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122 type iron-based superconductor and preparation method thereof

An iron-based superconductor and iron powder technology, applied in the field of superconductors, can solve the problems of uniformity, contradicting high efficiency, uneven distribution, and harm.

Pending Publication Date: 2021-12-31
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, the current preparation method of BaK122-type iron-based superconductors only starts sintering after mixing the raw materials by ball milling. In the BaK122-type iron-based superconductors prepared in this way, there will be insufficient reaction and uneven distribution of iron elements. The iron elements participating in the phase formation will lead to the incompleteness of the main phase and the reduction of the proportion of the superconducting phase, which will lead to the deterioration of the superconducting current transmission performance and the uniformity of the current distribution of the BaK122 superconductor, which is required for the uniformity and high efficiency of practical applications. On the contrary, a potentially harmful

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  • 122 type iron-based superconductor and preparation method thereof
  • 122 type iron-based superconductor and preparation method thereof
  • 122 type iron-based superconductor and preparation method thereof

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preparation example Construction

[0027] The invention provides a preparation method of a 122-type iron-based superconductor, wherein the chemical formula of the 122-type iron-based superconductor is Ba 0.6 K 0.4 Fe 2 As 2 , including the following steps:

[0028] The iron element and the first arsenic element are mixed, and the first ball milling and the first sintering are performed in sequence to obtain Fe 2 As embryo;

[0029] the Fe 2 As embryo body, barium element, potassium element and second arsenic element are mixed, and the second ball milling, pressing and second sintering are performed in sequence to obtain the Ba 0.6 K 0.4 Fe 2 As 2 .

[0030] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0031] In the present invention, the iron element and the arsenic element are mixed, and the first ball milling and the first sintering are performed in sequence to obtain Fe 2 As embryo body.

[...

Embodiment 1

[0048] 1. Under the protection of an inert atmosphere, Fe powder (purity 99.5%, particle size ~10μm) and crushed As powder (purity 99.5%, particle size ~100μm) are uniformly mixed at a molar ratio of 2:1.08, sealed into Mill in a 250mL ball mill tank at a speed of 500r / min for 2 hours, a total of three times, and the tank needs to be opened under the protection of an inert atmosphere in the middle to prevent uneven ball milling.

[0049] 2. After ball milling, place the Fe+As mixture in an Al 2 o 3 In the crucible, the outside is covered with a stainless steel tube for protection, and the two ends of the stainless steel tube are welded in an argon atmosphere.

[0050] 3. Put the sealed stainless steel tube into the muffle furnace for sintering, raise the temperature to 700°C at a rate of 6K / min for 24 hours, and then cool in the furnace to obtain Fe with uniform phase formation, less impurities and higher density. 2 As embryo body.

[0051] 4. The prepared Fe 2 As embryo b...

Embodiment 2

[0077] 1. Under the protection of inert atmosphere, Fe powder (purity of 99.5%, particle size of ~10μm) and crushed As powder (purity of 99.5%, particle size of ~100μm) were uniformly mixed in a molar ratio of 2:1.08, and sealed into a In a 250mL ball milling jar, the ball was milled at a speed of 400r / min for 2 hours, a total of 3 times, and the jar should be opened under the protection of an inert atmosphere in the middle to prevent uneven ball milling.

[0078] 2. After the ball milling is completed, Fe 2 The As mixture is placed in an Al 2 O 3 In the crucible, the outside is covered with a stainless steel tube for protection, and both ends of the stainless steel tube are welded and sealed in an argon atmosphere.

[0079] 3. Put the sealed stainless steel tube into a muffle furnace for sintering, heat it up to 720 °C at a rate of 6K / min and keep it for 12 hours, and then cool it in the furnace to obtain Fe with uniform phase, less impurities and higher density. 2 As embr...

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Abstract

The invention belongs to the technical field of superconductors, and provides a 122 type iron-based superconductor and a preparation method thereof. According to the preparation method provided by the invention, the 122 type iron-based superconductor is Ba0. 6K0. 4Fe2As2, and the preparation method comprises the following steps: mixing an iron elementary substance and a first arsenic elementary substance, and sequentially carrying out first ball milling and first sintering to obtain a Fe2As blank; and mixing the Fe2As blank, a barium elementary substance, a potassium elementary substance and a second arsenic elementary substance, and sequentially carrying out second ball milling, pressing and second sintering to obtain Ba0.6K0.4Fe2As2. Before the Ba0. 6K0. 4Fe2As2 main phase is formed, the iron element with a high melting point and low chemical activity and a component element arsenic form chemical bonds to form a pre-reacted Fe2As intermediate product, so that iron particles are refined, the iron component is purified, the distribution uniformity of the iron component in a final superconductor is greatly improved, and the practical performance of the iron-based superconducting wire strip is further improved.

Description

technical field [0001] The invention relates to the technical field of superconductors, in particular to a 122-type iron-based superconductor and a preparation method thereof. Background technique [0002] BaK122 iron-based superconductor Ba 0.6 K 0.4 Fe 2 As 2 It is a new type of superconductor with high practical potential, which has the advantages of high transition temperature, high upper critical field and small anisotropy. In recent years, superconducting wire tape has developed rapidly, and the demand for its large-scale practical application is increasing day by day. However, the current preparation method of BaK122 iron-based superconductor only starts sintering after ball-milling and mixing the raw materials. The BaK122 iron-based superconductor prepared in this way will have the phenomenon of insufficient reaction and uneven distribution of iron. The iron element participating in the phase formation will lead to the problem that the main phase is incomplete a...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/622C04B35/626C04B35/64H01B13/00
CPCC04B35/515C04B35/622C04B35/62675C04B35/64H01B13/0036C04B2235/405C04B2235/42C04B2235/40C04B2235/602C04B2235/5436C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658
Inventor 涂畅董持衡
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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