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Method for in-situ preparation of carbon coated nickel-particle doped MgB2 superconductive material

A technology of carbon-coated nickel and in-situ preparation, applied in the field of superconductivity, to achieve the effect of uniform distribution of nanoparticles, simple method, and high critical current density

Inactive Publication Date: 2009-11-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method opens a new chapter in in-situ doping, but people's research is still in its preliminary stage and needs to be continuously explored

Method used

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  • Method for in-situ preparation of carbon coated nickel-particle doped MgB2 superconductive material
  • Method for in-situ preparation of carbon coated nickel-particle doped MgB2 superconductive material
  • Method for in-situ preparation of carbon coated nickel-particle doped MgB2 superconductive material

Examples

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Embodiment 1

[0022] An in-situ preparation of carbon-coated nickel particles doped with MgB 2 The method of superconducting material, is made up of following steps: with MgB 2 :Ni Weigh MgB in a ratio of 4:1 by weight 2 powder and Ni(NO 3 ) 2 ·6H 2 O powder is the raw material, pour the weighed powder into a large beaker, and pour distilled water 50 times the weight of the raw material at the same time, put the beaker in a magnetic stirrer to stir, and titrate with NaOH solution, the reaction that occurs during this process for:

[0023] Ni(NO 3 ) 2 ·6H 2 O+2NaOH=Ni(OH) 2 (precipitation)+2NaNO 3 ;

[0024] After titration, place the beaker at room temperature for precipitation for 5 hours, separate the precipitate from the aqueous solution, pour out the remaining aqueous solution, and remove the precipitated substance MgB 2 and Ni(OH) 2 Dry in a drying oven to remove excess moisture, then put the precipitate into a tube furnace, and calcinate at 400°C for 2 hours under the prot...

Embodiment 2

[0030] An in-situ preparation of carbon-coated nickel particles doped with MgB 2 The method of superconducting material, is made up of following steps: with MgB 2 :Ni Weigh MgB at a weight ratio of 19:1 2 powder and Ni(NO 3 ) 2 ·6H 2 O powder is the raw material, pour the weighed powder into a large beaker, and pour distilled water 50 times the weight of the raw material at the same time, place the beaker on a magnetic stirrer, and titrate with KOH solution (other alkalis can also be used) After the titration, place the beaker at room temperature for precipitation for 3 hours, separate the precipitate from the aqueous solution, pour out the remaining aqueous solution, dry the precipitate in a drying oven to remove excess water, and then put it into the tube In the furnace, under the protection of nitrogen, it was calcined at 400 ° C for 2 hours and then lowered to room temperature, and then the calcined material was passed into H in a tube furnace. 2 , the flow rate is 10...

Embodiment 3

[0032] An in-situ preparation of carbon-coated nickel particles doped with MgB 2 The method of superconducting material, is made up of following steps: with MgB 2 :Ni Weigh MgB in a ratio of 4:1 by weight 2 powder and Ni(NO 3 ) 2 ·6H 2 O powder is the raw material, pour the weighed powder into the container, and pour distilled water equivalent to 40 times the weight of the raw material at the same time, stir, and titrate with NaOH solution. After the titration, put the container at room temperature to settle for 12 hours. , to 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 the precipitated material into a tube furnace, and calcinate at 400°C for 2 hours and then cool down to room temperature under the protection of nitrogen. , and then the calcined substance was passed into H in a tube furnace 2 , the flow rate is 15L / min, then heat up to 500°C and hold for 1h, t...

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Abstract

The invention discloses a method for in-situ preparation of carbon-coated nickel particle-doped MgB2 superconducting material, which is characterized by the following steps: weighing MgB2 and Ni(NO3)2·6H2O, add distilled water, stir, titrate with NaOH solution, precipitate at room temperature for 3 to 12 hours, dry the precipitate, put it in a tube furnace, calcinate under the protection of argon, and then pass in H2 , heat up to 500-700°C, keep warm for 1-3h, pass CH4 gas, keep warm for 2h, and cool to room temperature. The carbon prepared by the method of the present invention is coated around the nickel balls and evenly mixed into the inside of the MgB2 matrix. The obtained sample composition It is stable, not easy to form agglomerates, and has obvious morphological characteristics. While introducing C particles, Ni nanophases are also introduced in situ. This kind of particles can be used as effective magnetic flux pinning centers, which is beneficial to the increase of critical current density.

Description

technical field [0001] The invention belongs to the technical field of superconductivity, and relates to an in-situ carbon doping enhanced MgB 2 Composite methods. Background technique [0002] In 2001, Japanese scientist J.Nagamatsu and others discovered a new type of superconducting material with a critical transition temperature of 39K—magnesium diboride (MgB 2 ) (J.Nagamatsu et al.Nature 410(2001)63), its superconducting transition temperature is the highest so far among simple intermetallic compounds, which has aroused great interest. 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 high-angle grain boundary can also pass the current (A.Gurevichet 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.Lett.79(2001)230), therefore, can withstand higher critical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
Inventor 刘永长赵倩赵乃勤康建立马宗青史庆志
Owner TIANJIN UNIV
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