CN110757630A - Preparation method of ceramic structural member, ceramic structural member and electronic equipment - Google Patents
Preparation method of ceramic structural member, ceramic structural member and electronic equipment Download PDFInfo
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- CN110757630A CN110757630A CN201910965071.8A CN201910965071A CN110757630A CN 110757630 A CN110757630 A CN 110757630A CN 201910965071 A CN201910965071 A CN 201910965071A CN 110757630 A CN110757630 A CN 110757630A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
- B28B11/005—Using heat to allow reshaping, e.g. to soften ceramic articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/12—Apparatus or processes for treating or working the shaped or preshaped articles for removing parts of the articles by cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
- H04M1/185—Improving the rigidity of the casing or resistance to shocks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9646—Optical properties
- C04B2235/9661—Colour
Abstract
The application relates to a preparation method of a ceramic structural component, the ceramic structural component and electronic equipment, wherein the preparation method of the ceramic structural component comprises the following steps: obtaining a shaping mold, wherein the shaping mold is provided with a shaping surface, and the shaping surface comprises a curved surface; obtaining a ceramic body, and placing the ceramic body on the plastic surface; heating the ceramic body to soften the ceramic body; and bending the softened ceramic blank under the action of air pressure difference and adsorbing the ceramic blank on the curved surface. The ceramic blank body of the embodiment of the application does not need to reserve excessive machining allowance before hot bending forming, so that the machining cost can be greatly reduced, and the production efficiency can be improved. In addition, the ceramic blank softened by heating is bent by adopting an air pressure difference mode, so that the generation of die marks on the surface of the ceramic blank can be avoided or reduced.
Description
Technical Field
The present disclosure relates to the field of electronic devices, and particularly to a method for manufacturing a ceramic structural member, and an electronic device.
Background
Ceramic structural members have high strength, high gloss, high fracture toughness, and excellent heat insulating properties, and are widely used for middle frames and rear covers of electronic devices. In order to prepare a ceramic structural member, a ceramic blank is obtained by casting, dry pressing and injection molding a mixed ceramic slurry, and then the ceramic blank is subjected to binder removal, degreasing and sintering to obtain a ceramic sintered blank, wherein in order to obtain a curved surface ceramic structural member with a proper shape and curvature through CNC machining, enough machining allowance needs to be reserved for the obtained ceramic sintered blank, for example, in order to prepare a ceramic structural member with a thickness of 0.45mm, a machining allowance of 0.3mm needs to be reserved for a single side of the ceramic sintered blank. It follows that more machining allowance will result in higher machining cost and lower production efficiency.
Disclosure of Invention
The embodiment of the application provides a preparation method of a ceramic structural member, the ceramic structural member prepared by the preparation method and electronic equipment comprising the ceramic structural member, and aims to solve the problems that the processing cost of the ceramic structural member is high and the production efficiency is low.
In one aspect, the present application provides a method for preparing a ceramic structural member, comprising the steps of:
obtaining a shaping mold, wherein the shaping mold is provided with a shaping surface, and the shaping surface comprises a curved surface;
obtaining a ceramic body, and placing the ceramic body on the plastic surface;
heating the ceramic body to soften the ceramic body; and
and bending the softened ceramic blank under the action of air pressure difference and adsorbing the ceramic blank on the curved surface.
In one embodiment, the shaping surface comprises a plane surface, and the curved surface is connected with the edge of the plane surface; in the step of placing the ceramic blank on the molding surface, the ceramic blank is attached to the plane, and the edge of the ceramic blank is opposite to the curved surface; and in the step of bending the softened ceramic body under the action of the air pressure difference and adsorbing the softened ceramic body to the curved surface, bending the edge of the softened ceramic body under the action of the air pressure difference and adsorbing the edge to the curved surface.
In one embodiment, the shaping mold has an inner cavity, the shaping surface is provided with air holes communicated with the inner cavity, and the step of bending and adsorbing the softened ceramic blank on the curved surface under the action of air pressure difference specifically comprises:
and vacuumizing the inner cavity to enable the softened ceramic body to bend under the adsorption action of the air holes and be adsorbed on the curved surface.
In one embodiment, the obtaining of the ceramic body includes the following steps:
mixing ceramic raw material powder with a dispersing agent and a binder to obtain ceramic slurry;
the ceramic slurry is subjected to tape casting and punch forming to obtain a ceramic green body;
carrying out glue removal and degreasing on the ceramic green body to remove organic components;
sintering the ceramic green body after the binder removal and degreasing, wherein the sintering temperature is 1300-1550 ℃, and obtaining a ceramic sintered body;
and carrying out CNC machining on the ceramic sintered blank to obtain the ceramic blank body.
In one embodiment, the step of mixing the ceramic raw material powder with the dispersant and the binder to obtain the ceramic slurry specifically includes:
mixing white ceramic raw material powder with a dispersing agent and a binder to obtain white ceramic slurry, wherein the white ceramic raw material powder comprises the following components in percentage by mass: 0-0.25% of alumina, 1-5% of yttrium oxide and the balance of zirconium oxide containing hafnium oxide.
In one embodiment, the step of mixing the ceramic raw material powder with the dispersant and the binder to obtain the ceramic slurry specifically includes:
mixing color ceramic raw material powder with a dispersing agent and a binder to obtain color ceramic slurry, wherein the color ceramic raw material powder comprises the following components in percentage by mass: 90-99% of zirconium oxide, 1-5% of yttrium oxide, 0.1-3% of aluminum oxide and 0.8-8% of colorant.
In one embodiment, in the step of performing CNC machining on the ceramic sintered blank to obtain the ceramic green body, performing CNC machining on corners of the ceramic sintered blank and forming notches; and in the step of bending the softened ceramic body under the action of the air pressure difference and adsorbing the softened ceramic body to the curved surface, bending the edge of the softened ceramic body under the action of the air pressure difference and adsorbing the edge to the curved surface.
In one embodiment, after the step of bending and adhering the softened ceramic green body to the curved surface under the action of the air pressure difference, the bent edge margin of the ceramic sintered body is subjected to CNC cutting processing to eliminate the notch.
In one embodiment, after the step of placing the ceramic body on the molding surface and before the step of heating the ceramic body, the method for preparing the ceramic structural member further comprises the following steps:
and obtaining a limiting die, wherein the limiting die is provided with a containing groove, the shape of the groove surface of the containing groove is the same as that of the molding surface, the groove surface of the containing groove is opposite to the molding surface, and the ceramic blank is contained in the containing groove.
In one embodiment, one of the limiting mold and the shaping mold is provided with a protrusion, and the other is provided with a positioning groove, and in the step of making the groove surface of the accommodating groove opposite to the shaping surface, the protrusion is embedded in the positioning groove.
In one embodiment, the shaping mold and the limiting mold are made of graphite or at least one of alumina, silicon nitride, boron nitride and boron carbide; and in the step of heating the ceramic body to soften the ceramic body, the shaping die, the limiting die and the ceramic body are placed in an inert atmosphere to be heated.
In another aspect, the present application provides a ceramic structural member prepared by the above-described preparation method.
In yet another aspect, the present application provides an electronic device comprising the ceramic structural member described above.
In one embodiment, the ceramic structural component includes one of a middle frame, a rear cover and a key, or the ceramic structural component is an integrally formed structure of the middle frame and the rear cover.
The preparation method of the ceramic structural part, the ceramic structural part and the electronic equipment can bring the following beneficial effects: the ceramic body after being heated and softened can be directly hot-bent under the effect of atmospheric pressure difference and be the required curved surface shape, obtains the curved surface ceramic structure spare of required shape promptly, and relative ratio passes through CNC processing ceramic body and obtains curved surface ceramic structure spare, and too much machining allowance need not be reserved to this application ceramic body before hot-bent shaping, can greatly reduce the processing cost and improve production efficiency. In addition, in the related technology, the ceramic blank softened by heating is hot-pressed by the mold, however, the ceramic blank generates mold marks when being extruded by the mold, and the mold marks are difficult to remove by polishing when the mold marks are serious, and the ceramic blank softened by heating is bent by adopting an air pressure difference mode, so that the mold marks generated on the surface of the ceramic blank can be avoided or reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating steps of a method for manufacturing a ceramic structural component according to an exemplary embodiment;
FIG. 2 is a schematic flow chart illustrating steps of a method for manufacturing a ceramic structural component according to an exemplary embodiment;
FIG. 3 is a schematic flow chart illustrating steps of a method for manufacturing a ceramic body according to an exemplary embodiment;
FIG. 4 is a schematic structural diagram of a ceramic body placed in a shaping mold and a limiting mold according to an embodiment;
FIG. 5 is a schematic structural view of the ceramic body of FIG. 4;
FIG. 6 is a schematic view of the configuration of the shaping mold of FIG. 4 with the inner cavity evacuated and the ceramic body bent;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As used herein, "electronic device" means a device capable of receiving and/or transmitting communication signals including, but not limited to, a device connected via any one or more of the following connections:
(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;
(2) via a Wireless interface means such as a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter.
Electronic devices arranged to communicate over a wireless interface may be referred to as "mobile terminals". Examples of mobile terminals include, but are not limited to, the following electronic devices:
(1) satellite or cellular telephones;
(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;
(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;
(4) conventional laptop and/or palmtop receivers;
(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.
In one aspect of the present application, a method for manufacturing a ceramic structural member 100 is provided, as shown in fig. 1 to 3, including the following steps:
in step S21, the shaping mold 200 is obtained. Referring to fig. 4, the shaping mold 200 has a shaping surface 210. In one embodiment, the shaping surface 210 includes a flat surface 211 and a curved surface 212, and the curved surface 212 is smoothly connected with the edge of the flat surface 211. It is understood that in other embodiments, the shaping surface 210 may be a complete curved surface.
In one embodiment, the shaping mold 200 has an inner cavity 201, the shaping surface 210 is provided with a plurality of air holes 2101 communicated with the inner cavity 201, and the air holes 2101 are uniformly distributed on the curved surface 212 of the shaping surface 210. It is understood that in other embodiments, the air holes 2101 may also be evenly distributed in the plane 211 of the shaping surface 210. Wherein, the inner cavity 201 can be communicated with an external vacuum pumping device (such as a vacuum pump) through the pumping channel 202.
In an embodiment, the shaping mold 200 may be made of a material having a thermal expansion coefficient close to that of the ceramic blank 300, for example, the shaping mold 200 may be made of graphite having high temperature resistance, and the shaping mold 200 may also be made of at least one of alumina, silicon nitride, boron nitride, and boron carbide. In addition, the porosity of the molding surface 210 of the molding die 200 may be 12% to 18%.
In step S22, a ceramic blank 300 is obtained, where the ceramic blank 300 may be a flat panel, and the ceramic blank 300 may also be a curved panel that needs to be further processed, which is not limited herein. The ceramic body 300 is placed on the molding surface 210. In one embodiment, the ceramic body 300 is attached to the flat surface 211 of the shaping surface 210, and the edge of the ceramic body 300 is opposite to the curved surface 212 of the shaping surface 210. In one embodiment, when the shaping surface 210 is a complete curved surface, the ceramic body 300 is fixed to the curved surface 210.
In an embodiment, the step of obtaining the ceramic body 100 may comprise the steps of:
step S221, mixing the ceramic raw material powder with a dispersing agent and a binder to obtain ceramic slurry. The mixing process can be carried out in a ball mill, the ball milling temperature is controlled below 30 ℃, and the ball milling time is controlled within 45h-58 h.
In one embodiment, the ceramic raw material powder is a white ceramic raw material powder, and the white ceramic raw material powder is mixed with a dispersant and a binder to obtain a white ceramic slurry. The white ceramic raw material powder comprises the following components in percentage by mass: 0-0.25% of aluminum oxide, 1-5% of yttrium oxide, and the balance of zirconium oxide containing hafnium oxide and other trace impurities. The dispersant comprises at least one of polyacrylic acid, polyethylene glycol and glycerol. The binder comprises at least one of polyvinyl butyral (PVB), dioctyl phthalate (DOP), dibutyl phthalate (DBP). In one embodiment, the white ceramic raw material powder may have a particle size of 0.0001mm to 0.02mm, and the mass ratio of the white ceramic raw material powder to the dispersant and the binder is 50:3: 1.
In one embodiment, the ceramic raw material powder is a color ceramic raw material powder, and the color ceramic raw material powder is mixed with a dispersant and a binder to obtain a color ceramic slurry. The color ceramic raw material powder comprises the following components in percentage by mass: 90-99% of zirconium oxide, 1-5% of yttrium oxide, 0.1-3% of aluminum oxide and 0.8-8% of colorant. The colorant is used for coloring white zirconia, and may include one or more of erbium oxide, neodymium oxide, praseodymium oxide, cerium oxide, ferric oxide, chromium oxide, manganese oxide, zinc oxide, magnesium, silicon, calcium, cobalt, nickel, copper, vanadium, cadmium, tin, and the like. The dispersant comprises at least one of polyacrylic acid, polyethylene glycol and glycerol. The binder comprises at least one of polyvinyl butyral (PVB), dioctyl phthalate (DOP), dibutyl phthalate (DBP). In one embodiment, the particle size of the color ceramic raw material powder may be 0.0001mm to 0.02mm, and the mass ratio of the color ceramic raw material powder to the dispersant and the binder is 50:3: 1.
And step S222, carrying out tape casting and punch forming on the ceramic slurry obtained by mixing to obtain a ceramic green body.
The ceramic slurry obtained by mixing needs to be subjected to vacuum defoaming treatment before tape casting, the vacuum defoaming process can be carried out in a vacuum sealed stirring tank, and the following operation parameters can be selected in the process of carrying out vacuum defoaming on the ceramic slurry: the vacuum degree is minus 0.1MPa to minus 0.9MPa, the stirring speed is 80r/min to 120r/min, and the stirring time is 15min to 30 min. And after the vacuum defoaming is finished, placing the ceramic slurry subjected to defoaming in a casting machine for casting. The casting blank with the thickness of 0.2mm-1.2mm can be prepared by adjusting the casting process parameters.
To obtain the ceramic green body, the cast green body obtained can be placed in a stamping die for stamping forming, also known within the stamping forming industry as cutting, the purpose of stamping forming/cutting being to prepare a ceramic green body of suitable dimensions to match the use of lamination and isostatic pressing. The cutting machine used in the process is a device for cutting the dried casting green sheet, and the size of the cut piece can be determined according to the size of the ceramic structural member 100 to be prepared and the sintering shrinkage rate of the subsequent ceramic green body during sintering.
Step S223, performing degumming and degreasing on the ceramic green body to remove organic components. In one embodiment, the degumming temperature is controlled to be 300-900 ℃, the time is controlled to be 0.5-4h, and after degumming, a sample has no problems of distortion, cracking, heterochromous and the like.
And S224, sintering the ceramic green body after the binder removal and degreasing, wherein the sintering temperature is 1300-1550 ℃, and obtaining a ceramic sintered body. Wherein the ceramic green body may be sintered in a reducing or oxidizing or inert atmosphere.
And step S225, performing CNC machining on the ceramic sintered blank to obtain a ceramic blank body 300. In one embodiment, taking the preparation of a ceramic green body with a uniform thickness of 0.3mm as an example, the thickness of the prepared ceramic sintered body needs to be controlled to be 0.4mm, and the surplus 0.1mm allowance can be cut off by grinding through CNC machining.
In an embodiment, during the CNC processing of the ceramic sintered blank, referring to fig. 5, the corners of the ceramic sintered blank are CNC-processed and the notches 301 are formed, so as to obtain the ceramic green body 300 having the notches 301, and the shape and size of the notches 301 are not limited herein. In one embodiment, the depth of the notch 301 can be controlled to be 0.1mm to 1.5mm, and the depth can be understood as the distance from the edge of the ceramic body 300 to the inner side of the ceramic body 300. So, the setting of breach 301 can avoid follow-up ceramic body 300 to produce the risk of fold and warpage in the corner in-process of carrying out the hot bending, promotes ceramic body 300 hot bending yields.
In step S23, the limit mold 400 is acquired. Referring to fig. 4, the position-limiting mold 400 is provided with a receiving groove 410, and a groove surface 411 of the receiving groove 410 has the same shape as the molding surface 210. The groove surface 411 of the accommodating groove 410 is opposite to the molding surface 210, and the ceramic blank 300 is accommodated in the accommodating groove 410. In an embodiment, one of the limiting mold 400 and the shaping mold 200 is provided with a protrusion 203, and the other is provided with a positioning groove 403, so that the protrusion 203 is embedded in the positioning groove 410 in the step of making the groove surface 411 of the accommodating groove 410 opposite to the shaping surface 210. It should be noted that, in the subsequent hot bending process of the ceramic green body 300, the limiting mold 400 does not actually contact with the ceramic green body 300, and the limiting mold 400 only limits the ceramic green body 300 in the hot bending process, so as to prevent the ceramic green body 300 from separating from the molding surface 210.
In an embodiment, the shaping mold 200 may be made of a material having a thermal expansion coefficient close to that of the ceramic blank 300, for example, the shaping mold 200 may be made of graphite having high temperature resistance, and the shaping mold 200 may be made of at least one of alumina, silicon nitride, boron nitride, and boron carbide. It is understood that in other embodiments, step S23 may be omitted.
Step S24, the ceramic body 300 is heated to soften the ceramic body 300. In one embodiment, the shaping mold 200, the limiting mold 400, and the ceramic body 300 are heated in an inert atmosphere. For example, the heating time can be controlled to increase the temperature to 1450 ℃ for 6h, and the temperature can be maintained for 10h, and then the temperature can be reduced and cooled for 14 h.
Step S25, referring to fig. 6, the softened ceramic blank 300 is bent under the action of the air pressure difference and is adsorbed on the curved surface 212 of the shaping surface 210, so as to prepare the ceramic structural member 100 with the desired curved surface shape, and the shape of the shaping surface 210 is adapted to the curved shape of the ceramic structural member 100 to be prepared. In one embodiment, the edges of the softened ceramic body 300 are bent under the action of the air pressure difference and attached to the curved surface 212 of the shaping surface 210. For example, a vacuum may be applied to the inner cavity 201 of the shaping mold 200, so that the softened ceramic body 300 is bent by the suction of the air holes 2101 and is sucked to the curved surface 212. The gas flow direction during the vacuum-pumping process can refer to the direction indicated by the dotted arrow in fig. 6, and the following parameters need to be controlled during the vacuum-pumping process: the vacuum pumping time is 60-90 s, and the vacuum degree is 0.01-0.1 Mpa. In other embodiments, the edge of the ceramic body 300 can be bent and attached to the curved surface 212 of the shaping surface 210 by increasing the air pressure on the side of the ceramic body 300 away from the shaping mold 200.
In step S25, since the pressure difference is formed on the upper and lower surfaces of the ceramic body 300, the ceramic body 300 in a high temperature state can conform to the molding surface 210 of the molding die 200 and be molded into a desired shape, and the limiting die 400 mainly plays a limiting role, and since the limiting die 400 is not subjected to external pressure during the molding process, the die impression generated by limiting the shape of the ceramic body 300 by the limiting die 400 during the molding process is light, thereby solving the problem that the die impression generated on the surface of the ceramic body 300 by the related art through the hot press molding is difficult to polish and remove.
In one embodiment, after the step of bending and adhering the softened ceramic body 300 to the curved surface 212 by the air pressure difference, the edge margin of the bent ceramic body 300 is subjected to CNC cutting to eliminate the notch 301 (for example, a whole circle of the edge of the ceramic body 300 including the notch 301 may be cut off, and another part of the edge of the ceramic body 300 after bending is remained), so as to obtain the ceramic structural member 100 with the desired curved surface shape. The ceramic structural member 100 obtained after the notch 301 is eliminated can continue to be subjected to subsequent processing processes, such as polishing, PVD plating of a Log mark, and the like, so as to meet the use requirement of appearance.
In the preparation method of the ceramic structural member 100 of the present application, the ceramic blank 300 softened by heating can be directly hot-bent into a required curved surface shape under the action of the air pressure difference, i.e. the curved surface ceramic structural member 100 of the required shape is obtained, compared with the curved surface ceramic structural member obtained by processing the ceramic blank through CNC, the ceramic blank 300 of the present application does not need to reserve excessive processing allowance before hot-bending forming, and can greatly reduce the processing cost and improve the production efficiency. In addition, in the related art, the ceramic blank softened by heating is hot-pressed by a mold, however, the ceramic blank generates mold marks when being extruded by the mold, and the mold marks are difficult to remove by polishing when the mold marks are serious, and the risk of generating the mold marks on the surface of the ceramic blank 300 can be avoided or reduced by bending the ceramic blank 300 softened by heating in an air pressure difference mode.
In yet another aspect of the present application, a ceramic structural member 10 is provided that is produced using the foregoing method of producing a ceramic structural member 10. Accordingly, the ceramic structural member 10 has all of the features and advantages of the ceramic structural member 10 prepared by the foregoing method for preparing the ceramic structural member 10, and thus, the description thereof will not be repeated.
In another aspect of the present application, an electronic device 10 is provided, as shown in fig. 7, where the electronic device 10 includes the ceramic structural component 100, and the ceramic structural component 100 is a middle frame of the electronic device 10. In other embodiments, the ceramic structural member 100 may further include one of a rear cover and a key. The ceramic structural member 100 may also be a ceramic center frame and a ceramic back cover integrally formed structure. Of course, the ceramic structural member 100 may also be other components of the electronic device 10, and the structural form of the ceramic structural member 100 will not be described herein.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. A method for preparing a ceramic structural member, comprising the steps of:
obtaining a shaping mold, wherein the shaping mold is provided with a shaping surface, and the shaping surface comprises a curved surface;
obtaining a ceramic body, and placing the ceramic body on the plastic surface;
heating the ceramic body to soften the ceramic body; and
and bending the softened ceramic blank under the action of air pressure difference and adsorbing the ceramic blank on the curved surface.
2. The method of making a ceramic structural member according to claim 1, wherein the contoured surface comprises a flat surface, the curved surface being connected to an edge of the flat surface; in the step of placing the ceramic blank on the molding surface, the ceramic blank is attached to the plane, and the edge of the ceramic blank is opposite to the curved surface; and in the step of bending the softened ceramic body under the action of the air pressure difference and adsorbing the softened ceramic body to the curved surface, bending the edge of the softened ceramic body under the action of the air pressure difference and adsorbing the edge to the curved surface.
3. The method for preparing a ceramic structural member according to claim 1, wherein the shaping mold has an inner cavity, the shaping surface has air holes communicated with the inner cavity, and the step of bending and adhering the softened ceramic blank to the curved surface under the action of air pressure difference comprises:
and vacuumizing the inner cavity to enable the softened ceramic body to bend under the adsorption action of the air holes and be adsorbed on the curved surface.
4. The method of making a ceramic structural member according to claim 1, wherein said obtaining a ceramic body comprises the steps of:
mixing ceramic raw material powder with a dispersing agent and a binder to obtain ceramic slurry;
the ceramic slurry is subjected to tape casting and punch forming to obtain a ceramic green body;
carrying out glue removal and degreasing on the ceramic green body to remove organic components;
sintering the ceramic green body after the binder removal and degreasing, wherein the sintering temperature is 1300-1550 ℃, and obtaining a ceramic sintered body;
and carrying out CNC machining on the ceramic sintered blank to obtain the ceramic blank body.
5. The method for preparing a ceramic structural member according to claim 4, wherein the step of mixing ceramic raw material powder with a dispersant and a binder to obtain ceramic slurry comprises:
mixing white ceramic raw material powder with a dispersing agent and a binder to obtain white ceramic slurry, wherein the white ceramic raw material powder comprises the following components in percentage by mass: 0-0.25% of alumina, 1-5% of yttrium oxide and the balance of zirconium oxide containing hafnium oxide.
6. The method for preparing a ceramic structural member according to claim 4, wherein the step of mixing ceramic raw material powder with a dispersant and a binder to obtain ceramic slurry comprises:
mixing color ceramic raw material powder with a dispersing agent and a binder to obtain color ceramic slurry, wherein the color ceramic raw material powder comprises the following components in percentage by mass: 90-99% of zirconium oxide, 1-5% of yttrium oxide, 0.1-3% of aluminum oxide and 0.8-8% of colorant.
7. The method of manufacturing a ceramic structural member as recited in claim 4, wherein in the step of CNC-processing the ceramic sintered compact to obtain the ceramic green body, CNC-processing corners of the ceramic sintered compact and forming notches are performed; and in the step of bending the softened ceramic body under the action of the air pressure difference and adsorbing the softened ceramic body to the curved surface, bending the edge of the softened ceramic body under the action of the air pressure difference and adsorbing the edge to the curved surface.
8. The method for manufacturing a ceramic structural member as set forth in claim 7, wherein after the step of bending and adhering the softened ceramic green body to the curved surface by a difference in gas pressure, the bent edge margin of the ceramic sintered compact is subjected to CNC cutting to eliminate the gap.
9. The method of manufacturing a ceramic structural member as claimed in claim 1, wherein after the step of placing the ceramic green body on the molding surface and before the step of heating the ceramic green body, the method of manufacturing a ceramic structural member further comprises the steps of:
and obtaining a limiting die, wherein the limiting die is provided with a containing groove, the shape of the groove surface of the containing groove is the same as that of the molding surface, the groove surface of the containing groove is opposite to the molding surface, and the ceramic blank is contained in the containing groove.
10. The method according to claim 9, wherein one of the limiting mold and the shaping mold is provided with a protrusion, and the other one of the limiting mold and the shaping mold is provided with a positioning groove, and the protrusion is embedded in the positioning groove in the step of opposing the groove surface of the accommodating groove to the shaping surface.
11. The method of claim 9, wherein the shaping mold and the limiting mold are made of graphite or at least one of alumina, silicon nitride, boron nitride and boron carbide; and in the step of heating the ceramic body to soften the ceramic body, the shaping die, the limiting die and the ceramic body are placed in an inert atmosphere to be heated.
12. A ceramic structural member produced by the method for producing a ceramic structural member according to any one of claims 1 to 11.
13. An electronic device comprising the ceramic structural member according to claim 12.
14. The electronic device of claim 13, wherein the ceramic structural component comprises one of a middle frame, a rear cover and a key, or the ceramic structural component is an integrally formed structure of the middle frame and the rear cover.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910965071.8A CN110757630A (en) | 2019-10-11 | 2019-10-11 | Preparation method of ceramic structural member, ceramic structural member and electronic equipment |
| PCT/CN2020/115742 WO2021068722A1 (en) | 2019-10-11 | 2020-09-17 | Preparation method for ceramic structure, ceramic structure and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910965071.8A CN110757630A (en) | 2019-10-11 | 2019-10-11 | Preparation method of ceramic structural member, ceramic structural member and electronic equipment |
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| CN110757630A true CN110757630A (en) | 2020-02-07 |
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| WO (1) | WO2021068722A1 (en) |
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| WO2021068722A1 (en) * | 2019-10-11 | 2021-04-15 | Oppo广东移动通信有限公司 | Preparation method for ceramic structure, ceramic structure and electronic device |
| CN113912401A (en) * | 2020-07-07 | 2022-01-11 | Oppo广东移动通信有限公司 | Method for preparing shell, shell and electronic equipment |
| CN113979722A (en) * | 2021-11-25 | 2022-01-28 | 东莞市唯美陶瓷工业园有限公司 | Ceramic blank and ceramic curved rock plate |
| CN114477960A (en) * | 2020-10-23 | 2022-05-13 | Oppo广东移动通信有限公司 | Shell, manufacturing method thereof and electronic equipment |
| CN114770716A (en) * | 2022-05-13 | 2022-07-22 | 深圳市鑫陶窑炉设备有限公司 | Feeding machine for ceramic green blank and processing method |
| CN117283680A (en) * | 2023-11-27 | 2023-12-26 | 山东硅元新型材料股份有限公司 | Overlength ceramic guide rail, preparation process thereof and application thereof in photoetching machine |
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Also Published As
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| WO2021068722A1 (en) | 2021-04-15 |
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Application publication date: 20200207 |