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Preparation method of SiC-B4C composite thermoelectric material

A thermoelectric material and composite technology, applied in the field of preparation of inorganic composite materials, can solve problems such as high sintering temperature, achieve energy saving, great social and economic benefits, and reduce manufacturing costs

Inactive Publication Date: 2010-09-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a SiC-B 4 Preparation method of C composite thermoelectric material to overcome existing SiC-B 4 Defects of high sintering temperature in the preparation method of C composite thermoelectric materials

Method used

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  • Preparation method of SiC-B4C composite thermoelectric material
  • Preparation method of SiC-B4C composite thermoelectric material
  • Preparation method of SiC-B4C composite thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 84ml of ethyl orthosilicate, 25ml of absolute ethanol, and 27ml of distilled water, pour them into a large beaker, add concentrated nitric acid dropwise while stirring, adjust the pH value to 2, and then pour 15gB 4 C. Stir vigorously. At the same time, pour 42g of sucrose into a small beaker, add 23ml of distilled water to dissolve, and adjust the pH value of the sucrose water to 2. After 1h, pour the dissolved sucrose water into a large beaker, and continue stirring vigorously for 5h after mixing. , after aging at 40°C for 24h, put it into an oven for drying at 80°C, and grind it into powder after drying for 24h.

[0030] Weigh 25g of powder and pour it into a graphite mold. Under the protection of argon, heat up to 1500°C at 20°C / min, and start to apply pressure at a temperature of 41.52MPa, keep the pressure for 1h, and cool naturally to obtain SiC-B 4 Ccomposites.

[0031] figure 1 is the XRD pattern of the sintered sample, except for B 4 In addition to th...

Embodiment 2

[0033] Weigh 140ml tetraethyl orthosilicate, 40ml absolute ethanol, 50ml distilled water, pour into a large beaker, add concentrated nitric acid dropwise while stirring, adjust the pH value to 1, then pour 3gB 4 C. Stir vigorously. At the same time, pour 76g of sucrose into a small beaker, add 40ml of distilled water to dissolve, and adjust the pH value of the sucrose water to 1. After 3 hours, pour the dissolved sucrose water into a large beaker, and continue stirring vigorously for 6 hours after mixing. , aged at 50°C for 12h, put into an oven for drying at 60°C, dried for 36h and then ground into powder.

[0034] Weigh 25g of powder and pour it into a graphite mold. Under the protection of argon, heat up to 1500°C at 15°C / min, and start to apply pressure at a temperature of 27.68MPa, keep the pressure for 1.5h, and naturally cool to obtain SiC-B 4 Ccomposites.

[0035] image 3 It is the XRD spectrum of the sintered sample. It can be seen from the figure that the main cry...

Embodiment 3

[0037] Weigh 100ml tetraethyl orthosilicate, 30ml absolute ethanol, 40ml distilled water, pour into a large beaker, add concentrated nitric acid dropwise while stirring, adjust the pH value to 3, then pour 9gB 4 C. Stir vigorously. At the same time, pour 59g of sucrose into a small beaker, add 40ml of distilled water to dissolve, and adjust the pH value of the sucrose water to 3. After 2h, pour the dissolved sucrose water into a large beaker, and continue stirring vigorously for 4h after mixing. , aged at 45°C for 24h, put in an oven for drying at 100°C, dried for 12h and then ground into powder.

[0038] Weigh 25g of powder and pour it into a graphite mold. Under the protection of argon, heat up to 1600°C at 30°C / min, and start to apply pressure at a temperature of 55.36MPa, keep the pressure for 1h, and cool naturally to obtain SiC-B 4 Ccomposites.

[0039] Figure 5 is the XRD pattern of the sintered sample, from which it can be clearly seen that SiC and B 4 Diffraction pe...

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Abstract

The invention belongs to the technical field of the preparation of an inorganic composite material, and in particular relates to a preparation method of a SiC-B4C composite thermoelectric material. The preparation method comprises the following steps: preparing a SiO2 precursor by a sol-gel method, adding B4C and sucrose in the preparation process of the precursor, aging the precursor, drying, grinding, then pouring into a graphite mold, and preparing the SiC-B4C composite material by the sintering of a thermal compression reaction. The invention can prepare the SiC-B4C composite thermoelectric material at lower temperature, saves the energy, reduces the manufacturing cost, and meanwhile actively promotes the development of the high-temperature thermoelectric material, thereby having huge social benefits and economic benefits.

Description

(1) Technical field [0001] The invention belongs to the technical field of preparation of inorganic composite materials, in particular to a SiC-B 4 Preparation method of C composite thermoelectric material. (2) Background technology [0002] With the increasingly serious environmental pollution and energy crisis, the development of new environmentally friendly materials has attracted more and more attention from all over the world. Thermoelectric materials are functional materials that can convert thermal energy and electrical energy into each other. They have the advantages of small size, light weight, no noise during work, long service life, and easy control. They are favored by people and become a hot spot in current scientific research. one. Thermoelectric materials can be divided into low-temperature, medium-temperature, and high-temperature thermoelectric materials according to their operating temperature. Because materials are prone to oxidation and melting at high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/565C04B35/624
Inventor 王海龙李明亮张锐关莉陈德良范冰冰许红亮卢红霞李菁袁小帅
Owner ZHENGZHOU UNIV
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