CN116598895A - Modified discharge electrode of ion wind generating device, modification method and application thereof - Google Patents

Modified discharge electrode of ion wind generating device, modification method and application thereof Download PDF

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Publication number
CN116598895A
CN116598895A CN202310655125.7A CN202310655125A CN116598895A CN 116598895 A CN116598895 A CN 116598895A CN 202310655125 A CN202310655125 A CN 202310655125A CN 116598895 A CN116598895 A CN 116598895A
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discharge electrode
ion wind
wind generating
generating device
heat treatment
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陈开辉
李爵煜
郑润森
罗伟昌
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Dongguan Songshan Lake Techxinstitute Co ltd
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Dongguan Songshan Lake Techxinstitute Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H01T19/04—Devices providing for corona discharge having pointed electrodes
    • A—HUMAN NECESSITIES
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    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/22—Ionisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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    • H—ELECTRICITY
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    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
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    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
    • H01B7/428—Heat conduction
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
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Abstract

The invention provides a modified discharge electrode of an ion wind generating device, a modification method and application thereof. The modified discharge electrode comprises a needle-net electrode structure, and the surface of a needle point in the modified discharge electrode is provided with a carbon nano tube layer and a protective layer positioned on the surface of the carbon nano tube layer. The modified discharge electrode provided by the invention has the advantages that the surface of the needle point of the needle-mesh electrode structure is subjected to double modification of the carbon nano tube and the protective layer, the electric conductivity and the heat conductivity are good, the heat dissipation effect is good, the contact resistance between the modified discharge electrode and the discharge electrode is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.

Description

Modified discharge electrode of ion wind generating device, modification method and application thereof
Technical Field
The invention belongs to the technical field of ion wind generating devices, and relates to a modified discharge electrode of an ion wind generating device, a modification method and application thereof.
Background
The ion wind generating device has wide application in the fields of air purification, electrostatic dust removal, gas transmission and the like. Conventional ion wind generating devices use wires or metal meshes as discharge electrodes, but these structures are easily affected by external environments, resulting in unstable performance.
The utility model discloses an ion wind generating device like CN204329183U, including the casing, be equipped with air inlet and gas outlet on the casing, along the direction from the air inlet to the gas outlet in the casing, set gradually silk electrode, cylinder electrode and flat board electrode, the silk electrode is connected DC power supply positive pole, cylinder electrode ground connection, flat board electrode connects DC power supply negative pole, forms the electric separation field between silk electrode and the cylinder electrode, forms accelerating electric field between cylinder electrode and the flat board electrode.
Further, a needle-net discharge electrode structure such as CN108870530a is presented to an ion wind generating device and an air conditioning indoor unit. The ion wind generating device includes at least one discharge module that is used for producing ion wind, and every discharge module all includes: the reticular electrode extends perpendicular to the air supply direction of the ion wind generating device; a plurality of needle electrodes distributed on the downstream side of the mesh electrode along the air supply direction of the ion wind generator, and the tips of the needle electrodes are directed to the mesh electrode; a needle holder for fixing a plurality of needle electrodes; and the shielding net is arranged on one side of the needle frame, which is opposite to the reticular electrode, and a gap is formed between the shielding net and the needle frame so as to prevent the needle electrode from discharging towards one side, which is opposite to the reticular electrode.
The generation of ionic wind results from the corona discharge principle: after a certain high voltage is applied between the needle electrode (namely corona electrode) and the receiving electrode (namely net electrode), forward corona discharge is generated, gas near the needle tip of the needle electrode is ionized to form hundreds of millions of ions, air molecules or dust particles are combined to charge the ions, and the ions are rapidly attracted by the receiving electrode under the action of a high-voltage electric field, and inertia is kept to continue to move, so that beneficial ion wind is formed. While using higher voltages increases the power consumption.
Therefore, how to improve the performance of the corona discharge electrode and improve the energy conversion efficiency and stability of the ion wind generating device is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a modified discharge electrode of an ion wind generating device, a modification method and application thereof. The modified discharge electrode provided by the invention has the advantages that the surface of the needle point of the needle-mesh electrode structure is subjected to double modification of the carbon nano tube and the protective layer, the electric conductivity and the heat conductivity are good, the heat dissipation effect is good, the contact resistance between the modified discharge electrode and the discharge electrode is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides a modified discharge electrode of an ion wind generating device, the modified discharge electrode comprises a needle-mesh electrode structure, and a carbon nano tube layer and a protective layer positioned on the surface of the carbon nano tube layer are arranged on the surface of a needle point in the modified discharge electrode.
The needle-net electrode structure provided by the invention is a conventional structure in the ion wind generating device, and the specific connection relation and the structure type of the needle-net electrode structure can be adaptively adjusted according to actual requirements.
The modified discharge electrode has stable structure, the double modified structure (nano material modification) of the carbon nano tube layer and the protective layer, the carbon nano tube has high aspect ratio, excellent conductivity, mechanical strength and chemical stability, and the discharge electrode has smaller curvature radius after being coated on the tip of the electrode, so that the local electric field strength is enhanced; the protective layer can improve the surface morphology of the electrode and improve the stability of the discharge electrode. Meanwhile, the material in the protective layer has low work function and the length-diameter ratio of the carbon nano tube so that the double modified structure has good electrical conductivity and thermal conductivity, good heat dissipation effect, oxidation resistance and contact resistance between the material and the discharge electrode are reduced; the microcosmic appearance of the electrode surface is changed, the electric field distribution near the discharge electrode is affected, the starting voltage can be obviously reduced, the wind speed is improved, the concentration of generated ozone is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.
In the invention, if the protective layer is not arranged on the surface of the carbon nano tube layer, the carbon nano tube coating cannot be protected, the conductivity of the discharge electrode is increased, and the contact resistance between the discharge electrode and the carbon nano tube layer is reduced; if the pure protective layer is modified, the purpose of enabling the discharge electrode to have smaller curvature radius and enhancing local electric field strength cannot be achieved; in the invention, the double modification structure of the carbon nano tube layer and the protective layer is not necessary, the sequence cannot be changed, and once the modification is carried out, the modification of the discharge electrode of the ion wind generating device cannot be solved, so that the ion wind generating device has good electric conductivity and thermal conductivity, good heat dissipation effect, the contact resistance between the ion wind generating device and the discharge electrode is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.
Preferably, the carbon nanotubes have a diameter < 5nm, e.g. 1nm, 2nm, 3nm, 4nm or 4.5nm, etc.
Preferably, the carbon nanotubes have a length of 5 to 15 μm, for example 5 μm, 8 μm, 10 μm, 13 μm or 15 μm, etc.
In the invention, the diameter and the length of the carbon nano tube are regulated, so that the purposes of increasing the stability of the nano coating, enabling the discharge electrode to have smaller curvature radius and enhancing the local electric field intensity can be better realized.
Preferably, the material in the protective layer comprises a metal oxide and/or a non-metal oxide.
The material of the protective layer in the invention has the characteristics of high chemical stability and thermal stability.
Preferably, the metal oxide comprises any one or a combination of at least two of titanium dioxide, aluminum nitride or aluminum oxide.
Preferably, the non-metal oxide comprises any one or a combination of at least two of silicon dioxide, silicon nitride, boron nitride or silicon carbide.
Preferably, the needles in the needle-mesh electrode structure comprise tungsten needles.
In the invention, the needle in the needle-net electrode structure is a tungsten needle, so that high-temperature stability, excellent conductivity, enhanced mechanical strength and wear resistance and good chemical stability can be better realized.
Preferably, the ratio of the mass of the carbon nanotubes to the mass of the material of the protective layer is (0.4-0.7): 1, for example, 0.4:1, 0.5:1, 0.6:1, or 0.7:1.
In the invention, the ratio of the mass of the carbon nano tube to the mass of the material of the protective layer is too large, namely, the carbon nano tube is too large, so that the discharge resistance can be increased, and the ratio of the mass is too small, namely, the carbon nano tube is too small, so that the discharge effect of the electrode can be influenced.
In a second aspect, the present invention provides a modification method of the modified discharge electrode of the ion wind generating device according to the first aspect, the modification method comprising the steps of:
and (3) contacting the surface of the needle point in the unmodified discharge electrode with carbon nanotube sol, sintering, then contacting the needle point with protective layer sol again, and performing heat treatment to obtain the modified discharge electrode of the ion wind generating device.
According to the preparation method provided by the invention, after the carbon nano tube is obtained on the surface of the needle point, sintering is carried out, so that the effects of solidifying the carbon nano tube and enabling the discharge electrode to have smaller curvature radius are achieved, the heat treatment after the protective layer is further obtained, the carbon nano tube can be further fused with the carbon nano tube, and the carbon nano tube coating is protected.
In the invention, if the sintering and heat treatment processes are not performed, the curing of the nano material coating cannot be realized, the fusion of the protective layer and the carbon nano tube coating cannot be realized, and the service life and the performance of the nano coating are influenced.
Preferably, the needles in the unmodified discharge electrode are first cleaned.
Preferably, the preparation of the carbon nanotube sol comprises: mixing the carbon nanotubes with an organic solvent, grinding and stirring.
Preferably, the concentration of the carbon nanotubes in the carbon nanotube sol is 4-70 mg/mL, for example, 4mg/mL, 5mg/mL, 10mg/mL, 20mg/mL, 30mg/mL, 40mg/mL, 50mg/mL, 60mg/mL, 70mg/mL, or the like.
Preferably, the organic solvent comprises ethylcellulose and/or terpineol.
In the invention, the sol of the protective layer is adaptively adjusted according to different materials.
Preferably, the sintering includes sequentially performing primary sintering and secondary sintering.
In the invention, the primary sintering plays a role of drying the carbon nano tube sol, removes the organic solvent therein, further carries out secondary sintering, improves the adhesive strength and stability of the carbon nano tube coating, and if the secondary sintering is not carried out, the adhesive strength of the coating is poor, the bonding strength is insufficient, the functional performance is unstable, thereby generating the risk of falling off the carbon nano tube coating, and the uncured carbon nano tube coating possibly releases uncured components or volatile organic matters to cause potential risks to human health or environment; the sintering process is carried out in at least two steps, and further, the multi-step sintering can be carried out.
Preferably, the temperature of the primary sintering is 180 to 250 ℃, for example 180 ℃, 200 ℃, 230 ℃, 250 ℃, or the like.
Preferably, the time of the primary sintering is 5 to 10min, for example, 5min, 6min, 7min, 8min, 9min or 10min, etc.
Preferably, the secondary sintering is performed at a temperature of 320 to 380 ℃, for example 320 ℃, 330 ℃, 340 ℃, 350 ℃, 360 ℃, 370 ℃, 380 ℃, or the like.
Preferably, the secondary sintering time is 25 to 35min, for example 25min, 26min, 27min, 28min, 29min, 30min, 31min, 32min, 33min, 34min or 35min, etc.
In the invention, the secondary sintering temperature is too low, which is not beneficial to complete solidification of the coating, leads to insufficient bonding strength between the coating and the substrate, and too high temperature leads to damage of the carbon nano tube structure, so that the carbon nano tube structure loses the original shape and performance, damages or deforms the substrate material and loses the original shape and performance.
Preferably, the heat treatment includes sequentially performing a primary heat treatment and a secondary heat treatment.
In the invention, the primary heat treatment plays a role of drying the protective layer, and further, the secondary heat treatment realizes the improvement of the adhesion strength and stability of the protective coating, and if the secondary heat treatment is not performed, the poor adhesion of the protective coating and the poor bonding degree with the carbon nano tube coating can be caused. The heat treatment process in the invention is at least two heat treatments, and further, multi-step heat treatments can be carried out.
Preferably, the temperature of the primary heat treatment is 150 to 170 ℃, for example 150 ℃, 160 ℃, 170 ℃, or the like.
Preferably, the time of the one heat treatment is 5 to 15 minutes, for example, 5 minutes, 8 minutes, 10 minutes, 13 minutes, 15 minutes, or the like.
Preferably, the temperature of the secondary heat treatment is 320 to 380 ℃, for example 320 ℃, 330 ℃, 340 ℃, 350 ℃, 360 ℃, 370 ℃, 380 ℃, or the like.
Preferably, the time of the secondary heat treatment is 25 to 35min, for example, 25min, 26min, 27min, 28min, 29min, 30min, 31min, 32min, 33min, 34min or 35min, etc.
In the invention, the temperature of the secondary heat treatment is too low, which can influence the complete solidification of the coating, lead to insufficient bonding strength of the coating and the carbon nano tube coating, and too high temperature can lead to the damage of the carbon nano tube structure in the protective layer, lead to the surface defect of the titanium dioxide coating and influence the discharge effect of the electrode.
Preferably, the method of contacting comprises dipping.
As a preferred technical scheme, the modification method comprises the following steps:
dipping the surface of a needle point in the cleaned unmodified discharge electrode with carbon nano tube sol, performing primary sintering for 5-10 min at 180-250 ℃, performing secondary sintering for 25-35 min at 320-380 ℃, dipping the needle point after secondary sintering with protective layer sol again, performing primary heat treatment for 5-15 min at 150-170 ℃ and performing secondary heat treatment for 25-35 min at 320-380 ℃ to obtain the modified discharge electrode of the ion wind generating device.
In a third aspect, the present invention provides an ion wind generating device comprising a modified discharge electrode as described in the first aspect.
The modified discharge electrode provided by the invention is adopted in the discharge module of the ion wind generating device, has wide application prospect, and has important application value in the fields of air purification, electrostatic dust removal, gas transmission and the like. For example, in the field of air purification, the ion wind generating device of the invention can effectively remove bacteria, viruses and harmful substances in the air; in the field of electrostatic dust removal, the ion wind generating device can effectively remove dust and pollutants in industrial waste gas; in the field of gas transport, the ion wind generating device can be used for accelerating gas flow and transport.
Compared with the prior art, the invention has the following beneficial effects:
the modified discharge electrode has stable structure, the double modified structure (nano material modification) of the carbon nano tube layer and the protective layer, the carbon nano tube has high aspect ratio, excellent conductivity, mechanical strength and chemical stability, and the discharge electrode has smaller curvature radius after being coated on the tip of the electrode, so that the local electric field strength is enhanced; the protective layer can improve the surface morphology of the electrode and improve the stability of the discharge electrode. Meanwhile, the material in the protective layer has low work function and the length-diameter ratio of the carbon nano tube so that the double modified structure has good electrical conductivity and thermal conductivity, good heat dissipation effect, oxidation resistance and contact resistance between the material and the discharge electrode are reduced; the microcosmic appearance of the electrode surface is changed, the electric field distribution near the discharge electrode is affected, the starting voltage can be obviously reduced, the wind speed is improved, the concentration of generated ozone is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a modified discharge electrode of an ion wind generating device, the modified discharge electrode is of a needle-net electrode structure, and the surface of a needle tip in the modified discharge electrode is provided with a carbon nano tube layer and TiO (titanium dioxide) on the surface of the carbon nano tube layer 2 Layer (carbon nanotube and TiO) 2 The mass ratio of (2) is 0.5:1).
The modification method of the modified discharge electrode comprises the following steps:
(1) Preparing carbon nanotube sol and TiO 2 Sol;
carbon nanotube sol: dissolving CNTs with the purity of more than 90 percent, the diameter of less than 5nm and the length of 10 mu m in ethyl cellulose and terpineol organic slurry according to the mass ratio of 1/20, continuously grinding in a mortar to be uniform, and magnetically stirring for 4 hours to obtain carbon nano tube sol;
TiO 2 sol: mixing the mixed solution of tetrabutyl titanate and absolute ethyl alcohol with the mixed solution of glacial acetic acid and concentrated hydrochloric acid, continuously grinding the sol solution in a mortar to be uniform, and magnetically stirring for 4 hours to obtain TiO 2 Sol;
(2) Dipping the tip of the cleaned bare tungsten needle (the bare tungsten needle is cleaned by acetone, isopropanol and deionized water in an ultrasonic environment) into CNTs sol, putting the CNTs sol into a box-type resistance furnace, drying the CNTs sol at 200 ℃ for 10 minutes (primary sintering), annealing the CNTs sol at 350 ℃ for 30 minutes (secondary sintering), and taking the CNTs sol out after cooling;
(3) Dipping the needle tip into TiO again 2 The sol is put into a box-type resistance furnace, dried at 160 ℃ for one time (heat treatment), and then baked at 350 ℃ for 30 minutes (two times)Secondary heat treatment), cooling and taking out to obtain the modified discharge electrode.
Example 2
The embodiment provides a modified discharge electrode of an ion wind generating device, the modified discharge electrode is of a needle-net electrode structure, and the surface of a needle tip in the modified discharge electrode is provided with a carbon nano tube layer and TiO (titanium dioxide) on the surface of the carbon nano tube layer 2 Layer (carbon nanotube and TiO) 2 The mass ratio of (2) is 0.7:1).
The modification method of the modified discharge electrode comprises the following steps:
(1) Preparing carbon nanotube sol and TiO 2 Sol;
carbon nanotube sol: dissolving CNTs with the purity of more than 90 percent, the diameter of less than 5nm and the length of 12 mu m in ethyl cellulose and terpineol organic slurry according to the mass ratio of 1/20, continuously grinding in a mortar to be uniform, and magnetically stirring for 4 hours to obtain carbon nano tube sol;
TiO 2 sol: mixing the mixed solution of tetrabutyl titanate and absolute ethyl alcohol with the mixed solution of glacial acetic acid and concentrated hydrochloric acid, continuously grinding the sol solution in a mortar to be uniform, and magnetically stirring for 4 hours to obtain TiO 2 Sol;
(2) Dipping the tip of the cleaned bare tungsten needle (the bare tungsten needle is cleaned by acetone, isopropanol and deionized water in an ultrasonic environment) into CNTs sol, putting the CNTs sol into a box-type resistance furnace, drying the CNTs sol at 250 ℃ for 5 minutes (primary sintering), annealing the CNTs sol at 370 ℃ for 25 minutes (secondary sintering), and cooling the CNTs sol and taking the CNTs sol out;
(3) Dipping the needle tip into TiO again 2 The sol is put into a box-type resistance furnace, dried at 170 ℃ for primary heat treatment, then baked at 370 ℃ for 25 minutes for secondary heat treatment, cooled and taken out to obtain the modified discharge electrode.
Example 3
The embodiment provides a modified discharge electrode of an ion wind generating device, the modified discharge electrode is of a needle-net electrode structure, and the surface of a needle tip in the modified discharge electrode is provided with a carbon nano tube layer and TiO (titanium dioxide) on the surface of the carbon nano tube layer 2 Layer (carbon nanotube and TiO) 2 The mass ratio of (2) is 0.4:1).
The modification method of the modified discharge electrode comprises the following steps:
(1) Preparing carbon nanotube sol and TiO 2 Sol;
carbon nanotube sol: dissolving CNTs with the purity of more than 90 percent, the diameter of less than 5nm and the length of 15 mu m in ethyl cellulose and terpineol organic slurry according to the mass ratio of 1/20, continuously grinding in a mortar to be uniform, and magnetically stirring for 4 hours to obtain carbon nano tube sol;
TiO 2 sol: mixing the mixed solution of tetrabutyl titanate and absolute ethyl alcohol with the mixed solution of glacial acetic acid and concentrated hydrochloric acid, continuously grinding the sol solution in a mortar to be uniform, and magnetically stirring for 4 hours to obtain TiO 2 Sol;
(2) Dipping the tip of the cleaned bare tungsten needle (the bare tungsten needle is cleaned by acetone, isopropanol and deionized water in an ultrasonic environment) into CNTs sol, putting the CNTs sol into a box-type resistance furnace, drying the CNTs sol at 180 ℃ for 10 minutes (primary sintering), annealing the CNTs sol at 320 ℃ for 30 minutes (secondary sintering), and cooling the CNTs sol and taking the CNTs sol out;
(3) Dipping the needle tip into TiO again 2 The sol is put into a box-type resistance furnace, dried at 170 ℃ (primary heat treatment), then baked at 320 ℃ for 30 minutes (secondary heat treatment), cooled and taken out to obtain the modified discharge electrode.
Example 4
The difference between this example and example 1 is that the protective layer in this example is Boron Nitride (BN), and the TiO is prepared by 2 The sol is replaced by a Boron Nitride (BN) sol.
The remaining modification procedure and parameters were consistent with example 1.
Example 5
The difference between the present embodiment and embodiment 1 is that the carbon nanotubes and TiO in the present embodiment 2 The mass ratio of (2) is 0.3:1.
The remaining modification procedure and parameters were consistent with example 1.
Example 6
The difference between the present embodiment and embodiment 1 is that the carbon nanotubes and TiO in the present embodiment 2 Is 0.8 mass ratio:1。
The remaining modification procedure and parameters were consistent with example 1.
Example 7
The difference between this example and example 1 is that the secondary sintering process was not performed in step (2) of this example.
The remaining modification procedure and parameters were consistent with example 1.
Example 8
The difference between this example and example 1 is that the temperature of the secondary sintering in step (2) of this example was 300 ℃.
The remaining modification procedure and parameters were consistent with example 1.
Example 9
The difference between this example and example 1 is that the temperature of the secondary sintering in step (2) of this example was 400 ℃.
The remaining modification procedure and parameters were consistent with example 1.
Example 10
The difference between this example and example 1 is that the secondary heat treatment process was not performed in step (3) of this example.
The remaining modification procedure and parameters were consistent with example 1.
Example 11
The difference between this example and example 1 is that the temperature of the secondary heat treatment in step (2) of this example was 300 ℃.
The remaining modification procedure and parameters were consistent with example 1.
Example 12
The difference between this example and example 1 is that the temperature of the secondary heat treatment in step (2) of this example was 400 ℃.
The remaining modification procedure and parameters were consistent with example 1.
Comparative example 1
The difference between this comparative example and example 1 is that the discharge electrode in this comparative example was not subjected to any modification treatment.
Comparative example 2
The difference between this comparative example and example 1 is the modification in this comparative exampleTiO (titanium dioxide) protective layer is not arranged on the surface of the carbon nano tube layer of the discharge electrode 2 The layer, the preparation method does not carry out the step (3).
The remaining modification procedure and parameters were consistent with example 1.
Comparative example 3
The comparative example is different from example 1 in that the tip surface of the modified discharge electrode in the comparative example is directly TiO 2 The layer is prepared without dipping the carbon nano tube sol in the step (2).
The remaining modification procedure and parameters were consistent with example 1.
Comparative example 4
The comparative example is different from example 1 in that the tip surface of the modified discharge electrode in the comparative example is provided with TiO 2 Layer and located at TiO 2 Carbon nanotube layers on the layer surface (i.e., the exchange of the order).
In the preparation method, the sequence in the step (2) and the step (3) is adaptively changed.
The remaining modification procedure and parameters were consistent with example 1.
The discharge electrodes provided in examples 1 to 12 and comparative examples 1 to 4 were subjected to performance test under the following conditions:
test scenario: the distance between the discharge electrodes is set to be 15cm, the lower electrode is a copper mesh, and the upper electrode is a needle electrode. An electrostatic generator of 1-100kv is used to supply power, and different tungsten needles are clamped by crocodile clips to change test conditions. And (3) regulating the output voltage of the high-voltage power supply until the discharge phenomenon occurs for the first time, and recording the current voltage value as the starting voltage. The velocimeter is placed in the path of the ion wind and should be as close as possible to the ion wind generator to minimize the impact of environmental factors. And starting the velocimeter, measuring for a plurality of times, recording the measured wind speed, calculating the average wind speed of the ion wind, and testing the ion wind, wherein the test result is shown in table 1.
After 48 hours of continuous discharge testing of the discharge electrodes adjusted by the respective tests, surface abrasion and cracks thereof were observed by a microscope, and according to the observed surface conditions of the coating, cracks of the coatings of example 7, comparative example 2, comparative example 4 were remarkable and partially detached. The remaining electrodes were again subjected to a 72-hour continuous discharge test, and only the surfaces of examples 8, 10, 11 and 12 were worn, and the surfaces of the remaining electrode pins were hardly changed from those before discharge.
TABLE 1
As is apparent from the data of examples 1 and 5 and 6, an excessively large mass ratio of the carbon nanotube to the material in the protective layer may cause an increase in discharge resistance, while an excessively small mass ratio may affect the electrode discharge effect.
From the data results of examples 1 and 7 to 9, it is clear that after the carbon nanotube layer is obtained, the carbon nanotube layer is simply sintered once, i.e., dried, and the carbon nanotube coating cannot be firmly attached to the surface of the tungsten needle without secondary sintering; and the secondary sintering temperature is too high, so that the carbon nano tube structure is damaged, the temperature is too low, the coating is not completely solidified, and the bonding strength with the surface of the tungsten needle is low.
From the data results of examples 1 and 10-12, it is clear that after the protective layer is obtained, the primary heat treatment, i.e., the drying process, is performed only, and the secondary heat treatment is not performed, so that the adhesion strength and stability of the protective coating layer cannot be improved; the temperature of the secondary heat treatment is too high, which is not beneficial to the solidification of the surface of the coating, so that the surface defect of the coating is caused, the discharge effect is affected, and the bonding strength of the coating and the carbon nano tube is insufficient due to the too low temperature.
From the data of example 1 and comparative example 1, it was found that the performance of the discharge electrode of the ion wind generator could not be improved without any modification treatment of the discharge electrode.
From the data results of example 1 and comparative examples 2 to 4, it is known that only by adopting the technical scheme provided by the invention, that is, the double modification and sequential fixing of the carbon nanotube layer and the protective layer, the discharge electrode can be realized to have good electrical conductivity and thermal conductivity, the heat dissipation effect is good, the contact resistance between the discharge electrode and the discharge electrode is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved. Changing either condition does not improve the performance of the discharge electrode.
In summary, in the discharge electrode structure provided by the invention, the multi-step sintering and heat treatment process is performed in the modification process, and the surface of the needle point of the needle-mesh electrode structure is subjected to double modification of the carbon nano tube and the protective layer, so that the discharge electrode structure has good electric conductivity and thermal conductivity, good heat dissipation effect, and the contact resistance between the discharge electrode and the discharge electrode is reduced, and the energy conversion efficiency and the stability of the ion wind generating device are improved.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims (10)

1. The modified discharge electrode of the ion wind generating device is characterized by comprising a needle-net electrode structure, wherein a carbon nano tube layer and a protective layer positioned on the surface of the carbon nano tube layer are arranged on the surface of a needle point in the modified discharge electrode.
2. The modified discharge electrode of an ion wind generating device of claim 1, wherein the carbon nanotubes have a diameter < 5nm;
preferably, the length of the carbon nanotube is 5-15 μm;
preferably, the material in the protective layer comprises a metal oxide and/or a non-metal oxide;
preferably, the metal oxide comprises any one or a combination of at least two of titanium dioxide, aluminum nitride or aluminum oxide;
preferably, the non-metal oxide comprises any one or a combination of at least two of silicon dioxide, silicon nitride, boron nitride or silicon carbide;
preferably, the needles in the needle-mesh electrode structure comprise tungsten needles.
3. The modified discharge electrode of an ion wind generating device according to claim 1 or 2, wherein a ratio of a mass of the carbon nanotube to a mass of a material of the protective layer is (0.4 to 0.7): 1.
4. A modification method of a modified discharge electrode of an ion wind generating apparatus according to any one of claims 1 to 3, characterized in that the modification method comprises the steps of:
and (3) contacting the surface of the needle point in the unmodified discharge electrode with carbon nanotube sol, sintering, then contacting the needle point with protective layer sol again, and performing heat treatment to obtain the modified discharge electrode of the ion wind generating device.
5. The method for modifying a modified discharge electrode of an ion wind generating device according to claim 4, wherein needles in the unmodified discharge electrode are cleaned;
preferably, the preparation of the carbon nanotube sol comprises: mixing the carbon nano tube with an organic solvent, grinding and stirring;
preferably, the concentration of the carbon nano tube in the carbon nano tube sol is 4-70 mg/mL;
preferably, the organic solvent comprises ethylcellulose and/or terpineol.
6. The method for modifying a modified discharge electrode of an ion wind generating device according to claim 4 or 5, wherein the sintering comprises performing primary sintering and secondary sintering in this order;
preferably, the temperature of the primary sintering is 180-250 ℃;
preferably, the time of the primary sintering is 5-10 min;
preferably, the temperature of the secondary sintering is 320-380 ℃;
preferably, the secondary sintering time is 25-35 min.
7. The method for modifying a modified discharge electrode of an ion wind generating device according to any one of claims 4 to 6, wherein the heat treatment comprises sequentially performing a primary heat treatment and a secondary heat treatment;
preferably, the temperature of the primary heat treatment is 150-170 ℃;
preferably, the time of the primary heat treatment is 5-15 min;
preferably, the temperature of the secondary heat treatment is 320-380 ℃;
preferably, the time of the secondary heat treatment is 25 to 35 minutes.
8. A method of modifying a discharge electrode of an ion wind generating apparatus according to any one of claims 4 to 7, wherein the contacting means comprises dipping.
9. The modification method of a modified discharge electrode of an ion wind generating apparatus according to any one of claims 4 to 6, wherein the modification method comprises the steps of:
dipping the surface of a needle point in the cleaned unmodified discharge electrode with carbon nano tube sol, performing primary sintering for 5-10 min at 180-250 ℃, performing secondary sintering for 25-35 min at 320-380 ℃, dipping the needle point after secondary sintering with protective layer sol again, performing primary heat treatment for 5-15 min at 150-170 ℃ and performing secondary heat treatment for 25-35 min at 320-380 ℃ to obtain the modified discharge electrode of the ion wind generating device.
10. An ion wind generating apparatus comprising the modified discharge electrode of any one of claims 1 to 3.
CN202310655125.7A 2023-06-05 2023-06-05 Modified discharge electrode of ion wind generating device, modification method and application thereof Pending CN116598895A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116793892A (en) * 2023-08-29 2023-09-22 东莞松山湖国际机器人研究院有限公司 High-voltage electric field drying rate calculation method based on gravity sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116793892A (en) * 2023-08-29 2023-09-22 东莞松山湖国际机器人研究院有限公司 High-voltage electric field drying rate calculation method based on gravity sensor

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