CN112297538A

CN112297538A - Ceramic-like shell, preparation method thereof and electronic equipment

Info

Publication number: CN112297538A
Application number: CN202011176300.7A
Authority: CN
Inventors: 潘旋
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-02-02
Anticipated expiration: 2040-10-28
Also published as: CN112297538B

Abstract

The application provides an imitative ceramic casing, including non-ceramic substrate, printing ink layer, liquid glass layer and the optics rete that stacks gradually the setting. The base color of the ceramic appearance is realized through the ink layer, the glaze texture of the ceramic appearance is realized through the optical film layer, the combination performance of the liquid glass layer, the ink layer and the optical film layer is excellent, the overall use performance is improved, and the ceramic shell can be widely applied to electronic equipment. Meanwhile, the preparation method of the imitation ceramic shell is simple, the production efficiency is high, the preparation yield is excellent, and the preparation cost is low. The ceramic-like shell can be widely applied to electronic equipment, so that the electronic equipment can achieve the appearance of ceramic texture, and the product competitiveness is improved.

Description

Ceramic-like shell, preparation method thereof and electronic equipment

Technical Field

The application belongs to the technical field of electronic products, and particularly relates to a ceramic-like shell, a preparation method thereof and electronic equipment.

Background

Ceramics are popular with consumers because of their moist texture like jade, and are also gradually applied to electronic devices in recent years. At present, when a ceramic material is directly adopted to prepare a product, the yield and the productivity are not high, and the use of ceramic parts in electronic equipment is limited.

Disclosure of Invention

In view of this, the application provides a ceramic-like shell with ceramic texture, and the ceramic-like shell has good ceramic appearance effect, simple preparation method, excellent production efficiency and yield, and is beneficial to wide application in electronic equipment.

In a first aspect, the application provides an imitative ceramic casing, including non-ceramic substrate, printing ink layer, liquid glass layer and the optics rete that stacks gradually the setting.

In a second aspect, the present application provides a method for preparing a ceramic-like shell, comprising:

and sequentially forming an ink layer, a liquid glass layer and an optical film layer on the non-ceramic substrate to obtain the ceramic-like shell.

In a third aspect, the present application provides an electronic device, including imitative ceramic casing and mainboard, imitative ceramic casing is including the non-ceramic substrate, printing ink layer, liquid glass layer and the optics rete that stack gradually the setting.

The application provides a ceramic-like shell, wherein an ink layer can realize the ground color of the appearance of ceramic, an optical film layer can realize the glaze texture of the appearance of ceramic, and the combination performance of a liquid glass layer, the ink layer and the optical film layer is excellent, so that the overall use performance is improved, and the ceramic-like shell is favorably and widely applied to electronic equipment; and the ceramic texture of the ceramic-like shell can be realized without using ceramic materials, and the application field of non-ceramic substrates is expanded. Meanwhile, the preparation method of the ceramic-like shell is simple, high in production efficiency, excellent in preparation yield and low in preparation cost. The ceramic-like shell can be widely applied to electronic equipment, so that the electronic equipment can realize the appearance with ceramic texture, and the product competitiveness is improved.

Drawings

In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural diagram of a ceramic shell according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a ceramic shell according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a ceramic shell according to an embodiment of the present disclosure.

Fig. 4 is a schematic flow chart of a method for manufacturing a ceramic shell according to an embodiment of the present disclosure.

Description of reference numerals:

10 parts of non-ceramic substrate, 101 parts of outer surface, 102 parts of inner surface, 20 parts of ink layer, 30 parts of liquid glass layer, 40 parts of optical film layer, 50 parts of functional layer and 100 parts of ceramic-like shell.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, a schematic structural diagram of a ceramic-like housing according to an embodiment of the present disclosure is shown, in which a ceramic-like housing 100 includes a non-ceramic substrate 10, an ink layer 20, a liquid glass layer 30, and an optical film layer 40, which are sequentially stacked. In the application, the ground color of the ceramic appearance is realized by arranging the ink layer 20, the enamel feeling of the ceramic appearance is realized by arranging the optical film layer 40, the ink layer 20 is close to the non-ceramic substrate 10 and serves as a priming layer, and the optical film layer 40 is far away from the non-ceramic substrate 10 and serves as a surface layer, so that the appearance effect of the ceramic glaze texture can be better realized; meanwhile, the liquid glass layer 30 has excellent bonding performance with the ink layer 20 and the optical film layer 40, so that the overall use performance is improved, and the ceramic-like shell 100 is favorably and widely applied to electronic equipment; moreover, the ceramic-like shell 100 can realize ceramic texture without using ceramic materials, and the application field of the non-ceramic substrate 10 is expanded.

In the related art, when only the ink layer 20 is used, the surface reflectivity of the ink layer 20 is low, the texture of plastic is presented, the texture of ceramic cannot be achieved, even if the optical film layer 40 is used for priming, the visual effect of the texture of ceramic glaze cannot be achieved, and rainbow patterns can be generated when the surface of the ink layer 20 is not smooth, which is more beneficial to the presentation of the texture of ceramic; only adopt optics rete 40 as the top layer, when printing ink layer 20 was as the bottom, the bonding performance between optics rete 40 and the printing ink layer 20 was not good, took place wearing and tearing easily and drops when using, influences product performance. This application is through adopting optics rete 40 as the surface, its reflectivity is close with ceramic reflectivity, can realize ceramic enamel feel, adopt printing ink layer 20 as the bottoming layer simultaneously, realize ceramic ground colour, liquid glass layer 30 has still been set up, promote overall structure's bonding property, and printing ink layer 20, liquid glass layer 30 and optics rete 40 range upon range of setting in proper order on non-ceramic substrate 10, can enough avoid the appearance of rainbow line, bonding property is excellent between each layer simultaneously, printing ink layer 20 is add on non-ceramic substrate 10 surface, behind liquid glass layer 30 and the optics rete 40, each layer synergism has realized imitative ceramic's outward appearance effect, promote the range of application.

In the application, the non-ceramic substrate 10 is adopted to match with other structures, so that the ceramic texture is realized, and the application range of the non-ceramic substrate 10 is improved. The material of the non-ceramic substrate 10 can be, but is not limited to, any material known to be used for electronic device housings. In the present embodiment, the material of the non-ceramic substrate 10 includes at least one of glass, metal, and plastic. The non-ceramic substrate 10 can realize the appearance of ceramic, and simultaneously keeps the performance of the original material, thereby being more beneficial to application. Specifically, the non-ceramic substrate 10 may have a single-layer structure, or may have a multi-layer structure, specifically, a single-layer plastic layer, a multi-layer plastic composite layer, a glass plate, or the like. In one embodiment, the material of the non-ceramic substrate 10 includes plastic, and the plastic includes at least one of polycarbonate, polymethyl methacrylate, polyethylene terephthalate, polyethylene, polypropylene, and thermoplastic polyurethane. Specifically, the non-ceramic substrate 10 may be, but is not limited to, a laminate of a polymethylmethacrylate layer and a polycarbonate layer. In another embodiment of the present application, the material of the non-ceramic substrate 10 includes glass. In particular, the non-ceramic substrate 10 may be, but is not limited to, a strengthened glass, which enhances the mechanical properties of the non-ceramic substrate 10. In another embodiment of the present application, the material of the non-ceramic substrate 10 includes a metal. In one embodiment, the non-ceramic substrate 10 is a metal shell having a gap filled with an electrically insulating material. Because the metal has a shielding effect on the signal, the communication effect is ensured by arranging an electrically insulated gap on the metal shell. Specifically, the electrically insulating material may be, but is not limited to, at least one of plastic and glass. In the present application, the thickness of the non-ceramic substrate 10 is not particularly limited. In the present embodiment, the non-ceramic substrate 10 has a thickness of 0.1mm to 1 mm. Specifically, the thickness of the non-ceramic substrate 10 may be, but not limited to, 0.2mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, etc. to meet the requirement of impact resistance, and the non-ceramic substrate is not too thick, and meets the requirement of light weight and thin weight. In another embodiment of the present application, the non-ceramic substrate 10 may be of a constant thickness, or a graded thickness, to achieve different appearance effects. In the present application, the specific shape and size of the non-ceramic substrate 10 are not limited, and can be selected and designed according to actual needs, for example, the non-ceramic substrate 10 is the shape of the back shell and/or the middle frame of an electronic device, such as a 2D shape, a 2.5D shape, a 3D shape, and the like.

In the present application, the ink layer 20 provides a ceramic-like ground color to the ceramic-like housing 100. The ink layer 20 is a color ink layer, and the color of the ink layer 20 can be, but is not limited to, white, blue, cyan, yellow, red, etc.; and the ceramic material can also be spliced or gradually changed in various colors to form a ceramic simulating effect of contrast color. In an embodiment, the ink layer 20 with the color impact is obtained by arranging the inks with different colors in different areas, for example, the ink layer 20 has a first area and a second area with a color difference larger than 4, so that the color impact effect is better realized, and the first area can be patterned to improve the appearance effect.

In the embodiment of the present disclosure, the ink layer 20 may be formed by coating ink, and then curing the ink layer 20, for example, by spraying or silk-screen printing color ink. Optionally, the curing comprises baking at 50-80 ℃ for 20-100 min. Further, the curing comprises baking at 60-75 ℃ for 30-80 min. In the present application, the ink includes an organic high molecular substance, a film-forming material, and a pigment; the hardness and reflectance of the ink layer 20 formed after curing are not high. In one embodiment of the present application, the hardness H of the ink layer 20₁Not more than 3H. Specifically, the hardness H of the ink layer 20₁But may not be limited to no greater than 1.5H, 1.8H, 2H, or 2.5H. In this application, the hardness is measured by GBT6739-1996 Pencil test method for film hardness, pencils of different hardness (0H-9H) are used for measurement under the same load (1kg), and the hardness of the film layer is indirectly judged according to the scratch degree of the surface of the film layer. In the related art, when the ink layer 20 is used as a surface layer, the hardness of the ink layer 20 is low, the wear resistance is poor, and the ink layer is easily scratched and falls off, which is not beneficial to application. The reflectivity of the ceramic product generally reaches more than 10%, the reflectivity of the ink layer 20 is far lower than 10%, when the ink layer 20 is used as a surface layer, the enamel feeling of the ceramic cannot be achieved, and the plastic feeling is serious. In one embodiment of the present application, the reflectance R of the ink layer 20₁Not more than 5%. Further, the reflectance R of the ink layer 20₁2%, 3%, 4% or 5%. In the present application, the reflectivity of the film is detected using a reflectivity measuring instrument.

In the present application, the thickness of the ink layer 20 is not particularly limited. In the embodiment of the present application, the thickness of the ink layer 20 is 35 μm to 50 μm. Further, the thickness of the ink layer 20 is 38 μm to 48 μm. Further, the thickness of the ink layer 20 is 40 μm to 45 μm. Specifically, the thickness of the ink layer 20 may be, but is not limited to, 35 μm, 42 μm, 45 μm, 47 μm, 49 μm, and the like. The ink layer 20 within this range can make the ceramic-like shell 100 have a better ceramic-like ground color, and at the same time, the thickness of the ceramic-like shell 100 is not increased too much, which is beneficial to the lightness and thinness of the whole structure. In the present embodiment, the ink layer 20 may include a plurality of ink seed layers; the specific number, thickness, material and color of the ink layers can be selected and adjusted according to the actual needs. Specifically, the number of the ink layers may be, but is not limited to, 2, 3, 4, 5, or 6 layers. In one embodiment, the thickness of the ink seed layer may be, but is not limited to, 5 μm to 25 μm. In another embodiment, at least one of the sub-inks has an optical transmittance of less than 50%, so that the transmittance of the ink layer 20 is reduced, and a ceramic-like ground color is better represented, which is closer to the texture of ceramic. Further, the optical transmittance of the ink layer 20 is less than 10%, so that a color effect closer to ceramic texture can be presented, and meanwhile, when the non-ceramic substrate 10 has a color appearance effect, the non-ceramic substrate 10 can be shielded, so that the influence on the appearance of the ceramic-like effect is avoided. In a specific embodiment, the ink layer 20 includes a first ink layer, a second ink layer and a third ink layer, which are stacked, wherein the first ink layer is disposed on the surface of the non-ceramic substrate 10.

In the present application, the liquid glass layer 30 is formed by coating liquid glass (liquid glass) and then curing, the liquid glass includes silicon dioxide and solvent, the solvent can be but is not limited to water, ethanol, etc., the liquid glass is liquid at room temperature, has better fluidity, and has glass state after volatilization, high hardness and high light transmittance, the liquid glass can be performed at room temperature, and can also be performed under heating state, optionally, the curing includes baking at 20-80 ℃ for 10-60 min, further, the curing includes baking at 30-70 ℃ for 15-45 min, in the present embodiment, the material of the liquid glass layer 30 includes silicon dioxide, in one embodiment, the silicon dioxide in the liquid glass layer 30 is nano-scale particles, optionally, the particle size of the silicon dioxide is less than 20nm, further, the particle size of the silicon dioxide is less than 15 nm. Thereby facilitating the dispersion of the silicon dioxide in the liquid glass and improving the light transmittance of the formed liquid glass layer 30. Specifically, the particle size of the silica may be, but is not limited to, 3nm, 5nm, 8nm, 10nm, 12nm, 16nm, or 18 nm. The liquid glass layer 30 is arranged between the ink layer 20 and the optical film layer 40, in the process of forming the liquid glass layer 30, the solvent is almost completely volatilized, a small amount of solvent remains in the liquid glass layer 30, and chemical bonds can be generated between the solvent and organic substances in the ink layer 20, so that the bonding force between the liquid glass layer 30 and the ink layer 20 is improved; meanwhile, chemical bonds are generated between substances in the liquid glass layer 30 and substances in the optical film layer 40, so that the bonding force between the liquid glass layer 30 and the optical film layer 40 is improved; when the ink layer 20 and the optical film layer 40 are directly laminated, only van der waals force exists between the ink layer 20 and the optical film layer 40, the bonding force is weak, the ink layer is easy to fall off, and the overall performance is influenced; this application has improved the cohesion of printing ink layer 20 with optics rete 40 through setting up liquid glass layer 30, promotes holistic wear resistance and corrosion resisting property, and liquid glass layer 30 light transmittance is good simultaneously, can not exert an influence to printing ink layer 20 and optics rete 40's outward appearance effect, helps the formation of imitative ceramic outward appearance.

In the present embodiment, the liquid glass layer 30 has a thickness of 5 μm or less. Further, the thickness of the liquid glass layer 30 is 2 μm to 4 μm, and further, the thickness of the liquid glass layer 30 is 2 μm to 3 μm. Specifically, the thickness of the liquid glass layer 30 may be, but is not limited to, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 3 μm, 3.5 μm, or 4.5 μm. By providing the liquid glass layer 30 with a small thickness, the quality of the ceramic-like casing 100 is not increased, and the overall bonding performance is improved. In the present application, the liquid glass layer 30 has high light transmittance. In the present embodiment, the optical transmittance of the liquid glass layer 30 is greater than 90%. Thereby avoiding an impact on the color appearance of ink layer 20.

In the present embodiment, the liquid glass layer 30 has a hardness H₂Greater than 3H and less than 9H. Further, the liquid glass layer 30 has a hardness H₂Is 4H-6H. Specifically, the liquid glass layer 30 has a hardness H₂But may not be limited to 3.5H, 4H, 5H, 6H, 7H, 8H or 9H. In the present embodiment, the liquid glass layer 30 has a reflectanceR₂Greater than 5% and less than 10%. Further, the liquid glass layer 30 has a reflectivity R₂6 to 9 percent. In particular, the reflectivity R of the liquid glass layer 30₂May be, but is not limited to, 5.5%, 6.5%, 7%, 8%, 8.5%, 9%, or 9.5%. In the present application, the reflectivity of the liquid glass layer 30 is close to the reflectivity of the ceramic, and thus when the optical film layer 40 falls off or cracks, the reflectivity of the ceramic can still be kept close to the reflectivity of the ceramic, so as to ensure the texture of the ceramic glaze of the ceramic-like shell 100, which is more beneficial to the application thereof.

In the present application, the optical film layer 40 is a layer of optical medium material that transmits light through its interface, and can change the reflection, refraction, etc. of light passing through the optical film layer 40, so that the ceramic-like casing 100 exhibits a certain gloss change. The reflectivity of the optical film layer 40 is changed by changing the material, thickness, layer number and the like of the optical film layer 40, so that different visual effects are realized, and the requirements under different scenes are met. In the present application, the optical transmittance of the optical film layer 40 is greater than 80%, 85% or 90% to avoid affecting the appearance of the bottom color of the ink layer 20.

In the present embodiment, the optical film layer 40 has a reflectance R₃Greater than or equal to 10%. Thereby achieving a reflectivity similar to or consistent with that of the ceramic, so that the ceramic-like shell 100 has an enamel feel of the ceramic. Further, R is more than or equal to 10 percent₃Less than or equal to 50 percent. Further, R is more than or equal to 10%₃Less than or equal to 15 percent and is more close to the reflectivity of ceramics, thereby being beneficial to the appearance of ceramic-like effect. Specifically, the reflectivity R of the optical film layer 40₃But may be, but is not limited to, 10%, 11%, 12%, 13%, 14%, 15%, 20%, 25%, etc. In the embodiment, the thickness of the optical film layer 40 is 100nm to 500nm, and specifically, may be, but is not limited to, 120nm, 130nm, 150nm, 180nm, 200nm, 300nm, and the like, so as to achieve a reflectance of 10% or more.

In the present application, the optical film layer 40 may have a single-layer film structure or a multi-layer film structure. When the optical film layer 40 is a multi-layer film structure, the material and thickness of each layer and the coordination among the layers can be controlled to achieve the desired reflectivity. Alternatively, the optical film layer 40 is formed by alternately laminating at least two optical films having different refractive indexes. Further, the optical film layer 40 is formed by alternately laminating at least two kinds of optical thin films having different refractive indexes periodically. The plurality of optical films may be made of the same material or have different thicknesses. The optical properties of the plurality of optical films are different. Specifically, the optical film layer 40 may include, but is not limited to, 2, 3, 4, 5, 6, 7, or 8 optical films.

In the present embodiment, the material of the optical film layer 40 may be inorganic or organic. In the embodiment of the present disclosure, the optical film layer 40 may be formed by, but not limited to, vapor deposition, such as physical vapor deposition or chemical vapor deposition, specifically, low pressure chemical vapor deposition, atmospheric pressure chemical vapor deposition, evaporation, sputtering, ion plating, and the like, and the optical film layer 40 may also be formed in a coating manner. In an embodiment of the present disclosure, the material of the optical film layer 40 includes an organic material, wherein the organic material includes at least one of polyether, polyester, fluoropolymer and silicon-containing polymer. When the material of the optical film layer 40 includes an organic substance, the optical film layer 40 has good flexibility and good bendability, and can be cut to obtain the optical film layer 40 with a required size, and a chemical bond is generated between the organic substance in the optical film layer 40 and the organic substance in the liquid glass layer 30, so that the binding force is improved. In another embodiment of the present disclosure, the material of the optical film layer 40 includes an inorganic substance, wherein the inorganic substance includes at least one of an inorganic oxide and an inorganic fluoride. When the material of the optical film layer 40 includes inorganic substances, chemical bonds are generated between the inorganic substances in the optical film layer 40 and the inorganic substances in the liquid glass layer 30, so as to improve the bonding force. Further, the inorganic substance includes SiO₂、TiO₂、Ti₃O₅、NbO₂、Nb₂O₃、NbO、Nb₂O₅And ZrO₂At least one of (1). In an embodiment of the present application, the optical film layer 40 is formed by alternately laminating at least two thin films having different refractive indexes. Optionally, the optical film layer 40 comprises SiO₂Layer, TiO₂Layer, Ti₃O₅Layer, NbO₂Layer, Nb₂O₃Layer, NbO layer, Nb₂O₅Layer and ZrO₂At least two of the layers. In one embodiment, the optical film 40 includes three layers of SiO₂Layer and three layers of Nb₂O₃Layer of SiO₂Layer and Nb₂O₃The layers are alternately stacked.

It will be appreciated that the ceramic-like shell 100 of the present application, when in use, has an outer surface 101 and an inner surface 102 that are oppositely disposed. Referring to fig. 2, a schematic structural diagram of a ceramic-like housing according to another embodiment of the present disclosure is shown, in which an ink layer 20, a liquid glass layer 30, and an optical film layer 40 are sequentially stacked on an outer surface 101 of a non-ceramic substrate 10. Thereby enabling the outer surface 101 to exhibit a texture similar to that of ceramic, facilitating its application.

In the present embodiment, the hardness of the ink layer 20, the liquid glass layer 30, and the optical film layer 40 gradually increases. Compare in printing ink layer 20 and optical film layer 40 direct contact, two-layer hardness direct difference is too big, hardness mismatch, produce wearing and tearing and drop easily, this application has the laminated structure of hardness change through the setting, receives external mechanical force effect when optical film layer 40, can transmit power to liquid glass layer 30 and printing ink layer 20, and the continuous change of hardness embodies the continuous change for deformation at this in-process, has avoided abrupt deformation fall, and then has promoted overall structure's wear resistance. In an embodiment of the present application, the hardness of the ink layer 20 is H₁The liquid glass layer 30 has a hardness of H₂The optical film layer 40 has a hardness of H₃Wherein H is₁≤3H，3H＜H₂＜9H，H₃Not less than 9H. Hardness between each layer changes gradually, and the hardness difference between two adjacent layers is less, when receiving external effort, can not produce obvious drop to be favorable to the promotion of wear resistance and corrosion resisting property more.

In the present embodiment, the reflectance of the ink layer 20, the liquid glass layer 30, and the optical film layer 40 gradually increases. By providing a laminate structure with a varying reflectivity, the liquid glass layer 30 can have a reflectivity that approximates a ceramic after the optical film layer 40 is worn, and the reflectivity can be modifiedThe reflectivity of the ink layer 20 is prevented from being directly presented within an acceptable range, so that the ceramic imitation effect cannot be realized, meanwhile, the gradual change of the reflectivity enables the light transmission process in the appearance effect to be more moderate, the gloss change is more natural, and the ceramic glaze texture presentation is facilitated. In an embodiment of the present application, the reflectivity of the ink layer 20 is R₁The liquid glass layer 30 has a reflectivity of R₂The optical film layer 40 has a reflectivity of R₃Wherein R is₁≤5％，5％＜R₂＜10％，R₃Not less than 10%. Further, the reflectivity of the optical film layer 40 is 10% to 15%. The reflectivity between each layer gradually changes, the reflectivity difference between two adjacent layers is small, and the reflectivity of the optical film layer 40 is similar to or the same as that of the ceramic, so that the ceramic-like shell 100 has the enamel feeling of the ceramic.

Referring to fig. 3, a schematic structural diagram of a ceramic-like housing according to another embodiment of the present disclosure is substantially the same as that of fig. 1, except that the ceramic-like housing further includes a functional layer 50, and the functional layer 50 may be, but is not limited to, an anti-fingerprint layer, an anti-glare layer, and the like, so as to improve the usability of the ceramic-like housing 100. In the present embodiment, the functional layer 50 has an optical transmittance of more than 90% and a thickness of less than 50 μm. Through setting up thinner thickness and high non-light tight functional layer 50 to avoid functional layer 50 to the too much influence of optical film layer 40 reflectivity, be favorable to the realization of ceramic outward appearance effect, can promote the performance of imitative ceramic casing 100 again simultaneously.

In the present application, when the non-ceramic substrate 10 includes a metal substrate, since metal has a shielding effect on signals, a gap is mainly formed in the metal substrate, and an insulating material is filled in the gap to serve as an antenna micro; when the non-ceramic substrate 10 is used as a shell, due to the adoption of two materials, the colors of most metals and insulating substances are obviously different, so that an obvious area appears on the appearance, and the integration effect is not facilitated. In an embodiment of the present application, when the non-ceramic substrate 10 in the ceramic-like casing 100 includes a metal substrate, and after a gap is opened in the non-ceramic substrate 10 and an insulating material is filled in the gap, the ink layer 20, the liquid glass layer 30 and the optical film layer 40 are stacked to present a ceramic color texture, so as to shield the insulating material, improve an appearance effect, and facilitate application thereof.

In the embodiments of the present application, the ceramic shell 100 provided by the present application has excellent wear resistance and corrosion resistance. In one embodiment, the denim friction test, the steel wire ball friction test and the artificial sweat test show that the ceramic-like shell 100 provided by the present application has slight scratch on the optical film layer 40 after 900 times of friction, and has no color change on the surface of the optical film layer 40 after 84 h. In one embodiment, the hardness of the ink layer 20 is H₁The liquid glass layer 30 has a hardness of H₂The optical film layer 40 has a hardness of H₃Wherein H is₁≤3H，3H＜H₂＜9H，H₃The optical film layer 40 is slightly scratched after being rubbed for 1000 times, the surface of the optical film layer 40 does not change color after 96 hours, and the optical film layer has excellent service performance. In the application, the denim friction test comprises the steps of binding denim or steel wool as a friction object on a grinding head of a linear friction instrument device, and observing the surface abrasion condition under the given friction times when the load is 1kg, the friction contact area is 2cm multiplied by 2cm and the friction stroke is 50 mm; the ceramic-like casing 100 is wrapped in a dust-free cloth soaked with artificial sweat (NaCl and ammonia water as main components), placed in a high-temperature and high-humidity environment (55 ℃ and 95% humidity), and taken out to observe the surface condition of the ceramic-like casing 100 after being placed for a certain time.

In the present embodiment, by comparing the ceramic shell 100 and the ceramic shell having the same color as the ceramic shell 100, the difference in color between the two is not more than 1, and the difference in reflectance is not more than 3%. The ceramic-like shell 100 provided by the application has ceramic color and enamel feeling, and can realize ceramic appearance effect.

The present application further provides a flow chart of a method for preparing the ceramic shell, where the method for preparing the ceramic shell 100 according to any of the above embodiments includes: the ink layer 20, the liquid glass layer 30 and the optical film layer 40 are formed on the non-ceramic substrate 10 in sequence to obtain the ceramic-like shell 100.

Referring to fig. 4, a flow chart of a method for manufacturing a ceramic shell according to an embodiment of the present disclosure includes:

operation 101: and coating ink on the non-ceramic substrate, and curing to form an ink layer.

Operation 102: and coating liquid glass on the ink layer, and curing to form a liquid glass layer.

Operation 103: an optical film layer is formed on the liquid glass layer by vapor deposition.

In operation 101, the shape, size, material, etc. of the non-ceramic substrate 10 are not limited and may be selected according to actual needs. In the present application, the ceramic-like housing 100 may be, but is not limited to, a back case and/or a middle frame of an electronic device. For example, the non-ceramic substrate 10 may be formed in the shape of an electronic device case, or a film layer may be formed on the non-ceramic substrate 10 and then formed in the shape of an electronic device case. In the present embodiment, the ink layer 20 may be formed by applying the ink and then curing. Specifically, the ink may be applied by, but not limited to, coating, printing, casting, calendering, and the like. In one embodiment, during the ink coating process, a mask plate may be provided to form the ink layer 20 with various appearance effects, such as pattern effect, color impact effect, etc., so as to enrich the visual effect of the ceramic-like housing 100. In another embodiment, the ink layer 20 can be formed by coating ink for multiple times and curing the ink for multiple times, so as to improve the usability of the ink layer 20.

In operation 102, the liquid glass includes silica and a solvent, which may be, but is not limited to, water, ethanol, and the like. In one embodiment, curing comprises baking at 20-80 ℃ for 10-60 min. By controlling the amount of liquid glass applied, the thickness of the liquid glass layer 30 is controlled. In one embodiment, the liquid glass layer 30 has a thickness less than or equal to 5 μm. By providing the liquid glass layer 30 with a small thickness, the quality of the ceramic-like casing 100 is not increased, and the overall bonding performance is improved.

In operation 103, the optical film layer 40 may be formed by, but not limited to, physical vapor deposition or chemical vapor deposition, such as low pressure chemical vapor deposition, atmospheric pressure chemical vapor deposition, evaporation, sputtering, ion plating, etcAnd a type optical film layer 40. In one embodiment, before forming the optical film layer 40, the ion bombardment treatment is further performed on the liquid glass layer 30. Specifically, the method may include, but is not limited to, introducing argon (Ar) gas into a vacuum environment and ionizing electrically neutral Ar atoms to generate Ar⁺Ar with electric charge⁺The surface of the liquid glass layer 30 is impacted under the action of the electric field, and the chemical bonds on the surface of the liquid glass layer 30 are broken, so that an active interface is generated. Therefore, when the optical film layer 40 is formed subsequently, a chemical bond can be formed between the optical film layer and inorganic substances in the optical film layer 40, such as silicon dioxide, and the like, so that the stability and reliability of the interface are improved, and the wear resistance and corrosion resistance of the whole structure are improved.

In the present embodiment, the method further includes forming a functional layer 50 on the surface of the optical film layer 40. In one embodiment, the functional layer 50 includes at least one of an anti-fingerprint layer and an anti-glare layer. The anti-fingerprint layer has the functions of preventing pollution and preventing fingerprint adhesion. Specifically, the contact angle of the surface of the anti-fingerprint layer can be but is not limited to be larger than 105 degrees, which is beneficial to improving the surface anti-fingerprint and pollutant attachment capability; the anti-glare layer can reduce the glare effect, so that the ceramic-like shell 100 is closer to the texture of real ceramic.

In the present embodiment, after the ink layer 20, the liquid glass layer 30, and the optical film layer 40 are formed on the non-ceramic substrate 10, the ceramic-like case 100 having a desired shape may be formed through a high pressure forming process. For example, 3D hot bending may be performed in a high pressure forming machine to obtain a 3D ceramic shell 100 of a desired curvature. Specifically, the molding pressure can be, but is not limited to, 15Bar-100Bar at 150-300 ℃, and the hot pressing is carried out for 0.5min-5 min. When the required ceramic-like casing 100 is in a shape with a certain radian, such as 2.5D, 3D, etc., hot press molding can be performed after each film layer is molded on the non-ceramic substrate 10, which is beneficial to the preparation of each film layer, so that the distribution of each film layer on the non-ceramic substrate 10 is uniform.

In the embodiment of the application, the computer numerical control precision machining (CNC machining) is further carried out on the ceramic simulating shell 100. Redundant leftover materials can be milled out through CNC machining, and the ceramic-like shell 100 with the finally needed assembly matching size is obtained.

The preparation method of the ceramic-like shell 100 is simple to operate, easy for large-scale production, high in preparation efficiency and yield, and capable of preparing the ceramic-like shell 100 with a ceramic effect and beneficial to application of the ceramic-like shell.

The application also provides an electronic device comprising the ceramic-like housing 100 of any of the above embodiments. It is understood that the electronic device may be, but is not limited to, a cell phone, a tablet, a laptop, a watch, MP3, MP4, GPS navigator, digital camera, etc. In an embodiment of the present application, an electronic device includes a ceramic-like housing including the ceramic-like housing 100 of any of the above embodiments, and a motherboard. Through setting up imitative ceramic casing 100 for electronic equipment under the prerequisite of not using ceramic material, has realized the outward appearance of ceramic feel, has avoided current ceramic product yields and productivity not high, can't realize the problem of using on a large scale in electronic equipment, thereby has promoted electronic equipment's outward appearance effect diversification, reinforcing product competitiveness.

Examples

A ceramic-like shell comprises a non-ceramic substrate, an ink layer, a liquid glass layer and an optical film layer which are sequentially stacked, wherein the non-ceramic substrate is an aluminum alloy; the ink layer comprises a primer layer, a middle paint layer and a finish paint layer, the total thickness of the ink layer is 35 mu m, the hardness is 3H, the reflectivity is 5%, and the ink layer is white; the thickness of the liquid glass layer is 3 mu m, the hardness is 6H, and the reflectivity is 8%; the optical film layer is three layers of SiO₂Layer and three layers of Nb₂O₃Layer of SiO₂Layer and Nb₂O₃Layers alternately laminated, SiO₂Layer arranged on the surface of liquid glass layer, SiO₂The thickness of the layer is 40nm, Nb₂O₃The thickness of the layer was 5nm, the hardness of the optical film layer was 9H, and the reflectance was 12%. As can be seen by observation, the ceramic-like shell has the appearance color and the glaze texture of the ceramic.

Effects of the embodiment

A case is provided which is substantially the same as the ceramic-like case of the example except that a liquid glass layer is not included as a comparative example.

The shells of the examples and the comparative examples were subjected to the same denim friction test, steel wire ball friction test and artificial sweat test, and the results are shown in table 1, wherein the denim friction test and the steel wire ball friction test comprise binding denim or steel wool as a friction material on a linear tribometer equipment grinding head, observing the wear condition of the product surface at a given friction number under a load of 1kg, a friction contact area of 2cm × 2cm, and a friction stroke of 50 mm; wrapping the product in a dust-free cloth soaked with artificial sweat (mainly composed of NaCl and ammonia water), placing in high temperature and high humidity environment (55 deg.C, 95% humidity), standing for a certain time, taking out, and observing whether the surface of the product is corroded or discolored.

Table 1 effects examples test results

	Denim friction test	Steel wire ball friction test	Artificial sweat test
				Examples	500 times of grinding through of optical film layer	50-time grinding-through of optical film layer	Surface discoloration for 96h
Comparative example	1000 times of slight scratch of optical film layer	1000 times of slight scratch of optical film layer	Surface is unchanged for 96hColor(s)

Compared with the shell provided by the comparative example, the ceramic-like shell provided by the embodiment of the application is closer to the texture of ceramic in appearance; and discover in the performance detects, set up liquid glass layer in the imitative ceramic casing that this application provided for bonding property between each layer is more excellent, and synergism has promoted wearability and corrosion resistance between each layer, and the wholeness can be excellent, more is favorable to the application.

The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The ceramic-like shell is characterized by comprising a non-ceramic substrate, an ink layer, a liquid glass layer and an optical film layer which are sequentially stacked.

2. The ceramic-like casing of claim 1, wherein the ink layer, the liquid glass layer, and the optical film layer gradually increase in hardness.

3. The ceramic-like casing of claim 2, wherein the ink layer has a hardness of H₁The liquid glass layer has a hardness of H₂The hardness of the optical film layer is H₃Wherein H is₁≤3H，3H＜H₂＜9H，H₃≥9H。

4. The ceramic-like casing of claim 1, wherein the ink layer, the liquid glass layer, and the optical film layer have progressively increasing reflectivity.

5. The ceramic-like casing of claim 4, wherein the ink layer has a reflectance of R₁The liquid glass layer has a reflectivity of R₂The reflectivity of the optical film layer is R₃Wherein R is₁≤5％，5％＜R₂＜10％，R₃≥10％。

6. The ceramic-like casing of claim 5, wherein the optical film layer has a reflectivity of 10% to 15%.

7. The ceramic-like casing of claim 1, wherein the liquid glass layer has a thickness of 5 μm or less and an optical transmittance of greater than 90%.

8. The ceramic-like casing of claim 1, wherein the liquid glass layer comprises silica having a particle size of less than 20 nm.

9. The ceramic-like casing of claim 1, wherein the non-ceramic substrate comprises at least one of glass, metal, and plastic.

10. A preparation method of a ceramic-like shell is characterized by comprising the following steps:

11. The method of claim 10, comprising:

coating ink on the non-ceramic substrate, and forming the ink layer after curing;

coating liquid glass on the ink layer, and forming the liquid glass layer after curing;

forming the optical film layer on the liquid glass layer by vapor deposition.

12. The method of claim 11, further comprising subjecting the liquid glass layer to an ion bombardment treatment prior to forming the optical film layer.

13. The electronic equipment is characterized by comprising an imitation ceramic shell and a mainboard, wherein the imitation ceramic shell comprises a non-ceramic substrate, an ink layer, a liquid glass layer and an optical film layer which are sequentially stacked.