Housing, its preparation method, and electronic equipment

Abstract

This application provides a housing comprising a polymer-ceramic layer, which includes a ceramic composite structure and a polymer. The ceramic composite structure comprises ceramic particles and a coating layer disposed on the surface of the ceramic particles. The coating layer is made of a layered material. In this housing, the ceramic composite structure is a core-shell structure. The coating layer in the ceramic composite structure is made of a layered material. The interlayer forces within the layered material are weak, allowing for relative sliding and thus a lubricating effect. This improves the fluidity of the ceramic composite structure in the polymer, helps to increase the solid content of the housing, enhances the mechanical properties and ceramic texture of the housing, and is beneficial for the application of the housing. This application also provides a method for preparing the housing and an electronic device.

Description

Technical Field

[0001] This application belongs to the field of electronic product technology, specifically relating to housings and their manufacturing methods, and electronic devices. Background Technology

[0002] With rising living standards, consumers are not only demanding diverse functions from electronic products, but also increasingly higher requirements for their appearance and texture. In recent years, ceramic materials, with their warm and smooth texture, have become a research hotspot for electronic device casings. Related technologies utilize composite materials formed from resin and ceramic materials to prepare products; however, these products differ significantly from genuine ceramic products in terms of hardness, gloss, and warm feel, making it difficult to achieve a truly authentic ceramic texture. Therefore, ceramic casings and their preparation methods still require improvement. Summary of the Invention

[0003] In view of this, this application provides a housing, a method for manufacturing the same, and an electronic device.

[0004] In a first aspect, this application provides a housing comprising a polymer ceramic layer, the polymer ceramic layer comprising a ceramic composite structure and a polymer, the ceramic composite structure comprising ceramic particles and a coating layer disposed on the surface of the ceramic particles, the coating layer being made of a layered material.

[0005] Secondly, this application provides a method for preparing a shell, comprising:

[0006] A coating layer is formed on the surface of ceramic particles to obtain a ceramic composite structure, wherein the coating layer is made of layered materials.

[0007] The ceramic composite structure is blended with the polymer, then mixed and granulated to form an injection molding feedstock.

[0008] The injection-molded feedstock is used to obtain a polymer ceramic sheet, which is then pressed to form a polymer ceramic layer, thus creating a shell.

[0009] Thirdly, this application provides an electronic device including the housing described in the first aspect.

[0010] This application provides a housing in which the ceramic composite structure is a core-shell structure. The coating layer in the ceramic composite structure is made of layered materials. The interlayer forces within the layered materials are weak, which can generate relative sliding and thus produce a lubrication effect, improving the fluidity of the ceramic composite structure in the polymer. This helps to increase the solid content of the housing, enhance the mechanical properties and ceramic texture of the housing, and is beneficial to the application of the housing. The preparation method of this housing is simple, easy to operate, and can be industrialized. Electronic devices with this housing have excellent performance, strong product competitiveness, and can better meet user needs. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0012] Figure 1 This is a schematic diagram of the structure of the housing provided in one embodiment of this application.

[0013] Figure 2 This is a schematic diagram of a ceramic composite structure provided in one embodiment of this application.

[0014] Figure 3 This is a schematic diagram of the structure of graphite.

[0015] Figure 4 A schematic diagram of the housing provided for another embodiment of this application.

[0016] Figure 5 A flowchart illustrating the method for preparing the shell according to one embodiment of this application.

[0017] Figure 6 This is a schematic diagram of the interior of a ceramic composite structure blended with a polymer according to one embodiment of this application.

[0018] Figure 7 This is a schematic diagram of the interior of ceramic particles blended with polymer, provided for an embodiment prior to the improvements in this application.

[0019] Figure 8 A flowchart illustrating a method for preparing a shell according to another embodiment of this application.

[0020] Figure 9 A flowchart illustrating a method for preparing a shell according to another embodiment of this application.

[0021] Figure 10 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application.

[0022] Figure 11 This is a schematic diagram of the structural composition of an electronic device provided in one embodiment of this application. Detailed Implementation

[0023] The following are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] Please see Figure 1 This is a schematic diagram of the structure of the shell provided in one embodiment of this application. The shell 100 includes a polymer ceramic layer 10, which includes a ceramic composite structure 11 and a polymer. The ceramic composite structure 11 includes ceramic particles 111 and a coating layer 112 disposed on the surface of the ceramic particles 111. The material of the coating layer 112 includes a layered material.

[0026] In this application, the ceramic composite structure 11 is a core-shell structure, and its coating layer 112 is made of layered material with a layered crystal structure. The interlayer forces within the layered material are weak, enabling relative sliding and thus producing a lubricating effect. This reduces the viscosity between the ceramic composite structure 11 and the polymer, which is beneficial for increasing the solid content of the shell 100 and enhancing its mechanical properties and ceramic texture. Compared to plastic shells, the shell 100 provided in this application contains ceramic particles 111, thereby improving the hardness, wear resistance, and gloss of the shell 100, and providing a high-end ceramic texture, enhancing product competitiveness. Simultaneously, the ceramic composite structure 11 in the shell 100 of this application has lubricating properties, allowing for better mixing with the polymer and improving the performance of the shell 100. Compared to ceramic shells, the shell 100 provided in this application contains polymer, improving the toughness and dielectric properties of the shell 100 while reducing its weight, meeting the requirements for thinner and lighter designs.

[0027] Please see Figure 2 This is a schematic diagram of a ceramic composite structure provided in one embodiment of this application. The ceramic composite structure 11 includes ceramic particles 111 and a coating layer 112 disposed on the surface of the ceramic particles 111. By providing a core-shell structure in the ceramic composite structure 11, the viscosity of the ceramic particles 111 in the polymer is reduced, the fluidity of the ceramic particles 111 in the polymer is improved, and the toughness, hardness and gloss of the shell 100 are enhanced.

[0028] In this embodiment, the ceramic particles 111 include at least one selected from Al2O3, ZrO2, Si3N4, SiO2, TiO2, AlN, SiC, and Si. The aforementioned ceramic powders exhibit high temperature resistance, high hardness, and good strength, which are beneficial for improving the performance of the shell 100. It is understood that the ceramic particles 111 may also be selected from other materials not listed above suitable for preparing the shell 100.

[0029] In this embodiment, the ceramic particles 111 have a particle size of 0.5 μm-2 μm. Ceramic particles 111 with the above-mentioned particle size are beneficial for improving the fine texture, strength, and hardness of the shell 100. Further, the particle size D50 of the ceramic particles 111 is 0.8 μm-1.8 μm. Even further, the particle size D50 of the ceramic particles 111 is 1 μm-1.5 μm. Specifically, the particle size of the ceramic particles 111 can be, but is not limited to, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, or 2 μm, etc.

[0030] In this application, the coating layer 112 is made of a layered material with a layered crystal structure. The interlayer forces within the layered material are weak, allowing the coating layer 112 to produce a lubricating effect, improving fluidity, and reducing the viscosity between the ceramic composite structure 11 and the polymer. This facilitates increasing the content of the ceramic composite structure 11, thereby increasing the solid content of the shell 100 and improving its performance. In one embodiment of this application, the layered material includes a two-dimensional material. In another embodiment, the layered material includes at least one of graphite and graphite oxide. In yet another embodiment, the layered material includes at least one of a two-dimensional material, graphite, and graphite oxide. The interlayer forces within the aforementioned layered materials are van der Waals forces, which are weak, further improving the lubrication effect of the coating layer 112 and the fluidity of the ceramic composite structure 11, thereby contributing to increasing the solid content of the shell 100 and its performance. Please refer to [link to relevant documentation]. Figure 3The diagram illustrates the structure of graphite, which has a layered structure. Adjacent layers are bounded by van der Waals forces, as shown by the vertical dashed lines. The relatively weak van der Waals forces facilitate relative sliding between layers, as shown by the horizontal lines, thus giving graphite a lubricating effect. In one embodiment of this application, the two-dimensional material includes at least one of graphene, graphene oxide, transition metal group compounds, and black phosphorus. Specifically, the transition metal group compounds may be, but are not limited to, at least one of molybdenum disulfide, tungsten disulfide, zirconium disulfide, titanium disulfide, molybdenum diselenide, tungsten diselenide, zirconium diselenide, and titanium diselenide. In another embodiment of this application, the two-dimensional material has at least two layers, thereby enabling interlayer forces and improving the lubrication effect of the coating layer 112. In a specific embodiment, the coating layer 112 includes at least one of a graphite layer, a graphene oxide layer, and a two-dimensional material layer.

[0031] In this embodiment, the thickness of the coating layer 112 is 20nm-150nm. Further, the thickness of the coating layer 112 is 40nm-130nm. Even further, the thickness of the coating layer 112 is 50nm-110nm. Specifically, the thickness of the coating layer 112 can be, but is not limited to, 30nm, 60nm, 80nm, 100nm, 120nm, 140nm, or 150nm. In this application, the coating layer 112 is relatively thin, which can increase the solid content in the shell 100 without excessively increasing the weight of the shell 100, and also ensures the content of ceramic particles 111 in the shell 100, thus ensuring the performance of the shell 100.

[0032] In this embodiment, the coating layer 112 has a coating rate of 70% or higher on the surface of the ceramic particles 111. Further, the coating layer 112 has a coating rate of 80% or higher on the surface of the ceramic particles 111. Specifically, the coating rate of the coating layer 112 on the surface of the ceramic particles 111 can be, but is not limited to, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. Having the above-mentioned coating rate can improve the fluidity of the ceramic composite structure 11 in the polymer during the preparation of the shell 100, which is beneficial for increasing the solid content of the shell 100, thereby improving the performance of the shell 100.

[0033] In this embodiment, the mass ratio of ceramic particles 111 to coating layer 112 in the ceramic composite structure 11 is 2.5-20. Further, the mass ratio of ceramic particles 111 to coating layer 112 in the ceramic composite structure 11 is 4-18. Even further, the mass ratio of ceramic particles 111 to coating layer 112 in the ceramic composite structure 11 is 8-15. Specifically, the mass ratio of ceramic particles 111 to coating layer 112 in the ceramic composite structure 11 can be, but is not limited to, 3, 5, 5.5, 6, 7, 9, 10, 11, 11.5, 12, 13, 14, 15, 16, 17, 18, 19, or 20. Within this range, it is beneficial to improve the flowability of the ceramic composite structure 11 in the polymer during the preparation of the shell 100, ensuring the solid content of the shell 100, while also ensuring the mass of the ceramic particles 111 in the shell 100, thereby ensuring the ceramic texture and mechanical properties of the shell 100. In this embodiment of the application, the ceramic particles 111 in the ceramic composite structure 11 account for 70%-95% of the mass, and the coating layer 112 accounts for 5%-30% of the mass. Further, the ceramic particles 111 in the ceramic composite structure 11 account for 75%-92% of the mass, and the coating layer 112 accounts for 8%-25% of the mass. Even further, the ceramic particles 111 in the ceramic composite structure 11 account for 85%-90% of the mass, and the coating layer 112 accounts for 10%-15% of the mass. Specifically, the mass percentage of ceramic particles 111 in the ceramic composite structure 11 can be, but is not limited to, 72%, 76%, 80%, 83%, 85%, 88%, 90%, 93%, or 94%, etc.

[0034] In this embodiment, the mass percentage of the ceramic composite structure 11 in the polymer ceramic layer 10 is 50%-95%. Further, the mass percentage of the ceramic composite structure 11 in the polymer ceramic layer 10 is 55%-90%. Even further, the mass percentage of the ceramic composite structure 11 in the polymer ceramic layer 10 is 70%-85%. Specifically, the mass percentage of the ceramic composite structure 11 in the polymer ceramic layer 10 can be, but is not limited to, 58%, 62%, 67%, 70%, 73%, 75%, 84%, 86%, or 91%. The lubricating properties of the coating layer 112 help increase the solid content in the housing 100 and improve the mechanical properties of the housing 100.

[0035] In this application, the polymer in the polymer ceramic layer 10 is cross-linked into a three-dimensional network structure, enhancing the internal bonding strength and toughness of the shell 100. In this embodiment, the polymer includes at least one of polyphenylene sulfide, polycarbonate, polyamide, polybutylene terephthalate, and polymethyl methacrylate. The physicochemical properties of the above polymers can match the manufacturing process of the shell 100, will not decompose during the manufacturing process, and will not increase the difficulty of the manufacturing process, thus helping to reduce production costs. It is understood that the polymer material can also be selected from other materials not listed above suitable for manufacturing the shell 100. In this embodiment, the polymer mass percentage in the polymer ceramic layer 10 is 5%-50%. Further, the polymer mass percentage in the polymer ceramic layer 10 is 10%-40%. Even further, the polymer mass percentage in the polymer ceramic layer 10 is 15%-35%. Specifically, the polymer mass percentage in the polymer ceramic layer 10 can be, but is not limited to, 7%, 10%, 15%, 20%, 25%, 35%, 40%, 45%, or 50%, etc. Using the polymer with the above content can improve the toughness of the shell 100 and reduce the weight of the shell 100, without affecting the ceramic texture of the shell 100.

[0036] In this embodiment, the polymer ceramic layer 10 may also contain a colorant, thereby giving the housing 100 different color appearances and improving visual effects. Specifically, the colorant may be, but is not limited to, at least one selected from iron oxide, cobalt oxide, cerium oxide, nickel oxide, bismuth oxide, zinc oxide, manganese oxide, chromium oxide, copper oxide, vanadium oxide, and tin oxide. In one embodiment, the mass content of the colorant in the polymer ceramic layer 10 is less than or equal to 10%, thereby improving the color of the polymer ceramic layer 10 without affecting the content of the ceramic composite structure 11 and the polymer. Further, the mass content of the colorant in the polymer ceramic layer 10 is 0.5%-10%.

[0037] This application uses a gloss meter to test the gloss of the polymer ceramic layer 10 surface according to GB / T 8807-1988 standard, wherein the angle of the gloss meter is 60°. In the embodiments of this application, the gloss of the polymer ceramic layer 10 surface is greater than or equal to 120. Further, the gloss of the polymer ceramic layer 10 surface is 120-140. Specifically, the gloss of the polymer ceramic layer 10 surface can be, but is not limited to, 125, 128, 130, 133, 135, 137, or 140, etc.

[0038] This application uses the GB / T 6739-1996 standard to test the hardness of the surface of the polymer ceramic layer 10. In this embodiment, the pencil hardness of the surface of the polymer ceramic layer 10 is greater than or equal to 2H. Further, the pencil hardness of the surface of the polymer ceramic layer 10 is 2H-5H, thereby significantly improving the hardness of the shell 100 and enhancing its strength. Even further, the pencil hardness of the surface of the polymer ceramic layer 10 is 2H-4H. Specifically, the pencil hardness of the surface of the polymer ceramic layer 10 can be, but is not limited to, 2H, 3H, 4H, or 5H.

[0039] In this application, a falling ball impact test is used to detect the performance of the polymer ceramic layer 10. The falling ball is a 32g stainless steel ball, and the polymer ceramic layer 10 has a thickness of 0.8mm. In one embodiment, the polymer ceramic layer 10 is supported on a fixture, with 3mm support around its edges and the center suspended. A 32g stainless steel ball is dropped freely from a certain height onto a test point on the surface of the polymer ceramic layer 10, and the height at which the polymer ceramic layer 10 breaks is recorded as the falling ball height. Further, a 32g stainless steel ball is dropped freely from a certain height onto five test points on the surface of the polymer ceramic layer 10, including the four corners and the center, and the height at which the polymer ceramic layer 10 breaks is recorded as the falling ball height. In this embodiment, the falling ball height of the polymer ceramic layer 10 is greater than or equal to 40cm. Further, the falling ball height of the polymer ceramic layer 10 is 40cm-100cm. Even further, the falling ball height of the polymer ceramic layer 10 is 60cm-75cm.

[0040] Please see Figure 4This is a schematic diagram of the structure of the housing provided in another embodiment of this application. The housing 100 may further include a protective layer 20, which is disposed on the surface of the polymer ceramic layer 10. During use, the housing 100 has an inner surface and an outer surface that are disposed opposite each other. The protective layer 20 is located on the outer surface side, thereby providing protection for the housing 100 during use. Specifically, the protective layer 20 may be, but is not limited to, an anti-fingerprint layer, a hardening layer, etc. Specifically, the thickness of the protective layer 20 may be, but is not limited to, 5nm-20nm. In one embodiment, the protective layer 20 includes an anti-fingerprint layer. Optionally, the contact angle of the anti-fingerprint layer is greater than 105°. The contact angle is an important parameter for measuring the wettability of a liquid on a material surface. An anti-fingerprint layer with a contact angle greater than 105° indicates that the liquid can easily move on the anti-fingerprint layer, thereby avoiding contamination of its surface and exhibiting excellent anti-fingerprint performance. Optionally, the anti-fingerprint layer includes a fluorinated compound. Specifically, the fluorinated compound may be, but is not limited to, fluorosilicone resin, perfluoropolyether, fluorinated acrylate, etc. Furthermore, the anti-fingerprint layer also includes silica, which further enhances the abrasion resistance of the anti-fingerprint layer. In another embodiment, the protective layer 20 includes a hardening layer. The surface hardness of the housing 100 is further enhanced by providing the hardening layer. Furthermore, the material of the hardening layer includes at least one of polyurethane acrylate, silicone resin, and perfluoropolyether acrylate.

[0041] In this application, the thickness of the housing 100 can be selected according to the needs of its application scenario, and is not limited thereto. In one embodiment, the housing 100 can serve as the outer shell, mid-frame, or decorative part of an electronic device, such as the housing of a mobile phone, tablet computer, laptop computer, watch, MP3 player, MP4 player, GPS navigator, or digital camera. The housing 100 in the embodiments of this application can be a 2D structure, a 2.5D structure, a 3D structure, etc., and can be selected as needed. In one embodiment, when the housing 100 is used as a back cover of a mobile phone, the thickness of the housing 100 is 0.6mm-1.2mm. Specifically, the thickness of the housing 100 can be, but is not limited to, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, or 1.2mm. In another embodiment, when the housing 100 is used as a back cover of a mobile phone, the housing 100 includes a main body and an extension portion disposed at the edge of the main body, the extension portion being bent toward the main body; in this case, the housing 100 is curved.

[0042] This application uses the GB / T 25995-2010 standard to test the porosity of the shell 100. In this embodiment, the porosity of the shell 100 is less than 1%, meaning the density of the shell 100 is greater than or equal to 99%. The low porosity of the shell 100 ensures the internal bonding strength of the shell 100, which is beneficial to improving the mechanical properties of the shell 100. Furthermore, the porosity of the shell 100 is less than 0.5%, further improving the density of the shell 100.

[0043] In this embodiment, the surface roughness of the housing 100 is less than 0.1 μm. By providing a housing 100 with low surface roughness, it is beneficial to enhance its ceramic texture, improve its appearance, and further facilitate the use of the housing 100. Further, the surface roughness of the housing 100 is 0.02 μm-0.08 μm.

[0044] Please see Figure 5 This is a flowchart of a method for preparing a shell according to an embodiment of this application. This method is used to prepare the shell 100 in any of the above embodiments and includes:

[0045] S101: A coating layer is formed on the surface of ceramic particles to obtain a ceramic composite structure. The material of the coating layer includes layered materials.

[0046] S102: Ceramic composite structure is blended with polymer, mixed and granulated to form injection molding feedstock.

[0047] S103: The injection feedstock is injection molded to obtain a polymer ceramic sheet, and the polymer ceramic sheet is pressed to obtain a polymer ceramic layer, thus forming a shell.

[0048] The method for preparing the shell 100 provided in this application is simple to operate, easy to mass-produce, and can produce a shell 100 with excellent performance, which is beneficial to its application.

[0049] In S101, by forming a coating layer 112 on the surface of the ceramic particles 111, it helps to reduce the viscosity after mixing with the polymer, and at the same time can increase the solid content of the mixture formed by mixing with the polymer.

[0050] In S102, the ceramic composite structure 11 is blended with the polymer, then mixed and granulated to form an injection feedstock, which facilitates subsequent injection molding. In related technologies, when ceramic particles 111 are mixed with polymers, the resulting mixture has high viscosity and low fluidity, which can easily increase resistance during injection molding and even make flow marks on the polymer-ceramic sheets obvious, reducing the mechanical properties of the shell 100. In this application, the ceramic composite structure 11 is blended with the polymer. The self-lubricating effect of the ceramic composite structure 11 helps to increase the solid content in the resulting mixture, and can also reduce the viscosity of the resulting mixture, improve fluidity, facilitate injection molding, improve injection molding quality, and thus improve the mechanical properties of the shell 100.

[0051] It is understood that when the ceramic composite structure 11 and the polymer are blended, the mixing ratio of the ceramic composite structure 11 and the polymer can be selected according to the content of each substance in the polymer ceramic layer 10, and is not limited thereto. In one embodiment, the mass ratio of the ceramic composite structure 11 to the polymer is 1-20, which is beneficial for obtaining a polymer ceramic layer 10 with high hardness, good toughness, high gloss, and strong ceramic texture. In the embodiments of this application, blending includes dry or wet grinding, such as using a ball mill or a sand mill. In one embodiment, dry blending is beneficial for improving blending efficiency. In a specific embodiment, the ceramic composite structure 11, the polymer, and the grinding balls are placed together in a dry ball mill for grinding for 2-10 hours. In this application, internal mixing and granulation are beneficial for the injection molding process. For example, the blended mixture can be placed in an integrated internal mixing and granulation machine for internal mixing and granulation. In one embodiment, the temperature of internal mixing and granulation is higher than the melting point of the selected polymer and lower than the decomposition temperature of the selected polymer. Specifically, the mixing and granulation temperature can be, but is not limited to, 200℃-350℃, and the mixing and granulation time can be, but is not limited to, 1h-12h. Furthermore, the mixing process is carried out under negative pressure, with an absolute pressure value of less than 0.01MPa, thereby effectively preventing the selected polymer from being oxidized and effectively promoting the removal of gases generated by side reactions.

[0052] Please see Figure 6 This is a schematic diagram of the internal structure of the ceramic composite structure after blending with a polymer according to one embodiment of this application; please refer to... Figure 7 This is a schematic diagram of the internal structure of ceramic particles blended with a polymer, provided in the embodiment prior to the improvement of this application. Figure 6 and Figure 7It can be seen that the friction between ceramic particles 111 and polymer is large, resulting in high viscosity and low fluidity of the blended solution. However, due to the coating layer 112 in the ceramic composite structure 11, the friction between the ceramic composite structure 11 and polymer is reduced, which lowers the viscosity of the blended solution and improves its fluidity. This is more conducive to injection molding and helps to improve the gloss and mechanical properties of the shell 100.

[0053] This application tests the melt flow index of the injection molding feedstock according to GB / T 3682-2000 standard. In the embodiments of this application, the melt flow index of the injection molding feedstock is greater than or equal to 10 g / 10 min. Further, the melt flow index of the injection molding feedstock is 10 g / 10 min to 25 g / 10 min. Even further, the melt flow index of the injection molding feedstock is 12 g / 10 min to 20 g / 10 min. The injection molding feedstock provided by this application has a high melt flow index and excellent flowability, which is beneficial to improving injection molding quality.

[0054] In S103, a polymer ceramic layer 10 is obtained by injection molding and pressing of the injection feed material, and a shell 100 is made.

[0055] In this application, the injection molding temperature can be selected based on the properties of the chosen polymer. For example, the injection molding temperature can be, but is not limited to, 200℃-350℃; or, when polyphenylene sulfide is selected, the injection molding temperature can be 290℃-330℃. The thickness of the polymer ceramic sheet obtained by injection molding can be selected as needed. Furthermore, the thickness of the polymer ceramic sheet will decrease during subsequent pressing and processing; therefore, the thickness of the polymer ceramic sheet can be increased during injection molding. In this application, the injection molding method is simpler to operate. Compared with casting molding, there is no need to consider the compatibility between the solvent and the polymer, resulting in lower preparation costs. It also improves the contact between the ceramic composite structure 11 and the polymer, enhancing their adhesion. Additionally, the polymer ceramic sheet mentioned in this application has a smooth surface without obvious scratches, ensuring the performance of the shell 100. It is understood that other molding methods, such as casting molding, can also be used to prepare polymer ceramic sheets.

[0056] In this embodiment, the pressing of polymer ceramic sheets includes performing warm isostatic pressing (WIP). WIP reduces the porosity of the polymer ceramic sheets and improves internal bonding strength. Isostatic pressing is a technique that uses a sealed high-pressure container to form a product under uniform ultra-high pressure. Isostatic pressing is classified into three types based on the temperature during forming and consolidation: cold isostatic pressing, warm isostatic pressing, and hot isostatic pressing. In this application, the temperature of warm isostatic pressing is higher than the glass transition temperature of the polymer, allowing the polymer in the polymer ceramic sheet to soften and achieving better compaction under pressure, thereby eliminating pores within the polymer ceramic sheet and improving the bonding strength between the ceramic composite structure 11 and the polymer. In one embodiment, the pressure of warm isostatic pressing is 50 MPa-500 MPa, which is beneficial for fully compacting the polymer ceramic sheet. Furthermore, this process has low equipment requirements, good safety, and is more conducive to practical operation and application. Further, the pressure of warm isostatic pressing is 100 MPa-400 MPa. In this application, the warm isostatic pressing (WIP) time can be selected based on the thickness of the polymer ceramic sheet. In one embodiment, the WIP temperature is 80℃-300℃, the WIP time is 0.5h-2h, and the WIP pressure is 50MPa-500MPa, which can further reduce the porosity of the polymer ceramic sheet and improve the internal bonding force. In a specific embodiment, the polymer ceramic sheet can be placed in a casing, and the gas adsorbed on the surface of the green body, in the internal voids, and inside the casing can be removed. After vacuum sealing, it can be placed in a pressure vessel with a heating furnace for WIP.

[0057] Please see Figure 8 The above is a flowchart of a method for preparing a housing according to another embodiment of this application. This method prepares the housing 100 of any of the above embodiments, including:

[0058] S201: The coating layer is formed on the surface of ceramic particles by at least one of solid-phase coating method and liquid-phase coating method to obtain a ceramic composite structure, wherein the material of the coating layer includes layered materials.

[0059] S202: Ceramic composite structure is blended with polymer, mixed and granulated to form injection molding feedstock.

[0060] S203: The injection feedstock is injection molded to obtain a polymer ceramic sheet, and the polymer ceramic sheet is pressed to obtain a polymer ceramic layer, thus forming a shell.

[0061] It is understood that for a detailed description of S202 and S203, please refer to the description of the corresponding parts of S102 and S103 in the above embodiments, and will not be repeated here.

[0062] In S201, the coating layer 112 is formed on the surface of ceramic particles 111 by at least one of solid-phase coating method and liquid-phase coating method to obtain ceramic composite structure 11, thereby preparing ceramic composite structure 11 with lubricating properties.

[0063] In one embodiment of this application, a ceramic composite structure 11 is prepared using a solid-phase coating method. In one embodiment, the ceramic composite structure 11 is obtained by mixing ceramic particles 111 with a coating layer 112 material and then mechanically grinding the mixture. In a specific embodiment, graphene oxide is dispersed in water, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide are added to activate the carboxyl groups; subsequently, ceramic particles 111 with amino groups grafted onto their surfaces are added, and after stirring, filtration, and drying, the ceramic composite structure 11 is obtained, wherein the ceramic composite structure 11 includes ceramic particles 111 and a graphene oxide layer coating the surface of the ceramic particles 111.

[0064] In another embodiment of this application, a ceramic composite structure 11 is prepared using a liquid-phase coating method. Specifically, but not limited to, a hydrothermal method can be used to prepare the ceramic composite structure 11. In one embodiment, ceramic particles 111 are dispersed in a precursor solution, followed by a hydrothermal reaction to obtain the ceramic composite structure 11. It is understood that in the hydrothermal method, the precursor solution undergoes a hydrothermal reaction to form a coating layer 112 on the surface of the ceramic particles 111. The specific material of the precursor solution can be selected based on the material of the coating layer 112, and is not limited thereto. Optionally, the concentration of the precursor solution is 50 mg / ml-200 mg / ml. Further, the concentration of the precursor solution is 80 mg / ml-170 mg / ml. Further, the concentration of the precursor solution is 100 mg / ml-150 mg / ml. Specifically, the concentration of the precursor solution can be, but is not limited to, 50 mg / ml, 60 mg / ml, 75 mg / ml, 90 mg / ml, 100 mg / ml, 105 mg / ml, 120 mg / ml, 125 mg / ml, or 140 mg / ml. Using precursor solutions of these concentrations ensures the hydrothermal reaction proceeds smoothly, avoiding excessively slow reactions, while also preventing agglomeration and facilitating the formation of a uniformly covering coating layer 112. In this application, the liquid-phase coating process can be, but is not limited to, carried out in a reaction vessel. In one specific embodiment, ceramic particles 111 are dispersed in a graphite precursor solution, and then heated and annealed to form a ceramic composite structure 11. Specifically, the solute in the graphite precursor solution includes at least one of glucose, fructose, sucrose, and polyvinylpyrrolidone. An amorphous carbon layer is formed on the surface of the ceramic particles 111 by heating, and then annealing transforms the carbon layer into a graphite layer. Optionally, the heating temperature is 140℃-200℃, and the heating time is 5h-20h; the annealing temperature is 700℃-1000℃, and the annealing time is 2h-5h. The above heating process ensures the hydrothermal reaction proceeds, increases the formation of reaction products, and simultaneously avoids agglomeration. The above annealing process can transform the amorphous carbon layer into a graphite layer, while also preventing agglomeration. Further, the heating temperature is 150℃-280℃, and the heating time is 8h-15h; the annealing temperature is 800℃-900℃, and the annealing time is 2.5h-4h. In this application, annealing is carried out in an inert atmosphere such as nitrogen or argon to prevent oxidation and burn-off of the carbon layer. Optionally, a drying treatment is included before annealing, with a drying temperature of 80℃-120℃ and a heating time of 2h-5h.

[0065] Please see Figure 9 This is a flowchart illustrating a method for preparing a shell according to another embodiment of this application. This method prepares the shell 100 of any of the above embodiments, including:

[0066] S301: A coating layer is formed on the surface of ceramic particles to obtain a ceramic composite structure. The material of the coating layer includes layered materials.

[0067] S302: Ceramic composite structure modified and blended with polymer, then mixed and granulated to form injection molding feedstock.

[0068] S303: The injection feedstock is injection molded to obtain a polymer ceramic sheet, and the polymer ceramic sheet is pressed to obtain a polymer ceramic layer, thus forming a shell.

[0069] It is understood that for a detailed description of S301 and S303, please refer to the description of the corresponding parts of S101 and S103 in the above embodiments, and will not be repeated here.

[0070] In S302, the ceramic composite structure 11 is modified before being blended with the polymer to further improve the compatibility and interfacial adhesion between the ceramic composite structure 11 and the polymer. In this embodiment, the modification of the ceramic composite structure 11 includes mixing the ceramic composite structure 11 with a surface modifier and then drying it. In this application, the surface modifier may include, but is not limited to, at least one of coupling agents, surfactants, organosilicones, dispersants, etc., and the surface modifier can be selected according to the properties of the polymer. In one embodiment, a coupling agent can be selected for modification. Specifically, the coupling agent may be, but is not limited to, silane coupling agents, titanate coupling agents, etc. In another embodiment, the surface modifier accounts for 0.5%-3% of the mass of the ceramic composite structure 11, thereby ensuring complete surface modification of the ceramic composite structure 11 and preventing agglomeration between surface modifiers. Further, the surface modifier accounts for 0.8%-2.5% of the mass of the ceramic composite structure 11. Specifically, the surface modifier accounts for 0.6%, 1%, 1.5%, 2%, 2.5%, or 3% of the mass of the ceramic composite structure 11. For example, the coupling agent accounts for 0.5%-3% of the mass of the ceramic composite structure 11. In one specific embodiment, the surface modifier is modified by mixing and grinding the ceramic composite structure 11, the surface modifier, and abrasive beads.

[0071] In one embodiment of this application, the method for preparing the housing 100 further includes performing computer-controlled precision machining (CNC machining) on ​​the housing 100. CNC machining yields the housing 100 with the final required assembly dimensions. For example, CNC machining makes the housing 100 more flat. In another embodiment of this application, the method for preparing the housing 100 further includes polishing the housing 100. By polishing and grinding the surface of the housing 100, the surface roughness of the housing 100 is reduced, thereby improving the ceramic texture and hardness of the housing 100 surface. In one embodiment, the surface roughness of the housing 100 is less than 0.1 μm. By providing a housing 100 with low surface roughness, it is beneficial to enhance its surface gloss and ceramic texture, improving the visual effect. Further, the surface roughness of the housing 100 is 0.02 μm-0.08 μm. In another embodiment, the surface hardness of the housing 100 is greater than or equal to 2H.

[0072] In one embodiment of this application, the method for preparing the housing 100 further includes spraying or vapor-depositing a protective material on the surface of the polymer ceramic layer 10 to form a protective layer 20. In one embodiment, an anti-fingerprint layer is formed by vapor-depositing an anti-fingerprint material on the surface of the polymer ceramic layer 10, thereby improving the anti-fingerprint effect of the housing 100.

[0073] This application also provides an electronic device 200, including the housing 100 in any of the above embodiments. It will be understood that the electronic device 200 may be, but is not limited to, a mobile phone, tablet computer, laptop computer, watch, MP3 player, MP4 player, GPS navigator, digital camera, etc. Please refer to... Figure 10 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application, wherein the electronic device 200 includes a housing 100. The housing 100 can improve the mechanical properties of the electronic device 200, and the electronic device 200 has a ceramic-like appearance, giving it excellent product competitiveness. Please refer to... Figure 11This is a schematic diagram of the structural composition of an electronic device provided in one embodiment of this application. The electronic device 200 may include an RF circuit 210, a memory 220, an input unit 230, a display unit 240, a sensor 250, an audio circuit 260, a WiFi module 270, a processor 280, and a power supply 290. The RF circuit 210, memory 220, input unit 230, display unit 240, sensor 250, audio circuit 260, and WiFi module 270 are all connected to the processor 280; the power supply 290 provides power to the entire electronic device 200. Specifically, the RF circuit 210 is used to receive and transmit signals; the memory 220 is used to store data instruction information; the input unit 230 is used to input information, and may include a touch panel and other input devices such as operation buttons; the display unit 240 may include a display screen; the sensor 250 includes an infrared sensor, a laser sensor, etc., for detecting user proximity signals, distance signals, etc.; the speaker 261 and the microphone 262 are connected to the processor 280 through the audio circuit 260 for receiving and transmitting sound signals; the WiFi module 270 is used to receive and transmit WiFi signals; and the processor 280 is used to process the data information of the electronic device 200.

[0074] The following specific embodiments and comparative examples further illustrate the preparation method of the shell provided in this application and the performance of the obtained shell; wherein, the alumina raw material in the shells of the embodiments and comparative examples of this application was purchased from Shanghai Baitu High-Tech Materials Technology Co., Ltd., with specification BAK-1; and the polyphenylene sulfide raw material was purchased from Zhejiang Xinhecheng Co., Ltd., with specification 3450.

[0075] Example 1

[0076] A shell includes a ceramic composite structure and polyphenylene sulfide (PPS), wherein the ceramic composite structure includes Al2O3 and a graphite layer coating Al2O3, the mass ratio of Al2O3 to graphite in the ceramic composite structure is 8:2, and the mass proportion of the ceramic composite structure in the shell is 70%.

[0077] Example 2

[0078] A shell includes a ceramic composite structure and PPS, wherein the ceramic composite structure includes Al2O3 and a graphite layer coating Al2O3, the mass ratio of Al2O3 to graphite in the ceramic composite structure is 8:2, and the mass proportion of the ceramic composite structure in the shell is 80%.

[0079] Example 3

[0080] A shell includes a ceramic composite structure and PPS, wherein the ceramic composite structure includes Al2O3 and a graphite layer coating Al2O3, the mass ratio of Al2O3 to graphite in the ceramic composite structure is 9.8:0.2, and the mass proportion of the ceramic composite structure in the shell is 70%.

[0081] Example 4

[0082] A shell includes a ceramic composite structure and PPS, wherein the ceramic composite structure includes Al2O3 and a molybdenum disulfide layer coating Al2O3, the mass ratio of Al2O3 to molybdenum disulfide in the ceramic composite structure is 8:2, and the mass proportion of the ceramic composite structure in the shell is 70%.

[0083] Example 5

[0084] A shell includes a ceramic composite structure and PPS, wherein the ceramic composite structure includes Al2O3 and a black phosphorus layer coating Al2O3, the mass ratio of Al2O3 to black phosphorus in the ceramic composite structure is 8:2, and the mass proportion of the ceramic composite structure in the shell is 70%.

[0085] Comparative Example 1

[0086] A shell comprising Al2O3 and PPS, wherein the mass percentage of Al2O3 in the shell is 70%.

[0087] Comparative Example 2

[0088] A shell comprising Al2O3 and PPS, wherein the mass percentage of Al2O3 in the shell is 80%.

[0089] Performance testing

[0090] The melt flow index of the injection molding feed formed by the ceramic composite structure and PPS during the preparation of the shell provided in the above embodiments was tested using GB / T 3682-2000 standard, and the melt flow index of the injection molding feed formed by the ceramic particles and PPS during the preparation of the shell provided in the above comparative example was also tested. The pencil hardness of the shell surface provided in the above embodiments and comparative examples was tested using GB / T 6739-1996 standard. The gloss of the shell surface provided in the above embodiments and comparative examples was tested using GB / T 8807-1988, with the gloss meter angle at 60°. The shells provided in the above embodiments and comparative examples were all 150mm×73mm×0.8mm in size. The shells were supported on a fixture (with 3mm support on each of the four sides and the middle suspended). A 32g stainless steel ball was dropped freely from a certain height onto the surface to be tested. Five points were measured at the four corners and the center of the shell, and each point was measured five times until the shell broke. The drop height of the ball was recorded, and the results are shown in Table 1.

[0091] Table 1 Performance Test Results

[0092]

[0093]

[0094] Compared to the shell provided in Comparative Example 1, the injection molding feedstock in Examples 1 and 3-5 of this application has a high melt index and strong fluidity during the preparation process, resulting in shells with better hardness, gloss, and improved drop height detection values. In other words, the shells obtained in these examples exhibit enhanced ceramic texture and toughness. Compared to Comparative Example 2, Example 2 of this application has a high melt index and strong fluidity during the preparation process. While Comparative Example 2 could not produce a complete shell due to its high solids content, Example 2 of this application was able to produce a normal, complete shell with excellent hardness, gloss, and toughness. Therefore, compared to the comparative examples, the shells provided in this application have superior mechanical properties and a better ceramic texture, which is beneficial for their application.

[0095] The foregoing has provided a detailed description of the embodiments of this application, and has elucidated and explained the principles and implementation methods of this application. However, the above description is only for the purpose of helping to understand the method and core ideas of this application; at the same time, for those skilled in the art, there will be changes in specific implementation methods and application scope based on the ideas of this application. In summary, the content of this specification should not be construed as a limitation of this application.

Claims

1. A housing characterized by, The shell comprises a polymer ceramic layer, the polymer ceramic layer comprises a ceramic composite structure and a polymer, the ceramic composite structure comprises ceramic particles and a coating layer arranged on the surface of the ceramic particles, the material of the coating layer comprises a layered material, the mass ratio of the ceramic particles to the coating layer in the ceramic composite structure is 2.5-20, the coating rate of the coating layer on the surface of the ceramic particles is greater than or equal to 70%, the particle size of the ceramic particles is 0.5-2 μm, the thickness of the coating layer is 20-150 nm, the mass percentage of the ceramic composite structure in the polymer ceramic layer is 50-95%, and the mass percentage of the polymer is 5-50%, and the layered material can improve the flowability of the ceramic composite structure in the polymer and improve the solid content of the shell.

2. The housing of claim 1, wherein The mass percentage of the ceramic particles in the ceramic composite structure is 70-95%, and the mass percentage of the coating layer is 5-30%.

3. The housing of claim 1, wherein The layered material comprises a two-dimensional material, the number of layers of the two-dimensional material is at least two, and the two-dimensional material comprises at least one of graphene, graphene oxide, a transition metal group compound, and black phosphorus.

4. The housing of claim 1, wherein The layered material comprises at least one of graphite and graphite oxide.

5. The housing of claim 1, wherein The ceramic particles comprise at least one of Al2O3, ZrO2, Si3N4, SiO2, TiO2, AlN, SiC, and Si, and the polymer comprises at least one of polyphenylene sulfide, polycarbonate, polyamide, polybutylene terephthalate, and polymethyl methacrylate.

6. The housing of claim 1, wherein The shell further comprises a protective layer arranged on the surface of the polymer ceramic layer.

7. A method of producing a case, characterized by, Comprise: forming a coating layer on the surface of the ceramic particles to obtain a ceramic composite structure, the material of the coating layer comprising a layered material; the ceramic composite structure is blended with a polymer, and is densified and granulated to form an injection molding feed, and the melt index of the injection molding feed is greater than or equal to 10 g / 10 min; the injection molding feed is injection molded to obtain a polymer ceramic sheet, the polymer ceramic sheet is pressed to obtain a polymer ceramic layer, and the shell of any one of claims 1-6 is prepared.

8. The production method according to claim 7, wherein The forming of the coating layer on the surface of the ceramic particles comprises: forming the coating layer on the surface of the ceramic particles by at least one of a solid-phase coating method and a liquid-phase coating method.

9. The production method according to claim 7, wherein Before the ceramic composite structure is blended with the polymer, it further comprises: mixing the ceramic composite structure with a surface modifier and drying, the mass percentage of the surface modifier in the mass of the ceramic composite structure is 0.5-3%.

10. The production method according to claim 7, wherein The pressing of the polymer ceramic sheet comprises: warm isostatic pressing the polymer ceramic sheet, the temperature of the warm isostatic pressing is 80-300°C, the temperature of the warm isostatic pressing is higher than the glass transition temperature of the polymer, the pressure of the warm isostatic pressing is 50-500 MPa, and the time of the warm isostatic pressing is 0.5-2 h.

11. An electronic device, comprising: The shell of any one of claims 1-6.

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