CN111168006A - Preparation method of thermoelectric conversion element sheet of 3D flame electric fireplace - Google Patents
Preparation method of thermoelectric conversion element sheet of 3D flame electric fireplace Download PDFInfo
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- CN111168006A CN111168006A CN202010038037.9A CN202010038037A CN111168006A CN 111168006 A CN111168006 A CN 111168006A CN 202010038037 A CN202010038037 A CN 202010038037A CN 111168006 A CN111168006 A CN 111168006A
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- element sheet
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- thermoelectric conversion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Abstract
The invention discloses a preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace, which comprises the following steps of S1: manufacturing a mould shell according to the shape of the thermoelectric conversion element sheet of the 3D flame electric fireplace, then manufacturing a fine-hole column in the mould shell, roasting the mould shell and the fine-hole column, controlling the roasting temperature to be 800-900 ℃ and the roasting time to be 0.6-1.2 h, and forming a manufacturing mould of the thermoelectric conversion element sheet of the 3D flame electric fireplace; the present invention relates to the technical field of thermoelectric conversion element sheets. According to the preparation method of the thermoelectric conversion element sheet of the 3D flame electric fireplace, the fine-hole columns are manufactured in the die shell, after the alloy liquid is injected into the die to form the element sheet, a plurality of small holes are formed in the element sheet, the contact area between the element sheet and the outside is increased, the heat transfer efficiency is increased, the element sheet is sprayed with graphene, polystyrene, polyisoprene and bismuth telluride, and the electric conductivity of the element sheet is enhanced by utilizing the strong electric conductivity of the material.
Description
Technical Field
The invention relates to the technical field of thermoelectric conversion element sheets, in particular to a preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace.
Background
Thermoelectric conversion refers to the interconversion between thermal energy and electrical energy. Thermoelectric effects include the seebeck effect, peltier effect, thomson effect. The discovery of the thermoelectric conversion effect has attracted considerable scientific interest, since, macroscopically, the thermoelectric conversion effect means a direct conversion between thermal energy and electrical energy. How to make this effect into energy conversion and utilization in practical application. In our modern life, large-scale industrial production, transportation and small-scale daily life consume a large amount of energy everyday, but the energy is not fully utilized. In the process of energy utilization, a part of energy is not utilized and is converted into heat energy to be dissipated. This energy can be utilized by thermoelectric conversion using thermoelectric materials.
Most of the existing thermoelectric conversion element sheets of the 3D flame electric fireplace are cast by alloy liquid, the heat conduction performance and the electric conduction performance of the thermoelectric conversion element sheets are poor, the electric conductivity of the element sheets is partially enhanced by the materials, but the heat conduction performance of the thermoelectric conversion element sheets is often greatly reduced, the thermoelectric conversion efficiency of the thermoelectric conversion element sheets is influenced, and the thermoelectric conversion element sheets are not easy to popularize.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace, and solves the problems that the conventional thermoelectric conversion element sheet of the 3D flame electric fireplace has poor heat conduction and electric conduction performance, the material enhances the electric conductivity of the element sheet, and the heat conductivity is often greatly reduced.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace specifically comprises the following steps:
s1, manufacturing a mold: manufacturing a mould shell according to the shape of the thermoelectric conversion element sheet of the 3D flame electric fireplace, then manufacturing a fine-hole column in the mould shell, roasting the mould shell and the fine-hole column, controlling the roasting temperature to be 800-900 ℃ and the roasting time to be 0.6-1.2 h, and forming a manufacturing mould of the thermoelectric conversion element sheet of the 3D flame electric fireplace;
s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting;
s3, selecting a spraying material: selecting 30-40 parts of graphene, 12-15 parts of polystyrene, 15-17 parts of polyisoprene, 8-12 parts of bismuth telluride and 80-100 parts of ethanol;
s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 15-20min to form a mixed solution;
s5, spraying of element sheets: and spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 5-10min, controlling the heating temperature to be 80-100 ℃, and after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace.
Preferably, the raw materials comprise the following components: 30 parts of graphene, 12 parts of polystyrene, 15 parts of polyisoprene, 8 parts of bismuth telluride and 80 parts of ethanol.
Preferably, the raw materials comprise the following components: 35 parts of graphene, 14 parts of polystyrene, 16 parts of polyisoprene, 10 parts of bismuth telluride and 90 parts of ethanol.
Preferably, the raw materials comprise the following components: 40 parts of graphene, 15 parts of polystyrene, 17 parts of polyisoprene, 12 parts of bismuth telluride and 100 parts of ethanol.
Preferably, in the process of manufacturing the mold in S1, the diameter of the fine pore pillar is 0.5 to 0.8cm, and the fine pore pillar is uniformly distributed in the interior of the mold shell.
Preferably, when the molten alloy is cast into a mold in the step S2, the temperature of the mold is controlled to be 500-600 ℃.
Preferably, the number average molecular weight of the polystyrene in the S3 is 500-500000, and the number average molecular weight of the polyisoprene is 500-500000.
Preferably, the rotating speed of the stirring device in the S4 is controlled to be 100-120 r/min.
(III) advantageous effects
The invention provides a preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace. Compared with the prior art, the method has the following beneficial effects: the preparation method of the thermoelectric conversion element sheet of the 3D flame electric fireplace comprises the following steps of S1: manufacturing a mould shell according to the shape of the thermoelectric conversion element sheet of the 3D flame electric fireplace, then manufacturing a fine-hole column in the mould shell, roasting the mould shell and the fine-hole column, controlling the roasting temperature to be 800-900 ℃ and the roasting time to be 0.6-1.2 h, and forming a manufacturing mould of the thermoelectric conversion element sheet of the 3D flame electric fireplace; s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting; s3, selecting a spraying material: selecting 30-40 parts of graphene, 12-15 parts of polystyrene, 15-17 parts of polyisoprene, 8-12 parts of bismuth telluride and 80-100 parts of ethanol; s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 15-20min to form a mixed solution; s5, spraying of element sheets: spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 5-10min, controlling the heating temperature to 80-100 ℃, after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace, manufacturing a fine-hole column in the interior of a mold shell, injecting the alloy liquid into the mold to form the element sheet, forming a plurality of small holes in the interior of the element sheet, increasing the contact area of the element sheet and the outside, increasing the heat transfer efficiency, simultaneously spraying graphene, polystyrene, polyisoprene and bismuth telluride on the element sheet, enhancing the conductivity of the element sheet by utilizing the strong conductivity of the material, so that the thermoelectric conversion element sheet of the 3D flame electric fireplace enhances the conductivity, the heat conductivity of the thermoelectric conversion material can be improved, and the thermoelectric conversion efficiency is greatly improved.
Drawings
FIG. 1 is a flow chart of the manufacturing process of the present invention;
FIG. 2 is a graph comparing the electrical conductivity and thermal conductivity of sheets of the example and market elements of the present invention;
FIG. 3 is a graph comparing electrical conductivity and thermal conductivity of sheets of elements of the examples of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an embodiment of the present invention provides a technical solution: a method for preparing a thermoelectric conversion element sheet of a 3D flame electric fireplace,
the method specifically comprises the following embodiments:
example 1
S1, manufacturing a mold: manufacturing a mould shell according to the shape of the 3D flame electric fireplace thermoelectric conversion element sheet, then manufacturing a fine pore column in the mould shell, roasting the mould shell and the fine pore column, controlling the roasting temperature to be 800 ℃ and the roasting time to be 0.6h, and forming a manufacturing mould of the 3D flame electric fireplace thermoelectric conversion element sheet;
s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting;
s3, selecting a spraying material: selecting 30 parts of graphene, 12 parts of polystyrene, 15 parts of polyisoprene, 8 parts of bismuth telluride and 80 parts of ethanol;
s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 15min to form a mixed solution;
s5, spraying of element sheets: and spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 5min, controlling the heating temperature to be 80 ℃, and after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace.
In the present invention, in the process of manufacturing the mold in S1, the diameter of the fine pore pillars is 0.5cm, and the fine pore pillars are uniformly distributed inside the mold shell.
In the present invention, the mold temperature was controlled at 500 ℃ when the molten alloy was cast into the mold in S2.
In the present invention, the number average molecular weight of polystyrene in S3 is 500, and the number average molecular weight of polyisoprene is 500.
In the present invention, the rotation speed of the stirring apparatus in S4 is controlled to 100 r/min.
Example 2
S1, manufacturing a mold: manufacturing a mould shell according to the shape of the 3D flame electric fireplace thermoelectric conversion element sheet, then manufacturing a fine pore column in the mould shell, roasting the mould shell and the fine pore column, controlling the roasting temperature to be 850 ℃ and the roasting time to be 0.9h, and forming a manufacturing mould of the 3D flame electric fireplace thermoelectric conversion element sheet;
s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting;
s3, selecting a spraying material: selecting 35 parts of graphene, 14 parts of polystyrene, 16 parts of polyisoprene, 10 parts of bismuth telluride and 90 parts of ethanol;
s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 18min to form a mixed solution;
s5, spraying of element sheets: and spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 8min, controlling the heating temperature to be 90 ℃, and after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace.
In the present invention, in the process of manufacturing the mold in S1, the diameter of the fine pore pillars is 0.7cm, and the fine pore pillars are uniformly distributed inside the mold shell.
In the present invention, the mold temperature was controlled at 550 ℃ when the molten alloy was cast into the mold in S2.
In the present invention, the number average molecular weight of polystyrene in S3 is 400000, and the number average molecular weight of polyisoprene is 400000.
In the present invention, the rotation speed of the stirring apparatus in S4 is controlled to 110 r/min.
Example 3
S1, manufacturing a mold: manufacturing a mould shell according to the shape of the 3D flame electric fireplace thermoelectric conversion element sheet, then manufacturing a fine pore column in the mould shell, roasting the mould shell and the fine pore column, controlling the roasting temperature to be 900 ℃ and the roasting time to be 1.2h, and forming a manufacturing mould of the 3D flame electric fireplace thermoelectric conversion element sheet;
s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting;
s3, selecting a spraying material: selecting 40 parts of graphene, 15 parts of polystyrene, 17 parts of polyisoprene, 12 parts of bismuth telluride and 100 parts of ethanol;
s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 20min to form a mixed solution;
s5, spraying of element sheets: and spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 10min, controlling the heating temperature to be 100 ℃, and after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace.
In the present invention, in the process of manufacturing the mold in S1, the diameter of the fine pore pillars is 0.8cm, and the fine pore pillars are uniformly distributed inside the mold shell.
In the present invention, when the molten alloy is cast into the mold in S2, the mold temperature is controlled at 600 ℃.
In the present invention, the number average molecular weight of polystyrene in S3 was 500000, and the number average molecular weight of polyisoprene was 500000.
In the present invention, the rotation speed of the stirring apparatus in S4 is controlled to 120 r/min.
Comparative experiment
A certain 3D flame electric fireplace thermoelectric conversion element sheet manufacturer respectively selects the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the preparation process in the examples S1-S3 and the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the common preparation process to carry out comparison tests of electric conductivity and thermal conductivity, and as can be seen from the graph in FIG. 2, the electric conductivity and the thermal conductivity of the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the examples S1-S3 are 83% and 85% respectively, and the electric conductivity and the thermal conductivity of the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the common preparation process are 70% and 42% respectively, so that the electric conductivity and the thermal conductivity of the 3D flame electric fireplace thermoelectric conversion element sheet prepared by the invention are far superior to those of the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the common preparation process, and as can be seen from the graph in FIG. 3, and the electric conductivity, electric conductivity and thermal conductivity of the 3D flame electric fireplace thermoelectric conversion element sheet prepared in the example 2 are far, The thermal conductivity is the best, and is the preferred scheme; the other two are acceptable.
To sum up, through the preparation aperture post in the inside of mould shell, after the alloy liquid pours into the mould and forms the component sheet, the inside of component sheet can form a plurality of apertures, increased the area of contact of component sheet and external world, increase heat transfer efficiency, at the same time at component sheet spraying graphite alkene, polystyrene, polyisoprene and bismuth telluride, utilize the strong electric conductivity of material, strengthened the electric conductivity of component sheet, make 3D flame electric fireplace thermoelectric conversion component sheet when strengthening the electric conductivity, its heat conductivity can be promoted, very big improvement thermoelectric conversion efficiency.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of a thermoelectric conversion element sheet of a 3D flame electric fireplace is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, manufacturing a mold: manufacturing a mould shell according to the shape of the thermoelectric conversion element sheet of the 3D flame electric fireplace, then manufacturing a fine-hole column in the mould shell, roasting the mould shell and the fine-hole column, controlling the roasting temperature to be 800-900 ℃ and the roasting time to be 0.6-1.2 h, and forming a manufacturing mould of the thermoelectric conversion element sheet of the 3D flame electric fireplace;
s2, wax injection and casting: injecting wax into the element sheet die manufactured in the S1, coating a refractory material on the outer surface of the die, injecting alloy liquid of the thermoelectric conversion element sheet of the 3D flame electric fireplace into the die, and cleaning the die after the alloy liquid of the element sheet material is cooled and solidified in the die to obtain an element sheet casting;
s3, selecting a spraying material: selecting 30-40 parts of graphene, 12-15 parts of polystyrene, 15-17 parts of polyisoprene, 8-12 parts of bismuth telluride and 80-100 parts of ethanol;
s4, mixing the spraying materials: pouring ethanol into a mixing reaction kettle, sequentially adding graphene, polystyrene, polyisoprene and bismuth telluride into the mixing reaction kettle, and stirring by using a stirring device for 15-20min to form a mixed solution;
s5, spraying of element sheets: and spraying the mixed liquid formed in the step S4 on the surface of the element sheet, after the surface of the element sheet is completely sprayed, placing the element sheet in a heating furnace for heating for 5-10min, controlling the heating temperature to be 80-100 ℃, and after the mixed liquid is completely dried on the surface of the element sheet, forming the thermoelectric conversion element sheet of the 3D flame electric fireplace.
2. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: the raw materials comprise the following components: 30 parts of graphene, 12 parts of polystyrene, 15 parts of polyisoprene, 8 parts of bismuth telluride and 80 parts of ethanol.
3. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: the raw materials comprise the following components: 35 parts of graphene, 14 parts of polystyrene, 16 parts of polyisoprene, 10 parts of bismuth telluride and 90 parts of ethanol.
4. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: the raw materials comprise the following components: 40 parts of graphene, 15 parts of polystyrene, 17 parts of polyisoprene, 12 parts of bismuth telluride and 100 parts of ethanol.
5. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: in the process of manufacturing the die in the step S1, the diameter of the fine pore pillars is 0.5 to 0.8cm, and the fine pore pillars are uniformly distributed in the die shell.
6. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: and when the alloy liquid is cast into the mould in the S2, controlling the temperature of the mould to be 500-600 ℃.
7. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: the number average molecular weight of the polystyrene in the S3 is 500-500000, and the number average molecular weight of the polyisoprene is 500-500000.
8. The method for preparing a thermoelectric conversion element sheet for a 3D flame electric fireplace as claimed in claim 1, wherein: and in the step S4, the rotating speed of the stirring device is controlled to be 100-120 r/min.
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| CN202010038037.9A CN111168006A (en) | 2020-01-14 | 2020-01-14 | Preparation method of thermoelectric conversion element sheet of 3D flame electric fireplace |
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| CN202010038037.9A CN111168006A (en) | 2020-01-14 | 2020-01-14 | Preparation method of thermoelectric conversion element sheet of 3D flame electric fireplace |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165808A (en) * | 2011-12-19 | 2013-06-19 | 财团法人工业技术研究院 | Thermoelectric composite material |
| CN104115295A (en) * | 2012-02-24 | 2014-10-22 | 国立大学法人九州工业大学 | Thermoelectric conversion material |
| CN105633261A (en) * | 2016-01-04 | 2016-06-01 | 四川大学 | Photothermoelectric transform storage device and preparation method |
| CN109560186A (en) * | 2018-12-14 | 2019-04-02 | 东华大学 | A kind of N-type thermal electric film and its preparation and application |
| CN110112282A (en) * | 2019-06-17 | 2019-08-09 | 中北大学 | A kind of stealthy nanostructure of multilayer with graphene heat-conducting layer |
| CN110635019A (en) * | 2019-09-20 | 2019-12-31 | 西南大学 | Photo-thermal-electric conversion device for improving light utilization efficiency |
-
2020
- 2020-01-14 CN CN202010038037.9A patent/CN111168006A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165808A (en) * | 2011-12-19 | 2013-06-19 | 财团法人工业技术研究院 | Thermoelectric composite material |
| CN104115295A (en) * | 2012-02-24 | 2014-10-22 | 国立大学法人九州工业大学 | Thermoelectric conversion material |
| CN105633261A (en) * | 2016-01-04 | 2016-06-01 | 四川大学 | Photothermoelectric transform storage device and preparation method |
| CN109560186A (en) * | 2018-12-14 | 2019-04-02 | 东华大学 | A kind of N-type thermal electric film and its preparation and application |
| CN110112282A (en) * | 2019-06-17 | 2019-08-09 | 中北大学 | A kind of stealthy nanostructure of multilayer with graphene heat-conducting layer |
| CN110635019A (en) * | 2019-09-20 | 2019-12-31 | 西南大学 | Photo-thermal-electric conversion device for improving light utilization efficiency |
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