron cobalt-silicon compound, due to the low price of raw materials and a large change in magnetic entropy, is recognized as the most practical prospective magnetic cold material.Many articles and patents have been reported to Nazn 13 The rare earth-iron cobalt silicon compound.Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C33/04C21D1/26C09K5/14
Inventor 龙毅张敏付松胡杰叶荣昌常永勤
Owner UNIV OF SCI & TECH BEIJING
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