CN110949051A

CN110949051A - Surface treatment method of ceramic piece, electronic equipment and shell thereof

Info

Publication number: CN110949051A
Application number: CN201911346619.7A
Authority: CN
Inventors: 赵岩峰
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-03

Abstract

The application provides a surface treatment method of a ceramic piece, electronic equipment and a shell thereof. The surface treatment method comprises the following steps: forming an optical coating layer on the surface of the ceramic piece; forming a heat insulation film on the surface of the optical coating layer away from the ceramic part; removing the optical coating layer which is not protected by the heat insulation film to form an optical coating pattern; carrying out laser treatment on the surfaces of the ceramic piece and the heat insulation film so as to enable the surface of the ceramic piece which is not protected by the heat insulation film to have textures; and removing the heat insulation film. According to the surface treatment method, the optical coating pattern is protected by the heat insulation film, laser etching is performed, and the area of the optical coating pattern is not required to be avoided, so that the optical coating pattern can be protected from being damaged by the laser etching by the heat insulation film, and the laser etching pattern and the optical coating pattern are not interfered with each other after the heat insulation film is removed, so that the recognition degree of marks and the like on the ceramic piece after surface treatment is higher.

Description

Surface treatment method of ceramic piece, electronic equipment and shell thereof

Technical Field

The application relates to the technical field of shell surface treatment of electronic equipment, in particular to a surface treatment method of a ceramic piece, the electronic equipment and a shell of the electronic equipment.

Background

The zirconia ceramics have the properties of high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and the like, and are widely applied to the fields of rear covers, middle frames and the like as mobile phone structural members, so that the zirconia ceramics are popular with consumers.

The ceramic products are decorated using colored ceramics or other spray, sputter (PVD) processes for aesthetic and light weight designs, but the high gloss ceramic surface gives a constant effect. Therefore, beautiful texture patterns can be added to the rear cover of the mobile phone, so that on one hand, the decorative effect of the ceramic surface can be increased, and on the other hand, the appearance effect of light and shade alternation or sub-light contrast is designed on the rear cover of the mobile phone; on the other hand, the mobile phone can be stably placed on a desktop, so that the mobile phone is ensured not to fall off. However, in the process, the ceramic surface is covered by the textured concave-convex pattern, and then a pattern layer (Logo) is formed on the textured surface, referring to fig. 1, a reserved area D (e.g. a white area in fig. 1) of the Logo (e.g. ABC in fig. 1) has more saw teeth under the influence of the textured pattern, thereby influencing Logo recognition.

Disclosure of Invention

An object of the present invention is to provide a surface treatment method for a ceramic part, a housing of an electronic device manufactured by using the surface treatment method, and an electronic device using the housing, so as to solve at least one of the above problems in the prior art, and achieve an appearance effect that a texture and an optical coating pattern do not interfere with each other and that a ceramic aesthetic feeling is better.

In a first aspect of the present application, a method for surface treatment of a ceramic part is presented.

According to an embodiment of the present application, the surface treatment method includes: forming an optical coating layer on the surface of the ceramic piece; forming a heat insulation film on the surface of the optical coating layer far away from the ceramic piece; removing the optical coating layer which is not protected by the heat insulation film to form an optical coating pattern; carrying out laser processing on the surfaces of the ceramic piece and the heat insulation film so as to enable the surface of the ceramic piece which is not protected by the heat insulation film to have textures; and removing the heat insulation film.

By adopting the surface treatment method provided by the embodiment of the application, the optical coating pattern is protected by the heat insulation film, then laser etching is carried out without avoiding the area of the optical coating pattern, so that the optical coating pattern can be protected from being damaged by the laser etching by the heat insulation film, and the laser etching texture and the optical coating pattern are not interfered with each other after the heat insulation film is removed, so that the sawtooth phenomenon of the laser etching texture can be avoided, and the identification degree of the mark and the like on the ceramic piece after surface treatment is higher.

In a second aspect of the present application, a housing for an electronic device is presented.

According to an embodiment of the application, at least part of the housing is formed by a ceramic piece, and the ceramic piece is obtained by the above-mentioned surface treatment method.

The utility model provides an electronic equipment's casing, the discernment degree of sign is higher and ceramic aesthetic feeling outward appearance is better on its partial ceramic member to make electronic equipment's casing not only mechanical properties better, ceramic feel better and the sign is more clear, and then make electronic equipment's casing outward appearance higher-end fashion.

In a third aspect of the present application, an electronic device is presented.

According to an embodiment of the present application, the electronic device includes: the above-mentioned housing; a display device coupled to the housing.

The electronic equipment of the embodiment of the application has the advantages that the mechanical property of the shell is higher, the ceramic texture is better, and the mark is clearer, so that the market competitiveness of the electronic equipment is higher. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the housing of the electronic device, which are not described in detail herein, still apply to the electronic device.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing aspects of the present application are explained with reference to the following description of embodiments, taken in connection with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a top view of a conventional design for forming a patterned layer in a pre-defined area of a textured pattern;

FIG. 2 is a schematic cross-sectional structure of a conventional design for forming a patterned layer in a reserved area in a grain pattern;

FIG. 3 is a schematic flow chart of a method for treating the surface of a ceramic part according to one embodiment of the present application;

FIG. 4 is a schematic top view of a surface treatment process according to one embodiment of the present application;

FIG. 5 is a schematic cross-sectional structure of a product at various steps of a surface treatment method according to an embodiment of the present application;

FIG. 6 is a schematic top view of the texture and the optical coating pattern formed in step S500 according to an embodiment of the present disclosure;

fig. 7 is a schematic perspective view of an appearance effect of the electronic device of the present application.

Reference numerals

100 ceramic part

110 texture

200 optical coating layer

210 optical coating pattern

201 patterned layer

300 Heat insulating film

10 casing

20 display device

1 electronic device

Detailed Description

The following examples are presented in detail and are not to be construed as limiting the present application, as those skilled in the art will appreciate. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.

In one aspect of the present application, a method of surface treating a ceramic part is presented. According to an embodiment of the present application, referring to fig. 3, the surface treatment method includes:

s100: and forming an optical coating layer on the surface of the ceramic piece.

In this step, an optical coating layer 200 is formed on the surface of the ceramic piece 100. According to an embodiment of the present invention, a method of forming the optical coating layer 200, such as Physical Vapor Deposition (PVD), may be selected accordingly according to the specific material forming the optical coating layer 200. In addition, the top view and the cross-sectional structure of the product manufactured by this step are schematically shown, and reference may be made to fig. 4 (a) and fig. 5 (a), respectively.

In some embodiments of the present invention, for titanium nitride (TiN) which can form light yellow, golden yellow, brown yellow or black, or titanium carbide (TiC) which can form light gray, dark gray or black, the ceramic piece is cleaned by degreasing lotion, organic solvent and ultrasonic deionized water in sequence, then manually wiped, rapidly dried and blow-dried, and then placed into a vacuum furnace to be heated to 80-100 ℃ for 10-20 minutes, and then heated to 2-5 × 10^-3Vacuumizing for 30-40 minutes under the vacuum degree of Pa, continuously introducing argon gas, starting a pulse bias power supply to perform glow cleaning on the substrate membrane, introducing a small amount of argon gas after the glow cleaning is finished, starting a metal target material, closing a target material shielding cover to perform decontamination treatment on the surface of the target material, and finally starting a magnetic control target material, opening the magnetic control target material shielding cover and introducing gas to deposit a color film on the surface of the membrane. Therefore, the plating pretreatment of multiple cleaning can be more beneficial to flattening the peak of the optical coating layer formed by subsequent deposition; the heating of the vacuum furnace can fully release impurity gases on the surface of the ceramic sample, and the impurity gases are exhausted by vacuumizing, so that the influence on the purity of a coating layer, the binding force of the coating layer and the wear resistance of the coating layer caused by the release in the coating process is avoided; the higher the vacuum environment is, the higher the purity of the coating layer is, and the better the binding force is; the ion beam cleans the surface of the target material, and can remove a metal oxide thin layer on the surface of the target material, thereby reducing the pollution to the film layer; cleaning a substrate membrane by using high-strength plasma and activating surface chemical bond action, wherein the ion beam can clean the surface of the target material for 5-10 minutes; the specific color of the deposited color film can be designed according to needs, and the thickness of each film is controlled by the deposition time and the film thickness measuring device, so that the accurate deposition of the film is realized.

In some embodiments of the invention, the ceramic piece may comprise at least part of a housing of the electronic device, in particular, for example, a middle frame, a back cover, a key or a camera holder of the electronic device. Thus, the middle frame and the rear cover of the shell, and the keys and the camera support on the shell can also be formed by ceramic parts with high strength, high gloss and high fracture toughness.

In some embodiments of the invention, the ceramic part may be purchased or prepared directly, the preparation steps including forming a ceramic blank, binder removal, sintering and CNC machining, grinding and polishing, etc.; mixing raw material powder with a binder, and then performing injection molding, tape casting or dry pressing to obtain the ceramic green body, wherein the raw material powder of the ceramic can be alumina powder, zirconia powder or zirconium nitride powder or a mixture thereof, the powder purity is more than 99.99%, the binder can be at least one of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate and polyformaldehyde, and the content of the raw material powder can be 70-99 wt% and the content of the binder is 1-30 wt% based on the total weight of the raw material powder and the binder; then, the sample is placed in a glue discharging box for glue discharging or degreasing, the glue discharging temperature is 300-900 ℃, the time is controlled to be 0.5-4 hours, and the sample after glue discharging or degreasing has no problems of distortion, cracking, discoloration and the like; placing the blank after the binder removal into a sintering furnace, and sintering in a reducing or oxidizing or inert atmosphere at the sintering temperature of more than 1200 ℃ for 0.5-10 hours; and finally, CNC machining, grinding and polishing, and full inspection to prepare the ceramic part.

S200: and forming a heat insulation film on the surface of the optical coating layer far away from the ceramic piece.

In this step, the thermal insulating film 300 is continuously formed on the surface of the optical coating layer 200 away from the ceramic 100. According to the embodiment of the present invention, the desired character form or pattern form can be processed by die cutting or laser etching process in advance, and then the processed character form or pattern form can be attached to the surface of the optical coating layer 200 far away from the ceramic 100. In addition, the top view and the cross-sectional structure of the product manufactured by this step can be referred to fig. 4 (b) and fig. 5 (b), respectively.

In some embodiments of the present invention, the material forming the thermal barrier film 300 may include at least one of metal, rubber, and ceramic, so that the optical coating layer 200 may be sufficiently protected by the thermal barrier film 300 using the above material. In some embodiments, the thickness of the thermal insulation film 300 may be 0.05-0.3 mm, so that the thermal insulation film 300 with the above thickness can prevent the damage of the laser etching to the optical coating layer 200. In some specific examples, the cross-sectional shape (i.e., the shape from a top view) of the thermal barrier film 300 can include at least one of a logo, a chinese character, and a character, such as the letters ABC shown in fig. 1 or 6, for example.

S300: and removing the optical coating layer which is not protected by the heat insulation film to form the optical coating pattern.

In this step, the optical coating layer 200, which is not protected by the heat insulating film 300, is deplated to form the optical coating pattern 210. Specifically, the optical coating layer 200 may be treated by a deplating solution, so that the optical coating pattern 210 is formed on the optical coating layer 200 protected by the thermal insulating film 300. In addition, the top view and the cross-sectional structure of the product manufactured by this step can be referred to fig. 4 (c) and fig. 5 (c), respectively.

In some embodiments of the present invention, the stripping solution used for stripping may be acidic, alkaline or neutral, and the specific acid-base of the stripping solution is selected according to the actual structure and material of the optical coating layer 200, but the stripping solution cannot penetrate into the thermal insulating film 300 to prevent the characters under the thermal insulating film from being damaged.

S400: and carrying out laser treatment on the surfaces of the ceramic piece and the heat insulation film so as to enable the surface of the ceramic piece which is not protected by the heat insulation film to have textures.

In this step, the surfaces of the ceramic piece 100 and the heat insulating film 300 are directly subjected to laser processing to provide the texture 110 to the surface of the ceramic piece 100 which is not protected by the heat insulating film 300. Thus, the laser etching does not need to avoid the area where the optical coating pattern 210 is located, so that a large amount of saw teeth of the laser etching patterns in the reserved area of the optical coating pattern can be thoroughly avoided. In addition, the top view and the cross-sectional structure of the product manufactured by this step can be referred to fig. 4 (d) and fig. 5 (d), respectively.

Specifically, a ceramic piece is placed on a clamp jig fixed on a laser platform, and a vacuum adsorption device is used for adsorbing a sample on the surface of the platform so as to ensure the uniformity of texture processing and avoid texture defects or uneven color; the oil removing and grease removing process can remove grease from the ceramic part, and then the ceramic part is soaked in a low-alkaline solution, wherein the pH value of the low-alkaline cleaning solution is 9-12 generally. The grease removing efficiency is high, the corrosion to equipment is low, the damage to the surface state of a workpiece is small, and the grease removing agent can be used at low temperature and medium temperature. The low-alkalinity cleaning agent mainly comprises inorganic low-alkalinity auxiliary agent, surfactant, defoaming agent and the like; the inorganic auxiliary agent is mainly sodium silicate, sodium tripolyphosphate, sodium phosphate or sodium carbonate and the like, and has the functions of providing a certain alkalinity, facilitating dispersion and suspension, and preventing the removed grease from being adsorbed on the surface of the workpiece again; the surfactant mainly adopts nonionic and anionic surfactants, polyvinyl chloride and sulfonate, and plays a main role in the process of removing the grease. The carbon dioxide laser or the infrared equipment selected by the laser processing is preheated, and stable operation is ensured, so that the uniformity of texture processing is ensured, and texture defects or uneven color are avoided.

In addition, inert gases such as nitrogen, argon and the like can be introduced to ensure that the color of the product is not changed; processing the ceramic surface according to the designed pattern, wherein the processing parameters relate to laser power, laser speed, pulse power and the like, the specific process parameters can be optical fiber wavelength of 1064nm, light spot diameter of 8-10 mm and pulse power of 20-40 kHz, the laser power is set to be 50W, the laser processing speed is 0.2-10 mm/s, the distance between the laser and the sample surface is 5-20 cm, and the processing power is 20% -90%; forming a required texture structure on the surface of the ceramic by computer control processing; for the arc-shaped area of the product, a clamping jig can be used for enabling the sample to rotate along with the focus to be processed at the arc surface; in addition, because the product generates heat seriously in the laser etching process, a water cooling or air cooling system needs to be arranged below the product to avoid cracking of the ceramic sample, so as to ensure that the sample is cooled in time to avoid cracking.

In some embodiments of the present invention, the depth of the texture 110 formed by the laser processing may be 0.01 to 0.2mm, the line width may be 0.02 to 0.2mm, and the line distance may be 0.05 to 0.3mm, so that the texture 110 of the designed size may be obtained by the laser processing, which may increase the friction on the surface of the ceramic member, thereby making the ceramic member less likely to slip.

In some embodiments, because the surface is partially ablated during the laser etching process, the surface may have slight scratching problems, and the surface may have microcracks due to the laser etching process, so that the surface needs to be polished to ensure the strength of the ceramic. Specifically, the ceramic polishing process may include fixing the ceramic product with a processing jig, spraying polishing solution (mainly including diamond, silica, alumina, and other conventional polishing substances in the industry) on the surface, and finely polishing with a white buff or a pig hair brush to remove the residual zirconia particles on the surface; the polishing time can be 5-60 min. After the ceramic piece is treated, the ceramic piece can be ultrasonically cleaned for 5min by using alcohol and the like, and water stains on the surface can be dried; and adjusting the color formed by surface etching through heat treatment, wherein the temperature range of the heat treatment can be 800-850 ℃, and the heating time is 0.2-5 hours.

S500: and removing the heat insulation film.

In this step, the thermal insulating film 300 after the laser etching in step S400 is removed, specifically, for example, by means of peeling or thermal peeling. In addition, the step produces schematic diagrams of the top view and the cross-sectional structure of the product, and reference can be made to fig. 4 (e) and fig. 5 (e), respectively. Thus, after the thermal insulation film 300 is removed, referring to fig. 6, the texture 110 and the optical coating pattern 210 do not interfere with each other, so that the sawtooth phenomenon of the laser etching texture can be avoided, and the recognition degree of the marks and the like on the ceramic piece after surface treatment is higher.

In summary, according to the embodiments of the present application, a surface treatment method is provided, in which an optical coating pattern is protected by a thermal insulation film, and then laser etching is performed without avoiding an area of the optical coating pattern, so that the optical coating pattern is protected by the thermal insulation film from being damaged by the laser etching, and the laser etching pattern and the optical coating pattern do not interfere with each other after the thermal insulation film is removed, thereby avoiding a sawtooth phenomenon of the laser etching pattern, and further improving a recognition degree of a mark and the like on a surface-treated ceramic piece.

In another aspect of the present application, a housing for an electronic device is presented. According to an embodiment of the present application, at least part of the housing 10 is formed by a ceramic piece, and the ceramic piece is obtained by the surface treatment method described above.

In some embodiments of the invention, at least one of the middle frame, the rear cover, the key and the camera holder of the housing is formed of a ceramic piece. So, the center and the back lid of casing not only can be formed by high strength, the high gloss and the ceramic member of high fracture toughness, and in addition, button and camera support on the casing also can be formed by the higher ceramic member of sign recognition degree to the outward appearance effect that makes each angle of electronic equipment's casing is all better.

In summary, according to the embodiments of the present application, the present application provides a housing of an electronic device, where the recognition degree of the mark on the ceramic part is higher and the aesthetic appearance of the ceramic is better, so that the housing of the electronic device has better mechanical properties, better ceramic texture and clearer mark, and the housing of the electronic device has a higher appearance and is more fashionable.

In another aspect of the present application, an electronic device is presented. According to an embodiment of the present application, referring to fig. 7, the electronic device 1 includes the housing 10 and the display device 20 described above, and the display device 20 is connected to the housing 10.

According to the embodiment of the present invention, the specific type of the electronic device is not particularly limited, such as a mobile phone, a tablet computer, a smart watch, and the like, and those skilled in the art may select the electronic device according to the specific application of the electronic device, which is not described herein again. It should be noted that, besides the above-mentioned housing and display device, the electronic device further includes other necessary components and structures, specifically, for example, a mobile phone, such as a processor, a memory, a battery, a circuit board, a camera, and the like, and those skilled in the art can design and supplement the electronic device according to the specific type of the electronic device, and details are not described herein again.

In summary, according to the embodiments of the present application, the present application provides an electronic device, wherein the housing of the electronic device has a higher mechanical property, a better ceramic texture and a clearer mark, so that the market competitiveness of the electronic device is higher. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the housing of the electronic device, which are not described in detail herein, still apply to the electronic device.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A method for surface treatment of a ceramic part, comprising:

forming an optical coating layer on the surface of the ceramic piece;

forming a heat insulation film on the surface of the optical coating layer far away from the ceramic piece;

removing the optical coating layer which is not protected by the heat insulation film to form an optical coating pattern;

carrying out laser processing on the surfaces of the ceramic piece and the heat insulation film so as to enable the surface of the ceramic piece which is not protected by the heat insulation film to have textures;

and removing the heat insulation film.

2. The surface treatment method according to claim 1, wherein a material forming the heat insulating film includes at least one of metal, rubber, and ceramic.

3. The surface treatment method according to claim 1, wherein the thickness of the heat insulating film is 0.05 to 0.3 mm.

4. The surface treatment method according to claim 1, wherein the cross-sectional shape of the heat insulating film includes at least one of a logo, a chinese character, and a character.

5. The surface treatment method according to claim 1, wherein the deplating solution used for the deplating is acidic, alkaline or neutral.

6. The surface treatment method according to claim 1, wherein the depth of the texture formed by the laser treatment is 0.01 to 0.2mm, the line width is 0.02 to 0.2mm, and the line pitch is 0.05 to 0.3 mm.

7. A surface treatment method according to claim 1, wherein the ceramic piece comprises at least a part of a housing of an electronic device.

8. A housing for an electronic device, characterized in that at least part of the housing is formed by a ceramic piece, and the ceramic piece is obtained by the surface treatment method according to any one of claims 1 to 7.

9. The housing of claim 8, wherein at least one of the middle frame, the back cover, the keys, and the camera holder of the housing is formed from the ceramic piece.

10. An electronic device, comprising:

the housing of claim 8 or 9;

a display device coupled to the housing.