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Metal Sn doped MgB2 superconductor and high-temperature rapid preparation method thereof

A high-temperature, fast, superconductor technology, applied in the field of superconductivity, can solve problems such as easy crystal growth, high crystallinity, and lower critical current density

Inactive Publication Date: 2012-04-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we found few reports on high-performance MgB obtained by doping metal Sn by high-temperature sintering. 2 Superconductor, in addition, the previous high-temperature sintering method takes a long time to sinter at high temperature [14，15] , and in general MgB 2 Crystals are easy to grow at high temperature, and the degree of crystallinity is high, which leads to a decrease in critical current density [16]

Method used

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  • Metal Sn doped MgB2 superconductor and high-temperature rapid preparation method thereof
  • Metal Sn doped MgB2 superconductor and high-temperature rapid preparation method thereof
  • Metal Sn doped MgB2 superconductor and high-temperature rapid preparation method thereof

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example 1

[0025] The Mg powder, B powder and Sn powder are in atomic ratio (Mg 1.02 B 2 ) 0.99 sn 0.01 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders are pressed into cylindrical flakes under a pressure of 2Mpa, and then the pressed samples are placed in a crucible in a high-temperature differential scanning calorimeter, and continuously heated to 850°C at a heating rate of 5°C / min and kept for 0.2 hours The sintering treatment was performed, and then the temperature was lowered to room temperature at a cooling rate of 35° C. / min. It was determined by testing that the sample was composed of MgB 2 , Sn and Mg 2 Sn phase composition (such as figure 2 shown), and MgB 2 The crystals are in good shape (e.g. image 3 shown).

example 2

[0027] The Mg powder, B powder and Sn powder are in atomic ratio (Mg 1.02 B 2 ) 0.97 sn 0.03 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders were pressed into cylindrical flakes under a pressure of 10 MPa, and then the pressed samples were placed in a crucible in a high-temperature differential scanning calorimeter, and continuously heated to 850 °C at a heating rate of 10 °C / min for 0.3 hours. Carry out sintering treatment, and then drop to room temperature at a cooling rate of 30 / min. It was found by physical property measurement (Mg 1.02 B 2 ) 0.97 sn 0.03 The sample has the highest critical current density (such as Figure 4 and 5 shown).

example 3

[0029] The Mg powder, B powder and Sn powder are in atomic ratio (Mg 1.02 B 2 ) 0.95 sn 0.05 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders were pressed into cylindrical flakes under a pressure of 5Mpa, and then the pressed samples were placed in a crucible in a high-temperature differential scanning calorimeter, and continuously heated to 900°C at a heating rate of 20°C / min for 0.4 hours. Carry out sintering treatment, and then drop to room temperature at a cooling rate of 40°C / min. It is determined by detection that the phase in the sample is still composed of MgB 2 , Sn and Mg 2 Sn phase composition (such as figure 2 As shown), it shows that the phase composition does not change much at high temperature, but the high holding temperature at 900°C will lead to grain growth, so it is proved that the (Mg 1.02 B 2 ) 0.95 sn 0.05 The sample can obtain better superconducting performance.

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Abstract

The invention relates to a metal Sn doped MgB2 superconductor and a high-temperature rapid preparation method thereof. A structural formula of the superconductor is (Mg1.02B2)1-xSnx, wherein x=0.01-0.05. The method comprises the following steps: fully mixing Mg powder, B powder and Sn powder according to atomic ratio, pressing and preparing the mixture into a cylindrical flake under the pressure of 2 to 10 MPa, and then putting the cylindrical flake into a high temperature differential scanning calorimeter or a tubular sintering furnace for sintering; and continuously heating the cylindrical flake to 850 to 900 DEG C at heating rate of 5 to 20 DEG C per minute for sintering treatment, and cooling the cylindrical flake to room temperature at cooling rate of 30 to 40 DEG C per minute. The practical application field of MgB2 is in an around 3T magnetic field, so the method improves the superconductivity of the MgB2 superconductor in a short time by doping metal Sn and using a high-temperature sintering method. The preparation method is simple, has low cost of the raw materials and short preparation time, and is a quite potential research method; and simultaneously, the obtained superconductor has obvious superconductivity.

Description

technical field [0001] The invention belongs to the field of superconducting technology, in particular to a metal Sn-doped MgB 2 Superconductors and high-temperature rapid preparation methods. Background technique [0002] The first superconductors date back to the discovery of the superconductivity of mercury in 1911 [1] After nearly a hundred years of hard work, human beings have made great progress in the understanding of superconductivity, and many superconductors have also entered the field of practical application. However, so far new superconductors are still being discovered. Since superconductors are widely used in fields such as electrical energy transmission, motor and generator manufacturing, and military technology [2] , so that superconducting technology has broad application prospects and great development potential. [0003] Since Japanese scientist J.Nagamatsu et al. discovered MgB with a critical transition temperature of 39K in 2001 2 since superconduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04
Inventor 刘永长姜海马宗青董治中余黎明
Owner TIANJIN UNIV
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