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A bi element doped cubic phase germanium calcium thermoelectric material and preparation method thereof

A technology of element doping and thermoelectric materials, which is applied in the field of Ca-Ge alloy material system, can solve the problems that there are no reports on the preparation performance of Ge materials, and no reports on preparation research have been reported, and meet the needs of large-scale production, low reaction temperature, and low temperature. cost effect

Inactive Publication Date: 2019-09-13
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Judging from the current research status at home and abroad, the Ca 2 The research on Ge materials mainly focuses on theoretical research and experimental research related to the phase diagram of Ca-Ge system, and there is almost no research on Ca 2 Reports on the preparation of Ge materials and their related properties, especially by elemental Bi doping of cubic Ca 2 The preparation of Ge materials has not been reported

Method used

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  • A bi element doped cubic phase germanium calcium thermoelectric material and preparation method thereof
  • A bi element doped cubic phase germanium calcium thermoelectric material and preparation method thereof
  • A bi element doped cubic phase germanium calcium thermoelectric material and preparation method thereof

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Embodiment 1

[0026] A kind of Bi element doped cubic Ca 2 Ge material and preparation method thereof, comprising the following steps:

[0027] (1) Ca powder, Ge powder and Bi powder are mixed uniformly under the argon protective atmosphere by the mol ratio of Ca:Ge:Bi=82:21:1;

[0028] (2) Vacuumize the vacuum magnetic induction levitation melting furnace, and then fill it with argon gas for protection. The mixture obtained in step (1) is placed in the water-cooled crucible of the vacuum magnetic induction levitation melting furnace, heated to 950° C., so that Ca, Ge and Bi in the crucible are in a molten state, and the melting time is 15 minutes; the surface impurities are removed after melting. This process is repeated 3 times;

[0029] (3) Place the molten liquid obtained in step (2) in a vacuum quenching furnace, and then fill it with high-purity argon to remelt the alloy; then the melt is thrown out by a water-cooled molybdenum wheel at a linear speed of 30m / s , obtained needle-sha...

Embodiment 2

[0036] A kind of Bi element doped cubic Ca 2 Ge material and preparation method thereof, comprising the following steps:

[0037] (1) Ca powder, Ge powder, Bi powder are mixed uniformly under the argon protection atmosphere by the mol ratio of Ca:Ge:Bi=82:21:2;

[0038] (2) Vacuumize the vacuum magnetic induction levitation melting furnace, and then fill it with argon gas for protection. The mixture obtained in step (1) is placed in the water-cooled crucible of the vacuum magnetic induction levitation melting furnace, heated to 1000°C, so that Ca, Ge and Bi in the crucible are in a molten state, and the smelting time is 30 minutes; after smelting, the surface impurities are removed. This process is repeated 4 times;

[0039] (3) Place the molten liquid obtained in step (2) in a vacuum quenching furnace, and then fill it with high-purity argon to remelt the alloy; then the melt is thrown out by a water-cooled molybdenum wheel at a linear speed of 40m / s , obtained needle-shap...

Embodiment 3

[0046] A kind of Bi element doped cubic Ca 2 Ge material and preparation method thereof, comprising the following steps:

[0047] (1) Ca powder, Ge powder, Bi powder are mixed uniformly under the argon protection atmosphere by the mol ratio of Ca:Ge:Bi=82:21:2.5;

[0048] (2) Vacuumize the vacuum magnetic induction levitation melting furnace, and then fill it with argon gas for protection. The mixture obtained in step (1) is placed in the water-cooled crucible of the vacuum magnetic induction levitation melting furnace, heated to 1100° C., so that Ca, Ge and Bi in the crucible are in a molten state, and the melting time is 45 minutes; the surface impurities are removed after melting. This process is repeated 5 times;

[0049] (3) Place the molten liquid obtained in step (2) in a vacuum quenching furnace, and then fill it with high-purity argon to remelt the alloy; then the melt is thrown out by a water-cooled molybdenum wheel at a linear speed of 50m / s , obtained needle-sha...

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Abstract

The invention discloses a Bi element doped cubic phase Ca 2 The Ge material and its preparation method comprise the following steps: uniformly mixing Ca powder, Ge powder and Bi powder in a certain molar ratio under an argon protective atmosphere; placing them in a water-cooled crucible of a vacuum magnetic induction levitation melting furnace, heating and melting ; The obtained molten liquid is placed in a vacuum quenching furnace, filled with high-purity argon, and the alloy is remelted. Quick-setting powder; after manual grinding, the obtained powder is heated and kept under vacuum conditions, and then heated and pressed to make a block sample; then hot-pressed and placed in a vacuum tube furnace, heated and kept, cooled to obtain Bi element doped cubic phase Ca 2 Ge sample. The Bi element doped cubic phase Ca obtained by the present invention 2 Ge materials have fine grains, uniform alloy composition and structure, and compact structure, and have good industrialization prospects.

Description

technical field [0001] The invention relates to the field of Ca-Ge alloy material system, in particular to a Bi element-doped cubic-phase germanium-calcium thermoelectric material Ca 2 Ge and its preparation method. Background technique [0002] Problems such as resource shortage, energy crisis, environmental pollution, and lack of non-renewable resources are becoming more and more prominent. It is of great significance to establish energy conservation and environmental protection awareness, and strive to explore and develop new, environmentally friendly, renewable and circular energy sources. Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to achieve direct mutual conversion of thermal energy and electrical energy. Thermoelectric materials have become the focus of attention. Thermoelectric materials have the advantages of light weight, simple structure, no noise, no pollution, etc., and have potential application prosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C24/00
CPCC22C1/0408C22C24/00C22C1/047
Inventor 温翠莲谢秋罕张炜坚萨百晟叶健霞余新江
Owner FUZHOU UNIV