Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of N-type bismuth telluride polycrystalline block thermoelectric material

A thermoelectric material, bismuth telluride technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device node lead-out materials, etc. Reduce the service life and performance of the refrigerator, and achieve the effect of strengthening the mechanical performance and thermoelectric performance, good transportation performance, and high thermoelectric performance

Pending Publication Date: 2021-01-29
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
View PDF11 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a preparation method of N-type bismuth telluride polycrystalline bulk thermoelectric material, which can effectively solve the problem that the mechanical properties of the material cannot be completely refined due to the special structure of the zone melting bismuth telluride material. And the deterioration of thermoelectric performance, resulting in the problem of the service life and performance reduction of thermoelectric cooler

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of N-type bismuth telluride polycrystalline block thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] S1. Raw material crushing: Put the vacuum-packed raw materials tellurium ingot, bismuth ingot, and selenium ingot on the filter paper respectively, and smash the material into small pieces through the packaging with a wooden hammer. Open the packaging bag, use tweezers to pick up small pieces with a diameter of no more than 30mm and place them on clean filter paper. Crushing the raw material into small pieces can make the raw material melt better in the S3 step.

[0019] S2. Vacuum sealing tube: according to Bi 2 Te 2.8 Se 0.2 Weigh the raw materials obtained in step 1, mix the raw materials, put them into a cleaned glass tube, and then vacuum seal the tube.

[0020] S3. Regional smelting: put the glass tube sealed in step 2 into a swing furnace for melting at high temperature, the melting temperature is 800° C., and the melting time is 3 hours. The obtained ingot was then melted in a zone furnace at a melting temperature of 700°C, a heating rate of 30°C / min, a temp...

Embodiment 2

[0025] S1. Raw material crushing: Put the vacuum-packed raw materials tellurium ingot, bismuth ingot, and selenium ingot on the filter paper respectively, and smash the material into small pieces through the packaging with a wooden hammer. Open the packaging bag, use tweezers to pick up small pieces with a diameter of no more than 30mm and place them on clean filter paper.

[0026] S2. Vacuum sealing tube: according to Bi 2 Te 2.95 Se 0.05 Weigh the raw materials obtained in step 1, mix the raw materials, put them into a cleaned glass tube, and then vacuum seal the tube.

[0027] S3. Regional smelting: put the glass tube sealed in step 2 into a swing furnace for melting at high temperature, the melting temperature is 700° C., and the melting time is 5 hours. The obtained ingot was then smelted in a zone furnace at a melting temperature of 600° C., a heating rate of 20° C. / min, a temperature gradient of 20° C. / cm, and a growth rate of 25 mm / h.

[0028] S4. Ball milling and ...

Embodiment 3

[0032] S1. Raw material crushing: Put the vacuum-packed raw materials tellurium ingot, bismuth ingot, and selenium ingot on the filter paper respectively, and smash the material into small pieces through the packaging with a wooden hammer. Open the packaging bag, use tweezers to pick up small pieces with a diameter of no more than 30mm and place them on clean filter paper.

[0033] S2. Vacuum sealing tube: according to Bi 2 Te 2.93 Se 0.07 Weigh the raw materials obtained in step 1, mix the raw materials, put them into a cleaned glass tube, and then vacuum seal the tube.

[0034] S3. Regional smelting: put the glass tube sealed in step 2 into a swing furnace to melt at a high temperature, the melting temperature is 900° C., and the melting time is 1 hour. The obtained ingot was then melted in a zone furnace at a melting temperature of 800°C, a heating rate of 30°C / min, a temperature gradient of 40°C / cm, and a growth rate of 30mm / h.

[0035] S4. Ball milling and sieving: pu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a preparation method of an N-type bismuth telluride polycrystalline block thermoelectric material. The preparation method comprises the following steps: weighing small blocks according to a certain stoichiometric ratio, mixing the small blocks, putting the small blocks into a glass tube, and vacuumizing to seal the glass tube; putting the sealed glass tube into a rocking furnace, performing high-temperature melting, and smelting an obtained cast ingot in a zone melting furnace; grinding the cast ingot to obtain powder, and sieving the powder by using a mesh sieve; putting the sieved powder into a mold, and carrying out cold press molding to obtain a cold press block; and putting the cold pressing block into an extruding machine, and carrying out hot extrusion on thecold pressing block by the extruding machine to obtain the N-type bismuth telluride polycrystalline block thermoelectric material. The preparation method has the beneficial effects that the problems that due to the special structure of the zone-melting bismuth telluride material, grains cannot be refined thoroughly, the mechanical property and the thermoelectric property of the material become poor, the service life of the thermoelectric refrigerator is shortened, and the performance of the thermoelectric refrigerator is reduced are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and in particular relates to a preparation method of an N-type bismuth telluride polycrystalline block thermoelectric material. Background technique [0002] Thermoelectric materials are functional materials that utilize the interaction between carriers and lattice vibrations in materials to realize direct mutual conversion of thermal energy and electrical energy. Thermoelectric refrigerators made of thermoelectric materials have the characteristics of no noise, no vibration, no refrigerant, small size, light weight, etc., and are reliable in operation, easy to operate, and easy to adjust the cooling capacity. Due to this series of advantages, thermoelectric refrigerators have been widely used in various fields such as industry, agriculture, scientific research and national defense. [0003] The existing bismuth telluride block preparation mainly includes the following methods: ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34H01L35/16H01L35/18H10N10/01H10N10/852H10N10/853
CPCH10N10/853H10N10/852H10N10/01
Inventor 孔繁宇侯旭峰任保国
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST