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Preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect

A technology of alloy powder and magnetocaloric effect, applied in metal processing equipment, transportation and packaging, surgery, etc., can solve the problem that it is difficult to obtain first-order phase transition characteristics and giant magnetocaloric effect, and the composition of iron-rhodium alloy powder is difficult to control and cannot be obtained directly Problems such as powdery samples, to achieve the effect of environmental friendliness, obvious first-order phase transition characteristics and magnetocaloric effect, and low cost

Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this method is that powdery samples cannot be obtained directly, and the size of the samples obtained by filing is not uniform, and external stress and other impurities (such as iron filings) are easily introduced during the filing process.
The liquid phase co-precipitation method is to use raw materials such as ferric chloride (or ferric nitrate, iron triacetylacetonate), rhodium chloride (or rhodium acetylacetonate), other metal halides, cetanediol, oleic acid, oleylamine, etc. It is dissolved in an organic solvent to make a solution, and then reduced at a high temperature to obtain iron-rhodium alloy powder; the reaction conditions of this method are mild and easy to control, but a large amount of various organic solutions are used, which causes serious environmental pollution, and the composition of the prepared iron-rhodium alloy powder Difficult to control, it is difficult to obtain obvious first-order phase transition characteristics and giant magnetocaloric effect

Method used

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  • Preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect
  • Preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect
  • Preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect

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Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect, is characterized in that, comprises the following steps:

[0027] Step 1. Weigh 0.0812g of ferric chloride hexahydrate, 0.1316g of rhodium trichloride trihydrate and 20g of sodium chloride into 50mL of deionized water, stir and mix evenly to obtain mixed solution A, wherein, The ratio of the amount of iron to rhodium trichloride trihydrate is 50:50; then, the mixed solution A is placed in a drying oven, and dried at 60° C. for 24 hours to evaporate the moisture in the sample;

[0028] Step 2, the product obtained after drying in step 1 is ground with an agate mortar to obtain iron rhodium-chloride salt precursor powder;

[0029] Step 3. Place the iron rhodium-chloride salt precursor powder obtained in step 2 in a sintering furnace, and first use a mechanical pump and hydrogen to pump and wash the sintering furnace 2 to 3 times to make the vacuum...

Embodiment 2

[0034] The difference between this embodiment and Example 1 is: the ratio of the amount of iron trichloride hexahydrate and rhodium trichloride trihydrate weighed in step 1 is 49:51; during step 5 high temperature vacuum annealing, the holding time Be 3h; All the other steps are identical with embodiment 1.

[0035] Figure 4For the X-ray diffraction spectrum and the magnetization variation curve of the iron-rhodium alloy powder that embodiment 2 makes; Sequence phase γ phase. The illustration shows the curves of magnetization versus temperature and magnetic entropy change versus temperature of the product prepared in this example. It can be seen from the figure that the temperature at which the first-order phase transition begins rises to 400 Kelvin, which is higher than that in Example 1. The product was prepared, and the maximum magnetization intensity was lower than that of the product prepared in Example 1, indicating that the reduction of the annealing time caused the ...

Embodiment 3

[0037] The difference between this embodiment and Example 1 is: the ratio of the amount of iron trichloride hexahydrate and rhodium trichloride trihydrate taken in step 1 is 48:52; during step 5 high-temperature vacuum annealing, the holding time Be 3h; All the other steps are identical with embodiment 1.

[0038] Figure 5 For the X-ray diffraction spectrum of the iron-rhodium alloy powder that embodiment 3 makes; The disordered phase γ phase of face-centered cubic structure in the X-ray diffraction spectrum is more obvious, shows that the structure of iron-rhodium alloy powder is very sensitive to the change of composition, rhodium The increase of elements will bring about a significant increase in the proportion of γ phase in the product.

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Abstract

The invention discloses a method for preparing iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect, and relates to a preparation method for micron and submicron iron-rhodium alloy powder. Concretely comprise the following steps: 1) take iron salt and rhodium salt as iron rhodium raw material, chloride salt as dispersion medium, add deionized water, mix uniformly, obtain mixed solution A; 2) mixed solution A is placed in drying oven and dried, The obtained product is ground to obtain iron rhodium-chloride salt precursor powder; 3) the iron-rhodium-chloride salt precursor powder is placed in a sintering furnace, and kept in a hydrogen atmosphere at 550-750°C for 2-3 hours; 4) the previous step is obtained The powder sample is placed in a vacuum tube furnace, and the vacuum degree is lower than 10 ‑3 Raise the temperature to 550-750°C under the condition of Pa, and keep it warm for 3-48 hours. The iron-rhodium alloy powder obtained by the invention can be used for directional drug release on the surface of artificial implants, has obvious first-order phase transition characteristics and magnetocaloric effect, and has stable and reliable performance.

Description

technical field [0001] The invention relates to a preparation method of micron and submicron iron-rhodium alloy powder, in particular to a preparation method of iron-rhodium alloy powder with first-order phase transition characteristics and magnetocaloric effect. Background technique [0002] Magnetic structure phase transition has brought a series of technological innovations, such as giant magnetoresistance effect, giant magnetocaloric effect and giant magnetostriction effect. Among these known magnetic structures, iron-rhodium alloys that are chemically ordered near equiatomic ratios have attracted great attention. It not only has a simple chemical phase composition and a highly symmetrical crystal structure, but also has a phase transition temperature near room temperature, which makes it easier for people to explore and research it in basic and applied aspects. [0003] For alloys such as gadolinium-silicon-germanium and lanthanum-iron-silicon with giant magnetocaloric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F1/00A61L31/08A61L31/14
CPCB22F9/22A61L31/088A61L31/14B22F1/142
Inventor 付浩曹余韬袁月商亚粉郑强胡俊山
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA