Ceramic roller for cooling, preparation method of ceramic roller and coating system

Abstract

The invention provides a ceramic roller for cooling, a preparation method of the ceramic roller and a film coating system, and belongs to the technical field of film material manufacturing. The preparation method of the ceramic roller for cooling comprises the following steps: providing a metal roller blank, wherein the surface of the metal roller blank is provided with a metal layer made of Al and / or Al alloy; with the metal roller blank as an anode, an aluminum oxide ceramic layer with the thickness smaller than or equal to 100 microns is formed on the surface of the metal layer in an anodic oxidation mode, and a ceramic roller intermediate is obtained; the surface of the aluminum oxide ceramic layer of the ceramic roller intermediate is sequentially subjected to organic hole sealing treatment and grinding and polishing treatment, the ceramic roller for cooling is obtained, the ceramic roller for cooling can generate large acting force between the ceramic layer and the membrane material after being electrified, so that the membrane material and the ceramic layer are tightly and fully attached, and the service life of the membrane material is prolonged. In addition, the ceramic layer is compact, so that a good cooling effect can be provided for the membrane material, and the yield and the productivity of products are improved.

Description

Technical Field

[0001] The present application relates to the technical field of film material manufacturing, and in particular to a cooling ceramic roller and a preparation method and a coating system thereof. Background Art

[0002] With the rapid development of the new energy industry, the demand for new composite materials based on polymer film materials is becoming more and more obvious, such as the development of composite current collectors and their wide application in secondary batteries. The preparation of composite current collectors usually uses a thin sheet of polymer film as the base film, and then forms a conductive metal layer on the base film through a coating device (such as winding evaporation coating or magnetron sputtering coating, etc.). Among them, due to the high temperature generated during the coating process, it is easy to cause the film material to be burned, wrinkled or even broken during the preparation process. In order to ensure the preparation of a higher quality composite current collector, a cooling ceramic roller is usually required. Specifically, a ceramic roller (a channel for conveying heat exchange medium is provided in the roller body, the roller body is a conductive material, and the roller body surface is an insulating ceramic layer) is connected to the positive or negative pole, and the conductive metal layer on the film material is connected to the opposite negative or positive voltage. The ceramic roller and the conductive metal layer of the film material form a bias voltage, and a polarity charge is formed on the ceramic layer side, and a corresponding reverse polarity charge is formed on the film material side. The electrostatic adsorption of the two polarities can make the film material tightly adhere to the surface of the ceramic layer during the preparation process, so as to quickly cool the film material through heat exchange. However, the ceramic layer in the existing cooling ceramic roller is usually formed by a plasma spraying process, which has the problem of small electrostatic adsorption force, making it difficult for the film material and the ceramic layer to fit tightly and fully. In addition, the ceramic layer prepared by this process has poor density (weak thermal conductivity), resulting in poor cooling effect on the film material, which in turn affects the product yield and production capacity. Summary of the invention

[0003] The purpose of the present application is to provide a cooling ceramic roller and its preparation method and coating system. The cooling ceramic roller can generate a large force between the ceramic layer and the film material after being energized, so that the film material and the ceramic layer are tightly and fully fitted. In addition, the ceramic layer is relatively dense, which can provide a better cooling effect for the film material, thereby improving the product yield and production capacity.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a method for preparing a cooling ceramic roller, comprising the following steps:

[0006] A metal roller embryo is provided, wherein the interior of the metal roller embryo has a channel for conveying a coolant, and the surface of the metal roller embryo has a metal layer made of Al and / or Al alloy; the metal roller embryo is used as an anode, and an alumina ceramic layer with a thickness of ≤100 μm is formed on the surface of the metal layer by anodizing to obtain a ceramic roller intermediate; the surface of the alumina ceramic layer of the ceramic roller intermediate is subjected to an organic sealing treatment and a grinding and polishing treatment in sequence to obtain a cooling ceramic roller.

[0007] In the above technical solution, in the preparation process of the cooling ceramic roller, the ceramic layer is usually formed by a plasma spraying process, and the thickness of the ceramic layer is usually above 100 μm (the ceramic layer is too thick, and the electrostatic adsorption force formed between the ceramic layer and the film material after power is turned on is weak) and there is a problem of poor density (poor thermal conductivity), which makes it difficult to quickly and effectively cool the film material. In this application, the anodizing technology is innovatively applied to the preparation process of the cooling ceramic roller. The thickness of the ceramic layer formed by this method is small and controllable (the thickness of the ceramic layer is small, and the electrostatic adsorption force formed between the ceramic layer and the film material after power is turned on is strong), and the ceramic layer formed by this method has a high density (good thermal conductivity), so that the cooling ceramic roller can be tightly and fully bonded to the film material after power is turned on (the better the bonding effect, the more sufficient the heat transfer, and the better the cooling effect), and the ceramic layer has a relatively excellent thermal conductivity, which can provide a good cooling effect for the film material, so as to improve the yield and production capacity of the product.

[0008] In some optional embodiments, the thickness of the alumina ceramic layer is 30-70 μm.

[0009] In the above technical scheme, the lower limit of the thickness of the alumina ceramic layer is to enable it to have a more suitable voltage resistance, thereby improving the problem that the alumina ceramic layer may be broken down by voltage after power is applied; the upper limit of the thickness of the alumina ceramic layer is to be able to form a larger electrostatic adsorption force between the alumina ceramic layer and the membrane material after power is applied and also have better thermal conductivity, thereby improving the cooling effect of the membrane material.

[0010] In some optional embodiments, in the step of forming an aluminum oxide ceramic layer on the surface of the metal layer by anodizing, the treatment temperature is 22 to 24° C., the treatment time is 25 to 35 min, and the current density is 0.5 to 2 A / mm 2 , the molar concentration of hydrogen ions in the electrolyte is 3~4.1mol / L.

[0011] In the above technical scheme, during the anodizing process, the processing temperature, processing time, current density and the molar concentration of hydrogen ions in the electrolyte are limited to specific ranges respectively, so that a ceramic layer with uniform thickness, high density and a thickness in the range of 30 to 70 μm can be conveniently and efficiently formed on the surface of the metal layer, so that it can form a large electrostatic adsorption force with the membrane material after power is turned on and also have relatively excellent thermal conductivity.

[0012] In some optional embodiments, in the step of grinding and polishing, at least one of the following conditions A to C is met:

[0013] A until the roughness of the alumina ceramic layer Ra ≤ 0.2μm.

[0014] B until the thickness uniformity deviation of the alumina ceramic layer is less than ±15%.

[0015] C until the surface flatness deviation of the alumina ceramic layer is less than ±20μm.

[0016] In the above technical scheme, during the grinding and polishing process, the roughness, thickness uniformity deviation and surface flatness deviation of the alumina ceramic layer are respectively limited within the above ranges, which can make the ceramic layer and the membrane material fit more closely and fully after power is turned on, thereby improving the cooling effect on the membrane material. At the same time, it can also make the cooling rate of each area of ​​the membrane material more consistent, thereby improving the quality of the product.

[0017] In a second aspect, an embodiment of the present application provides a cooling ceramic roller, which is prepared using the preparation method of the cooling ceramic roller provided in the embodiment of the first aspect.

[0018] In the above technical scheme, the cooling ceramic roller is prepared by the preparation method of the cooling ceramic roller provided in the embodiment of the first aspect. The cooling ceramic roller has the advantages of small thickness and high density. After power is turned on, it can fit tightly and fully with the film material (the better the fitting effect, the more complete the heat transfer, and the better the cooling effect). In addition, the ceramic layer has relatively excellent thermal conductivity, which can provide a better cooling effect for the film material, thereby improving the product yield and production capacity.

[0019] In a third aspect, an embodiment of the present application provides a coating system, comprising a cooling ceramic roller as provided in the embodiment of the second aspect.

[0020] In the above technical scheme, the coating system includes a cooling ceramic roller as provided in the second aspect embodiment. Since the ceramic layer on the ceramic roller is prepared by anodizing, it has the advantages of small thickness and high density. After power is turned on, it can fit tightly and fully with the film material (the better the fitting effect, the more complete the heat transfer, and the better the cooling effect). In addition, the ceramic layer has relatively excellent thermal conductivity, which can provide a better cooling effect for the film material, thereby improving the product yield and the production capacity of the coating system.

[0021] In some optional embodiments, the coating system includes a coating source, a plurality of cooling ceramic rollers and a plurality of passing rollers, each of the cooling ceramic rollers has a diameter of 100 to 300 mm, the plurality of cooling ceramic rollers are located above the coating source and are spaced apart in sequence, the plurality of cooling ceramic rollers extend from one side of the coating area of ​​the coating source to the other opposite side to cover the entire coating area, a passing roller is arranged between two adjacent cooling ceramic rollers, and the passing roller is located on the side of the cooling ceramic roller away from the coating source.

[0022] In the above technical scheme, a single cooling ceramic roller with a large diameter is usually used in the current coating system. This type of coating system is usually difficult to cover the entire coating area of ​​the coating source, which will cause a large amount of raw material waste. In addition, during the transportation of the film material, under the same film roll tension, the radial pressure applied by the film roll on the surface of the ceramic roller is inversely proportional to its diameter. When a single cooling ceramic roller with a large diameter is used, the radial force applied by the film material on the large diameter cooling ceramic roller is small, resulting in poor bonding between the two, which in turn affects the cooling effect of the film material. In the present application, a plurality of small-diameter cooling ceramic rollers are used and the plurality of cooling ceramic rollers are arranged to extend from one side of the coating area of ​​the coating source to the other opposite side to cover the entire coating area, which can improve the raw material utilization rate of the coating source and thus reduce the coating cost; at the same time, compared with the large-diameter single-roller form, the use of a small-diameter multi-roller form can also help improve the uniformity of the coating and facilitate precise control of the thickness of the coating; and, by setting up a plurality of small-diameter cooling ceramic rollers, relative to setting up a single large-diameter cooling ceramic roller, it is also possible to increase the radial force exerted by the film material on the cooling ceramic roller under the same film roll tension, so that the two can fit better, thereby improving the cooling effect on the film material; in addition, the passing roller between two adjacent cooling ceramic rollers is located on the side of the cooling ceramic roller away from the coating source, so that the raw material can reach the base film conveniently and quickly, thereby improving the coating efficiency and also helping to reduce raw material waste.

[0023] In some optional embodiments, the coating system is a roll-to-roll evaporation coating system, there is one coating source, and the distances from the geometric centers of the plurality of cooling ceramic rollers to the geometric center of the coating source are all 50 to 150 cm.

[0024] In the above technical scheme, when the coating system is a winding evaporation coating system, the distance from the geometric center of each cooling ceramic roller to the geometric center of the coating source is limited to a specific range, which can better receive the atomic particles from the coating source, thereby facilitating the formation of a conductive metal layer; at the same time, the appropriate distance also helps to reduce part of the heat of the atomic particles during the transportation process, thereby reducing the temperature of the atomic particles when they reach the surface of the film material, that is, reducing the source temperature, thereby preparing a high-quality composite current collector.

[0025] In some optional embodiments, the distances from the geometric centers of the plurality of cooling ceramic rollers to the geometric center of the coating source are all equal.

[0026] In the above technical scheme, the distances from the geometric centers of multiple cooling ceramic rollers to the geometric center of the coating source are set to be the same, that is, the multiple cooling ceramic rollers are distributed in an arc shape with equal spacing around the coating source, which has the advantage of a more regular structural design. At the same time, the film materials on the multiple cooling ceramic rollers can also receive atomic particles from the coating source at equal spacing, thereby improving the coating uniformity of the atomic particles to prepare a conductive metal layer with relatively uniform thickness.

[0027] In some optional embodiments, the coating system is a magnetron sputtering coating system, there are multiple coating sources, and multiple cooling ceramic rollers are all located above the coating sources and are distributed in sequence at intervals in the horizontal direction.

[0028] In the above technical scheme, when the coating system is a magnetron sputtering coating system, multiple cooling ceramic rollers are located above the coating source and are arranged to be distributed in sequence in the horizontal direction, that is, multiple cooling ceramic rollers are distributed horizontally side by side, and the shape of the cavity can be set to a rectangle, which has the advantages of small space occupation, easy preparation and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A process flow chart of a method for preparing a cooling ceramic roller provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of a first cooling ceramic roller provided in an embodiment of the present application;

[0032] Figure 3A schematic diagram of the structure of a second cooling ceramic roller provided in an embodiment of the present application;

[0033] Figure 4 A schematic structural diagram of a first coating system provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the structure of a second coating system provided in an embodiment of the present application.

[0035] Icons: 100 - Ceramic roller for cooling; 110 - Metal roller blank; 110a - Substrate; 110b - Al metal layer; 111 - Liquid outlet channel; 112 - Liquid inlet channel; 120 - Alumina ceramic layer; 10 - Coating system; 200 - Coating source; 300 - Roller; 400 - Baffle. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present application, it should be noted that the terms "center", "up", "down", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The following is a detailed description of a cooling ceramic roller and its preparation method and coating system of the present application.

[0043] In a first aspect, an embodiment of the present application provides a method for preparing a cooling ceramic roller, comprising the following steps:

[0044] A metal roller embryo is provided, wherein the interior of the metal roller embryo has a channel for conveying a coolant, and the surface of the metal roller embryo has a metal layer made of Al and / or Al alloy; the metal roller embryo is used as an anode, and an alumina ceramic layer with a thickness of ≤100 μm is formed on the surface of the metal layer by anodizing to obtain a ceramic roller intermediate; the surface of the alumina ceramic layer of the ceramic roller intermediate is subjected to an organic sealing treatment and a grinding and polishing treatment in sequence to obtain a cooling ceramic roller.

[0045] In the prior art, the preparation process of cooling ceramic rollers mainly adopts plasma spraying technology. Specifically, on the flattened and cleaned metal roller embryo, a metal bonding layer is first sprayed on the clean roller embryo surface by plasma spraying technology, and then a ceramic layer is sprayed on the bonding layer by plasma spraying technology, and then the surface of the ceramic layer is subjected to organic sealing treatment and grinding and polishing treatment in turn to form a ceramic layer with a thickness of more than 100μm. The ceramic layer of the cooling ceramic roller prepared by this process is too thick, and the electrostatic adsorption force formed between the cooling ceramic roller and the film material after power is turned on is weak, and there is a problem of poor density (poor thermal conductivity), which makes it difficult to quickly and effectively cool the film material. In the present application, anodizing technology is innovatively applied to the preparation process of cooling ceramic rollers. The thickness of the ceramic layer formed by this method is small and controllable (the thickness of the ceramic layer is small, and the electrostatic adsorption force formed between the film material and the layer after power is turned on is strong), and the ceramic layer formed by this method has high density (good thermal conductivity), so that the cooling ceramic roller can fit tightly and fully with the film material after power is turned on (the better the fitting effect, the more complete the heat transfer, and the better the cooling effect). In addition, the ceramic layer has relatively excellent thermal conductivity, which can provide a better cooling effect for the film material, thereby improving the product yield and production capacity.

[0046] It should be noted that although anodizing technology is a common technology for preparing ceramic layers, the purpose of using this technology to prepare ceramic layers is mostly to modify the substrate itself, such as improving the wear resistance, corrosion resistance, impact resistance or hardness of the substrate itself. So far, the inventor has not found any reports on the application of this technology in a coating system and for the preparation of cooling ceramic rollers. Therefore, in this application, the inventor innovatively applies anodizing technology to the preparation process of cooling ceramic rollers to solve the problem that existing cooling ceramic rollers cannot achieve rapid and effective cooling of film materials, which is a major innovation in this field.

[0047] It should be noted that the configuration of the metal roller blank is not limited and can be adaptively adjusted according to actual needs. For example, the material of the metal roller blank is entirely Al material, that is, the metal roller blank is an integrated structure; the metal roller blank can also be set as a combination of different materials, for example, the material of the base (with a channel for conveying coolant inside) is stainless steel, and an Al metal layer is provided on the outer peripheral wall of the stainless steel.

[0048] As an example, the thickness of the alumina ceramic layer is 30-70 μm, for example but not limited to any one of 30 μm, 40 μm, 50 μm, 60 μm and 70 μm, or a range between any two of the thicknesses.

[0049] In this embodiment, the lower limit of the thickness of the alumina ceramic layer is to enable it to have a more suitable voltage resistance, thereby improving the problem that the alumina ceramic layer may be broken down by voltage after power is turned on; the upper limit of the thickness of the alumina ceramic layer is to be able to form a larger electrostatic adsorption force between the alumina ceramic layer and the membrane material after power is turned on and also have a relatively excellent thermal conductivity, thereby improving the cooling effect on the membrane material.

[0050] As an example, in the step of forming an aluminum oxide ceramic layer on the surface of the metal layer by anodizing, the treatment temperature is 22-24°C, for example but not limited to the treatment temperature is any one of 22°C, 22.5°C, 23°C, 23.5°C and 24°C or a range between any two of them; the treatment time is 25-35min, for example but not limited to the treatment time is any one of 25min, 26min, 27min, 28min, 29min, 30min, 31min, 32min, 33min, 34min and 35min or a range between any two of them; the current density is 0.5-2A / mm 2 , for example but not limited to a current density of 0.5A / mm 2 , 1A / mm 2 , 1.5A / mm 2 and 2A / mm 2 any point value in or a range between any two of the above; the molar concentration of hydrogen ions in the electrolyte is 3-4.1 mol / L, for example, but not limited to, the molar concentration of hydrogen ions is 3 mol / L, 3.1 mol / L, 3.2 mol / L, 3.3 mol / L, 3.4 mol / L, 3.5 mol / L, 3.6 mol / L, 3.7 mol / L, 3.8 mol / L, 3.9 mol / L, 4.0 mol / L and 4.1 mol / L, or any point value in or a range between any two of the above.

[0051] In this embodiment, during the anodization process, the treatment temperature, treatment time, current density and the molar concentration of hydrogen ions in the electrolyte are respectively limited within specific ranges, so that a ceramic layer with uniform thickness, high density and a thickness in the range of 30 to 70 μm can be conveniently and efficiently formed on the surface of the metal layer, so that it can form a large electrostatic adsorption force with the film material after power is turned on and also have relatively excellent thermal conductivity.

[0052] As an example, in the step of grinding and polishing, at least one of the following conditions A to C is met:

[0053] A until the roughness of the alumina ceramic layer Ra ≤ 0.2μm.

[0054] B until the thickness uniformity deviation of the alumina ceramic layer is less than ±15%.

[0055] C until the surface flatness deviation of the alumina ceramic layer is less than ±20μm.

[0056] In this embodiment, during the grinding and polishing process, the roughness, thickness uniformity deviation and surface flatness deviation of the alumina ceramic layer are respectively limited within the above ranges, so that the ceramic layer and the membrane material can fit more closely and fully after power is turned on, thereby improving the cooling effect on the membrane material. At the same time, the cooling rate of each area of ​​the membrane material can be more consistent, thereby improving the quality of the composite current collector.

[0057] It should be noted that any process or step not specifically described or limited in the preparation process of the cooling ceramic roller may be arranged according to conventional selection in the art.

[0058] As an example, the process flow chart of the preparation method of the cooling ceramic roller is shown as follows: Figure 1 described.

[0059] In a second aspect, an embodiment of the present application provides a cooling ceramic roller, which is prepared using the preparation method of the cooling ceramic roller provided in the embodiment of the first aspect.

[0060] In the present application, the cooling ceramic roller is prepared by the preparation method of the cooling ceramic roller provided in the embodiment of the first aspect. The cooling ceramic roller has the advantages of small thickness and high density. After power is turned on, it can fit tightly and fully with the film material (the better the fitting effect, the more complete the heat transfer, and the better the cooling effect). In addition, the ceramic layer has relatively excellent thermal conductivity, which can provide a better cooling effect for the film material, thereby improving the product yield and production capacity.

[0061] In order to better understand the technical solution, two specific structural schematic diagrams of cooling ceramic rollers 100 are combined here for auxiliary explanation. Figure 2 and Figure 3 ,in, Figure 2 The material of the corresponding metal roller blank 110 is in the form of Al metal. Specifically, the cooling ceramic roller 100 includes the metal roller blank 110 and an alumina ceramic layer 120 on the surface. A channel for conveying coolant is provided in the metal roller blank 110, and a liquid outlet channel 111 is located between the liquid inlet channel 112 and the alumina ceramic layer 120. Figure 3The material of the corresponding metal roller blank 110 is a combination of a base 110a made of stainless steel and an Al metal layer 110b. Specifically, the cooling ceramic roller 100 includes a metal roller blank 110 and an alumina ceramic layer 120 on the surface, wherein the metal roller blank 110 includes a base 110a and an Al metal layer 110b located on the surface of the base 110a, the alumina ceramic layer 120 is located on the surface of the Al metal layer 110b, a channel for conveying coolant is opened in the base 110a, and the liquid outlet channel 111 is located between the liquid inlet channel 112 and the alumina ceramic layer 120.

[0062] In a third aspect, an embodiment of the present application provides a coating system, comprising a cooling ceramic roller as provided in the embodiment of the second aspect.

[0063] In this embodiment, the coating system includes a cooling ceramic roller as provided in the second aspect embodiment. Since the ceramic layer on the ceramic roller is prepared by anodizing, it has the advantages of small thickness and high density. After power is turned on, it can fit tightly and fully with the film material (the better the fitting effect, the more complete the heat transfer, and the better the cooling effect). In addition, the ceramic layer has relatively excellent thermal conductivity, which can provide a better cooling effect for the film material, thereby improving the product yield and the production capacity of the coating system.

[0064] In addition, the inventors also found that: the current coating system usually uses a large-diameter single cooling ceramic roller. This type of coating system is usually difficult to cover the entire coating area of ​​the coating source, which will cause a large amount of raw material waste; in addition, during the transportation of the film material, under the same film roll tension, the radial pressure applied by the film roll on the surface of the ceramic roller is inversely proportional to its diameter, so when a large-diameter single cooling ceramic roller is used, the radial force applied by the film material to the large-diameter cooling ceramic roller is small, resulting in poor bonding between the two, which in turn affects the cooling effect of the film material, making it difficult for the corresponding coating system to meet the coating requirements of the composite current collector. Based on this, considering the preparation cost and product yield, the inventors also optimized the structure of the coating system.

[0065] See also Figure 4 and Figure 5As an example, the coating system 10 includes a coating source 200, a plurality of cooling ceramic rollers 100 and a plurality of passing rollers 300, the diameter of each cooling ceramic roller 100 is 100 to 300 mm (for example, but not limited to, any one of the diameters of 100 mm, 150 mm, 200 mm, 250 mm and 300 mm or a range between any two of them), the plurality of cooling ceramic rollers 100 are all located above the coating source 200 and are spaced apart in sequence, the plurality of cooling ceramic rollers 100 extend from one side of the coating area of ​​the coating source 200 to the other opposite side to cover the entire coating area, a passing roller 300 is arranged between two adjacent cooling ceramic rollers 100, and the passing roller 300 is located on the side of the cooling ceramic roller 100 away from the coating source 200.

[0066] In this embodiment, a plurality of small-diameter cooling ceramic rollers 100 are used and the plurality of cooling ceramic rollers 100 are arranged to extend from one side of the coating area of ​​the coating source 200 to the other opposite side to cover the entire coating area, which can improve the raw material utilization rate of the coating source 200, thereby reducing the coating cost; at the same time, compared with the large-diameter single-roller form, the small-diameter multi-roller form is also helpful to improve the uniformity of the coating and facilitate the precise control of the thickness of the coating; and, the provision of a plurality of small-diameter cooling ceramic rollers 100 can increase the radial force exerted by the film material on the cooling ceramic roller 100 under the same film roll tension relative to the provision of a single large-diameter cooling ceramic roller 100, so that the two can better fit, thereby improving the cooling effect on the film material, and helping to improve the product yield; in addition, the passing roller 300 between two adjacent cooling ceramic rollers 100 is located on the side of the cooling ceramic roller 100 away from the coating source 200, so that the raw material can reach the base film conveniently and quickly, thereby improving the coating efficiency and also helping to reduce the waste of raw materials.

[0067] It should be noted that the specific type of coating system is not limited, as long as it is a coating system that requires cooling ceramic rollers for auxiliary cooling, such as the commonly used winding evaporation coating system and magnetron sputtering coating system, etc., which can be adaptively adjusted according to actual needs.

[0068] See also Figure 4 As an example, the coating system 10 is a roll-to-roll evaporation coating system, and there is one coating source 200 (it should be noted that in other possible embodiments, there may be multiple coating sources 200), and the distance from the geometric center of the multiple cooling ceramic rollers 100 to the geometric center of the coating source 200 is 50 to 150 cm, for example but not limited to any point value of 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 100 cm, 110 cm, 120 cm, 130 cm, 140 cm and 150 cm, or a range value between any two of them.

[0069] In this embodiment, when the coating system 10 is a winding evaporation coating system, the distance from the geometric center of each cooling ceramic roller 100 to the geometric center of the coating source 200 is limited to a specific range, which can better receive the atomic particles from the coating source 200, thereby facilitating the formation of a conductive metal layer; at the same time, the appropriate distance also helps to reduce part of the heat of the atomic particles during the transportation process, thereby reducing the temperature of the atomic particles when they reach the surface of the film material, that is, reducing the source temperature, thereby preparing a high-quality composite current collector.

[0070] See also Figure 4 As an example, the distances from the geometric centers of the plurality of cooling ceramic rollers 100 to the geometric center of the coating source 200 are all equal.

[0071] In this embodiment, the distances from the geometric centers of the plurality of cooling ceramic rollers 100 to the geometric center of the coating source 200 are set to be the same, that is, the plurality of cooling ceramic rollers 100 are distributed in arcs with equal spacing around the coating source 200, which has the advantage of a more regular structural design. At the same time, the film materials on the plurality of cooling ceramic rollers 100 can also receive atomic particles from the coating source 200 at equal spacings, thereby improving the coating uniformity of the atomic particles to prepare a conductive metal layer with a relatively uniform thickness.

[0072] See also Figure 5 As an example, the coating system 10 is a magnetron sputtering coating system, and there are multiple coating sources 200 (it should be noted that in other possible embodiments, the coating source 200 can also be one), and multiple cooling ceramic rollers 100 are all located above the coating source 200 and are distributed in sequence in the horizontal direction.

[0073] In this embodiment, when the coating system 10 is a magnetron sputtering coating system, multiple cooling ceramic rollers 100 are located above the coating source 200 and are arranged to be distributed in sequence along the horizontal direction, that is, multiple cooling ceramic rollers 100 are distributed horizontally side by side, and the shape of the cavity can be set to a rectangle, which has the advantages of small space occupation, easy preparation and low manufacturing cost.

[0074] It should be noted that any structural or functional unit not specifically described or limited in each coating system 10 may be configured according to conventional selections in the art.

[0075] As an example, a baffle 400 for shielding atomic particles is also provided between two adjacent cooling ceramic rollers 100 . The baffle 400 is located on the side of the cooling ceramic roller 100 away from the coating source 200 , and the baffle 400 is located between the passing roller 300 and the cooling ceramic roller 100 .

[0076] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0077] Example 1

[0078] The present invention provides a method for preparing a cooling ceramic roller, comprising the following steps:

[0079] Provide a metal roller blank made of Al metal and with a diameter of 250mm. The metal roller blank has a channel for conveying coolant inside. For details, please refer to Figure 2 The metal roller embryo is used as the anode, and the aluminum ceramic layer is oxidized on the surface of the metal layer by anodizing. In the anodizing step, the treatment temperature is 23°C, the treatment time is 30 minutes, and the current density is 1A / mm 2 , the molar concentration of hydrogen ions in the electrolyte is 3.5 mol / L, and a ceramic roller intermediate having an alumina ceramic layer with a thickness of 60 μm is obtained; the surface of the alumina ceramic layer of the ceramic roller intermediate is subjected to organic sealing treatment and grinding and polishing treatment in sequence, wherein, in the step of grinding and polishing treatment, the roughness Ra of the alumina ceramic layer is 0.2 μm, the thickness uniformity deviation of the alumina ceramic layer is ±5%, and the surface flatness deviation of the alumina ceramic layer is ±5 μm, to obtain a cooling ceramic roller.

[0080] Comparative Example 1

[0081] The comparative example of the present application provides a method for preparing a cooling ceramic roller, comprising the following steps:

[0082] A metal roller blank with a diameter of 250 mm is provided, wherein the interior of the metal roller blank has a channel for conveying a coolant, and a bonding layer of a nickel-based alloy material and an alumina ceramic layer are sequentially formed on the surface of the metal roller blank by a plasma spray deposition technology, so as to obtain a ceramic roller intermediate having an alumina ceramic layer with a thickness of 150 μm; the surface of the alumina ceramic layer of the ceramic roller intermediate is sequentially subjected to an organic sealing treatment and a grinding and polishing treatment, wherein in the step of grinding and polishing treatment, the roughness Ra of the alumina ceramic layer is 0.2 μm, the thickness uniformity deviation of the alumina ceramic layer is ±5%, and the surface flatness deviation of the alumina ceramic layer is ±5 μm, so as to obtain a cooling ceramic roller.

[0083] Test example

[0084] Electrostatic adsorption force test

[0085] Test method:

[0086] A 4.5 μm thick polyethylene terephthalate (PET) was used as a base film, and then a 1 μm thick conductive metal layer was coated on the base film as a composite current collector; then the cooling ceramic rollers prepared in Example 1 and Comparative Example 1 were respectively used as test objects, and one side of the conductive metal layer was attached to the ceramic layer of the cooling ceramic roller, and a bias voltage of 250 V was applied between the metal roller blank and the conductive metal layer of the ceramic roller so that the film material was tightly adsorbed on the ceramic roller, and then the film material was pulled from the tangential direction of the ceramic roller with a force increasing from small to large until the film material slid relative to the ceramic layer, and the pulling force during sliding was recorded, which was the magnitude of the electrostatic adsorption force, and the results were recorded in Table 1.

[0087] Table 1

[0088] sample Electrostatic adsorption force (N) Example 1 85 Comparative Example 1 30

[0089] Referring to Table 1, it can be seen from the test results of Example 1 and Comparative Example 1 that according to the preparation process provided in the embodiment of the present application, that is, the ceramic layer on the cooling ceramic roller is prepared by anodizing, compared with the ceramic layer on the cooling ceramic roller prepared by conventional plasma spraying process, since the thickness of the ceramic layer in the former is smaller, under the same voltage, the ceramic layer and the film material can fit more tightly and fully after the former is powered on, and the ceramic layer of the former is denser, and heat transfer can be carried out more quickly and effectively, thereby providing a better cooling effect for the film material, so as to improve the yield and production capacity of the corresponding product.

[0090] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a cooling ceramic roller, characterized in that: The following steps are involved: Providing a metal roller blank, wherein the metal roller blank has a channel for conveying a cooling liquid inside, and the surface of the metal roller blank has a metal layer made of Al and / or Al alloy; Using the metal roller embryo as an anode, forming an aluminum oxide ceramic layer with a thickness of ≤100 μm on the surface of the metal layer by anodizing to obtain a ceramic roller intermediate; The surface of the alumina ceramic layer of the ceramic roller intermediate is subjected to organic sealing treatment and grinding and polishing treatment in sequence to obtain the cooling ceramic roller.

2. The method for preparing a cooling ceramic roller according to claim 1, characterized in that: The thickness of the alumina ceramic layer is 30-70 μm.

3. The method for preparing a cooling ceramic roller according to claim 2, characterized in that: In the step of forming an aluminum oxide ceramic layer on the surface of the metal layer by anodizing, the treatment temperature is 22 to 24° C., the treatment time is 25 to 35 minutes, and the current density is 0.5 to 2 A / mm 2 , the molar concentration of hydrogen ions in the electrolyte is 3~4.1mol / L.

4. The method for preparing a cooling ceramic roller according to any one of claims 1 to 3, characterized in that: In the step of grinding and polishing, at least one of the following conditions A to C is met: A until the roughness of the alumina ceramic layer Ra≤0.2μm; B until the thickness uniformity deviation of the alumina ceramic layer is less than ±15%; C until the surface flatness deviation of the alumina ceramic layer is less than ±20 μm.

5. A cooling ceramic roller, characterized in that: The cooling ceramic roller is prepared by the preparation method of any one of claims 1 to 4.

6. A coating system, characterized in that: It comprises the cooling ceramic roller as claimed in claim 5.

7. The coating system according to claim 6, characterized in that: It includes a coating source, a plurality of cooling ceramic rollers and a plurality of passing rollers, each of the cooling ceramic rollers has a diameter of 100 to 300 mm, the plurality of cooling ceramic rollers are located above the coating source and are spaced apart in sequence, the plurality of cooling ceramic rollers extend from one side of the coating area of ​​the coating source to the other opposite side to cover the entire coating area, a passing roller is arranged between two adjacent cooling ceramic rollers, and the passing roller is located on the side of the cooling ceramic roller away from the coating source.

8. The coating system according to claim 7, characterized in that: The coating system is a roll-to-roll evaporation coating system, the coating source is one, and the distances from the geometric centers of the plurality of cooling ceramic rollers to the geometric center of the coating source are all 50 to 150 cm.

9. The coating system according to claim 8, characterized in that: The distances from the geometric centers of the plurality of cooling ceramic rollers to the geometric center of the coating source are all equal.

10. The coating system according to claim 7, characterized in that: The coating system is a magnetron sputtering coating system, the coating sources are multiple, and the multiple cooling ceramic rollers are all located above the multiple coating sources and are distributed in sequence at intervals in the horizontal direction.

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