Preparation method iron based SmFeAsO1-xFx superconducting wire

A smfeaso1-xfx, superconducting wire technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problem of low preparation success rate, small sealing and restraint effect, poor material performance, etc problems, to achieve the effect of high preparation success rate, improved critical current density and good performance

Inactive Publication Date: 2009-01-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Press the raw materials into sheets and wrap them with tantalum sheets, seal them in a vacuum quartz tube for high-temperature sintering, and wrap them with tantalum sheets to have little sealing and restraining effect on the raw materials, making the prepared superconducting materials loose and poor in material performance
At the same time, during the sintering process, the volatilized fluorine will corrode the quartz tube and cause the quartz tube to break, making the success rate of sample preparation low

Method used

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  • Preparation method iron based SmFeAsO1-xFx superconducting wire
  • Preparation method iron based SmFeAsO1-xFx superconducting wire
  • Preparation method iron based SmFeAsO1-xFx superconducting wire

Examples

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Embodiment 1

[0022] An iron-based SmFeAsO 1-x f x The preparation method of superconducting wire rod, its operation step is: a, prepare material according to prepare iron-based superconducting material SmFeAsO 1-x f x , the stoichiometric ratio of x=0.2, weigh the raw materials SmAs, Fe, Fe respectively 2 o 3 , FeF 3 , after grinding and mixing evenly, put the tantalum tube into it, fill it up, press it tightly, and seal both ends of the tantalum tube, and welding can be used for sealing; Then draw it into a wire rod with a diameter of 2mm; c. Sintering Place the wire rod in a quartz tube for vacuum sealing, put it in a sintering furnace, and raise the temperature to 1150°C at a rate of 100°C / hour under an inert protective atmosphere, and keep it warm for 48 hours. Then cool with the furnace to get SmFeAsO 0.8 f 0.2 superconducting wire.

[0023] figure 1 For the SmFeAsO prepared by the method of this example 0.8 f 0.2 Scanning electron microscope (SEM) image of a superconductin...

Embodiment 2

[0025] A specific embodiment of the present invention is: an iron-based SmFeAsO 1-x f x The preparation method of superconducting wire rod, its operation step is: a, prepare material according to prepare iron-based superconducting material SmFeAsO 1-x f x , the stoichiometric ratio of x=0.15, weigh raw material SmAs, Fe, Fe respectively 2 o 3 , FeF 3 , after grinding and mixing evenly, put it into the tantalum tube, fill it up, press it tightly, and seal both ends of the tantalum tube; Wire; c. Sintering Put the wire in a quartz tube and vacuum seal it, put it into a sintering furnace, and raise the temperature to 1170°C at a rate of 150°C / hour under an inert protective atmosphere, keep it warm for 36 hours, and then cool with the furnace to obtain SmFeAsO 0.85 f 0.15 superconducting wire.

Embodiment 3

[0027] An iron-based SmFeAsO 1-x f x The preparation method of superconducting wire rod, its operation step is: a, prepare material according to prepare iron-based superconducting material SmFeAsO 1-x f x , the stoichiometric ratio of x=0.2, weigh the raw materials SmAs, Fe, Fe respectively 2 o 3 , FeF 3 , after grinding and mixing evenly, put it into the tantalum tube, fill it up, press it tightly, and seal both ends of the tantalum tube; Wire; c. Sintering Put the wire in a quartz tube and vacuum seal it, put it into a sintering furnace, and raise the temperature to 1170°C at a rate of 120°C / hour under an inert protective atmosphere, keep it warm for 40 hours, and then cool with the furnace to obtain SmFeAsO 0.8 f 0.2 superconducting wire.

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Abstract

The invention provides a preparation method of an iron-based SmFeAsO<1-x>Fx superconducting wire, comprising the steps as follows: a: material preparation: the material is prepared according to the stoichiometry of the iron-based superconducting material SmFeAsO<1-x>Fx (wherein, x is not more than 0.35 and not less than 0.15, the raw materials such as SmAs, Fe, Fe2O3 and FeF3 are weighed, grinded, uniformly mixed, arranged into a Tantalum pipe, fully fixed and compacted; the two ends of the Tantalum pipe are sealed; b: wire preparation: the Tantalum pipe is sheathed into a copper pipe and rotatablely forged; subsequently, the wire with the diameter of 1.8-2.2mm is formed by pulling and drawing; c: burning: the wire is arranged in a quartz pipe and sealed in vacuum and then put into a sintering furnace; under the protection of inert gas, the temperature of the wire is increased to 1150-1170 DEG C at the speed of 100-150 DEG C/hour, the temperature is kept for 36-50 hours and the wire is cooled with the furnace. The method of the invention has the advantages of simple technology and facilitating industrial production, and the compactness, high purification, stable superconducting performance, high superconducting conversion temperature and high critical magnetic field of the prepared iron-based SmFeAsO<1-x>Fx superconducting wire.

Description

technical field [0001] The invention relates to an iron-based SmFeAsO 1-x f x Preparation method of superconducting material, especially a kind of iron-based SmFeAsO 1-x f x Preparation method of superconducting wire. Background technique [0002] In early 2008, Japanese and Chinese scientists successively reported the discovery of a new class of high-temperature superconducting materials—iron-based superconducting materials, which aroused widespread concern in the scientific community. Japanese scientists first discovered that La[O 1-x f x ] FeAs compounds have superconducting properties at a critical temperature of 26 Kelvin ("Journal of the American Chemical Society" volume 130, p. 3296). Subsequently, the research team led by Chen Xianhui from the University of Science and Technology of China discovered that SmFeAsO 0.85 f 0.15 The compound also becomes a superconductor at a critical temperature of 43 Kelvin ("Nature" volume 453, p. 761). When the fluorine doping...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/00H01B13/00
CPCY02E40/64Y02E40/60
Inventor 陈永亮崔雅静赵勇张勇程翠华
Owner SOUTHWEST JIAOTONG UNIV
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