CN102528033B - Preparation method of functional gradient thermoelectric material - Google Patents
Preparation method of functional gradient thermoelectric material Download PDFInfo
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- CN102528033B CN102528033B CN201010604927.8A CN201010604927A CN102528033B CN 102528033 B CN102528033 B CN 102528033B CN 201010604927 A CN201010604927 A CN 201010604927A CN 102528033 B CN102528033 B CN 102528033B
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Abstract
The invention relates to a preparation method of a functional gradient thermoelectric material, comprising the steps of: (1) respectively smelting two kinds of alloy materials with the approximate melting points in an intermediate frequency furnace; (2) crushing the two kinds of alloy materials in the step (1) into powder, sieving with a 80-240 mesh sieve; (3) selecting parts of the two kinds of powders after sieving in the step (2) and mixing according to a mass ratio of 1:1, mixing in a mortar into uniformly mixed powder as a transitional powder; (4) adding the transitional powder in the step (3) between the two kinds of powders after sieving in the step (2), and placing into a graphite mold; (5) performing hot press or plasma spark sintering on the graphite mold in the step (4); and (6) after pressing is finished, taking out the mold after the temperature of a hot pressing furnace drops to room temperature, and demolding with a jack to take out the material, namely the functional gradient thermoelectric material. The functional gradient thermoelectric material has the characteristics of low overall resistance, high electrical property, no toxicity of thermoelectric property and reliability of long term operation.
Description
Technical field
The invention belongs to thermoelectric technical field, particularly relate to a kind of preparation method of functional gradient thermoelectric material.
Background technology
Thermoelectric cell is a kind of energy conversion device that electric energy can be directly changed into heat energy, is made up of thermal source and thermoelectric power generation device.This kind of battery has compact conformation, there is no moving component, reliability is high, be not subject to the features such as environmental influence.Scientists is all at the conversion efficiency of thermoelectric of being devoted to further to improve this battery both at home and abroad, and the main approach that improves battery conversion efficiency is exactly to improve the thermoelectricity capability of the thermoelectric material of its use, make as far as possible every kind of material all in best warm area work, thermoelectric material in whole operating temperature range in optimum value, and then make make battery reach on the whole higher conversion efficiency.
In recent years, the concept of FGM is introduced into thermoelectric field, makes entirety by the thermoelectric material of multiple different components.
At present, adopt soldering processes that the block thermoelectric material of molded different components is linked together, the selection of brazing filler metal material is taking the serviceability temperature that meets soldering point as prerequisite more, and the temperature of brazing filler metal simultaneously will be lower than the softening point temperature of bi-material.Although realizing different materials, this method becomes entirety, but produce brazing filler metal contact resistance at different components storeroom, and then cause the FGM overall electrical resistance of preparation to increase, electrical property decreases, and use solder also likely the performance of thermoelectric own to be produced and poisoned, affect the reliability of its long-term work.
Summary of the invention
The object of the invention is to solve above-mentioned existing issue, propose that overall electrical resistance is little, electrical property is high, the performance of thermoelectric own is without poisoning, and a kind of functional gradient thermoelectric material preparation method of the reliability of long-term work.
The object of the invention is to realize by following scheme:
Functional gradient thermoelectric material preparation method, is characterized in: step is:
Step is (1): in intermediate frequency furnace, melt out respectively two kinds of alloy materials of the approaching PbSnTe of fusing point and GeTe;
Step is (2): by step (1) in PbSnTe and two kinds of alloy materials of GeTe be broken into powder, sieve with 80-240 object mesh sieve;
Step is (3): the PbSnTe after selecting step sieves in (2) and two kinds of powder of GeTe part in mass ratio 1:1 mix, and is mixed into uniform mixed-powder as transition material with mortar;
Step is (4): between the PbSnTe after sieving in (2) by step and two kinds of powder of GeTe, add the transition powder of step in (3) to insert in graphite jig, described graphite jig forms by cavity with lower lock block and the upper holder block of the internal diameter interference fits of cavity;
Step is (5): by step (4) in graphite jig carry out hot pressing or spark plasma sintering; Described hot pressing is that the hot pressing furnace that graphite jig is put into vacuum or inert gas carries out forming and sintering, when furnace body temperature reaches after 500 DEG C-520 DEG C, and point three pressurizations, be pressurised into first 1.2T, be pressurised into for the second time 2.1T, be pressurised into for the third time 3T, each dwell time is 30min;
Step is (6): after compacting finishes, treat that hot pressing furnace temperature is down to room temperature, take out mould, take out material with the jack demoulding, make functional gradient thermoelectric material of the present invention.
And described step (2) middle mesh sieve is 120 orders.
Advantage of the present invention and good effect are:
1, the present invention adopts powder metallurgy forming sintering method that different component thermoelectric material approaching fusing point is compressed to entirety, do not increasing material monolithic resistance and do not introducing under the prerequisite of other materials composition, significantly improving thermoelectricity capability and the stability of thermoelectric material.
2, the present invention has that overall electrical resistance is little, electrical property is high, the performance of thermoelectric own is without poisoning, and the feature of the reliability of long-term work.
Brief description of the drawings
Fig. 1 alloy powder dress of the present invention mould schematic diagram.
In figure, 1-upper holder block, 2-cavity, 3-GeTe alloy material, 4-transition material, 5-PbSnTe alloy material, 6-upper holder block, 7-graphite jig.
Detailed description of the invention
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of functional gradient thermoelectric material preparation method, step is:
Step is (1): in intermediate frequency furnace, melt out respectively PbSnTe alloy material 5 and GeTe alloy material 3;
Step: in will be (1), PbSnTe and GeTe alloy material be broken into powder, sieves with 120 mesh sieves;
Step is (3): the part PbSnTe after sieving in choosing (2) and GeTe powder in mass ratio 1:1 mix, and will be mixed into uniform mixed-powder as transition material 4 with mortar;
Step is (4): by the PbSnTe powder after sieving in (2), (3) in transition zone and (2) in GeTe powder after sieving put into successively from bottom to top graphite jig 7;
Step is (5): in will be (4), graphite jig be put into hot pressing furnace and carried out forming and sintering, when furnace body temperature reaches after 500 DEG C-520 DEG C, and point three pressurizations, pressure is followed successively by 1.2T, 2.1T and 3T, each dwell time is 30min;
Step is (6): after compacting finishes, treat that hot pressing furnace temperature is down to 25 DEG C, take out mould, take out material with the jack demoulding, make functional gradient thermoelectric material of the present invention.
Described graphite jig forms by cavity 2 with lower lock block 6 and the upper holder block 1 of the internal diameter interference fits of cavity.
Operation principle of the present invention:
The present invention approaches material according to fusing point can be in principle close or uniform temp forming and sintering, adopts powder metallurgy forming sintering method that different component thermoelectric material approaching fusing point is compressed to entirety, forms component function gradient thermoelectric material.Do not increasing material monolithic resistance and do not introducing under the prerequisite of other materials composition, significantly improving thermoelectricity capability and the stability of thermoelectric material.
Claims (2)
1. a functional gradient thermoelectric material preparation method, is characterized in that: step is:
Step is (1): in intermediate frequency furnace, melt out respectively two kinds of alloy materials of the approaching PbSnTe of fusing point and GeTe;
Step is (2): by step (1) in PbSnTe and two kinds of alloy materials of GeTe be broken into powder, sieve with 80-240 object mesh sieve;
Step is (3): the PbSnTe after selecting step sieves in (2) and two kinds of powder of GeTe part in mass ratio 1:1 mix, and is mixed into uniform mixed-powder as transition material with mortar;
Step is (4): between the PbSnTe after sieving in (2) by step and two kinds of powder of GeTe, add the transition powder of step in (3) to insert in graphite jig, described graphite jig forms by cavity with lower lock block and the upper holder block of the internal diameter interference fits of cavity;
Step is (5): by step (4) in graphite jig carry out hot pressing or spark plasma sintering; Described hot pressing is that the hot pressing furnace that graphite jig is put into vacuum or inert gas carries out forming and sintering, when furnace body temperature reaches after 500 DEG C-520 DEG C, and point three pressurizations, be pressurised into first 1.2T, be pressurised into for the second time 2.1T, be pressurised into for the third time 3T, each dwell time is 30min;
Step is (6): after compacting finishes, treat that hot pressing furnace temperature is down to room temperature, take out mould, take out material with the jack demoulding, make functional gradient thermoelectric material of the present invention.
2. functional gradient thermoelectric material preparation method according to claim 1, is characterized in that: described step (2) middle mesh sieve is 120 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010604927.8A CN102528033B (en) | 2010-12-24 | 2010-12-24 | Preparation method of functional gradient thermoelectric material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010604927.8A CN102528033B (en) | 2010-12-24 | 2010-12-24 | Preparation method of functional gradient thermoelectric material |
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| CN102528033A CN102528033A (en) | 2012-07-04 |
| CN102528033B true CN102528033B (en) | 2014-10-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105970013B (en) * | 2016-05-04 | 2018-01-02 | 上海大学 | Silumin constructional gradient material high flux preparation facilities and method are used in encapsulation |
| CN110465664B (en) * | 2019-08-12 | 2021-07-20 | 江苏大学 | Combined type discharge plasma sintering mold for preparing gradient porous composite material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790763A (en) * | 2004-12-14 | 2006-06-21 | 中国电子科技集团公司第十八研究所 | Flow guiding electrode for temperature difference generator and its preparing method |
| CN1978099A (en) * | 2005-12-07 | 2007-06-13 | 中国电子科技集团公司第十八研究所 | PbTe powde material formation preparing method |
| CN101199997A (en) * | 2006-12-15 | 2008-06-18 | 中国电子科技集团公司第十八研究所 | Preparing process for thermoelectric integration monomer material |
| CN101736172A (en) * | 2010-01-08 | 2010-06-16 | 武汉理工大学 | Preparation method of SiGe alloy thermoelectric material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0790317A (en) * | 1993-09-20 | 1995-04-04 | Kubota Corp | Hot isostatic pressing sintering method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790763A (en) * | 2004-12-14 | 2006-06-21 | 中国电子科技集团公司第十八研究所 | Flow guiding electrode for temperature difference generator and its preparing method |
| CN1978099A (en) * | 2005-12-07 | 2007-06-13 | 中国电子科技集团公司第十八研究所 | PbTe powde material formation preparing method |
| CN101199997A (en) * | 2006-12-15 | 2008-06-18 | 中国电子科技集团公司第十八研究所 | Preparing process for thermoelectric integration monomer material |
| CN101736172A (en) * | 2010-01-08 | 2010-06-16 | 武汉理工大学 | Preparation method of SiGe alloy thermoelectric material |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平7-90317A 1995.04.04 |
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