CN100394625C - Flow guiding electrode for temperature difference generator and its preparing method - Google Patents
Flow guiding electrode for temperature difference generator and its preparing method Download PDFInfo
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- CN100394625C CN100394625C CNB2004100939590A CN200410093959A CN100394625C CN 100394625 C CN100394625 C CN 100394625C CN B2004100939590 A CNB2004100939590 A CN B2004100939590A CN 200410093959 A CN200410093959 A CN 200410093959A CN 100394625 C CN100394625 C CN 100394625C
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- guiding electrode
- temperature difference
- difference generator
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Abstract
The present invention relates to a flow guiding electrode for a temperature difference generator and a preparing method thereof. The flow guiding electrode is characterized in that base powder material and transient active material are stack pressed together in a layered mode, which forms the flow guiding electrode for a temperature difference generator. The preparing method is that the base powder material and the transient active material are respectively ground and screened; the transient active material which is ground and screened is put in a mould and is pressed, the base powder material is put into the mould to be pressed, and the flow guiding electrode for a temperature difference generator is formed in a pressing mode according to the order; the flow guiding electrode for a temperature difference generator, which is pressed, is taken out, sintered, preserved with heat, annealinged and cooled, and then, the flow guiding electrode for a temperature difference generator is taken out to be the final flow guiding electrode for a temperature difference generator. The flow guiding electrode prepared by the method has the advantages of little welding resistance, high welding strength, good welding wettability, long service time, low cost, and large current density of battery discharge. The thermoelectric conversion efficiency is enhanced.
Description
Technical field
The invention belongs to the thermoelectric technical field, particularly relate to a kind of flow guiding electrode for temperature difference generator and preparation method thereof.
Background technology
At present, the flow guiding electrode that thermoelectric generator is used is generally metal materials such as single Fe, Cu, Ni, tailors slabbing.Its weak point is: welding resistance is big, weld strength is not high, the situation that thermoelectric material and electrode come off appears in thermoelectric generator vibratory impulse process easily, and the thermoelectric generator that works long hours under big temperature gradient decay is fast, life-span is short, and this also is one of low reason of the conversion efficiency of thermoelectric generator.
Summary of the invention
The present invention provides a kind of flow guiding electrode for temperature difference generator and preparation method thereof for solving problems of the prior art.
It is little to the purpose of this invention is to provide a kind of welding resistance, the weld strength height, and the welding wettability is good, and the life-span is long, and cost is low, a kind of flow guiding electrode for temperature difference generator that battery discharge current density is big and preparation method thereof.
The present invention adopts following technical scheme:
A kind of flow guiding electrode for temperature difference generator is characterized in: matrix powder material and transition active material are divided laminated together, constitute flow guiding electrode for temperature difference generator; Described matrix powder material is single metal dust, and described transition active material reaches above metal powder mixture for one or both.
A kind of preparation method of flow guiding electrode for temperature difference generator, it comprises following technical process:
(1) matrix powder material and the transition active material with described ratio grinds respectively, sieves;
(2) the described transition active material after will grinding, sieving is put into mould and is suppressed, and puts into the matrix powder material then and suppresses, and order is pressed into described flow guiding electrode for temperature difference generator according to this;
(3) flow guiding electrode for temperature difference generator after the taking-up compacting carries out sintering, insulation, annealing, cooling, becomes final flow guiding electrode for temperature difference generator after the taking-up.
The present invention can also adopt following technical measures to realize:
Flow guiding electrode for temperature difference generator is characterized in: described matrix powder material is Fe powder, Cu powder, Ni powder; Described transition active material is one or more a mixture in a kind of or described matrix powder material and SnTe powder, Cu powder, Zn powder and the Ag powder in SnTe powder, Cu powder, Zn powder and the Ag powder, the matrix powder material content is 50～90% in the described flow guiding electrode, and the transition active material content is 10～50% in the described flow guiding electrode.
Flow guiding electrode for temperature difference generator is characterized in: described transition active material SnTe: Cu: Zn: the Ag percentage by weight is 10～50%: 20～30%: 10～15%: 10～50%.
Flow guiding electrode for temperature difference generator is characterized in: described flow guiding electrode for temperature difference generator is two-layer above shade structure, and described shade structure is the cylinder that outer shape is half hollow, leaves thin-walled all around, and the bottom is provided with the shade shape of groove.
The manufacture method of flow guiding electrode for temperature difference generator is characterized in: described sintering process is carried out in protective gas.
The manufacture method of flow guiding electrode for temperature difference generator is characterized in: described protective gas is that quartz ampoule vacuumizes, and pours Ar: H again
2It is 1: 1 mist.
The manufacture method of flow guiding electrode for temperature difference generator is characterized in: the number of times at least twice of described sintering, insulation, annealing, cooling.
The manufacture method of flow guiding electrode for temperature difference generator; be characterized in: after described at least twice sintering, insulation, annealing, the cooling; be warming up to required sintering temperature again; after the insulation,, and then carry out intermediate sintering temperature one time with the stove cooling; behind the intermediate sintering temperature; flow guiding electrode is put into the graphite box again and poured protective gas, be warming up to required annealing temperature, cool off with stove the insulation back.
The manufacture method of flow guiding electrode for temperature difference generator is characterized in: described annealing temperature is 800～1100 ℃, and annealing time is half an hour.
Advantage and good effect that the present invention has are: because electrode has adopted the matrix powder material through grinding, sieving, improved the compactness of electrode, increased the wetability of scolder between material and flow guiding electrode, reduced welding resistance, battery discharge current density is improved; Because electrode has adopted the shade structure, has increased area between thermoelectric material and the flow guiding electrode, has improved weld strength; Owing to adopted the method for matrix powder and the layering of transition active material compacting, not only increased the contact area of flow guiding electrode and thermoelectric material, play the effect of serving as transition zone and barrier layer simultaneously, alleviated the influence of thermal shock, stopped that the harmful element in the electrode spreads in thermoelectric material thermoelectric generator.
Description of drawings
Fig. 1 is the mould semi-section schematic diagram of preparation flow guiding electrode for temperature difference generator of the present invention.
Fig. 2 is the profile of inner core in the mould of Fig. 1 flow guiding electrode.
Fig. 3 is the schematic diagram of flow guiding electrode for temperature difference generator of the present invention.
Label among the figure is respectively: 1. pressure head, and 2. former, 3. flow guiding electrode material, 4. inner core is 5. framed, 6. backing plate, 7 blanking frames.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. is described in detail as follows:
Embodiment 1: with reference to accompanying drawing 1-3, in pressing process, at first pressure head 1, former 2, inner core 4 and framed 5 are cleaned up.Wherein the diameter of inner core 4 is consistent with the diameter of employed thermoelectric material, and it is shaped as cylinder, and an end face has several the circular grooves that specially process, and becomes an angle of 90 degrees in the bottom of circular groove, it and framed 5 closely cooperate.After inner core 4 puts into framed 5, its top is than framed 5 height, it is decided on the height of the required shade of flow guiding electrode, the height of general shade is 1mm, described shade is the cylinder that outer shape shown in Figure 3 is half hollow, leave thin-walled all around, the bottom is provided with the shade shape of groove, puts in the lump in the former 2 again.After former 2 put into horizontal level, earlier will be by SnTe: Cu: Zn: the Ag percentage by weight is 10～50%: 20～30%: 10～15%: 10～50% load weighted transitional materials that mix and active material be put into former 2, rap former 2, make transitional material and active matter mass-energy be tiled in uniformly in the former 2, pressure head 1 is put into former 2, and then former 2 is placed on the backing plate 6, give a little bit smaller slightly pressure of pressure head 1, pressurize 5 seconds, then pressure head 1 is taken out, again load weighted basis material is put into former 2, rap former 2, make basis material be tiled in uniformly on transitional material and the active material, again former 2 is placed on the backing plate 6, give pressure head 1 certain pressure, pressurize 30 seconds is taken off former 2 again from backing plate 6, be placed on the blanking frame 7, carry out the demoulding for certain pressure, whole like this pressing process finishes again.Compacting will be carried out the multiple high temp sintering with the flow guiding electrode of being suppressed after finishing, and for guaranteeing that flow guiding electrode is not oxidized in the sintering process, whole sintering process will be carried out in protective gas.Earlier flow guiding electrode is put into quartz ampoule, vacuumize, pour Ar: H again
2=1: 1 mist after three times, is warming up to 800～1100 ℃ and carries out sintering so back and forth, then insulation and cool off with stove.And then carry out intermediate sintering temperature one time, and to reduce the internal stress in the high-temperature sintering process, the flow guiding electrode behind the sintering is put into the graphite box pour protective gas, be warming up to 500～800 ℃ and anneal, insulation is cold with stove after half an hour.So just made our required flow guiding electrode.
Claims (10)
1. flow guiding electrode for temperature difference generator is characterized in that: matrix powder material and transition active material are divided laminated together, constitute flow guiding electrode for temperature difference generator; Described matrix powder material is single metal dust, and described transition active material reaches above metal powder mixture for one or both.
2. flow guiding electrode for temperature difference generator according to claim 1 is characterized in that: described matrix powder material is Fe powder, Cu powder, Ni powder; Described transition active material is one or more a mixture in a kind of or described matrix powder material and SnTe powder, Cu powder, Zn powder and the Ag powder in SnTe powder, Cu powder, Zn powder and the Ag powder, the matrix powder material content is 50～90% in the described flow guiding electrode, and the transition active material content is 10～50% in the described flow guiding electrode.
3. flow guiding electrode for temperature difference generator according to claim 1 is characterized in that: described transition active material SnTe: Cu: Zn: the Ag percentage by weight is 10～50%: 20～30%: 10～15%: 10～50%.
4. flow guiding electrode for temperature difference generator according to claim 1, it is characterized in that: described flow guiding electrode for temperature difference generator is two-layer above shade structure, described shade structure is the cylinder that outer shape is half hollow, leaves thin-walled all around, and the bottom is provided with the shade shape of groove.
5. method of making the described flow guiding electrode for temperature difference generator of claim 1, it is characterized in that: it comprises following technical process:
(1) matrix powder material and the transition active material with described ratio grinds respectively, sieves;
(2) the described transition active material after will grinding, sieving is put into mould and is suppressed, and puts into the matrix powder material then and suppresses, and order is pressed into described flow guiding electrode for temperature difference generator according to this;
(3) flow guiding electrode for temperature difference generator after the taking-up compacting carries out sintering, insulation, annealing, cooling, becomes final flow guiding electrode for temperature difference generator after the taking-up.
6. the manufacture method of flow guiding electrode for temperature difference generator according to claim 5, it is characterized in that: described sintering process is carried out in protective gas.
7. the manufacture method of flow guiding electrode for temperature difference generator according to claim 6, it is characterized in that: described protective gas is that quartz ampoule vacuumizes, and pours Ar: H again
2It is 1: 1 mist.
8. the manufacture method of flow guiding electrode for temperature difference generator according to claim 5 is characterized in that: the number of times twice of described sintering, insulation, annealing, cooling at least.
9. the manufacture method of flow guiding electrode for temperature difference generator according to claim 8; it is characterized in that: after described at least twice sintering, insulation, annealing, the cooling; be warming up to required sintering temperature again; after the insulation,, and then carry out intermediate sintering temperature one time with the stove cooling; behind the intermediate sintering temperature; flow guiding electrode is put into the graphite box again and poured protective gas, be warming up to required annealing temperature, cool off with stove the insulation back.
10. the manufacture method of flow guiding electrode for temperature difference generator according to claim 9, it is characterized in that: described annealing temperature is 800～1100 ℃, annealing time is half an hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100939590A CN100394625C (en) | 2004-12-14 | 2004-12-14 | Flow guiding electrode for temperature difference generator and its preparing method |
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| CNB2004100939590A CN100394625C (en) | 2004-12-14 | 2004-12-14 | Flow guiding electrode for temperature difference generator and its preparing method |
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| CN100394625C true CN100394625C (en) | 2008-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102528033B (en) * | 2010-12-24 | 2014-10-15 | 中国电子科技集团公司第十八研究所 | Preparation method of functional gradient thermoelectric material |
| CN103579483A (en) * | 2013-11-05 | 2014-02-12 | 姚芸 | Metallic conductor electrode for thermoelectric generator and preparation method thereof |
| CN103579489A (en) * | 2013-11-05 | 2014-02-12 | 姚芸 | Preparation method of metallic conductor electrode for thermoelectric generator |
| CN103579484A (en) * | 2013-11-05 | 2014-02-12 | 姚芸 | Metallic conductor electrode for thermoelectric generator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003017766A (en) * | 2001-07-04 | 2003-01-17 | Seiko Instruments Inc | Method of fabricating thermo-electric element |
| CN2602186Y (en) * | 2002-09-24 | 2004-02-04 | 中国科学技术大学 | Semiconductive temperature difference power generating and hydrogen production apparatus using cold energy of liquefied natural gas |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003017766A (en) * | 2001-07-04 | 2003-01-17 | Seiko Instruments Inc | Method of fabricating thermo-electric element |
| CN2602186Y (en) * | 2002-09-24 | 2004-02-04 | 中国科学技术大学 | Semiconductive temperature difference power generating and hydrogen production apparatus using cold energy of liquefied natural gas |
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