CN106986631A - A kind of ceramic mobile phone shell and preparation method thereof - Google Patents
A kind of ceramic mobile phone shell and preparation method thereof Download PDFInfo
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- CN106986631A CN106986631A CN201710213354.8A CN201710213354A CN106986631A CN 106986631 A CN106986631 A CN 106986631A CN 201710213354 A CN201710213354 A CN 201710213354A CN 106986631 A CN106986631 A CN 106986631A
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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
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
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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
- C04B35/10—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 aluminium oxide
-
- 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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
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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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/6342—Polyvinylacetals, e.g. polyvinylbutyral [PVB]
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- 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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/638—Removal thereof
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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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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/94—Products characterised by their shape
- C04B2235/945—Products containing grooves, cuts, recesses or protusions
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- 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
Abstract
The invention discloses a kind of preparation method of ceramic mobile phone shell, including：（1）Sub-micron ceramic powder, dispersant, binding agent and plasticizer are dissolved in organic solvent, and carry out ball milling mixing, uniform slurry is formed；（2）Slurry is subjected to vacuum defoamation and flow casting molding processing, tape casting diaphragm is obtained；（3）According to shape of product and size design mould, by the differential diaphragm that tape casting diaphragm differential is respective shapes and size, and differential diaphragm on mould lamination, then handled by vacuum packaging sealing and isostatic pressed, obtain green compact；（4）Green compact are sintered by dumping, obtain the potsherd with preset shape and size；（5）Potsherd is passed through into grinding and polishing, ceramic mobile phone shell is obtained.Accordingly, invention additionally discloses one kind using ceramic mobile phone shell made from the above method.Using the present invention, the rear end processing capacity of the preparation method is few, increases substantially production efficiency and reduction product cost.
Description
Technical field
The present invention relates to cell phone appearance field, more particularly to a kind of ceramic mobile phone shell and preparation method thereof.
Background technology
Phone housing is as important structural member, it is necessary to possess that high-strength, wear-resisting, outward appearance is good, be electromagnetically shielded low feature.Mesh
Preceding is glass, engineering plastics and metal material mostly as phone housing.Glass material is frangible, not wear-resisting, easily scratch, engineering plastic
Expect that texture is poor, fade not environmentally, metal material hardness is low, it is more serious that electromagnetic signal is shielded.Ceramic material due to high intensity,
The excellent performance such as high rigidity, anti-oxidant, anticorrosive is more and more paid close attention to by people, especially as structures such as phone housings
Part, the transmission of electromagnetic signal is not influenceed.In addition ceramic texture is fine and smooth, and appearance glossiness is high, it is not easy to is scratched or weares and teares, it is ensured that
Mobile phone is persistently enjoyed as that newly, can obtain preferable visual experience and sense of touch.But ceramic materials fracture toughness is low, fragility is its cause greatly
The shortcoming of life, ceramic hardness is big in addition, and processing difficulties cause cost high, and how low cost prepares high tenacity ceramic package to ceramics
Application in fields such as phone housings has great importance.
Documents 1 disclose a kind of preparation method of zirconia ceramics phone housing, Application No. 201510399285.
The patent prepares casting films by flow casting molding, is then sintered by lamination, dumping, CNC, abrasive polishing process prepare ceramics
Need to carry out CNC processing after phone housing, but technique sintering, the production cycle is long, rear end is processed during the complicated shape such as shaping 3D
Difficulty, rear end high processing costs.Existing Normal practice is directly to do a phone housing block, passes through machining（CNC）, plus
Work goes out four sides arc, and because ceramic hardness is big, such processing cost is very high.Other normal pressure-sintered process time is longer, sintering temperature
Height is spent, causes crystal grain easily to be grown up, the fracture toughness reduction of final ceramics.
The content of the invention
The technical problems to be solved by the invention are to prepare high intensity, high tenacity, high rigidity there is provided a kind of low cost
The method of ceramic mobile phone shell, the rear end processing capacity of the preparation method is few, increases substantially production efficiency and reduction product cost.
The technical problems to be solved by the invention are also resided in there is provided one kind ceramic mobile phone shell as made from the above method,
The ceramic mobile phone shell has the advantages that high intensity, high tenacity, high rigidity.
To reach above-mentioned technique effect, the invention provides a kind of preparation method of ceramic mobile phone shell, including：
（1）Sub-micron ceramic powder, dispersant, binding agent and plasticizer are dissolved in organic solvent, and carry out ball milling mixing, shape
Into uniform slurry；
（2）By step（1）Slurry carry out vacuum defoamation and flow casting molding processing, obtain tape casting diaphragm, the tape casting diaphragm
Thickness is 0.1-1.0mm；
（3）According to shape of product and size design mould, by step（2）Obtained tape casting diaphragm differential is respective shapes and size
Differential diaphragm, and differential diaphragm on mould lamination, then by vacuum packaging sealing and isostatic pressed processing, obtain green compact；
（4）By step（3）Obtained green compact are sintered by dumping, obtain the potsherd with preset shape and size；
（5）By step（4）Obtained potsherd passes through grinding and polishing, obtains ceramic mobile phone shell.
As the improvement of such scheme, the mould includes the first mould and the second mould, and first mould is provided with convex
Platform, second mould is provided with groove, and the boss and groove are adapted；
It is used as the improvement of such scheme, step（3）Including：
According to shape of product and size design mould；
The micro- differential diaphragm for being cut into corresponding size and dimension of tape casting diaphragm, the differential diaphragm includes housing main body differential
Diaphragm and shell rim differential diaphragm；
At least one of releasing agent, silicone oil or PET carrier bands are sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
60-70 DEG C is warming up to, the differential diaphragm after lamination is put into vacuum packaging sealing unit and is incubated 5-15min, it is slow to add
Slow pressure release is depressed into after 80-150MPa, pressurize 1-3min, green compact are obtained after the demoulding.
As the improvement of such scheme, the sub-micron ceramic powder includes at least one of zirconium oxide, aluminum oxide, described
Zirconium oxide contains 1-8wt% yittrium oxide；The particle diameter of the sub-micron ceramic powder is 0.1-0.5 μm.
As the improvement of such scheme, the organic solvent is dimethylbenzene, 2- butanone, absolute ethyl alcohol, methanol, toluene, just
The mixed solvent of one or two kinds of compositions in butanol, normal propyl alcohol, isopropanol, n-hexane, the mass fraction of organic solvent is slurry
The 20-30wt% of gross mass；
The dispersant is at least one of BYK or phosphate, and the mass fraction of dispersant is the 0.1- of slurry gross mass
1.0wt%；
The binding agent is polyvinyl butyral resin, and the mass fraction of binding agent is the 5-10wt% of slurry gross mass；
The plasticizer is at least one of BBP(Butyl Benzyl Phthalate, dioctyl phthalate, plastic agent and binding agent
Amount ratio be 0.4-1.2.
As the improvement of such scheme, the solid content of the slurry is 55-65wt%.
It is used as the improvement of such scheme, step（2）The vacuum of middle slurry vacuum defoamation is 0.01-0.2MPa, during deaeration
Between be 2-15h.
It is used as the improvement of such scheme, step（4）Including：
Green compact are with 500-700 DEG C/1h dumpings in draft glue discharging furnace, and then the sintered heat insulating in high temperature sintering furnace, obtains potsherd；
Wherein, if sub-micron ceramic powder selects zirconium oxide, its sintering temperature is 1350-1500 DEG C, and soaking time is 1-2h；
If sub-micron ceramic powder selects aluminum oxide, its sintering temperature is 1600-1680 DEG C, and soaking time is 1-2h.
It is used as the improvement of such scheme, step（5）In, potsherd obtains the mobile phone of net shape by abrasive polishing process
Ceramic package, it is not necessary to pass through CNC manufacturing procedures, ceramic mobile phone outer casing thickness is 0.2-1.0mm.
Accordingly, the present invention also provides the ceramic mobile phone shell as made from any of the above-described preparation method.
Implement the present invention to have the advantages that：
The present invention is prepared for large-sized ceramic bonnet by normal pressure-sintered, is a kind of dead size forming technique, it is not necessary to which CNC adds
Work process, it is possible to which processing obtains the complicated shapes such as 2D, 2.5D and 3D, can meet the requirement of different size mobile phone.It utilizes micro-
Point lamination, has a clear superiority in terms of the thin sample of large scale is prepared, and can meet large-scale production, and rear end processing capacity is few and letter
It is single, production efficiency and reduction product cost can be increased substantially.Moreover, the ceramic mobile phone shell that the present invention is prepared has height
The features such as intensity, high tenacity, high rigidity.
Specifically, lamination of the present invention is in three steps, corresponding size and dimension is cut into tape casting diaphragm is micro- first
Differential diaphragm, differential diaphragm includes housing main body differential diaphragm and shell rim differential diaphragm；Secondly, by shell rim differential film
Piece is stacked on the boss of the first mould；Again, housing main body differential diaphragm is superimposed again in the top of shell rim differential diaphragm,
To reach the structure of frame and flat board integration.The present invention obtains accurate-size by micro- cutting and control sintering shrinkage
Shell rim, is that shaping below lays the foundation.Again by limiting the thickness of tape casting diaphragm, it is ensured that shell rim after isostatic pressed
It is integrated into a whole with housing main body, it is to avoid the lamination problem after lamination isostatic pressed.
Brief description of the drawings
Fig. 1 is the front view of inventive die；
Fig. 2 is the left view shown in Fig. 1；
Fig. 3 is the upward view shown in Fig. 1.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing and specific embodiment
The present invention is described in further detail.
The invention provides a kind of preparation method of ceramic mobile phone shell, including：
（1）Sub-micron ceramic powder, dispersant, binding agent and plasticizer are dissolved in organic solvent, and carry out ball milling mixing, shape
Into uniform slurry；
The sub-micron ceramic powder includes at least one of zirconium oxide, aluminum oxide, and the zirconium oxide contains 1-8wt% oxidation
Yttrium.The particle diameter of the sub-micron ceramic powder is 0.1-0.5 μm.It is preferred that, the zirconium oxide contains 2-5wt% yittrium oxide.
The particle diameter of sub-micron ceramic powder is 0.2-0.4 μm.Diameter of particle is arranged on 0.1-0.5 μm, be according to casting molding processes and
End properties is set after sintering.Diameter of particle is too thin, and casting slurry solid content is too low, cause sintering to be easily deformed,
Ftracture, burn the phenomenon generation such as not fine and close.Diameter of particle is too big, and the reduction of one side sintering activity is unfavorable for sintering；On the other hand burn
Crystallite dimension is excessive during knot, and ceramic fracture toughness, intensity can be reduced.
The aggregate of the present invention can be zirconia ceramics powder or alumina ceramic powder, can also be oxidation
The mixture of zircon ceramic powder and alumina ceramic powder.When the mixing that it is zirconia ceramics powder and alumina ceramic powder
During thing, the two can be mixed with arbitrary proportion.
The organic solvent be dimethylbenzene, 2- butanone, absolute ethyl alcohol, methanol, toluene, n-butanol, normal propyl alcohol, isopropanol,
The mixed solvent of one or two kinds of compositions in n-hexane, the mass fraction of organic solvent is the 20-30wt% of slurry gross mass.It is excellent
Choosing, the organic solvent is dimethylbenzene, the mixture of absolute ethyl alcohol, and the ratio of dimethylbenzene and absolute ethyl alcohol is 4:1.Or,
The organic solvent is 2- butanone, the mixture of absolute ethyl alcohol, and the ratio of 2- butanone and absolute ethyl alcohol is 3:2.
The dispersant is at least one of BYK or phosphate, and the mass fraction of dispersant is slurry gross mass
0.1-1.0wt%。
The binding agent is polyvinyl butyral resin, and the mass fraction of binding agent is the 5-10wt% of slurry gross mass.This hair
It is bright to select this binding agent, it is ensured that in casting molding processes, with good film forming.
The plasticizer is at least one of BBP(Butyl Benzyl Phthalate, dioctyl phthalate, and plastic agent is with gluing
The amount ratio for tying agent is 0.4-1.2.Plastic agent of the present invention is mainly used for softening binding agent, reduces the glass transition of binding agent
Temperature.It is preferable to the bating effect of selected binding agent from above-mentioned plastic agent.
The solid content of the slurry is 55-65wt%, and it is used to coordinate casting technique, it is ensured that the quality of tape casting diaphragm, makes it
Can be using differential as the differential diaphragm of respective shapes and size.If the solid content of slurry is more than 65wt%, or solid content is less than
55wt%, it cannot be guaranteed that tape casting diaphragm quality.
（2）By step（1）Slurry carry out vacuum defoamation and flow casting molding processing, obtain tape casting diaphragm, the casting films
The thickness of piece is 0.1-1.0mm.
Wherein, the vacuum of slurry vacuum defoamation is 0.01-0.2MPa, and inclined heated plate is 2-15h.
It is preferred that, the thickness of the tape casting diaphragm is 0.2-0.5mm, and the vacuum of slurry vacuum defoamation is 0.05-
0.15MPa, inclined heated plate is 3-6h.
（3）According to shape of product and size design mould, by step（2）Obtained tape casting diaphragm differential be respective shapes and
The differential diaphragm of size, and differential diaphragm on mould lamination, then by vacuum packaging sealing and isostatic pressed processing, given birth to
Base.
Wherein, as shown in Figure 1, 2, 3, the mould 1 includes the first mould 11 and the second mould 12, first mould 11
Provided with boss 13, second mould 12 is provided with groove 14, and the boss 13 and groove 14 are adapted.
Specifically, step（3）Including：
According to shape of product and size design mould；
The micro- differential diaphragm for being cut into corresponding size and dimension of tape casting diaphragm, the differential diaphragm includes housing main body differential
Diaphragm and shell rim differential diaphragm, housing main body differential diaphragm are generally flat board, and shell rim differential diaphragm can regard final
Depending on the shape of product, generally curved surface frame；
At least one of releasing agent, silicone oil or PET carrier bands are sprayed on mould；
On the boss 13 that shell rim differential diaphragm is stacked in the first mould 11, it is superimposed again above shell rim differential diaphragm
Housing main body differential diaphragm, then by the first mould 11 and the matched moulds of the second mould 12；
60-70 DEG C is warming up to, the differential diaphragm after lamination is put into vacuum packaging sealing unit and is incubated 5-15min, it is slow to add
Slow pressure release is depressed into after 80-150MPa, pressurize 1-3min, green compact are obtained after the demoulding.
It is preferred that, 62-68 DEG C is warming up to, the differential diaphragm after lamination is put into vacuum packaging sealing unit and is incubated 7-
12min, is slowly forced into after 90-130MPa, pressurize 1-2min slow pressure release, green compact is obtained after the demoulding.
（4）By step（3）Obtained green compact are sintered by dumping, obtain the potsherd with preset shape and size；
Specifically, by green compact in draft glue discharging furnace with 500-700 DEG C/1h dumpings, then the sintered heat insulating in high temperature sintering furnace, is obtained
Potsherd；Wherein, if sub-micron ceramic powder selects zirconium oxide, its sintering temperature is 1350-1500 DEG C, and soaking time is 1-
2h；If sub-micron ceramic powder selects aluminum oxide, its sintering temperature is 1600-1680 DEG C, and soaking time is 1-2h.
It is preferred that, by green compact in draft glue discharging furnace with 600 DEG C/1h dumpings, then the sintered heat insulating in high temperature sintering furnace, is obtained
Potsherd；Wherein, if sub-micron ceramic powder selects zirconium oxide, its sintering temperature is 1380-1450 DEG C, and soaking time is 1-
2h；If sub-micron ceramic powder selects aluminum oxide, its sintering temperature is 1620-1660 DEG C, and soaking time is 1-2h.
（5）By step（4）Obtained potsherd passes through grinding and polishing, obtains ceramic mobile phone shell.
Specifically, potsherd obtains the mobile phone ceramic package of net shape by abrasive polishing process, it is not necessary to pass through CNC
Manufacturing procedure, ceramic mobile phone outer casing thickness is 0.2-1.0mm.
The present invention is prepared for the ceramic bonnets of large-sized 3D by normal pressure-sintered, is a kind of dead size forming technique, is not required to
Want CNC manufacturing procedures.And existing Normal practice is directly to do a block, pass through machining（CNC）, process four sides
Arc, because ceramic hardness is big, such processing cost is very high and complex process.
The present invention is divided into from raw material, batch mixing, vacuum defoamation, flow casting molding, differential lamination, dumping sintering, grinding and polishing 7
Step, to realize that dead size is molded.Wherein, differential lamination is divided into three steps：1st, corresponding chi is cut into tape casting diaphragm is micro-
The differential diaphragm of very little and shape, differential diaphragm includes housing main body differential diaphragm and shell rim differential diaphragm；2nd, by shell side
Frame differential diaphragm is stacked on the boss of the first mould；3rd, housing main body differential is superimposed again in the top of shell rim differential diaphragm
Diaphragm, to reach the structure of frame and flat board integration.The difficult point of the present invention is：1st, the cutting process of frame portion, this must
Sintering shrinkage and cutting frame size must be controlled, follow-up lamination and the fit technique of sintering otherwise can be influenceed, cause the strong of product
Degree, toughness and hardness do not reach requirement；2nd, frame and main body integrated shaping rear demoulding are difficult or are easily deformed, solution
It is that at least one of releasing agent, silicone oil or PET carrier bands are sprayed in mold convexity part；3rd, easily it is layered after lamination isostatic pressed
（Especially frame portion and frame and main contact section）, solution is the thickness by strictly controlling tape casting diaphragm, with
The peaceful plate of frame is integrated into a whole after ensureing isostatic pressed.
Other steps of the present invention, are that differential lamination lays the foundation from raw material, batch mixing, vacuum defoamation, flow casting molding, and
Dumping sintering, grinding and polishing then further strengthen the quality of product.Above-mentioned steps complement each other, indispensable, can ensure pottery
Porcelain phone housing final finished has excellent performance, and density is 6.04-6.08g/cm3, fracture toughness ＞ 11.0MPa.m1/2,
Vickers hardness hv10＞ 13GPa, bending strength ＞ 1400MPa.
Accordingly, the present invention also provides the ceramic mobile phone shell as made from any of the above-described preparation method.The preparation method
Ins and outs it is same as above, will not be repeated here.
The present invention is expanded on further with specific embodiment below
Embodiment 1
（1）Slurry preparation：10kg Zirconium powders are taken to be dissolved in the in the mixed solvent of 5kg butanone and absolute ethyl alcohol, butanone and anhydrous
The mass ratio of ethanol is 3:2,80g BYK dispersants are added, then first ball milling 5h adds 825g binding agents and 536g plastic agents,
Binding agent is polyvinyl butyral resin, and plastic agent is dioctyl phthalate, and ball milling 24h is mixed into uniform slurry.
（2）Flow casting molding：By step（1）Slurry vacuum defoamation, vacuum is 0.1MPa, deaeration 15h, flow casting molding system
Standby 0.2mm casting films.
（3）Differential lamination：With reference to the die size and shape of figure one, by by step（2）In tape casting diaphragm differential be with
The diaphragm of die size and form fit, including housing main body differential diaphragm and shell rim differential diaphragm；
Releasing agent is sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
Vacuum packet, which is honored as a queen, is put into isostatic pressed in warm isostatic pressing machine, and isostatic pressed process is put into the base encapsulated to be first warming up to 60 DEG C
Body is incubated 10min, is slowly forced into after 150MPa, pressurize 2min slow pressure release, the green compact of shape needed for being obtained after the demoulding.
（4）Dumping is sintered：Green compact are put into 600 DEG C/1h dumpings in draft glue discharging furnace, are transferred to 1470 DEG C of insulations in sintering furnace
90min obtains potsherd.
（5）Machining：By step（4）In potsherd emery wheel corase grind fine grinding, polishing machine polishing after obtain the zirconium oxide
Ceramic mobile phone shell.
Embodiment 2：
（1）Slurry preparation：Take 10kg Zirconium powders to be dissolved in the in the mixed solvent of 5kg dimethylbenzene and absolute ethyl alcohol, dimethylbenzene and
The mass ratio of absolute ethyl alcohol is 4:1,80g BYK dispersants are added, then first ball milling 5h adds 825g binding agents and 742g modelings
Property agent, binding agent is polyvinyl butyral resin, and plastic agent is BBP(Butyl Benzyl Phthalate, and ball milling 24h is mixed into uniform slurry.
（2）Flow casting molding：By step（1）Slurry vacuum defoamation, vacuum is 0.1MPa, deaeration 15h, flow casting molding system
Standby 0.2mm casting films.
（3）Differential lamination：With reference to the die size and shape of figure one, by by step（2）In tape casting diaphragm differential be with
The diaphragm of die size and form fit, including housing main body differential diaphragm and shell rim differential diaphragm；
Silicone oil is sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
Vacuum packet, which is honored as a queen, is put into isostatic pressed in warm isostatic pressing machine, and isostatic pressed process is put into the base encapsulated to be first warming up to 60 DEG C
Body is incubated 10min, is slowly forced into after 150MPa, pressurize 2min slow pressure release, the green compact of shape needed for being obtained after the demoulding.
（4）Dumping is sintered：Green compact are put into 600 DEG C/1h dumpings in draft glue discharging furnace, are transferred to 1480 DEG C of insulations in sintering furnace
90min obtains potsherd.
（5）Machining：By step（4）In potsherd emery wheel corase grind fine grinding, polishing machine polishing after obtain the zirconium oxide
Ceramic mobile phone shell.
Embodiment 3：
（1）Slurry preparation：10kg alumina powders are taken to be dissolved in the in the mixed solvent of 4kg butanone and absolute ethyl alcohol, butanone and anhydrous
The mass ratio of ethanol is 3:2,90g phosphate dispersant is added, then first ball milling 5h adds 905g binding agents and 543g plasticity
Agent, binding agent is polyvinyl butyral resin, and plastic agent is dioctyl phthalate, and ball milling 24h is mixed into uniform slurry.
（2）Flow casting molding：By step（1）Slurry vacuum defoamation, vacuum is 0.1MPa, deaeration 15h, flow casting molding system
Standby 0.3mm casting films.
（3）Lamination is sintered with dumping：With reference to the die size and shape of figure one, by by step（2）In tape casting diaphragm it is micro-
It is divided into the diaphragm with die size and form fit, including housing main body differential diaphragm and shell rim differential diaphragm；
Releasing agent is sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
Vacuum packet, which is honored as a queen, is put into isostatic pressed in warm isostatic pressing machine, and isostatic pressed process is put into the base encapsulated to be first warming up to 60 DEG C
Body is incubated 10min, is slowly forced into after 150MPa, pressurize 2min slow pressure release, the green compact of shape needed for being obtained after the demoulding.
（4）Dumping is sintered：Green compact are put into 600 DEG C/1h dumpings in draft glue discharging furnace, are transferred to 1650 DEG C of insulation 2h in sintering furnace and obtain
To potsherd.
（5）Machining：By step（4）In potsherd emery wheel corase grind fine grinding, polishing machine polishing after obtain the aluminum oxide
Ceramic mobile phone shell.
Embodiment 4：
（1）Slurry preparation：10kg alumina powders are taken to be dissolved in the in the mixed solvent of 4kg butanone and absolute ethyl alcohol, butanone and anhydrous
The mass ratio of ethanol is 3:2,90g phosphate dispersant is added, then first ball milling 5h adds 905g binding agents and 815g plasticity
Agent, binding agent is polyvinyl butyral resin, and plastic agent is BBP(Butyl Benzyl Phthalate, and ball milling 24h is mixed into uniform slurry.
（2）Flow casting molding：By step（1）Slurry vacuum defoamation, vacuum is 0.1MPa, deaeration 15h, flow casting molding system
Standby 0.5mm casting films.
（3）Lamination is sintered with dumping：With reference to the die size and shape of figure one, by by step（2）In tape casting diaphragm it is micro-
It is divided into the diaphragm with die size and form fit, including housing main body differential diaphragm and shell rim differential diaphragm；
PET carrier bands are sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
Vacuum packet, which is honored as a queen, is put into isostatic pressed in warm isostatic pressing machine, and isostatic pressed process is put into the base encapsulated to be first warming up to 60 DEG C
Body is incubated 10min, is slowly forced into after 150MPa, pressurize 2min slow pressure release, the green compact of shape needed for being obtained after the demoulding.
（4）Dumping is sintered：Green compact are put into 600 DEG C/1h dumpings in draft glue discharging furnace, are transferred to 1680 DEG C of insulation 2h in sintering furnace and obtain
To potsherd.
（5）Machining：By step（4）In potsherd emery wheel corase grind fine grinding, polishing machine polishing after obtain the aluminum oxide
Ceramic mobile phone shell.
Ceramic mobile phone shell obtained by embodiment 1-4 is subjected to technology for detection, performance difference is as follows：
It should be noted that the density, intensity, hardness and fracture toughness are carried out using following method of testings：1st, the density
Measured using Archimedes's drainage；2nd, the intensity is using 4 bending resistance method measurements；3rd, the hardness uses Vickers
Measurement；4th, the fracture toughness is measured using indentation method.
In summary, the present invention is prepared for large-sized ceramic bonnet by normal pressure-sintered, is a kind of dead size shaping skill
Art, it is not necessary to CNC manufacturing procedures, it is possible to which processing obtains the complicated shapes such as 2D, 2.5D and 3D, can meet different size mobile phone
It is required that.It utilizes differential lamination, is had a clear superiority in terms of the thin sample of large scale is prepared, can meet large-scale production, and after
Hold processing capacity few and simple, production efficiency and reduction product cost can be increased substantially.Moreover, the ceramics that the present invention is prepared
The features such as phone housing has high intensity, high tenacity, high rigidity.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of preparation method of ceramic mobile phone shell, it is characterised in that including：
（1）Sub-micron ceramic powder, dispersant, binding agent and plasticizer are dissolved in organic solvent, and carry out ball milling mixing, shape
Into uniform slurry；
（2）By step（1）Slurry carry out vacuum defoamation and flow casting molding processing, obtain tape casting diaphragm, the tape casting diaphragm
Thickness is 0.1-1.0mm；
（3）According to shape of product and size design mould, by step（2）Obtained tape casting diaphragm differential is respective shapes and size
Differential diaphragm, and differential diaphragm on mould lamination, then by vacuum packaging sealing and isostatic pressed processing, obtain green compact；
（4）By step（3）Obtained green compact are sintered by dumping, obtain the potsherd with preset shape and size；
（5）By step（4）Obtained potsherd passes through grinding and polishing, obtains ceramic mobile phone shell.
2. the preparation method of ceramic mobile phone shell according to claim 1, it is characterised in that the mould includes the first mould
Tool and the second mould, first mould are provided with boss, and second mould is provided with groove, and the boss and groove are adapted.
3. the preparation method of ceramic mobile phone shell according to claim 2, it is characterised in that step（3）Including：
According to shape of product and size design mould；
The micro- differential diaphragm for being cut into corresponding size and dimension of tape casting diaphragm, the differential diaphragm includes housing main body differential
Diaphragm and shell rim differential diaphragm；
At least one of releasing agent, silicone oil or PET carrier bands are sprayed on mould；
Shell rim differential diaphragm is stacked on the boss of the first mould, shell is superimposed again above shell rim differential diaphragm
Main body differential diaphragm, then by the first mould and the second mould matched moulds；
60-70 DEG C is warming up to, the differential diaphragm after lamination is put into vacuum packaging sealing unit and is incubated 5-15min, it is slow to add
Slow pressure release is depressed into after 80-150MPa, pressurize 1-3min, green compact are obtained after the demoulding.
4. the preparation method of ceramic mobile phone shell as claimed in claim 1, it is characterised in that the sub-micron ceramic powder bag
Containing at least one of zirconium oxide, aluminum oxide, the zirconium oxide contains 1-8wt% yittrium oxide；The grain of the sub-micron ceramic powder
Footpath is 0.1-0.5 μm.
5. the preparation method of ceramic mobile phone shell as claimed in claim 1, it is characterised in that the organic solvent is diformazan
One or two kinds of compositions is mixed in benzene, 2- butanone, absolute ethyl alcohol, methanol, toluene, n-butanol, normal propyl alcohol, isopropanol, n-hexane
Bonding solvent, the mass fraction of organic solvent is the 20-30wt% of slurry gross mass；
The dispersant is at least one of BYK or phosphate, and the mass fraction of dispersant is the 0.1- of slurry gross mass
1.0wt%；
The binding agent is polyvinyl butyral resin, and the mass fraction of binding agent is the 5-10wt% of slurry gross mass；
The plasticizer is at least one of BBP(Butyl Benzyl Phthalate, dioctyl phthalate, plastic agent and binding agent
Amount ratio be 0.4-1.2.
6. the preparation method of ceramic mobile phone shell according to claim 1, it is characterised in that the solid content of the slurry is
55-65wt%。
7. the preparation method of ceramic mobile phone shell according to claim 1, it is characterised in that step（2）Middle slurry vacuum
The vacuum of deaeration is 0.01-0.2MPa, and inclined heated plate is 2-15h.
8. the preparation method of ceramic mobile phone shell according to claim 1, it is characterised in that step（4）Including：
Green compact are with 500-700 DEG C/1h dumpings in draft glue discharging furnace, and then the sintered heat insulating in high temperature sintering furnace, obtains potsherd；
Wherein, if sub-micron ceramic powder selects zirconium oxide, its sintering temperature is 1350-1500 DEG C, and soaking time is 1-2h；
If sub-micron ceramic powder selects aluminum oxide, its sintering temperature is 1600-1680 DEG C, and soaking time is 1-2h.
9. the preparation method of ceramic mobile phone shell according to claim 1, it is characterised in that step（5）In, potsherd warp
Cross the mobile phone ceramic package that abrasive polishing process obtains net shape, it is not necessary to pass through CNC manufacturing procedures, ceramic mobile phone shell is thick
Spend for 0.2-1.0mm.
10. ceramic mobile phone shell prepared by a kind of preparation method as any one of claim 1 to 9.
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| CN108032409A (en) * | 2017-12-06 | 2018-05-15 | 广东百工新材料科技有限公司 | A kind of mould suitable for tape casting mobile phone battery cover |
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| CN108032409A (en) * | 2017-12-06 | 2018-05-15 | 广东百工新材料科技有限公司 | A kind of mould suitable for tape casting mobile phone battery cover |
| CN108439997A (en) * | 2018-05-11 | 2018-08-24 | 东莞信柏结构陶瓷股份有限公司 | The preparation method and its product of polychrome ceramics |
| CN108675812A (en) * | 2018-06-21 | 2018-10-19 | 河北工业大学 | A kind of reinforced alumina ceramic mobile phone backboard and preparation method thereof |
| CN108675812B (en) * | 2018-06-21 | 2021-04-20 | 河北工业大学 | Toughened alumina ceramic mobile phone backboard and preparation method thereof |
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| CN110563461A (en) * | 2019-10-11 | 2019-12-13 | 东莞市陶陶新材料科技有限公司 | preparation method of ceramic composite with high impact resistance |
| CN110563461B (en) * | 2019-10-11 | 2022-05-31 | 东莞市陶陶新材料科技有限公司 | Preparation method of ceramic composite with high impact resistance |
| CN111116234A (en) * | 2019-12-31 | 2020-05-08 | 中电国基南方集团有限公司 | Side printing method of high-temperature co-fired ceramic green ceramic frame |
| CN111116234B (en) * | 2019-12-31 | 2021-10-26 | 中电国基南方集团有限公司 | Side printing method of high-temperature co-fired ceramic green ceramic frame |
| CN111367028A (en) * | 2020-03-12 | 2020-07-03 | 河北中瓷电子科技股份有限公司 | TOSA/ROSA shell with full ceramic structure and preparation method thereof |
| CN111367028B (en) * | 2020-03-12 | 2021-09-07 | 河北中瓷电子科技股份有限公司 | TOSA/ROSA shell with full ceramic structure and preparation method thereof |
| CN112028638A (en) * | 2020-07-31 | 2020-12-04 | 深圳陶陶科技有限公司 | Ceramic material and preparation method and application thereof |
| CN111807836A (en) * | 2020-09-09 | 2020-10-23 | 蓝思科技股份有限公司 | Ceramic rear cover and preparation method thereof |
| CN112876245A (en) * | 2021-01-28 | 2021-06-01 | 深圳陶陶科技有限公司 | Preparation method of zirconia ceramic |
| CN113473781A (en) * | 2021-07-27 | 2021-10-01 | Oppo广东移动通信有限公司 | Shell assembly, preparation method thereof and electronic equipment |
| CN114538900A (en) * | 2022-02-16 | 2022-05-27 | 中国科学院上海硅酸盐研究所 | High-purity ultrathin high-strength alumina ceramic substrate and preparation method and application thereof |
| CN114702315A (en) * | 2022-04-12 | 2022-07-05 | 东莞信柏结构陶瓷股份有限公司 | Hot-bending ceramic and preparation method thereof |
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