CN102761994A - Nano ceramic electric heating coating device and manufacturing method thereof - Google Patents

Abstract

The invention discloses a nano ceramic electric heating coating device and a manufacturing method thereof, the device comprises an insulating base, a nano electric heating film and conductive contacts, the nano electric heating film is composed of a dielectric material, a nano electric conduction thermal material and a solidified material, the two conductive contacts are arranged on the nano electric heating film and are used for connecting an anode and a cathode of a power supply through a lead, and the method comprises a nano electric heating slurry manufacturing step, a coating step, a conductive contact setting step, a baking step, a cooling and testing step and a control chip connecting step. The invention has high electric heat energy conversion efficiency, can achieve the heating effect in a short time, can save electric energy, reduce the weight of the original electric heating wire or heating pipe, and indirectly reduce the subsequent conveying cost.

Description

Nano-ceramic electrothermal coating device and manufacturing method thereof

technical field

The invention relates to a nano-ceramic electrothermal coating device and a manufacturing method thereof, especially utilizing a nano-electrothermal film composed of a thin-film ceramic dielectric material and a nano-conductive heat material to increase the effective conductivity and reduce the resistance value for rapid heating .

Background technique

Electric heating technology has been invented for more than a hundred years. The main heating device is electric heating wire. The electric heating alloy materials used to make electric heating wire can be divided into two categories: one is iron-chromium-aluminum alloy series, and the other is nickel-chromium alloy series. . The iron-chromium-aluminum alloy (1Cr13Al4 0Cr25Al5 0Cr21Al60Cr21Al6Nb 0Cr27Al7Mo2, etc.) series has the advantages of high service temperature, the maximum service temperature can reach 1400 degrees, long service life, high surface load, good oxidation resistance, high resistivity, and cheap price. At the same time, it also has obvious disadvantages, mainly low high temperature strength, its plasticity increases with the increase of use temperature, the components are easy to deform, and it is not easy to bend and repair.

The main advantages of nickel-chromium electric heating alloy (Cr20Ni80) series are: its tensile strength at high temperature is higher than that of "iron-chromium-aluminum" material, it is not easy to deform under high temperature use, its structure is not easy to change, its plasticity is good, and it is easy to repair. Its radiation rate is high, non-magnetic, strong corrosion resistance, long service life, etc. But its relative disadvantages are: because it is made of relatively rare and expensive nickel metal materials, the price of this series of products is up to several times higher than that of Fe-Cr-Al, and the use temperature is lower than that of Fe-Cr-Al.

No matter what kind of heating wire, their heating mechanism is the same, and its electrothermal conversion efficiency is difficult to break through 90% of the electrothermal conversion efficiency, that is, the ratio of the thermal energy generated to the consumed electrical energy when the heating wire is energized. In addition, Because the melting point of the traditional heating wire is as high as 1300°C, it needs to be heated to a temperature above the melting point during production, which consumes a lot of energy. At the same time, preventing heavy metal pollution will also increase the cost. Therefore, the comprehensive energy consumption of traditional electric heating wires is quite huge. Today, with the increasing calls for energy saving and environmental protection, an electric heating technology with higher energy consumption efficiency, lower cost, and simpler application methods is needed.

Contents of the invention

The main purpose of the present invention is to provide a nano-ceramic electrothermal coating device.

The device of the present invention comprises an insulating base, a nano-electrothermal film and at least two conductive contacts. The insulating base can be in the shape of a flat plate, a tube, or a column. Material, a nano-conductive heat material and a cured material, at least two conductive contacts are arranged on the nano-electric heating film, and are used to connect the positive pole and the negative pole of a power supply through a wire. When the at least two conductive contacts pass through the wire and the power supply When the positive and negative electrodes are connected, the nano electrothermal film can quickly generate heat.

The dielectric material in the nano electrothermal film has a dielectric constant in the range of 900-1800W/M, including barium titanate (BaTiO3), strontium titanate (SrTiO3), lead zirconate titanate (Pb(ZrTi)O3, PZT) , aluminum nitride (AlN), silicon carbide (SiC), etc., as substances that generate resistance heating, and nano-conductive thermal materials are mainly carbon nanotubes or graphene, which are used to quickly import/export heat, and the cured material is oxide At least one of iron, aluminum oxide, chromium oxide, sodium oxide, potassium oxide, silicon oxide, and strontium oxide, wherein the dielectric material accounts for 10% to 35% of the total weight, and the nano-conductive thermal material accounts for 30% of the total weight ~60%, the ratio of the nano-conductive thermal material and the dielectric material can be adjusted according to the required heating power, and the total resistivity is below 4×10-4Ω·cm, and the material of the insulating base can also be adjusted according to the required The heating temperature generation range is selected. The at least two conductive contacts can be formed by various conductive glues such as silver glue, copper glue, gold glue, carbon glue, graphite glue and the like.

The device further includes a temperature control device, which is connected to the positive and negative poles of the power supply and connected to at least two conductive contacts 30 through wires to detect the temperature of the nano electrothermal film and control the open circuit or open circuit to avoid overheating.

Another object of the present invention is to provide a method for manufacturing a nano-ceramic electrothermal coating device, which method includes the steps of making nano-electrothermal slurry, coating step, conductive contact setting step, baking step, cooling and testing step and control chip Connection steps. The production steps of nano electric heating slurry are to fully grind, stir and mix dielectric materials, nano conductive heat materials, additives and solidified materials to form a slurry, and then cool and concentrate to form a colloidal nano electric heating slurry, wherein the additives are toluene, At least one of ethanol and glycerin, and the solidified material is at least one of iron oxide, aluminum oxide, chromium oxide, sodium oxide, potassium oxide, silicon oxide, and strontium oxide, used as a catalyst. The coating step is to uniformly coat the nano electric heating slurry on one surface of the insulating base, and form a nano electric heating film after drying, and the coating method can be at least one of roll coating, spray coating or spin coating .

The step of arranging the conductive contacts is to form at least two conductive contacts on the nano electrothermal film by printing conductive glue. The baking step is to put the completed nano-ceramic electrothermal coating device into an oven to bake, so as to increase the mechanical strength of at least two conductive contacts, and fully volatilize the additives in the nano-electrothermal film to make the structure more uniform. The temperature is 400-600°C, preferably 450-480°C, and the baking time is 1-5 hours, preferably 2-3 hours. The cooling and testing step is to cool the nano-ceramic electrothermal coating device to room temperature, and test the adhesion and conductivity. Further, the manufacturing method of the nano-ceramic electrothermal coating device of the present invention also includes a step of connecting the temperature control device, connecting the control chip to at least two conductive contacts through wires.

The feature of the present invention is that the nano electrothermal film is a quasi-nano-scale metal oxide transparent conductive film, which has excellent acid and alkali corrosion resistance, high hardness comparable to quartz and topaz, and a resistivity as low as 4×10-4 Ω·cm or less , the power density can reach 40W/cm2, the visible light transmittance is greater than 93%, the safe working temperature is as high as 650°C, the service life is as long as 50,000 hours, the electric heat conversion efficiency is nearly 98.2%, and the production process only needs to be lower than 800°C Compared with the heating tubes or electric heating wires made of alloys such as nickel-iron-aluminum in the prior art, the present invention has the effect of instant heating in a short time, which can save electric energy, and can be used in large quantities in In industrial or household electric heating devices, such as heating pipes of washing machines, kettles, electric stoves, etc. Furthermore, the device occupies a smaller volume, which can reduce the weight of the original heating wire or heating tube, contribute to the lightweight design of the product, and indirectly reduce the power consumption of the manufacturing process and reduce the subsequent transportation cost.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the first embodiment of the nano-ceramic electrothermal coating device of the present invention.

Fig. 2 is a schematic cross-sectional view of the second embodiment of the nano-ceramic electrothermal coating device of the present invention.

Fig. 3 is a flow chart of the manufacturing method of the nano-ceramic electrothermal coating device of the present invention.

Detailed ways

The implementation of the present invention will be described in more detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it after studying this specification.

Referring to FIG. 1 , it is a schematic cross-sectional view of the first embodiment of the nano-ceramic electrothermal coating device of the present invention. As shown in Figure 1, the nano ceramic electrothermal coating device 1 of the present invention includes an insulating base 10, a nano electrothermal film 20 and at least two conductive contacts 30, the insulating base 10 can be flat, tubular, columnar, nano electrothermal The film 20 is arranged on one surface of the insulating base 10, and is composed of a dielectric material, a nano-conducting thermal material and a cured material. At least two conductive contacts 30 are provided on the nano-electrothermal film 20 for transmitting The wire is connected to the positive pole and the negative pole of a power supply, and when the at least two conductive contacts 30 are connected to the positive pole and the negative pole of the power supply through the wire, the nano electrothermal film 20 can quickly generate heat energy.

The dielectric material in the nano electrothermal film 20 has a dielectric constant in the range of 900-1800W/M, mainly including barium titanate (BaTiO3), strontium titanate (SrTiO3), lead zirconate titanate (Pb(ZrTi)O3, PZT), aluminum nitride (AlN), silicon carbide (SiC), etc., as substances that generate resistance heating, and nano-conductive thermal materials are mainly carbon nanotubes or graphene, which are used to quickly import/export heat and cure materials It is at least one of iron oxide, aluminum oxide, chromium oxide, sodium oxide, potassium oxide, silicon oxide, and strontium oxide, wherein the dielectric material accounts for 10% to 35% of the total weight, and the nano-conductive thermal material accounts for the total weight 30% to 60% of the total resistivity of the nano electrothermal film 20 is below 4×10-4 Ω·cm. The proportion of the nano-conducting thermal material and the dielectric material can be adjusted according to the required heating power, and the material of the insulating base can also be selected according to the required heating temperature range. The at least two conductive contacts 30 can be formed by various conductive glues such as silver glue, copper glue, gold glue, carbon glue, graphite glue, and the like.

Referring to FIG. 2 , it is a schematic cross-sectional view of the second embodiment of the nano-ceramic electrothermal coating device of the present invention. Compared with the first embodiment, the second embodiment of the present invention further includes a temperature control device 40, the temperature control device 40 is connected to the positive and negative poles of the power supply, and is connected to at least two conductive contacts 30 through wires. To detect the temperature of the nano electrothermal film 20, and control the open circuit or disconnection of the current to avoid overheating.

Referring to FIG. 3 , it is a flow chart of the manufacturing method of the nano-ceramic electrothermal coating device of the present invention. As shown in Figure 3, the manufacturing method S1 of the nano-ceramic electrothermal coating device of the present invention comprises nano-electrothermal slurry preparation step S10, coating step S20, conductive contact setting step S30, baking step S40, cooling and testing step S50 and Control chip connection step S60. Nano electrothermal slurry production step S10 is to fully grind the dielectric material, nano conductive thermal material, additives and catalyst first, stir and mix them into a slurry, then cool and concentrate to form a colloidal nano electrothermal slurry, wherein the additives are toluene, At least one of ethanol and glycerin, and the solidified material is at least one of iron oxide, aluminum oxide, chromium oxide, sodium oxide, potassium oxide, silicon oxide, and strontium oxide, used as a catalyst. The coating step S20 is to uniformly coat the nano electric heating slurry on one surface of the insulating base, and form a nano electric heating film after drying, and the coating method can be at least one of roll coating, spray coating or spin coating one.

The conductive contact setting step S30 is to form at least two conductive contacts on the nano electrothermal film by printing conductive glue. The baking step S40 is to bake the completed nano ceramic electrothermal coating device in an oven to increase the mechanical strength of at least two conductive contacts, and to fully volatilize the additives in the nano electrothermal film to make the structure more uniform, wherein The baking temperature is 400-600°C, preferably 450-480°C, and the baking time is 1-5 hours, preferably 2-3 hours. The cooling and testing step S50 is to cool down the nano-ceramic electrothermal coating device to room temperature, and test the adhesion and conductivity. Further, the manufacturing method S1 of the nano-ceramic electrothermal coating device of the present invention also includes a control chip connection step S60, connecting the control chip to at least two conductive contacts through wires.

The feature of the present invention is that the nano electrothermal film is a quasi-nano-scale metal oxide transparent conductive film, which has excellent acid and alkali corrosion resistance, high hardness equivalent to quartz and topaz, and a resistivity as low as 4×10-4Ω·cm. The power density can reach 40W/cm2, the visible light transmittance is greater than 93%, the safe working temperature is as high as 650°C, the service life is as long as 50,000 hours, and the electric heat conversion efficiency is nearly 98.2%, and the production process only needs to be lower than 800°C. In the industrial medium temperature environment, compared with the heating tube or electric heating wire made of alloys such as nickel-iron-aluminum in the prior art, the present invention can achieve the effect of instant heating in a short time, and can save electric energy, and can be used in large quantities in industrial In household or household electrical heating devices, such as heating pipes of washing machines, kettles, electric stoves, etc. Furthermore, the device occupies a smaller volume, which can reduce the weight of the original heating wire or heating tube, contribute to the lightweight design of the product, and indirectly reduce the power consumption of the manufacturing process and reduce the subsequent transportation cost.

The above descriptions are only preferred embodiments for explaining the present invention, and are not intended to limit the present invention in any form. Therefore, any modification or change of the present invention made under the same creative spirit will be accepted. Still should be included in the category that the present invention intends to protect.

Claims (10)

1. A nano-ceramic electrothermal coating device, characterized in that it comprises: an insulating base; A nanometer electrothermal film, disposed on a surface of the insulating base, is composed of a dielectric material, a nanometer conductive heat material and a cured material; and At least two conductive contacts are formed with a conductive glue and arranged on the nano electrothermal film for connecting a positive pole and a negative pole of a power supply through wires, Wherein, the dielectric material accounts for 10%-35% of the total weight, and the nano-conductive thermal material accounts for 30-60% of the total weight, and the resistivity of the nano-electrothermal film is below 4×10-4Ω·cm. 2. The nano-ceramic electrothermal coating device as claimed in claim 1, wherein the dielectric constant of the dielectric material is in the range of 900 to 1800W/M, including barium titanate, strontium titanate, lead zirconate titanate , aluminum nitride, silicon carbide at least one of them, and the thermally conductive material is at least one of carbon nanotubes and graphene, wherein the solidified material is iron oxide, aluminum oxide, chromium oxide, sodium oxide, oxide At least one of potassium, silicon oxide, and strontium oxide. 3. The nano-ceramic electrothermal coating device as claimed in claim 1, wherein a temperature control device is further arranged between the power supply and the at least two conductive contacts for sensing the temperature of the nano-electrothermal film and controlling An open or interrupted circuit. 4. The nano-ceramic electrothermal coating device according to claim 1, wherein the insulating base is flat, tubular or columnar, and the conductive glue is silver glue, copper glue, gold glue, carbon glue, graphite glue at least one of the . 5. A method for manufacturing a nano-ceramic electrothermal coating device, characterized in that the steps include: A nanometer electrothermal paste production step is to fully grind a dielectric material, a nanometer conductive heat material, a solidified material, and an additive to form a slurry, then cool and concentrate to form a gel-like nanometer electric paste; A coating step is to uniformly coat the nano electrothermal paste on a surface of an insulating base, and form a nano electrothermal film after drying; A conductive contact setting step is to form at least two conductive contacts on the nano electrothermal film by printing a conductive glue to form a nano ceramic electrothermal coating device; A baking step is to put the nano ceramic electrothermal coating device into an oven and bake to remove the additive in the nano electrothermal film; and A cooling and testing step is to cool the nano-ceramic electrothermal coating device to room temperature and test it. 6. The method according to claim 5, further comprising a step of connecting a temperature control device, connecting a temperature control device to at least two conductive contacts through wires. 7 . The method according to claim 5 , wherein the dielectric material accounts for 10% to 35% of the total weight of the nanometer electrothermal film, and the nanometer heat conducting material accounts for 30% to 60% of the total weight. 8. The method according to claim 5, wherein the additive is at least one of toluene, ethanol and glycerin, and the solidified material is, as a catalyst, iron oxide, aluminum oxide, chromium oxide, sodium oxide, potassium oxide At least one of silicon oxide and strontium oxide. The dielectric constant of the dielectric material is in the range of 1000-1800W/M, including barium titanate, strontium titanate, lead zirconate titanate, aluminum nitride, and silicon carbide. At least one of them, and the thermally conductive material is at least one of carbon nanotubes and graphene. 9. The method according to claim 5, characterized in that, the method of the coating step is at least one of roll coating, spray coating or spin coating, the baking temperature of the baking step is 400-600°C, Baking time is 1-5 hours. 10. The method according to claim 5, wherein the insulating base can be flat, tubular or columnar, and the conductive glue is at least one of silver glue, copper glue, gold glue, carbon glue, and graphite glue one.

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