CN115884450A - Aluminum-based heating unit and preparation method thereof - Google Patents
Aluminum-based heating unit and preparation method thereof Download PDFInfo
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- CN115884450A CN115884450A CN202211729999.4A CN202211729999A CN115884450A CN 115884450 A CN115884450 A CN 115884450A CN 202211729999 A CN202211729999 A CN 202211729999A CN 115884450 A CN115884450 A CN 115884450A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention provides an aluminum-based heating unit and a preparation method thereof, and relates to the technical field of automobile parts. The aluminum-based heating unit comprises an aluminum substrate, fins and a screen printing layer, wherein the screen printing layer is arranged on one side of the substrate, and the fins are arranged on the other side of the substrate. The aluminum-based heating unit adopts the aluminum material as the substrate, so that the heat conduction performance is better, and the heat dissipation efficiency is improved. Meanwhile, the fins are arranged on the aluminum substrate, so that the heat dissipation area is increased, the heat dissipation efficiency is further improved, and the situations of thermal breakdown or thermal failure and the like caused by overhigh surface temperature of the heating element are avoided. The aluminum base plate and the fins are integrally formed by adopting an extrusion process, so that the problems of difficulty in ensuring the strength, inconsistent brazing quality and the like caused by a brazing process are avoided, the process is simplified, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to an aluminum-based heating unit and a preparation method thereof.
Background
Thick film heating technology is widely used due to its high heat transfer efficiency, such as in the automotive heater field. The thick film heater is a heating device formed by printing an insulating medium layer, a heating resistor layer, a conductor layer and an insulating protective layer on a substrate through a screen printing process and sintering at high temperature. The existing thick film heater usually adopts stainless steel, ceramic and other materials as a substrate, but the surface temperature of a heating element is higher due to the general heat conducting property of the stainless steel substrate, so that thermal breakdown and thermal failure are easy to generate.
Disclosure of Invention
The invention aims to solve the problems that the surface temperature of a heating element is higher, and thermal breakdown and thermal failure are easy to generate due to the adoption of materials such as stainless steel, ceramics and the like as a substrate.
To solve the above problems, the present invention provides an aluminum-based heating unit comprising: the aluminum base plate, fin and screen printing layer, one side of base plate sets up the screen printing layer, the opposite side of base plate sets up the fin.
Preferably, the fins are arranged on the base plate at intervals, and the distance between every two fins is 0.5-0.8mm.
Preferably, the thickness of the fin is 0.8-1mm.
Preferably, the width to height ratio of the fins is greater than 1.
Preferably, the screen printing layer includes an insulating layer, a resistive layer, a conductive layer and a protective layer sequentially disposed on the surface of the substrate.
Preferably, the screen printing layer further includes a temperature sensing layer, and the temperature sensing layer is disposed between the resistive layer and the protective layer, and between the conductive layer and the protective layer.
The advantages of the aluminium-based heating unit of the invention over the prior art are:
the aluminum-based heating unit adopts the aluminum material as the substrate, so that the heat conduction performance is better, and the heat dissipation efficiency is improved. Meanwhile, the fins are arranged on the aluminum substrate, so that the heat dissipation area is increased, the heat dissipation efficiency is further improved, and the situations of thermal breakdown or thermal failure and the like caused by overhigh surface temperature of the heating element are avoided.
The invention also provides a preparation method of the aluminum-based heating unit, which comprises the following steps:
integrally forming a base plate with fins by adopting an aluminum material by using an extrusion process;
and preparing a screen printing layer on the substrate by using a screen printing process.
Preferably, the preparing the screen printing layer on the substrate by using the screen printing process includes:
preparing insulating slurry, printing the insulating slurry on the surface of the substrate through a screen printing process, and sintering to obtain an insulating layer;
preparing conductive paste, printing the conductive paste on the surface of the insulating layer by a screen printing process, and sintering to obtain a resistance layer and a conductor layer;
preparing protective layer slurry, printing the protective layer slurry on the surfaces of the resistance layer and the conductor layer by a screen printing process, and sintering to obtain a protective layer;
preferably, the preparing a screen printing layer on the substrate by using a screen printing process further comprises: preparing zirconia-based slurry, printing the zirconia-based slurry between the resistance layer, the conductor layer and the protection layer through a screen printing process, and sintering to obtain the temperature sensing layer.
Preferably, the temperature of the sintering treatment is 490-510 ℃.
Compared with the prior art, the preparation method of the aluminum-based heating unit has the advantages that:
according to the invention, the aluminum base plate and the fins are integrally formed by adopting an extrusion process, the base plate and the fins are both made of aluminum materials and are integrally formed by the extrusion process, so that the complex processes of machining and forming the fins, brazing the fins on the base plate and the like are omitted, the process is simplified, and the cost is reduced; and the fins and the base plate are integrally extruded and molded, so that the problems of difficulty in ensuring the strength, inconsistent brazing quality and the like caused by a brazing process are avoided.
Drawings
FIG. 1 is a schematic structural diagram of an aluminum-based heating unit according to an embodiment of the present invention.
Description of reference numerals:
1-a substrate; 2-an insulating layer; 3-a resistive layer and a conductive layer; 4-a protective layer; 5-a temperature sensing layer; 6-fins.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The aluminum-based heating unit comprises an aluminum substrate 1, fins 6 and a screen printing layer, wherein the screen printing layer is arranged on one side of the substrate 1, and the fins 6 are arranged on the other side of the substrate 1.
In the aluminum-based heating unit of the present embodiment, the aluminum substrate 1 is used as the substrate 1, the thermal conductivity of the aluminum substrate 1 is 10 times that of the stainless substrate 1, and for example, the thermal conductivity of Al 3003/6003 is 226W/(m · K), while the thermal conductivity of stainless steel (SUS) 430 is 26W/(m · K). Meanwhile, the fins are arranged on the aluminum substrate to increase the heat dissipation area. In the embodiment, the aluminum substrate and the fins arranged on the aluminum substrate are used for improving the heat dissipation efficiency together, and the situations of thermal breakdown or thermal failure and the like caused by overhigh surface temperature of the heating element are avoided.
In some embodiments, the base plate 1 and the fins 6 are integrally formed by an extrusion process using an aluminum material.
The base plate 1 of this embodiment is because it is made to adopt aluminium extrusion technology, consequently, when processing the base plate, can go out the fin by integrated into one piece on the base plate, not only simplify the technology, and integrated into one piece's fin compares the fin of welding on the base plate, and joint strength is higher, and the welding fin still appears welding quality inconsistent, appears the rosin joint scheduling problem easily.
Therefore, in the embodiment, the aluminum base plate 1 and the fins 6 are integrally formed by adopting an extrusion process, complex processes such as a machining forming process of the fins 6 and brazing of the fins 6 are omitted, and the fins 6 and the base plate 1 are integrally extruded, so that the problems of difficulty in ensuring the strength, inconsistent brazing quality and the like caused by the brazing process are avoided, the process is simplified, and the cost is reduced.
In some embodiments, the fins 6 obtained by extrusion molding are distributed on the base plate 1 at intervals of 0.5 to 0.8mm. Experiments show that the distance between the fins 6 is set within the range of 0.5-0.8mm, the extrusion process is not influenced, the heat dissipation area is large, and the heat dissipation efficiency is improved. Further, the thickness of the fin 6 is 0.8-1mm, and the width-to-height ratio of the fin 6 is greater than 1. It will be appreciated that the base plate 1 is generally rectangular, the fins 6 are spaced apart along the length of the base plate 1, the dimension of a single fin 6 along the length of the base plate 1 is the width of the fin 6, the distance between the end of the fin 6 and the base plate 1 is the height of the fin 6, and the dimension of the fin 6 along the width of the base plate 1 is the thickness of the fin 6.
According to the invention, the width-height ratio of the fins 6 is set to be more than 1 and 5, and the distance between the fins 6 is 0.5-0.8mm, so that the extruded fins 6 are in a strip shape, which is beneficial to increasing heat dissipation, and meanwhile, the problems of easy breakage and the like caused by overlong fins 6 are avoided.
In some embodiments, as shown in fig. 1, the screen printing layer includes an insulating layer 2, a resistive layer, a conductive layer 3 and a protective layer 4 sequentially disposed on the surface of the substrate 1. The insulating layer 2, the resistance layer, the conductor layer 3 and the protective layer 4 are formed by adopting low-temperature slurry to perform screen printing and then sintering. The sintering temperature of the low-temperature slurry is 490-510 ℃, which is lower than the melting point temperature of 660 ℃ of aluminum, thereby avoiding the damage to the aluminum substrate 1 when sintering the silk screen printing layer.
In some embodiments, the screen printing layer further includes a temperature sensing layer 5, and the temperature sensing layer 5 is disposed between the resistance layer and the conductor layer 3 and the protection layer 4. Compared with the temperature sensor which can only detect certain point positions, the whole heating surface can be detected by arranging the whole temperature sensing layer 5 between the resistance layer and the conductor layer 3 as well as the protection layer 4, and the distribution of all hot points is ensured to be detected.
According to the embodiment, the thermal damage caused by random hot spots of the aluminum-based heating unit can be effectively prevented by screen printing of the temperature sensing layer.
In some embodiments, the temperature sensing layer 5 comprises a zirconia-based material. The temperature sensing layer 5 with zirconia base is printed by a silk screen, and the temperature sensing layer 5 can generate electric signals when the temperature reaches over 600 ℃ by utilizing the characteristics of insulation at low temperature and electric conduction at high temperature, thereby effectively detecting the distribution of high-temperature hot spots.
In some embodiments, the insulating layer 2, the resistance layer and the conductor layer 3, the temperature sensing layer 5 and the protection layer 4 are sequentially sintered on the surface of the substrate 1 by a non-co-firing method. Specifically, firstly, an insulating layer 2 is screen-printed on the surface of an aluminum substrate 1, then sintering is carried out, 4-5 layers of sintered insulating layers 2 are printed in consideration of the subsequent 800V platform high voltage withstand requirement, then a resistance layer, a conductor layer 3, a temperature sensing layer 5 and a protection layer 4 are sequentially printed and sintered, sintering is carried out once every printing, and the sintering temperature is 490-510 ℃.
In the embodiment, the screen printing layer is prepared on the surface of the substrate 1 by the screen printing technology, and the thickness of the screen printing layer is controlled to be less than 0.5 mm.
In some embodiments, the aluminum-based heating unit further includes a sealing layer, and the sealing layer is coated outside the screen printing layer to protect the screen printing layer. The sealing layer can be made of resin materials.
The embodiment of the invention also provides a preparation method of the aluminum-based heating unit, which comprises the following steps:
integrally forming a base plate with fins by adopting an aluminum material by using an extrusion process;
and preparing a screen printing layer on the substrate by using a screen printing process.
As shown in fig. 1, a material such as aluminum alloy is used, and an extrusion molding process is performed to obtain a comb-shaped structure as shown in the figure, wherein teeth of the structure are equivalent to fins and used for increasing a heat dissipation area. The fin structure shown in fig. 1 is only one type, and fins of other shapes may be extruded, and the specific extrusion shape is not limited as long as the heat dissipation area can be increased.
In some embodiments, the preparing a screen printing layer on the substrate by using a screen printing process includes:
preparing insulating paste, printing the insulating paste on the surface of the substrate through a screen printing process, and sintering to obtain an insulating layer;
preparing conductive paste, printing the conductive paste on the surface of the insulating layer by a screen printing process, and sintering to obtain a resistance layer and a conductor layer;
preparing protective layer slurry, printing the protective layer slurry on the surfaces of the resistance layer and the conductor layer by a screen printing process, and sintering to obtain a protective layer;
in some embodiments, the preparing a screen printing layer on the substrate by using a screen printing process further includes: preparing zirconia-based slurry, printing the zirconia-based slurry between the resistance layer and the protective layer and between the conductor layer and the protective layer through a screen printing process, and sintering to obtain the temperature sensing layer.
Preferably, the temperature of each sintering treatment is 490 to 510 ℃, and the sintering temperature is set within this range, which is 660 ℃ lower than the melting point temperature of aluminum, whereby damage to the aluminum substrate 1 when the screen printing layer is sintered can be avoided.
In the embodiment, the insulating layer 2, the resistance layer and the conductor layer 3, the temperature sensing layer 5 and the protection layer 4 are sequentially prepared on the substrate 1 by adopting a non-co-firing process, wherein the non-co-firing process is sintering treatment after printing one layer, and the problem of mismatched expansion coefficients and the like caused by mixing and sintering slurry is solved by adopting the mode.
In conclusion, in the embodiment, the substrate 1 is prepared by the aluminum extrusion process, the conductive performance of aluminum is good, meanwhile, the extruded part is used as the fin 6, the heat dissipation is increased, on one hand, the heat dissipation structures such as the brazing fin 6 are omitted, the process is simple, and the cost is reduced. On the other hand, the actual normal working temperature of the aluminum-based heating unit is maintained at 150-160 ℃, which is far lower than the working temperature of the stainless steel base, namely 240-250 ℃, the thermal failure rate is greatly reduced, and the probability of thermal breakdown and thermal failure is greatly reduced.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. An aluminum-based heating unit, comprising: the aluminum base plate comprises an aluminum base plate (1), fins (6) and a screen printing layer, wherein the screen printing layer is arranged on one side of the base plate (1), and the fins (6) are arranged on the other side of the base plate (1).
2. Aluminium-based heating unit according to claim 1, characterised in that said fins (6) are spaced apart on said base plate (1) and the spacing between each of said fins (6) is 0.5-0.8mm.
3. Aluminium-based heating unit according to claim 1, characterized in that the thickness of the fins (6) is 0.8-1mm.
4. The aluminium-based heating unit according to claim 1, characterized in that the width-to-height ratio of the fins (6) is greater than 1.
5. Aluminium-based heating unit according to claim 1, characterized in that the screen-printed layer comprises an insulating layer (2), a resistive and conductive layer (3) and a protective layer (4) arranged in that order on the surface of the substrate (1).
6. The aluminium-based heating unit according to claim 5, wherein the screen-printed layer further comprises a temperature-sensitive layer (5), the temperature-sensitive layer (5) being arranged between the resistive and conductive layer (3) and the protective layer (4).
7. A method for the production of an aluminium based heating element according to any of claims 1 to 6, comprising:
integrally forming a base plate (1) with fins (6) by adopting an aluminum material by utilizing an extrusion process;
preparing a screen printing layer on the substrate (1) by using a screen printing process.
8. The method for the production of an aluminum-based heating unit according to claim 7, characterized in that said production of a serigraphic layer on said substrate (1) by means of a screen printing process comprises:
preparing insulating slurry, printing the insulating slurry on the surface of the substrate (1) through a screen printing process, and sintering to obtain an insulating layer (2);
preparing conductive paste, printing the conductive paste on the surface of the insulating layer (2) through a screen printing process, and sintering to obtain a resistance layer and a conductor layer (3);
preparing protective layer slurry, printing the protective layer slurry on the surfaces of the resistance layer and the conductor layer (3) through a screen printing process, and sintering to obtain the protective layer (4).
9. The method for manufacturing an aluminum-based heating unit according to claim 8, wherein said preparing a screen-printed layer on said substrate (1) using a screen printing process further comprises:
preparing zirconia-based slurry, printing the zirconia-based slurry between the resistance layer and the conductor layer (3) and the protective layer (4) through a screen printing process, and sintering to obtain the temperature sensing layer (5).
10. The method for the preparation of an aluminium-based heating unit according to claim 9, characterised in that the temperature of the sintering process is 490-510 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211729999.4A CN115884450A (en) | 2022-12-30 | 2022-12-30 | Aluminum-based heating unit and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211729999.4A CN115884450A (en) | 2022-12-30 | 2022-12-30 | Aluminum-based heating unit and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115884450A true CN115884450A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211729999.4A Pending CN115884450A (en) | 2022-12-30 | 2022-12-30 | Aluminum-based heating unit and preparation method thereof |
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| CN (1) | CN115884450A (en) |
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- 2022-12-30 CN CN202211729999.4A patent/CN115884450A/en active Pending
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