Low-temperature sintering method of Mg<11>B2 isotope superconductor

A low-temperature sintering and mg11b2 technology, applied in the field of superconductivity, can solve problems such as unsatisfactory bulk superconductivity, low reactivity, and sample failure, and achieve simple and controllable preparation methods, stable chemical properties, and high critical transition temperature Effect

Inactive Publication Date: 2016-07-27
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large number of previous studies are still in the initial stage of predicting properties by theoretical calculations, and the superconducting properties of only a few experimentally p

Method used

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  • Low-temperature sintering method of Mg&lt;11&gt;B2 isotope superconductor
  • Low-temperature sintering method of Mg&lt;11&gt;B2 isotope superconductor
  • Low-temperature sintering method of Mg&lt;11&gt;B2 isotope superconductor

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Effect test

Embodiment 1

[0020] Mole ratio is Mg: 11 The ratio of B=0.9:2 mixes the raw materials fully in an agate mortar, then presses it into small pieces under a pressure of 5MPa, and puts the pressed sample into a thermogravimetric differential thermal analyzer (MettlerToledoTGA / DSC1 / ) In the process, the argon gas is introduced to carry out low-temperature sintering, and the setting program is as follows: the heating rate is 20°C / min, and after rising to 450°C, the temperature is kept for sintering at this temperature for 15 hours, and then the cooling rate is 20°C / min to room temperature. , synthesized to obtain Mg 11 B 2 Isotopic superconducting bulk.

Embodiment 2

[0022] Mole ratio is Mg: 11 The ratio of B=1.05:2 fully mixes the raw materials in the agate mortar, then it is pressed into small pieces under a pressure of 10MPa, and the pressed sample is put into a thermogravimetric differential thermal analyzer (MettlerToledoTGA / DSC1 / ), the argon gas was introduced for low-temperature sintering, and the setting program was as follows: the heating rate was 10°C / min, and after rising to 600°C, the temperature was kept for sintering at this temperature for 5 hours, and then the cooling rate was 40°C / min. room temperature, synthesized to obtain Mg 11 B 2 Isotopic superconducting bulk.

Embodiment 3

[0024] Mole ratio is Mg: 11 The ratio of B=1.2:2 mixes the raw materials fully in an agate mortar, then presses them into small pieces under a pressure of 2MPa, and puts the pressed samples into a thermogravimetric differential thermal analyzer (MettlerToledoTGA / DSC1 / ) In the process, the argon gas was introduced for low-temperature sintering, and the setting program was as follows: the heating rate was 40°C / min, and after rising to 800°C, the temperature was kept for sintering at this temperature for 10 hours, and then the cooling rate was 10°C / min to room temperature. , synthesized to obtain Mg 11 B 2 Isotopic superconducting bulk.

[0025] Only Mg and 11 B is the experimental raw material in order to prepare more pure Mg 11 B 2 , using low-temperature solid-state sintering method to prepare Mg11 B 2 Superconductors can not only effectively reduce the volatilization of Mg, but also reduce the oxidation rate, so as to obtain a purer superconducting phase, from image 3...

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Abstract

The invention relates to a low-temperature sintering method of a Mg<11>B2 isotope superconductor. The method comprises the following steps: sufficiently mixing Mg powder and amorphous <11>B powder in a ratio of (0.9-1.2):2 in an agate mortar, and making the mixture into cylindrical pieces under a pressure of 2-10MPa; putting the cylindrical pieces into a thermogravimetric and differential thermal analyzer; in an atmosphere of flowing high-purity argon, heating to 450-800 DEG C at a rate of 10-40 DEG C/min, and preserving heat for 5-15 hours; cooling to room temperature along with furnace at a cooling speed of 10-40 DEG C/min to synthesize the Mg<11>B2 isotope superconductor. In the invention, a Mg<11>B2 superconductor material with high carrying current and 'low activity' is obtained through a low-temperature and solid-phase sintering method. The crystal structure is a hexagonal structure; and the Mg<11>B2 isotope superconductor has the advantages of relatively high critical transition temperature, stable chemical properties, simple components, no pollution, wide source of raw materials, relatively low preparation cost and use cost and wide application prospect.

Description

technical field [0001] The invention belongs to the field of superconducting technology, and particularly proposes high current-carrying "low activity" Mg 11 B 2 Low-temperature sintering preparation technology of isotopic superconducting bulk. Background technique [0002] In early 2001, Nagamatsu et al. found that the superconducting critical transition temperature (T c )39K of MgB 2 The new superconductor has aroused widespread concern in the scientific community. MgB 2 It has excellent properties such as simple structure, long coherence length, high critical current density and stable chemical properties. [0003] Controlled thermonuclear fusion energy is the ultimate ideal clean energy for mankind. The Tokamak, which uses a strong magnetic field to confine high-temperature plasma, is considered to be the most promising device for realizing controllable thermonuclear fusion reactions. As a key component of the tokamak, the research and development of a stable supe...

Claims

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Application Information

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IPC IPC(8): C04B35/58H01B12/00
CPCC04B35/58057H01B12/00Y02E40/60
Inventor 马宗青程芳刘永长蔡奇陈宁彭俊明
Owner TIANJIN UNIV
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