Adulterated titanium-cobalt-stibium based thermoelectric composite material, and preparation method

A composite material, a titanium-cobalt-antimony-based technology, applied in the field of doped titanium-cobalt-antimony-based thermoelectric composite materials and its preparation, can solve the problems of unsuitability for large-scale industrial production, lower lattice thermal conductivity, and long preparation cycle , to achieve good electrical transmission performance, reduce lattice thermal conductivity, and low cost

Inactive Publication Date: 2007-05-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the oxide distribution of the composite material prepared by this method is uniform and the thermal conductivity of the lattice is greatly reduced, due to the ne

Method used

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  • Adulterated titanium-cobalt-stibium based thermoelectric composite material, and preparation method
  • Adulterated titanium-cobalt-stibium based thermoelectric composite material, and preparation method
  • Adulterated titanium-cobalt-stibium based thermoelectric composite material, and preparation method

Examples

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Example Embodiment

[0022] Example 1: Ti 1.12 CoSb composite

[0023] Using the method mentioned in the content of the invention, high-purity Ti, Co, and Sb are used as raw materials, and the ingredients are mixed at a molar ratio of 1.12:1:1, mixed and uniformly pressed into flakes, and placed in an electric arc melting furnace. After vacuuming, argon is filled for the first smelting, and the smelting time lasts for 1 minute and 30 seconds. After cooling, it is evacuated and then filled with oxygen, the filling amount is 50% of the excess Ti mole number, and then filled with argon gas for the second smelting. In the second smelting, the working current was continuously adjusted and the sample was turned and smelted repeatedly 4 times. Repeat the previous step, the oxygen charge is 48% of the excess Ti moles.

[0024] TEM analysis confirmed that there is a large amount of nano-scale TiO in the matrix 2 Particles (see Figure 1). These nano TiO 2 The particles greatly reduce the lattice thermal conduct...

Example Embodiment

[0025] Example 2: Ti 1.09 Co 0.85 Fe 0.15 Sb composite

[0026] Using the method mentioned in the content of the invention, high-purity Ti, Co, Sb and Fe are used as raw materials, mixed with a molar ratio of 1.09:0.85:1:0.15, mixed evenly and pressed into a flake shape, and placed in an electric arc melting furnace. After vacuuming, it is filled with argon for the first smelting, and the smelting time lasts for 40 seconds. After cooling, it is evacuated and then filled with oxygen. The filling amount is 40% of the excess Ti moles, and then filled with argon gas for the second smelting. In the second smelting, the working current was continuously adjusted and the sample was turned and smelted repeatedly 4 times. Repeat the previous step twice, the oxygen filling amount is 35% and 20% of the excess Ti moles respectively, and finally the sample is cut into a standardized shape for testing. The lattice thermal conductivity and ZT value of the material are shown in Figure (4) and Figu...

Example Embodiment

[0027] Example 3: Ti 1.06 Co 0.92 Ni 0.08 Sb composite

[0028]The metal raw materials Ti, Co, Sb and Ni are compounded at a molar ratio of 1.06:0.92:1:0.08, mixed and uniformly pressed into a flake shape, and placed in an electric arc smelting furnace. After vacuuming, argon gas is filled for the first smelting, and the smelting time lasts for 4 minutes. After cooling, it is evacuated and then filled with oxygen, the filling amount is 95% of the excess Ti moles, and then filled with argon gas for the second smelting. In the second smelting, the working current was continuously adjusted and the sample was turned over and smelted 5 times repeatedly. Tested Ti 1.06 Co 0.92 Ni 0.08 The lattice thermal conductivity of Sb is higher than that of TiCo 0.92 Ni 0.08 Sb is reduced by 1 / 3, and the maximum ZT value reaches 0.38 at 850K.

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Abstract

This invention relates to a method for preparing doped Ti-Co-Sb thermoelectric composites. The general chemical formula of doped Ti-Co-Sb thermoelectric composites is Ti1+xCoy(Me)1-ySbz(Me')1-z, where, x is 0.05-0.20; y is 0.80-1.0; z is 0.85-1.0; Me is one of Ni, Fe, Pd and Pt; Me' is one of Sn, Te and Ge. The method comprises: mixing the raw materials according to the formula, pressing into lamellae, and smelting to obtain TiO2 nanoparticles. The doped Ti-Co-Sb thermoelectric composites have high electrical conductivity, low lattice heat conductivity, and high thermoelectric performance.

Description

technical field [0001] The invention relates to a doped titanium-cobalt-antimony-based thermoelectric composite material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor materials to directly convert energy. It has the characteristics of small size, high reliability, and long life. It is used in waste heat power generation, space science, military Equipment, household appliances and many other fields play an important role. Its conversion efficiency mainly depends on the dimensionless performance index of the material, ZT value (ZT=α 2 σT / κ, where α is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity, and T is the absolute temperature). The higher the ZT value, the better the material performance and the higher the energy conversion efficiency. At pre...

Claims

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Application Information

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IPC IPC(8): C22C12/00C22C30/00C22C1/02
Inventor 陈立东吴汀柏胜强赵雪盈
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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