CN113800889A - Carbon Hertz film and application thereof - Google Patents
Carbon Hertz film and application thereof Download PDFInfo
- Publication number
- CN113800889A CN113800889A CN202111062334.8A CN202111062334A CN113800889A CN 113800889 A CN113800889 A CN 113800889A CN 202111062334 A CN202111062334 A CN 202111062334A CN 113800889 A CN113800889 A CN 113800889A
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- Prior art keywords
- film
- carbon
- hertz
- oxide
- insulating substrate
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 93
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 238000002360 preparation method Methods 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 239000010439 graphite Substances 0.000 claims abstract description 10
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 10
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001947 lithium oxide Inorganic materials 0.000 claims abstract description 8
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011787 zinc oxide Substances 0.000 claims abstract description 5
- 229910000464 lead oxide Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 17
- 238000007650 screen-printing Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000010445 mica Substances 0.000 claims description 11
- 229910052618 mica group Inorganic materials 0.000 claims description 11
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 6
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims description 6
- 229910052810 boron oxide Inorganic materials 0.000 claims description 6
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 6
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 239000005341 toughened glass Substances 0.000 claims description 6
- 229910001935 vanadium oxide Inorganic materials 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000010425 asbestos Substances 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 210000003298 dental enamel Anatomy 0.000 claims description 2
- -1 enamel Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims 1
- 238000005485 electric heating Methods 0.000 abstract description 14
- 230000005855 radiation Effects 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 18
- 230000007774 longterm Effects 0.000 description 11
- 239000002003 electrode paste Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 238000007873 sieving Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 241000779819 Syncarpia glomulifera Species 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000001739 pinus spp. Substances 0.000 description 4
- 229940036248 turpentine Drugs 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000554 physical therapy Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
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Abstract
The invention discloses a carbon Hertz film and application thereof, wherein lead oxide, lithium oxide, zinc oxide and graphite are combined according to a specific proportion as a formula, the lead oxide, the lithium oxide and the zinc oxide can be formed into a film by fluxing, soaking and sintering, the bonding force between the carbon Hertz film and the surface of an insulating substrate is ensured, and the graphite is used as a conductive material. The formula of the carbon hertz film provided by the invention can realize good thermal matching between the carbon hertz ceramic film and the insulating substrate by adjusting the distribution ratio, ensures that the micro-cracking of the carbon hertz film caused by internal stress and interface stress does not occur in a cold and hot cycle, can adapt to substrates of different materials, has wide application range and is beneficial to popularization. The invention is suitable for being applied to the preparation of electric heating elements and infrared radiation elements.
Description
Technical Field
The invention relates to the field of resistance materials, in particular to a carbon hertz film and application thereof.
Background
The carbon Hertz film is also called inorganic resistance thick film or inorganic thick film resistance coating, and is prepared by using high-temperature resistant conductive materials such as graphite and the like as resistance powder, using glass material powder as a binder, mixing the resistance powder with an organic carrier, preparing the film and sintering the film. Because of high heating speed and good high temperature resistance, the glass fiber reinforced plastic composite material can be widely applied to the fields of military, aerospace, industry and agriculture and civilian use, such as antifogging, snow prevention and the like of ships, radars, communication, aerospace and television monitoring devices; heating an operating table, a membrane material melting device, an ultrathin distiller and the like; heating of vehicle reflectors, cushions, door locks, floors, and the like; water heater, drying, house/building heating, ice and snow removal on roof, agricultural products and the like; cold-proof, damp-proof and health-care of human body.
The inorganic resistance thick film usually uses glass and ceramics as an insulating substrate, but the inorganic resistance thick film formula disclosed in the prior art can only be applied to one type or a specific type of substrate, for example, chinese patent with the title of CN103476155B, mica heating substrate coated with inorganic thick film, preparation method thereof and heating component, chinese patent with the title of CN104893372B, high temperature resistant insulating coating for mirror plate, are all targeted formulas with narrow application range, so that research and development of a carbon hertzian film with wide application range has positive significance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a formula of a carbon hertz film suitable for various materials, which comprises all inorganic materials and does not contain any high polymer material, thereby ensuring that the carbon hertz film is stable and unaged for a long time and has the comprehensive properties of temperature resistance, weather resistance, moisture resistance and corrosion resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the carbon Hertz film is prepared from the following materials in parts by weight: 20.0-33.1 parts of lead oxide (PbO) and lithium oxide (Li)226.8 to 38.0 portions of O), 16.0 to 28.9 portions of zinc oxide (ZnO) and 22 to 38 portions of graphite (C). In the formula of the carbon hertz film provided by the invention, the three oxides of lead oxide, lithium oxide and zinc oxide have the following functions: flux-infiltration-sintering film forming, so as to ensure the binding force between the carbon Hertz film and the surface of the insulating substrate and the cohesive force of the carbon Hertz film layer, and ensure that the formed film is firm and does not fall off.
Further, the preparation material also comprises the following additives in parts by weight: boron oxide (B)2O3)0.1-2.0 parts of chromium oxide (Cr)2O3)0-0.074, iron oxide (Fe)2O3)0-0.148 part and 0-0.037 part of vanadium oxide. In the formula of the carbon hertz film provided by the invention, boron oxide, chromium oxide, iron oxide and vanadium oxide (V)2O5) Four kinds of oxygenThe compound belongs to an additive, and has the functions of adjusting the linear expansion coefficient of the carbon hertz film, realizing better thermal matching between the carbon hertz film and the insulating substrate and ensuring that microscopic cracks of the carbon hertz film caused by internal stress and interface stress do not occur in cold and hot circulation. The inventor finds that the micro-cracking phenomenon is caused by poor thermal matching between the carbon hertz film and the insulating substrate, which is related to the hardness of the carbon hertz film, reduces the hardness and brittleness of the carbon hertz film, and improves the micro elasticity and flexibility of the carbon hertz film to be better matched with the thermal expansion coefficient of the insulating substrate, so that the addition amount of the additive can be changed according to different linear expansion coefficients of the insulating substrate material, one, two, three or four additives can be added, and the addition amount is not large, but the effect is obvious.
Further, the graphite is natural crystalline flake graphite powder. The natural crystalline flake graphite is natural crystalline graphite which is similar to fish phosphorus in shape, belongs to a hexagonal system, has a layered structure, is complete in crystalline flake graphite, is thin and good in toughness, has excellent physical and chemical properties, has good heat conductivity, thermal shock resistance, corrosion resistance, high temperature resistance, lubrication, plasticity and other properties, and is rich in resources and low in price. In the invention, the natural crystalline flake graphite powder has the function of electric conduction, and the dosage proportion of the natural crystalline flake graphite powder can be properly increased and decreased within the variation range provided by the formula according to the specific requirements of users on the square resistance value of the carbon Hertz film.
Further, the material for preparing the carbon hertz film does not contain silicon dioxide. The inventors found in experiments that silicon oxide (SiO)2) Also called quartz sand, because of its small expansion coefficient (less than 5X 10)-7) The material property is brittle and hard, and after the silicon oxide is used, microscopic cracking caused by thermal mismatch is easy to occur, so the invention does not use the silicon oxide (quartz sand) but uses the zinc oxide instead (the film system performance is relatively good).
Further, the thickness of the carbon hertz film is 0.05-0.80 mm.
Further, the preparation method of the carbon hertz film comprises the following steps: preparing the preparation material into mixed dry powder, preparing the mixed dry powder on the surface of an insulating substrate into a film by adopting a coating or screen printing process, and permanently sintering the film and the insulating substrate into an integral body with an interface which is mutually permeated and can not be stripped. The preparation method of the carbon hertz film and the film system can further comprise the following steps:
s1, preparing related chemical raw materials according to the chemical component proportion (weight part) of the carbon hertz film, and then carrying out conventional processes such as batching, mixing, high temperature crushing, sieving, detecting and the like;
s2, adding turpentine, ethanol and glycerin (serving as an oily carrier of the silk-screen printing slurry), blending to obtain the silk-screen printing slurry of the carbon hertz film, and preparing: the thick-film electrode paste and the thick-film contact paste (the two pastes can be prepared by adopting the prior art or purchasing a commercially available finished product) are fully mixed uniformly and fully stirred uniformly, and the viscosity of the paste is based on the requirement of being suitable for a screen printing machine;
and S3, adopting a screen printing screen plate with 30-80 meshes, sequentially printing a thick film electrode, a thick film contact and a carbon hertz film, sequentially sintering to form a film, and detecting the film system parameters.
Furthermore, the insulating substrate is made of any one of glass, enamel, ceramics, insulated and processed metal or alloy, asbestos, mica, high aluminum and aluminum silicate.
Further, the insulating substrate is any one of a zirconium ceramic plate/tube, a temperature-resistant ceramic plate/tube, a ceramic glass plate/tube, a quartz glass plate/tube, a high-boron glass or 95 glass plate/tube, a microcrystalline glass plate/tube, a temperature-resistant toughened glass plate/tube, a metal plate/tube subjected to surface insulation treatment and an artificial mica plate.
Further, the insulating substrate has a linear expansion coefficient of 2 × 10-7-200×10-7。
The invention also aims to provide application of the carbon hertz film in preparing electric heating elements and infrared radiation elements. The carbon hertz film, the thick film electrode and the thick film contact jointly form a thick film type electric heating body, also called a carbon hertz film system, which belongs to a typical new material of a surface heating film system and is suitable for preparing a thin plate type electric heating element with single surface or double surfaces for supplying heat, a thin plate type infrared element with single surface or double surfaces for radiating, a tubular electric heating element for rapidly heating fluid and the like.
After the technical scheme is adopted, the invention also has the following beneficial effects:
1. the carbon hertz membrane formula provided by the invention can realize good thermal matching between the carbon hertz ceramic membrane and the insulating substrate by adjusting the distribution ratio, ensures that the carbon hertz membrane does not generate micro-cracking of the carbon hertz membrane due to internal stress and interface stress in cold and hot circulation, can adapt to substrates of different materials, has wide application range and is beneficial to popularization;
2. the carbon hertz film provided by the invention is made of inorganic materials, does not contain any high molecular material, ensures that the carbon hertz film is stable and non-aging for a long time, and has excellent comprehensive performances of temperature resistance (the long-term temperature resistance reaches more than 280 ℃), weather resistance (extreme environments such as long-term marine climate resistance, direct strong sunlight, high altitude climate resistance and the like), moisture resistance (the long-term moisture resistance is more than 95%, and the long-term soaking in water can be realized), and corrosion resistance (the long-term resistance is in severe climatic environments such as acid rain, alkali rain, salt rain and the like);
3. the carbon hertz film and the new product, new equipment, new technical improvement, new service and the like developed by the electric heating element prepared by the carbon hertz film have the advantages of zero emission, environmental protection, high efficiency, energy conservation, moisture resistance, weather resistance, aging resistance, good material stability, long service life of the electric heating element up to more than 30 years and the like.
Drawings
FIG. 1 is a schematic structural diagram of a carbon Hertz film system provided by the present invention;
FIG. 2 is an enlarged view of region A of the present invention.
In the figure: 100. a thick film contact;
200. a carbon Hertz film;
300. a thick film electrode;
400. an insulating substrate.
Detailed Description
The technical problem that the formula of the carbon hertz film (inorganic resistance thick film) is only suitable for one or a specific type of substrate and the applicable surface is narrow exists in the prior art. The present invention therefore proposes a new solution to this problem.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that those skilled in the art do not know specific techniques or conditions in the examples, and the techniques or conditions are described in the literature in the art or are performed according to the product specification or general techniques or conditions in the art. The raw materials or reagents or apparatuses used are not indicated by manufacturers, and are all conventional products commercially available.
The thick film type electric heating body has been developed and widely used since the late appearance of the last century. Referring to fig. 1 and 2, it includes a thick film contact 100 (thick film contact 100 is used for a contact connection wire or a solder connection wire), a carbon hertz film (also called inorganic resistive thick film) 200, a thick film electrode 300, and an insulating substrate 400. The first three are also called carbon hertz film series, which belongs to a typical new material of a surface heating film series and is suitable for preparing sheet type electric heating elements with single surface or double surfaces for supplying heat, sheet type infrared elements with single surface or double surfaces for radiating, tubular electric heating elements for rapidly heating fluid and the like.
The following is a specific example of the formulation of the present invention implemented on a substrate of a different material.
Example 1:
in the embodiment, the double-sided heat-dissipation convection heating element is prepared by taking an artificial mica plate (the reference linear expansion coefficient is about 50-80 multiplied by 10-7K-1) as an insulating substrate and adopting the carbon Hertz film formula provided by the invention.
In this example, the material for preparing the carbon hertz film comprises, in parts by weight
26.0 parts of lead oxide (PbO) and lithium oxide (Li)229.8 portions of O), 18.0 portions of zinc oxide (ZnO), 28 portions of natural crystalline flake graphite powder (C) and boron oxide (B)2O3)0.9 part of chromium oxide (Cr)2O3)0.03 part of iron oxide (Fe)2O3)0.08 portion of vanadium oxide (V)2O5)0.01 part.
The preparation process of the carbon Hertz film and the preparation process of the convection heating element with double-sided heat dissipation comprises the following steps:
(1) according to the formula of the carbon hertz film provided by the embodiment 1, preparing related chemical raw materials, and preparing a mixed dry powder material through conventional processes of material mixing, high-temperature melting, crushing, sieving, detection and the like;
(2) sieving the mixed dry powder material by a 250-mesh standard sieve, stirring for 10 minutes in a mixer, fully and uniformly mixing, then adding turpentine methanol which accounts for 60 percent of the total weight of the mixed dry powder material (if glycerol is added, the adding amount is not more than 8 percent of the total weight of the mixed dry powder material), fully and uniformly stirring by a beater to prepare silk-screen printing slurry, and bottling for later use;
(3) preparing thick film electrode paste and thick film contact paste (the thick film electrode paste and the thick film contact paste can be prepared according to the conventional formula in the prior art or can be prepared by purchasing a commercially available finished product);
(4) taking an artificial mica plate with the specification of 270 multiplied by 1mm (length multiplied by width multiplied by thickness) as the insulating substrate of the embodiment, adopting a silk-screen printing process, silk-screen printing a thick film electrode, a thick film contact and a carbon hertz film on the surface of the artificial mica plate in sequence, sintering the silk-screen printing process to form a film and detecting the parameters of the film system in sequence; the screen printing screen plate of the thick film electrode and the thick film contact is 60 meshes, the sintering process is at 430 ℃ for 12 minutes, and the actually measured resistance at two ends of the electrode is less than 0.2 ohm; the silk screen plate of the carbon hertz film is 40 meshes, and the sintering process is 390 ℃ for 14 minutes; detecting that the total resistance value between the two electrode contacts of the carbon Hertz film is 207-242 ohms; the sheet resistance of the carbon hertz film is in the range of 12-16 ohms/square.
(5) The artificial mica cover plate is adopted for riveting and packaging, the rated power of the packaged electric heating element is 200 plus 234 watts, and the GB4706 national standard safety standard is met; the maximum working temperature of the double-sided heat dissipation convection heating element is 180 ℃, and the double-sided heat dissipation convection heating element is suitable for application scenes of home heating in the three north areas.
It should be noted that all the detection methods in the present invention are based on the related item test methods specified in the current GB4706 national standard.
Example 2:
in this example, a single-sided radiation infrared device is prepared by using a microcrystalline glass plate (with a linear expansion coefficient of 7-11 x 10-7K-1) as an insulating substrate and using the formula of the carbon-Hz film provided by the present invention.
In this example, the material for preparing the carbon hertz film comprises, in parts by weight
23.0 parts of lead oxide (PbO) and lithium oxide (Li)227.8 portions of O), 16.5 portions of zinc oxide (ZnO), 35 portions of natural crystalline flake graphite powder (C) and boron oxide (B)2O3)0.3 part of chromium oxide (Cr)2O3)0.02 part of iron oxide (Fe)2O3)0.06 part of vanadium oxide (V)2O5)0.01 part;
the preparation process of the carbon Hertz film and the preparation process of the single-side radiation infrared element comprise the following steps:
(1) according to the formula of the carbon hertz film provided by the embodiment 2, preparing related chemical raw materials, and preparing a mixed dry powder material by the conventional processes of material preparation, high temperature, crushing, sieving, detection and the like;
(2) sieving the mixed dry powder through a 260-mesh standard sieve, stirring for 10 minutes in a mixer, fully and uniformly mixing, then adding turpentine accounting for 55 percent of the total weight of the mixed dry powder for alcohol permeation, fully and uniformly stirring by a beater to prepare silk-screen slurry, and bottling for later use;
(3) preparing thick film electrode paste and thick film contact paste (the thick film electrode paste and the thick film contact paste can be prepared according to the conventional formula in the prior art or can be prepared by purchasing a commercially available finished product);
(4) taking a microcrystalline glass plate with the specification of 280 x 4mm as the insulating substrate of the embodiment, adopting a silk-screen process, silk-screen printing a thick film electrode, a thick film contact and a carbon hertz film on the surface of the microcrystalline glass plate in sequence, sintering the thick film electrode, the thick film contact and the carbon hertz film in sequence to form a film, and detecting the parameters of the film system; the screen printing screen of the thick film electrode and the thick film contact is 70 meshes, the sintering process is 440 ℃ for 14 minutes, and the actually measured resistance at the two ends of the electrode is less than 0.2 ohm; the silk screen plate of the carbon hertz film is 40 meshes, and the sintering process is at 400 ℃ for 16 minutes; the total resistance between the two electrode contacts of the carbon Hertz film system was detected to be 120-138 ohms, and the square resistance range of the carbon Hertz film prepared in this example was 11-13 ohms/square.
(5) The artificial mica cover plate with the thickness of 1mm, the heat preservation cotton with the thickness of 8mm and the bright tinplate are overlapped together for packaging, the aluminum edge strips and the picture frame type edge wrapping are adopted for packaging, the rated electrothermal power of the packaged carbon Hertz film system single-side infrared element is 351-403 watts, the infrared emissivity is 94 percent, the highest working temperature is 260 ℃, and the GB4706 national standard safety standard is met;
the carbon hertz film system single-side radiation infrared element of the embodiment is suitable for being used as an application scene of an infrared rapid heating heat supply type, for example: infrared bath heaters, infrared local heating, and the like.
Example 3:
in the embodiment, a low-temperature single-sided radiation infrared element is prepared by taking a toughened glass plate (the toughened glass adopts common nano-calcium flat glass (the linear expansion coefficient is 90-100 x 10-7K-1) and forms internal stress through heat treatment so that the heat resistance of the flat glass is improved) as an insulating substrate according to the carbon Hertz film formula provided by the invention.
In this embodiment, the carbon hertz film is prepared from the following materials in parts by weight:
31.0 parts of lead oxide (PbO) and lithium oxide (Li)235.0 portions of O), 26.0 portions of zinc oxide (ZnO), 23 portions of natural crystalline flake graphite powder (C) and boron oxide (B)2O3)1.6 parts of chromium oxide (Cr)2O3)0.06 portion of iron oxide (Fe)2O3)0.10 part of vanadium oxide (V)2O5)0 part of (A).
The preparation process of the carbon Hertz film and the low-temperature single-side radiation infrared element comprises the following steps:
(1) according to the formula of the carbon hertz film given in the embodiment 3, preparing related chemical raw materials, and preparing a mixed dry powder material by conventional processes of material preparation, high temperature, crushing, sieving, detection and the like;
(2) sieving the mixed dry powder through a 220-mesh standard sieve, stirring for 10 minutes in a mixer, fully and uniformly mixing, then adding turpentine accounting for 62 percent of the total weight of the mixed dry powder for full alcohol permeation, fully and uniformly stirring by a beater to prepare silk-screen slurry, and bottling for later use;
(3) preparing thick film electrode paste and thick film contact paste (the thick film electrode paste and the thick film contact paste can be prepared according to the conventional formula in the prior art or can be prepared by purchasing a commercially available finished product);
(4) taking a toughened glass plate with the specification of 300 × 4mm as the insulating substrate of the embodiment, adopting a silk-screen printing process, silk-screen printing a thick film electrode, a thick film contact and a carbon hertz film on the surface of the toughened glass plate in sequence, sintering the thick film electrode, the thick film contact and the carbon hertz film in sequence to form a film, and detecting parameters of the film system; the screen printing screen of the thick film electrode and the thick film contact is 70 meshes, the sintering process is 420 ℃, the temperature is 14 minutes, and the actually measured resistance at the two ends of the electrode is less than 0.2 ohm; the screen printing screen plate of the carbon hertz film is 40 meshes, and the sintering process is 380 ℃ for 18 minutes; detecting the total resistance value between two electrode contacts of the carbon hertz film system to be 372-484 ohms; the sheet resistance of the carbon hertz films prepared in this example ranged from 21 to 25 ohms per square.
(5) The artificial mica cover plate with the thickness of 1mm, the heat preservation cotton with the thickness of 8mm and the bright tinplate are overlapped together for packaging, the aluminum edge strip and the picture frame type edge wrapping are adopted for packaging, the rated electric heating power of the packaged carbon Hertz film system single-side radiation low-temperature infrared element is 130 watts, the infrared emissivity is 86 percent, the highest working temperature is 120 ℃, and the GB4706 national standard safety standard is met;
the carbon hertz film system of the present embodiment is a single-sided radiation low-temperature infrared device, which is suitable for non-contact human health care type application scenarios, such as: a sole infrared physiotherapy instrument, a portable infrared physiotherapy instrument and the like.
The carbon hertz film provided by the invention is made of inorganic materials, does not contain any high molecular material, ensures long-term stability and non-aging of the carbon hertz film, and has comprehensive superior performance of temperature resistance (the long-term temperature resistance reaches more than 280 ℃, such as an electric heating film oven, the working temperature of which is 260-280 ℃, and can be competent), weather resistance (the long-term resistance to extreme environments such as oceanic climate, direct sunlight, high altitude climate and the like, such as a test sample piece, no change exists in three months when the electric heating film oven is exposed to sunlight, moisture resistance (the long-term resistance to moisture of more than 95 percent, and the long-term resistance to soaking in water, such as a constant-humidity cabinet 95 percent moisture resistance test, no change for 2 months), corrosion resistance (the long-term resistance to acid rain, alkali rain, salt rain and other severe weather environments, such as a sealed overhead barrel with seawater at the bottom, and no change after the test for 2 months).
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The carbon Hertz film is characterized in that the preparation material of the carbon Hertz film comprises the following components in parts by weight: 20.0-33.1 parts of lead oxide, 26.8-38.0 parts of lithium oxide, 16.0-28.9 parts of zinc oxide and 22-38 parts of graphite.
2. The carbon hertz film of claim 1, wherein the preparation material further comprises the following additives in parts by weight: 0.1-2.0 parts of boron oxide, 0-0.074 part of chromium oxide, 0-0.148 part of ferric oxide and 0-0.037 part of vanadium oxide.
3. The carbon hertz film of claim 1, wherein the graphite is natural flake graphite powder.
4. The carbon hertz film of claim 1, wherein: the material of the carbon hertzian film is made without silicon dioxide.
5. The carbon hertz film of claim 1, wherein: the thickness of the carbon hertz film is 0.05-0.80 mm.
6. The carbon hertz film of any one of claims 1-5, wherein: the preparation method of the carbon hertz film comprises the following steps: preparing the preparation material into mixed dry powder, preparing the mixed dry powder on the surface of an insulating substrate into a film by adopting a coating or screen printing process, and permanently sintering the film and the insulating substrate into an integral body with an interface which is mutually permeated and can not be stripped.
7. The carbon hertz membrane of claim 6, wherein the insulating substrate is made of any one of glass, enamel, ceramic, insulated and treated metal or alloy, asbestos, mica, high alumina, and aluminum silicate.
8. The carbon hertz film of claim 6, wherein: the insulating substrate is any one of a zirconium ceramic plate/tube, a temperature-resistant ceramic plate/tube, a ceramic glass plate/tube, a quartz glass plate/tube, high-boron glass or 95 glass plate/tube, a microcrystalline glass plate/tube, a temperature-resistant toughened glass plate/tube, a metal plate/tube subjected to surface insulation treatment and an artificial mica plate.
9. The carbon hertz film of claim 6, wherein: the linear expansion coefficient of the insulating substrate is 2 x 10-7-200×10-7。
10. Use of a carbon hertz film as defined in any one of claims 1 to 9 for the preparation of an electrothermal element, an infrared radiating element.
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