Method for preparing Cu2Se thermoelectric material by low-temperature solid-phase reaction

A technology of solid-state reaction and thermoelectric materials, applied in sustainable manufacturing/processing, climate sustainability, chemical industry, etc., can solve the problem of unfavorable material phase composition regulation and thermoelectric performance optimization, optimization research of limiting material thermoelectric performance, very It is difficult to accurately control the content of Se in the product, etc., to achieve the effect of uniform distribution of product components, low cost of raw materials, and low price

Inactive Publication Date: 2012-09-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently Cu 2 The synthesis of Se-based thermoelectric materials mainly adopts the melting method, but due to the existence of high-melting Cu simple substance in the reaction raw materials, the reaction temperature of the melting method is generally higher, higher than 1000 ° C, and the boiling point of Se is

Method used

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  • Method for preparing Cu2Se thermoelectric material by low-temperature solid-phase reaction
  • Method for preparing Cu2Se thermoelectric material by low-temperature solid-phase reaction
  • Method for preparing Cu2Se thermoelectric material by low-temperature solid-phase reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0026] a Cu 2 The solid-phase reaction preparation method of Se thermoelectric material, it comprises the steps:

[0027] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of Cu powder and Se powder as 2:1, weigh the total amount to 4.1212g, and mix the raw material powder in a mortar Uniform, get mixed powder;

[0028] 2) Press the mixed powder into a cylindrical block with a diameter of 10mm at a pressure of 10MPa on a tablet press, place the cylindrical block in a graphite crucible (15mm in outer diameter), vacuumize and seal it in quartz glass tube (with an inner diameter of 17 mm and an outer diameter of 20 mm), and then placed in a muffle furnace for solid-state reaction, using a heating rate of 2 °C / min from 200 °C to 650 °C, and then holding at 650 °C for 12 hours, the end of the holding After cooling with the furnace, the resulting product is ground into powder;

[0029] The XRD pattern of the powder sample...

Embodiment 2

[0033] a Cu 2 The solid-phase reaction preparation method of Se thermoelectric material, it comprises the steps:

[0034] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of Cu powder and Se powder as 2:1, weigh the total amount to 4.1212g, and mix the raw material powder in a mortar Uniform, get mixed powder;

[0035] 2) Press the uniformly mixed powder into a cylindrical block with a pressure of 12MPa on a tablet press, place the cylindrical block in a graphite crucible, vacuumize and seal it in a quartz glass tube, and then place it in a muffle Carry out solid-state reaction in the furnace, use a heating rate of 3°C / min to raise the temperature from 200°C to 700°C, and then keep it at 700°C for 12 hours. After the heat preservation is completed, cool with the furnace, and grind the obtained product into powder;

[0036] The XRD spectrum of the powder sample obtained through solid phase reaction is shown in figu...

Embodiment 3

[0040] a Cu 2 The solid-phase reaction preparation method of Se thermoelectric material, it comprises the steps:

[0041] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of Cu powder and Se powder as 2:1, weigh the total amount to 4.1212g, and mix the raw material powder in a mortar Uniform, get mixed powder;

[0042] 2) Press the mixed powder into a cylindrical block with a pressure of 15 MPa on a tablet press, place the cylindrical block in a graphite crucible, vacuumize and seal it in a quartz glass tube, and then place it in a muffle furnace Carry out solid-state reaction, use a heating rate of 5°C / min to raise the temperature from 200°C to 750°C, then keep it at 750°C for 12 hours, cool with the furnace after the heat preservation, and grind the obtained product into powder;

[0043] The XRD spectrum of the powder sample obtained through the solid phase reaction is shown in image 3 In (a), by image 3 In (a),...

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Abstract

The invention relates to a method for preparing a Cu2Se thermoelectric material. The method for preparing the Cu2Se thermoelectric material by the low-temperature solid-phase reaction is characterized by comprising the following step: 1) weighing Cu powder and Se powder according to the molar ratio of 2:1 and mixing the Cu powder and the Se powder uniformly to obtain mixed powder, wherein the Cu powder and the Se powder serve as raw materials; 2) pressing the mixed powder into a block body by using tablet press, placing the block body into a graphite crucible, vacuumizing, sealing into a quartz glass tube, placing into a muffle furnace, performing solid-phase reaction at the temperature of between 650 and 750 DEG C for 12 to 24 hours, and grinding the obtained product into powder; and 3) performing spark plasma sintering on the powder obtained in the step 2) to obtain a compact block body, namely the Cu2Se thermoelectric material. By the method, the raw materials have low cost; the reaction temperature is low; energy is saved; and the materials are fed according to the stoichiometric ratio of the Cu2Se, so the product composition can be controlled precisely; and the repeatability is high.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a Cu 2 Preparation method of Se thermoelectric material. Background technique [0002] In the past ten years, with the rapid population expansion and rapid industrial development, energy and environmental problems have gradually become prominent. The energy crisis and environmental crisis marked by the soaring crude oil price, excessive greenhouse gas emissions and the hole in the ozone layer have attracted increasing attention. At present, traditional energy sources such as oil, coal, and natural gas cannot meet the requirements of social and economic development. In this context, finding and developing new energy sources and new energy materials has become a research hotspot for scientists around the world. Thermoelectric materials can directly convert thermal energy into electrical energy. As an environmentally friendly material, it has important application prospects in ...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCY02P20/10
Inventor 唐新峰吴优谢文杰
Owner WUHAN UNIV OF TECH
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