Preparation method of carbonic rare earth-ferrum, cobalt and silicon compound with NaZn1 structure

A technology of iron-cobalt-silicon and compound, which is applied in the field of preparation of carbon-containing rare earth-iron-cobalt-silicon compound, which can solve the problems of uneven composition, fast cooling speed, difficulty in obtaining bulk materials, etc., and achieve shortened annealing time and stable performance reliable effect

Inactive Publication Date: 2010-06-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing problems are, firstly, it is difficult to obtain large blocks of materials larger than 2mm after quenching, and the quenching speed is too fast, and the thin strips or particles obtained are very brittle, and then after subsequent annealing and sometimes necessary hydrogenation After the project, a large part of it is pulverized into a powder of the order of magnitude less than 0.1mm, which cannot be used
However, the preparation meth

Method used

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  • Preparation method of carbonic rare earth-ferrum, cobalt and silicon compound with NaZn1 structure
  • Preparation method of carbonic rare earth-ferrum, cobalt and silicon compound with NaZn1 structure
  • Preparation method of carbonic rare earth-ferrum, cobalt and silicon compound with NaZn1 structure

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Experimental program
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Effect test

Embodiment 1

[0052] Raw materials with the same composition as Comparative Example 1 are distributed according to the chemical composition, the rare earth metal is added in excess of 10% atomic percentage, and the Si element is added in excess of 1% atomic percentage; put it into a vacuum induction furnace and evacuate to 2×10 -1 Above Pa, argon gas with a pressure of -0.05MPa is introduced, the melting temperature is controlled at 150°C above the melting point, and the melting time is controlled at 15 minutes. In the 30mm cylindrical mold, a master alloy with uniform composition was obtained. The metallographic diagram of the master alloy is shown in Figure 4 , composed of dendrites, the backscattering pattern of the sample is shown in Figure 5 , it can be known that the dendrite is α-Fe phase, and the interdendrite is non-NaZn 13 The rare earth-containing phase of the structure, no 1:13 phase is formed. The compound obtained by smelting was annealed at 1080°C for 2 days, and then di...

Embodiment 2

[0058] Raw materials such as La, Pr, Fe, Si, Co, C, etc. are classified according to chemical composition La 0.6 PR 0.4 Fe1 0.8 co 0.7 Si 1.5 C0.3 Ratio, the rare earth metal La is added in excess of 10% atomic percentage, the rare earth metal Pr is excessively added in 5% atomic percentage, and the Si element is added in excess of 1% atomic percentage; put it into a vacuum induction furnace and evacuate to 2×10 -1 Above Pa, argon gas with a pressure of -0.05MPa is introduced, the melting temperature is controlled at 200°C above the melting point, and the melting time is controlled at 10 minutes. The distance between the inner walls was 5 mm, resulting in a homogeneous compound. The compound obtained after smelting was annealed at 1100°C for 2 days, and then directly put into ice water for rapid quenching. Using SQUID to measure the change of magnetization curve with temperature, such as Figure 9 shown. The magnetization curve of this material is devoid of hysteresis a...

Embodiment 3

[0061] La, Fe, Si, Co, C and other raw materials are classified according to chemical composition La 0.9 Ce 0.1 Fe 10.7 co 0.9 Si 1.4 C 0.4 Ratio, the rare earth metal La is added in excess of 10% atomic percentage, the rare earth metal Ce is added in excess of 7% atomic percentage, and the Si element is added in excess of 1% atomic percentage; put it into a vacuum induction furnace and evacuate to 2×10 -1 Above Pa, argon gas with a pressure of -0.02MPa is introduced, the melting temperature is controlled at 200°C above the melting point, and the melting time is controlled at 10 minutes. After melting, it is poured into a copper cylindrical mold with a diameter of 20mm and a wall thickness of 5mm. , to obtain a homogeneous compound. The compound obtained by smelting was annealed at 1080° C. for 3 hours, 6 hours, 12 hours, and 2 days in sequence, and then directly put into ice water for rapid quenching. The metallographic photos of the samples obtained at each annealing t...

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Abstract

The invention provides a preparation method of carbonic rare earth-ferrum, cobalt and silicon compound with NaZn1 structure, belonging to the technical field of magnetic refrigeration material; in the invention, a vacuum induction furnace is adopted for smelting, vacuumizing is carried out to above 2*10-1Pa, the pressure of common argon is from -0.05MPa to -0.02MPa, the smelting temperature is more than from 50 DEG C to 200 DEG C than the melting point, the smelting time is from 3-20min; the material is poured into a casting mould with red copper material to obtain mother alloy after being smelted, annealing treatment is carried out to the smelted mother alloy, so as to prepare the carbonic rare earth-ferrum, cobalt and silicon compound with 0.1-0.4 of C atom content alpha. The method can prepare the carbonic rare earth-ferrum, cobalt and silicon compound with more than 3mm of bulk mass, the annealing time is greatly shortened, and the obtained carbonic rare earth-ferrum, cobalt and silicon compound belongs to second-order phase transition without heat stagnation and magnetism stagnation, the performance is stable and reliable, Curie temperature can be regulated to more than room temperature, and the carbonic rare earth-ferrum, cobalt and silicon compound is applied to the magnetic cooling air-conditioning technology and wide magnetic refrigeration technology.

Description

technical field [0001] The invention belongs to the technical field of magnetic refrigeration materials, and in particular provides a method for preparing a simple carbon-containing rare earth-iron-cobalt-silicon compound. Background technique [0002] In recent years, since magnetic refrigeration technology is considered to be one of the next-generation new refrigeration technologies that are environmentally friendly, efficient and energy-saving, the exploration and research of magnetic refrigeration materials with huge magnetic entropy change has attracted great attention. Especially with NaZn 13 The rare earth-iron-cobalt-silicon compound of phase is recognized as the most practical magnetic refrigeration material due to its low price of raw materials and large change of magnetic entropy. However, NaZn is directly formed from the rare earth-iron-cobalt-silicon melt 13 The 1:13 phase of the type structure is very difficult. Under normal solidification conditions, the 1:1...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C1/02B22F9/08C21D6/00H01F1/053F25B21/00
CPCY02B30/66Y02B30/00
Inventor 龙毅鲍博王超伦叶荣昌常永勤
Owner UNIV OF SCI & TECH BEIJING
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