Method for preparing metallic nickel nano granule doped MgB2 superconduction material by reduction method

A nanoparticle and superconducting material technology, applied in the field of superconductivity, can solve the problems of expensive metal nanoparticles, difficult nanoparticle doping, and reduced doping effect, so as to achieve critical current density, not easy to agglomerate, doping Mixed effect obvious effect

Inactive Publication Date: 2009-06-10
TIANJIN UNIV
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Problems solved by technology

However, the doping of nano-metal particles is still a difficult problem to solve, because on the one hand, most metals are relatively active and easy to oxidize, so it is difficult to mix high-purity nanoparticles into the original powder, and between the nanoparticles due to van der Waals Force often causes agglomeration, which tends to greatly reduce the doping effect; on the other hand, metal nanoparticles are quite expensive

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  • Method for preparing metallic nickel nano granule doped MgB2 superconduction material by reduction method
  • Method for preparing metallic nickel nano granule doped MgB2 superconduction material by reduction method
  • Method for preparing metallic nickel nano granule doped MgB2 superconduction material by reduction method

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Embodiment 1

[0028] An in-situ preparation of nickel nanoparticles doped MgB 2 The method for superconducting material is made up of following steps: (1) takes by weighing respectively the amorphous boron powder (purity 99%) of 1.5 gram and the Ni (NO of 0.832 gram) 3 ) 2 ·6H 2O powder, then the powder is poured into the container, while pouring into distilled water equivalent to 50 times the weight of the raw material, the beaker is placed on a magnetic stirrer to stir, and titrated with NaOH solution, the reaction that occurs in this process is:

[0029] Ni(NO 3 ) 2 ·6H 2 O+2NaOH=Ni(OH) 2 (precipitation)+2NaNO 3 ;

[0030] After the titration, the beaker was placed at room temperature to precipitate for 3 hours, the precipitate was separated from the aqueous solution, the remaining aqueous solution was poured out, and the precipitated substance B and Ni(OH) 2 Dry in a desiccator to remove excess moisture,

[0031] (2) Put the dried powder into a tube furnace and calcinate at 300...

Embodiment 2

[0036] An in-situ preparation of carbon-coated nickel particles doped with MgB 2 The method for superconducting material is made up of the following steps: first the prepared raw material is pressed by Mg 0.95 Ni 0.05 B 2 Weigh magnesium powder (purity 99.5%), amorphous boron powder (purity 99%) and Ni(NO 3 ) 2 ·6H 2 O powder. Secondly, B powder and Ni(NO 3 ) 2 ·6H 2 Pour the O powder into a large beaker after weighing, and pour distilled water equivalent to 50 times the weight of the raw material at the same time, place the beaker in a magnetic stirrer to stir, and titrate with NaOH solution. After the titration, place the beaker at room temperature to precipitate 7 After one hour, separate the precipitate from the aqueous solution, pour out the remaining aqueous solution, dry the precipitate in a drying oven to remove excess water, put it in a tube furnace, and calcinate at 500°C for 3 hours under the protection of argon, and then Raise the temperature to 600°C and ...

Embodiment 3

[0038] An in-situ preparation of carbon-coated nickel particles doped with MgB 2 The method for superconducting material is made up of the following steps: first the prepared raw material is pressed by Mg 0.94 Ni 0.06 B 2 Weigh magnesium powder (purity 99.5%), amorphous boron powder (purity 99%) and Ni(NO 3 ) 2 ·6H 2 O powder. Secondly, B powder and Ni(NO 3 ) 2 ·6H 2 O powder is weighed and poured into a container, and at the same time, pour distilled water equivalent to 50 times the weight of the raw material, stir the beaker in a magnetic stirrer, and titrate with NaOH solution. After the titration, place the beaker at room temperature to precipitate 12 Hours later, separate the precipitate from the aqueous solution, pour out the remaining aqueous solution, dry the precipitate in a drying oven to remove excess water, put it in a tube furnace, and calcinate at 600°C for 5 hours under the protection of argon and then heat up to 700°C, pass H into the tube furnace 2 T...

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Abstract

The invention relates to a method for preparing a metal nickel nano-particle doped MgB2 superconducting material by a reduction method. Firstly, Ni(OH)2-B precursor powder is prepared, Ni(NO3)2.6H2O powder and B powder are fully mixed and stirred in distilled water, and a NaOH solution is used to titrate; and secondly, a precipitate is dried to remove water in a vacuum drying oven; the dried Ni(OH)2-B precursor powder is placed into a tubular furnace to be calcined under the protection of nitrogen or argon to ensure that Ni(OH)2 is decomposed to obtain NiO-B mixed powder; H2 is introduced after the temperature rise, and the flow makes NiO fully reduced to obtain the Ni-B mixed powder; and a mixed tablet of Mg power and Ni-B powder which meets the atomic ratio that Mg : B is equal to 1-1.5: 2 is weighed in a differential thermal analyzer (DTA), is sintered for 30 to 60 minutes at a temperature of between 650 and 850 DEG C, and then is cooled to room temperature. The average diameter of nickel particles prepared by the method is 5 nanometers, the nickel particles are evenly distributed inside a B matrix, and an obtained test sample has steady components, is difficult to form the agglomeration, and has apparent morphological feature. Compared with other metallic dopants, the material has the advantages of simple preparation method, low cost, apparent doping effect and so on.

Description

technical field [0001] The invention belongs to the technical field of superconductivity, and relates to a reduction method for preparing metallic nickel nanoparticles doped with MgB 2 approach to superconducting materials. Background technique [0002] Magnesium diboride (MgB 2 ) has a high superconducting transition temperature and simple chemical composition (J.Nagamatsu et al.Nature 410(2001)63), and has received great attention in recent years. Compared with high-temperature superconducting materials, MgB 2 The superconducting properties of the grain boundary are not affected by the weak connection, that is, the large-angle grain boundary can also pass the current (A.Gurevich et al.Supercond Sci Technol 17(2004) 278; S.X.Dou et al.J Appl Phys 96(2004 )7549; Y.Zhao et al.Appl Phy Lett 79(2001)1154; G.Grasso et al.Appl Phy Lett79(2001)230), therefore, can withstand higher critical current density (J c ). But MgB 2 The irreversible magnetic field of the superconducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04H01B12/00
Inventor 刘永长赵倩马宗青赵乃勤康建立余黎明
Owner TIANJIN UNIV
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