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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 need to introduce an oxidation process, the process is relatively complicated and the preparation cycle is long, which is not suitable for large-scale industrial production.

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Ti 1.12 CoSb composite

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

[0024] TEM analysis confirmed the presence of abundant nanoscale TiO in the matrix 2 particles (see Figure 1). These nano-TiO 2 The particles greatly reduce the lattice thermal conductivity of ...

Embodiment 2

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

[0026] Using the method mentioned in the summary of the invention, high-purity Ti, Co, Sb and Fe are used as raw materials, and the ingredients are mixed in a molar ratio of 1.09:0.85:1:0.15. After mixing evenly, they are pressed into sheets and put into an electric arc melting furnace. After evacuating, fill it with argon for the first melting, and the melting time lasts for 40 seconds. After cooling, vacuumize, then fill with oxygen, the filling amount is 40% of the excess Ti moles, and then fill with argon to carry out the second smelting. In the second smelting, the working current was continuously adjusted and the sample was turned over and smelted 4 times repeatedly. Repeat the previous step twice, the amount of oxygen charged is respectively 35% and 20% of the excess Ti moles, and finally the sample is cut into a standard shape for testing. The lattice thermal conductivity and ZT value of the materia...

Embodiment 3

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

[0028]The metal raw materials Ti, Co, Sb and Ni are batched according to the molar ratio of 1.06:0.92:1:0.08, mixed uniformly, pressed into sheets, and put into an electric arc melting furnace. After evacuating, fill with argon for the first smelting, and the smelting time lasts for 4 minutes. After cooling, evacuate, then fill with oxygen, the filling amount is 95% of the excess Ti moles, and then fill with argon to carry out 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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