Bi Cu 1-x SeO-based oxide thermoelectric ceramic material and preparation method thereof

A ceramic material and oxide technology, applied in the field of BiCu1-xSeO-based oxide thermoelectric ceramic materials and their preparation, can solve the problems of complex sintering process, cumbersome process cost, etc., and achieve low sintering temperature, short reaction time, and improved sample performance. Effect

Inactive Publication Date: 2012-08-22
TSINGHUA UNIV
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of BiCuSeO mostly adopts the solid phase method. Due to the low melting point of Bi and Se metals, the two-step solid phase sintering method is mostly us

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
  • Bi Cu 1-x SeO-based oxide thermoelectric ceramic material and preparation method thereof
  • Bi Cu 1-x SeO-based oxide thermoelectric ceramic material and preparation method thereof
  • Bi Cu 1-x SeO-based oxide thermoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1. Preparation of BiCuSeO-based oxide thermoelectric ceramic material

[0028] According to the stoichiometric ratio in BiCuSeO, weigh Bi, Cu, Se and Bi 2 O 3 , The mixed material is obtained after mixing; the mixed material is placed in a ball mill tank for dry milling at a speed of 400 rpm for 8 hours to obtain a precursor powder; the precursor powder is dried at 60° C. for 12 hours; then the powder is put into Spark plasma sintering is carried out in the graphite abrasives, the heating rate is controlled to 300℃ / min, the final temperature is 300℃ for 6min, and the pressure is 50Mpa; then the heating rate is controlled to 300℃ / min, and the final temperature is 700℃ for 8min. , The pressure is 50Mpa, the BiCuSeO-based oxide thermoelectric ceramic material is obtained.

[0029] The XRD spectrum of the sample prepared in this example is as figure 1 As shown, the figure shows that its composition is correct; the SEM spectrum of the sample is as follows figure 2 As sho...

Example Embodiment

[0031] Example 2. Preparation of BiCu 0.985 SeO-based oxide thermoelectric ceramic material

[0032] Follow BiCu 0.985 The stoichiometric ratio in SeO, weighing Bi, Cu, Se and Bi 2 O 3 , The mixed material is obtained after mixing; the mixed material is placed in a ball milling tank for dry milling at a speed of 250 rpm for 2 hours to obtain a precursor powder; the precursor powder is dried at 50°C for 24 hours; then the powder is put into Spark plasma sintering is carried out in graphite abrasives, the heating rate is controlled to 50℃ / min, the final temperature is 200℃ for 4min, and the pressure is 30Mpa; then the heating rate is controlled to 50℃ / min, and the final temperature is 600℃ for 4min. , The pressure is 30Mpa, and BiCu is obtained 0.985 SeO-based oxide thermoelectric ceramic material.

[0033] The XRD spectrum of the sample prepared in this example is as figure 1 As shown, the figure shows that its composition is correct; the SEM spectrum of the sample is as follows fi...

Example Embodiment

[0035] Example 3. Preparation of BiCu 0.975 SeO-based oxide thermoelectric ceramic material

[0036] Follow BiCu 0.975 The stoichiometric ratio in SeO, weighing Bi, Cu, Se and Bi 2 O 3 , The mixed material is obtained after mixing; the mixed material is placed in a ball milling tank for dry milling at a rotation speed of 300 rpm for 10 hours to obtain a precursor powder; the precursor powder is dried at 70° C. for 4 hours; then the powder is put into Spark plasma sintering is carried out in the graphite abrasive tool, the heating rate is controlled to 150℃ / min, the final temperature is 250℃ for 10 min, and the pressure is 40Mpa; then the heating rate is controlled to 150℃ / min, and the final temperature is 650℃ for 10 min. , The pressure is 40Mpa, and BiCu is obtained 0.975 SeO-based oxide thermoelectric ceramic material.

[0037] The XRD spectrum of the sample prepared in this example is as figure 1 As shown, the figure shows that its composition is correct; the SEM spectrum of the...

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 discloses a Bi Cu 1-x SeO-based oxide thermoelectric ceramic material and a preparation method thereof, wherein x is more than or equal to 0 but less than or equal to 0.1; the preparation method comprises the following steps of: (1) according to the stoichiometric proportion in Bi Cu 1-x SeO, weighing Bi, Cu, Se and Bi2O3, mixing to obtain mixture; (2) grinding the obtained mixture to obtain precursor powder; and (3) carrying out spark plasma sintering on the precursor powder to obtain the Bi Cu 1-x SeO-based oxide thermoelectric ceramic material. The Bi Cu 1-x SeO-based oxide thermoelectric ceramic material not only has higher electrical property, but also maintains lower heat transmission performance and has good thermoelectric transmission performance by introducing Cu defect, thus being a novel high-temperature oxide thermoelectric ceramic material with a wide application prospect. Compared with the common solid phase sintering, the method is short in reaction time, low in sintering temperature and simpler in synthesis process, and can be used for further synthesizing a Bi Cu 1-x SeO-based ceramic sample.

Description

technical field [0001] The present invention relates to a kind of BiCu 1-x SeO-based oxide thermoelectric ceramic material and preparation method thereof. Background technique [0002] The performance of thermoelectric materials is generally determined by the dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ, where α, σ, κ, and T represent the Seebeck coefficient, electrical conductivity, thermal conductivity, and absolute temperature of the material, respectively). Excellent thermoelectric materials should have high absolute value of Seebeck coefficient, high electrical conductivity and low thermal conductivity. The currently studied thermoelectric materials include metal solid solutions, alloy semiconductors, and oxide thermoelectric materials. For a long time, the research focus has been on Bi2Te3-based alloys, filled Skutterudites-type alloys, and Half-Heusler alloys. However, these alloys have low melting points and contain harmful Substances, easy oxidati...

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
IPC IPC(8): C04B35/453C04B35/622
Inventor 林元华刘勇兰金叻刘耀春成波沈洋南策文
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products