Deep overcooling solidification process for preparing superconductive MgB2 material

A superconducting material and deep supercooling technology, applied in the field of superconductivity, can solve the problems of cumbersome operation, high experimental conditions, and MgB2 scale failing to meet the ideal requirements, and achieve the effect of avoiding volatilization and lowering the melting point.

Inactive Publication Date: 2007-06-27
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

The two methods of sealed synthesis and pressurized synthesis require high experimental conditions, cumbersome operations, and the prepared MgB 2 Dimensions fail to meet ideal requirements

Method used

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  • Deep overcooling solidification process for preparing superconductive MgB2 material

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Effect test

example 1

[0031] Mg block (purity of 99.9%) and Cu block (purity of 99.9%), as well as Cu block (purity of 99.9%) and B particles (purity of 97%) were mixed at atomic ratios of 58:42 and 86.7:13.3, respectively. Put the ingredients into the quartz crucible, and then put the quartz crucible into the induction coil in the high-frequency induction melting furnace, so that the ingredients are located in the middle of the induction coil, and then close the furnace body and draw a high vacuum until a certain degree of vacuum is reached ( About 3×10 -3 After Pa), fill the furnace with high-purity argon and make the pressure in the furnace a positive pressure (about 0.2MPa) to limit the volatilization and oxidation of Mg, and then use high-frequency induction smelting at 1100°C and 1200°C respectively Two kinds of alloys were obtained after 5mins of smelting. Subsequently, the binary Mg-Cu and Cu-B alloys are mixed according to a ratio of 0.238:1 (wt.%) and then subjected to induction smelting. Aft...

example 2

[0033] Mg block (purity of 99.9%) and Cu block (purity of 99.9%), as well as Cu block (purity of 99.9%) and B particles (purity of 97%) were mixed at atomic ratios of 58:42 and 86.7:13.3, respectively. Put the ingredients into the quartz crucible, and then put the quartz crucible into the induction coil in the high-frequency induction melting furnace, so that the ingredients are located in the middle of the induction coil, and then close the furnace body and draw a high vacuum until a certain degree of vacuum is reached ( About 3×10 -3 After Pa), fill the furnace with high-purity argon and make the pressure in the furnace a positive pressure (about 0.2MPa) to limit the volatilization and oxidation of Mg, and then use high-frequency induction smelting at 1100°C and 1200°C respectively Two kinds of alloys were obtained after 5mins of smelting. Subsequently, the binary Mg-Cu and Cu-B alloys were mixed according to a ratio of 0.238:1 (wt.%) and then subjected to induction smelting. Af...

example 3

[0035] Mg block (purity of 99.9%) and Cu block (purity of 99.9%), as well as Cu block (purity of 99.9%) and B particles (purity of 97%) were mixed at atomic ratios of 58:42 and 86.7:13.3, respectively. Put the ingredients into the quartz crucible, and then put the quartz crucible into the induction coil in the high-frequency induction melting furnace, so that the ingredients are located in the middle of the induction coil, and then close the furnace body and draw a high vacuum until a certain degree of vacuum is reached ( About 3×10 -3 After Pa), fill the furnace with high-purity argon and make the pressure in the furnace a positive pressure (about 0.2MPa) to limit the volatilization and oxidation of Mg, and then use high-frequency induction smelting at 1100°C and 1200°C respectively Two kinds of alloys were obtained after 5mins of smelting. Subsequently, the binary Mg-Cu and Cu-B alloys were mixed according to a ratio of 0.238:1 (wt.%) and then subjected to induction smelting. Af...

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Abstract

The present invention relates to deeply overcooling solidification process for preparing superconductive MgB2 material. The process includes the following steps: smelting the mixture of Mg and Cu of purity 99.9 % in the atom ratio of 52-65 to 35-48 and the mixture of Cu and B in purity of 97 % in the atom ratio of 82-95 to 5-18 separately in high frequency inducing furnace at 1000-1500 deg.c for 5-10 min to obtain eutectic Mg-Cu alloy and Cu-B alloy; mixing Mg-Cu alloy and Cu-B alloy in the weight ratio of 0.2-1.5 to 1 and smelting similarly to obtain ternary Mg-Cu-B alloy; cutting the ternary Mg-Cu-B alloy into small blocks and deeply overcooling solidification at 10-320 K in a quick liquid quenching apparatus to obtain deeply overcooling solidified ternary Mg-Cu-B alloy. The process can lower the smelting point of metals and avoid the evaporization of Mg, and MgB2 monocrystal separation and growth of ternary Mg-Cu-B alloy at relatively low temperature.

Description

Technical field [0001] The invention belongs to the field of superconducting technology, in particular to the preparation of MgB by a deep supercooling rapid solidification method 2 Superconducting materials. Background technique [0002] Since the discovery that mercury has superconductivity in 1911, scientists have begun the competition for the microscopic mechanism and application of superconducting materials. The unique zero resistance and diamagnetism of superconducting materials make them have broad application prospects in the fields of power energy, superconducting magnets, biology, medical technology, communications and microelectronics. Nowadays, the research on superconductivity in countries all over the world is becoming more and more popular. The United States, Japan and the European Union have listed superconducting technology as the key to maintaining cutting-edge advantages in the new century. [0003] Superconducting materials can be divided into two categories a...

Claims

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Application Information

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IPC IPC(8): C01B35/04
Inventor 刘永长史庆志马宗青赵倩
Owner TIANJIN UNIV
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