A method for reducing thermal conductivity of p-type ce-filled iron-based skutterudite thermoelectric materials

一种热电材料、方钴矿的技术，应用在新能源材料领域，能够解决低热导率、降低p型Ce填充铁基方钴矿热电材料热导率等问题，达到降低热导率、抑制声子输运、烧结致密度良好的效果

Active Publication Date: 2022-08-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of how to optimize the quenching temperature of p-type filled skutterudite material, and reduce the formation of impurity phases under the premise of ensuring good sintering density, thereby obtaining p-type filled skutterudite material with low thermal conductivity. A method for reducing the thermal conductivity of p-type Ce-filled iron-based skutterudite thermoelectric materials

Method used

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  • A method for reducing thermal conductivity of p-type ce-filled iron-based skutterudite thermoelectric materials
  • A method for reducing thermal conductivity of p-type ce-filled iron-based skutterudite thermoelectric materials
  • A method for reducing thermal conductivity of p-type ce-filled iron-based skutterudite thermoelectric materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] CE 1+x FE 4 SB 12 The optimization of CE element filling points consists of the following steps:

[0042](1) The initial raw material with high pure CE (99.9 % block), Fe (99 % powder) and SB (99.999 % powder), according to the chemical measurement ratio CE CE 1+x FE 4 SB 12 (X = 0.10, 0.15, 0.25 and 0.30) Implit.

[0043] (2) Mix the raw materials by hand by 10 minutes to mix it evenly. Then place the mixed powder into a clean graphite pupa; seal the graphite pupa in the quartz tube under the condition of the vacuum less than 0.1MPa, put it in the program control the temperature and melt furnace, slowly hear the heating to 1100 ° C. At this temperature, the vacuum is vacuum at this temperature. After 10 hours of melting, the melt was placed in saturated salt water and quenched to get the CE 1+x FE 4 SB 12 Casting; put the quartz -containing quenching casting blocks in the high temperature furnace at 675 ° C for 168h, and the samples of the annealing were manually grinded i...

Embodiment 2

[0045] (1) The initial raw material with high pure CE (99.9 % block), Fe (99 % powder) and SB (99.999 % powder), according to the chemical measurement ratio CE CE 1.25 FE 4 SB 12 Illects.

[0046] (2) Mix the raw materials by hand by 10 minutes to mix it evenly. Then place the mixed powder into a clean graphite pupa; seal the graphite pupa in the quartz tube under the condition that the vacuum is less than 0.1MPa, and place it in the procedure to control the warm melting furnace. After 10 hours of melting, the melt was placed in saturated salt water and quenched to get the CE 1.25 FE 4 SB 12 Casting; put the quartz -containing quenching casting blocks in the high temperature furnace at 675 ° C for 168h, and the samples of the annealing were manually grinded into fine powder.

[0047] (3) The annealing powder after the optimization of the step (2) obtained by the optimization score is burned with a discharge plasma sintering method in the vacuum. The sintering temperature is 500 ° ...

Embodiment 3

[0050] In this embodiment, the method of reducing the heat guidance rate of the CE -type CE -filled iron -filled iron -filled iron -filled cobalt mine thermal power material, except for changes in quenching temperature, the remaining preparation methods are the same as the embodiment 2, the quenching temperature increases to 1000 ° C.

[0051] The results of the powder X-ray diffraction analysis of the sarcasm show that the main phase of the sintering body is a cobalt mines, which contains more FESB 2 In the sb impurities, such as Figure 5 A shown. Compared with Example 2, impurities have decreased slightly. The BEI diagram of the light surface and EDS energy spectrum are the same as the XRD analysis results, such as Figure 5 C shown in. The SEI diagram of the light surface shows that the surface of the sample is relatively flat, and there are a small amount of hole structure, such as Figure 5 b.

[0052] The thermal conductivity of the block material after the SPS sintering was t...

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Abstract

The invention relates to the field of new energy materials, in particular to a method for reducing the thermal conductivity of p-type Ce-filled iron-based skutterudite thermoelectric materials. 1+x Fe 4 Sb 12 After weighing, mix evenly by hand; place the mixed powder in a clean graphite crucible, seal the graphite crucible in a quartz tube under vacuum to obtain a quartz ampoule; place the obtained quartz ampoule in a high-temperature furnace, and slowly heat up To the quenching temperature, after vacuum melting, the melt is quenched in saturated brine and then placed in a high-temperature furnace to continue annealing, and the annealed samples are manually ground to obtain powder; the obtained powder is sintered by spark plasma to obtain Ce with low thermal conductivity 1.25 Fe 4 Sb 12 Material. Ce prepared by optimizing Ce atomic filling fraction and quenching temperature 1.25 Fe 4 Sb 12 The material has good density, porous structure and less impurity phase, this porous structure and less impurity phase make Ce 1.25 Fe 4 Sb 12 The material has very low thermal conductivity.

Description

Technical field [0001] The invention involves the field of new energy materials, which specifically involves a method to reduce the thermal guidance rate of the CE -filled iron -filled cobalt ore cobalt ore. Background technique [0002] Thermal power material is a new energy material that can realize the direct conversion of thermal and electrical energy, which can be used for power generation and refrigeration. The thermoelectric component made of thermoelectric materials is a full solid energy conversion device with many advantages that other energy conversion devices do not have, such as small volume, simple structure, no noise, high reliability, long life, environment -friendly and applicable temperature range Guangwen plays an important role in the fields of aerospace, military, medicine and microelectronics. [0003] The performance of the thermal power materials is comprehensive by the unblied super -value ZT. The larger the ZT value, the higher the thermoelectric convers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C12/00C22C1/02C22C1/04B22F9/04C22F1/16
CPCC22C12/00C22C1/007C22C1/02C22C1/04B22F9/04C22F1/002C22F1/16
Inventor 刘志愿童鑫朱江龙夏爱林
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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