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Method for increasing sintering efficiency of FeSe superconducting material

A technology of superconducting material and efficiency, applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problem of slow sintering of FeSe superconducting materials, achieve good intergranular connectivity, improve efficiency, and improve the uniformity of the structure. Effect

Inactive Publication Date: 2014-03-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of relatively slow sintering of FeSe superconducting materials, and to provide a method that can be used to improve the sintering efficiency of FeSe superconducting materials

Method used

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  • Method for increasing sintering efficiency of FeSe superconducting material
  • Method for increasing sintering efficiency of FeSe superconducting material
  • Method for increasing sintering efficiency of FeSe superconducting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select Fe powder (purity is 99.99%) and Se powder (purity is 99.99%), mix according to atomic weight ratio 1: 0.95, then put the mixed powder into polyurethane ball milling tank, put into the ball milling tank with a diameter of 6mm stainless steel Steel balls, the mass ratio of ball powder is 20:1; filled with 0.15MPa argon, put it into a ball mill, and conduct ball milling under the protection of inert gas argon for 50h; then make thin slices under a pressure of 2MPa for 10 minutes. In the XRD spectrum, it can be seen that the diffraction peak of Se in the treated powder sample nearly disappears, and the diffraction peak of Fe shifts, indicating that Se has entered the lattice of Fe to form a solid solution, and the direct contact area between Se and Fe is larger.

Embodiment 2

[0035]Select Fe powder (purity is 99.99%) and Se powder (purity is 99.99%), mix according to the atomic weight ratio 1:1, then put the mixed powder into the polyurethane ball mill jar, and put the stainless steel with a diameter of 6mm in the ball mill jar Steel balls, the mass ratio of ball powder is 15:1; after filling with 0.1MPa argon gas, put it into the ball mill, and carry out ball milling under the protection of inert gas argon for 20h; then hold the pressure at 6MPa for 6 minutes to make thin slices, Put the slice into a high-temperature differential scanner, and conduct differential thermal analysis under an argon protective atmosphere with a flowing pressure of 0.06MPa. The heating rate is 5°C / min. After rising to 600°C, cool at a cooling rate of 20°C. Bring to room temperature. Compared with the untreated powder, the two reaction peaks move to the low temperature direction, the reaction advances, the reaction interval becomes smaller, and the reaction becomes more ...

Embodiment 3

[0037] Select Fe powder (purity is 99.99%) and Se powder (purity is 99.99%), mix according to atomic weight ratio 1: 0.95, then put the mixed powder into polyurethane ball milling tank, put into the ball milling tank with a diameter of 6mm stainless steel Steel balls, the mass ratio of ball powder is 10:1; after filling with 0.15MPa argon gas, put it into the ball mill, and conduct ball milling under the protection of inert gas argon for 50h; then keep the pressure at 0.05MPa for 2 minutes to make thin slices , put the slice into a high-temperature differential scanner, and conduct differential thermal analysis under an argon protective atmosphere with a flowing pressure of 0.07MPa. The heating rate is 5°C / min. After rising to 600°C, the cooling rate is 10°C Cool down to room temperature. It can be seen from the DSC curve that the two reaction exothermic peaks have been separated, one has been advanced before the melting of Se, indicating that the reaction has already occurred...

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Abstract

The invention relates to a method for increasing the sintering efficiency of a FeSe superconducting material. The method comprises the following steps of: mixing Fe powder with Se powder in the atomic ratio of 1:0.95-1:1.05, putting into a polyurethane ball milling tank, putting a stainless steel ball which is 6 millimeters in diameter into the ball milling tank, vacuumizing, charging argon gas of 0.05-0.15 MPa, putting into a ball mill, and performing ball milling in an inert gas protection atmosphere for 20-50 hours; directly putting the ball-milled powder into a mold of 5 millimeters, applying pressure of 2-8 MPa to the mold, maintaining pressure for 2-10 minutes, and taking a sheet out of the mold; and putting the sheet into a tubular sintering furnace, vacuumizing, charging argon gas into the furnace, sintering in an argon gas protection atmosphere in the pressure range of -0.02 to 0.02 MPa, raising the temperature to 550-650 DEG C at the temperature raising rate of 5-10 DEG C per minute, sintering at preserved heat for 12-24 hours, and cooling to the room temperature at the cooling speed of 10-20 DEG C per minute. Due to the adoption of the method, sintering of the FeSe superconducting material at a low temperature in a short period of time is facilitated, efficiency is increased, and energy consumption is lowered.

Description

technical field [0001] This technology is to improve the sintering efficiency of FeSe superconducting materials, specifically, it is a technology for shortening the sintering preparation time of FeSe superconducting materials. It belongs to the technical field of practical application of low-cost superconducting materials. Background technique [0002] Since the discovery of superconductivity, because of its unique physical properties, superconducting materials have potential economic value and broad application fields. The emergence of copper oxide high-temperature superconductors has brought the superconducting critical temperature into the liquid nitrogen temperature range. However, until now, the research on the mechanism of high-temperature superconductivity has not given a generally accepted theoretical explanation, which seriously restricts the development of superconducting technology. The newly discovered iron-based high-temperature superconductor LaOFeAs in Februa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00
Inventor 刘永长董茂林李小婷马宗青余黎明
Owner TIANJIN UNIV
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