CN105430125A - Functional mobile phone back shell and preparation method thereof - Google Patents
Functional mobile phone back shell and preparation method thereof Download PDFInfo
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- CN105430125A CN105430125A CN201510777195.5A CN201510777195A CN105430125A CN 105430125 A CN105430125 A CN 105430125A CN 201510777195 A CN201510777195 A CN 201510777195A CN 105430125 A CN105430125 A CN 105430125A
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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
- H04M1/0279—Improving the user comfort or ergonomics
-
- 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
- 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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- 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
- H04M1/0279—Improving the user comfort or ergonomics
- H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Signal Processing (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Details Of Aerials (AREA)
Abstract
The present invention discloses a preparation method of a functional mobile phone back shell, comprising the following steps: (1) mixing and pulping raw materials required for the preparation of the mobile phone back shell, and preparing a ceramic tape-casting tablet by a tape-casting machine; (2) adding functional elements into the ceramic tape-casting tablet through printing or welding, wherein the functional elements comprise a circuit, a chip, an antenna and an NFC module; (3) laminating one or more ceramic tape-casting tablets added with the functional elements; (4) laminating and compressing the laminated ceramic tape-casting tablets; (5) conducting isostatic pressing processing on the laminated and compressed ceramic tape-casting tablets; (6) discharging rubber of the ceramic tape-casting tablets after isostatic pressing treatment; and (7) sintering the rubber-discharged ceramic tape-casting tablets to obtain a finished product. Accordingly, the present invention also discloses a mobile phone back shell obtained by the above-mentioned method. According to the present invention, the mobile phone back shell is multifunctional, realizes the transition from a traditional appearance element to the functional element, and can be used as a second main board of a mobile phone.
Description
Technical field
The present invention relates to mobile phone shell on the back field, particularly a kind of feature phone shell on the back and preparation method thereof.
Background technology
From initial first battlefield mobile phone 4G smart mobile phone till now, extend to the 5G epoch on the horizon, the function of mobile phone also becomes from strength to strength.In daily life, mobile phone institute role is except telephony feature, further comprises the more function such as PDA, game machine, MP3, photograph, recording, shooting, location.
While earth-shaking change occurs cell-phone function, corresponding mobile phone shell on the back is also carrying out synchronous renewal.From initial plastics, the materials such as plastics till now, glass, metal are also deposited, and the variation of mobile phone shell on the back meets the demand of different client.But the arrival in the demand growing along with people and 5G epoch, it is found that, existing shell on the back material can not meet demand far away, how to develop new material, and adds wherein by new technique, better serve masses, also just seem more crucial.Plastics have that cost is low, the advantage such as ease for use and plasticity, and technology maturation, but its thermal conductivity is low, texture is not good, the inferior defect that is difficult to perform also limit it and further develops; Metal has good texture and sense of touch, but complex manufacturing technology and the yields of finished product is lower, cost increases virtually, and Later development 5G, metal pair signal produces shielding, is also difficult to be further developed; Glass has outward appearance exquisiteness, glittering and translucent, but it is frangible, high with maintenance cost after sale.Mobile phone enters the 5G epoch from now on, the quantity of array antenna will increase far away, at that time, plastics have very large loss to microwave signal, and metal shell self has shielding action to signal, glass is because it is frangible and the limitation of design, also be difficult to be played, and due to the increasing number of array antenna, accomplish inside mobile phone shell on the back, on mainboard, virtually will increase the gauge of mobile phone, make troubles virtually to the use of user.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of mobile phone shell on the back, and realize by the transition of traditional appearance part to functor, described mobile phone shell on the back diverse in function, can be used as the second mainboard of mobile phone.
Technical problem to be solved by this invention is also, provides a kind of preparation method of above-mentioned mobile phone shell on the back, and described preparation method's technique is simple, easily operates.
For reaching above-mentioned technique effect, the invention provides a kind of preparation method of feature phone shell on the back, comprising:
(1) the raw material mixing also slurrying will prepared needed for mobile phone shell on the back, obtain ceramic curtain coating element sheet by casting machine, wherein, the raw material prepared needed for mobile phone shell on the back comprises zirconia, binding agent, dispersant and plasticizer;
(2) added in ceramic curtain coating element sheet by printing or welding by functor, described functor comprises circuit, chip, antenna, NFC module;
(3) one or more ceramic curtain coating element sheet being added with functor is carried out lamination process;
(4) the ceramic curtain coating element sheet after lamination is carried out laminating process;
(5) isostatic pressed process is carried out by laminating the ceramic curtain coating element sheet after process;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) the ceramic curtain coating element sheet after binder removal process is sintered, obtain finished product.
As the improvement of such scheme, described functor is printed on ceramic curtain coating element sheet by silk-screen printing technique.
As the improvement of such scheme, described functor also comprises the coil for wireless charging, and described coil is printed on every layer of ceramic curtain coating element sheet, realizes electrical connection between every layer of ceramic curtain coating element sheet by through hole.
As the improvement of such scheme, described coil is printed on ceramic curtain coating element sheet by silk-screen printing technique or photoetching process, and the slurry that described silk-screen printing technique adopts is tungsten slurry, molybdenum slurry, platinum slurry, ruthenium slurry, rhodium slurry or Gold conductor.
As the improvement of such scheme, the raw material prepared needed for mobile phone shell on the back comprises:
Zirconia 50-80 part
Binding agent 1-10 part
Dispersant 0.1-5 part
Plasticizer 0.1-5 part
Solvent 10-35 part.
As the improvement of such scheme, described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersant is one in triethanolamine, tributyl phosphate, terpinol or combination;
Described plasticizer is one in polyethylene glycol, phthalic acid ester, ethylene glycol or combination.
As the improvement of such scheme, the ceramic curtain coating element sheet after described lamination is undertaken laminating process by press, the pressure≤15Mpa of described press.
As the improvement of such scheme, the pressure of described isostatic pressed process is 13-300MPa.
As the improvement of such scheme, the temperature of described sintering is 1300 DEG C-1700 DEG C, and sintering time is 24-72h.
Accordingly, the present invention also discloses a kind of feature phone shell on the back obtained by above-mentioned preparation method.
Implement the present invention and there is following beneficial effect:
The invention provides a kind of feature phone shell on the back, adopt zirconia ceramics, use casting technology to make laminated structure, and various circuit is accomplished, in ceramic curtain coating element sheet, eventually pass the techniques such as binder removal, sintering, cutting, polishing and make mobile phone shell on the back.The extreme hardness that pottery is intrinsic; the various devices of cell phone mainboard and interior of mobile phone can be protected; and because various circuit, chip etc. are located in ceramic curtain coating element sheet, it is functor that mobile phone shell on the back is made the transition by traditional appearance member, is progressively converted into the second mainboard of mobile phone.Adopt casting technology using ceramic mobile phone shell on the back as its second mainboard, this has great advantage to the electronic device epoch that Internet of Things on the horizon, Smart Home etc. have a lot of transducer, this technique can not only save space greatly, and can also the utilization ratio of room for promotion greatly.
Concrete, be positioned over by the devices such as antenna in mobile phone shell on the back, what signal can be made to propagate is more sensitive, and saves the space on mainboard, and what mobile phone was done is thinner; NFC is placed in mobile phone shell on the back, wireless telecommunications will be made more sensitive, convenient, and save the space on mainboard, what mobile phone was done is thinner; The coil of wireless charging is placed in mobile phone shell on the back, and coil can in mobile phone shell on the back laminated multi-layer, the efficiency of wireless charging and speed are promoted a magnitude.
In addition, the present invention adopts pottery as the raw material preparing mobile phone shell on the back, and relative to metal, pottery is non-conductive, does not produce shielding action completely, do not affect the transmission of signal to signal; Relative to plastics, pottery is lossless to microwave signal, and signal is by more complete transmission; Relative to glass, the hardness of pottery is higher, and its resistance to falling property, resistance to wear, anti acid alkali performance more can ensure the integrality of mobile phone shell on the back.And zirconia ceramics Mohs' hardness is close to sapphire, and most objects such as daily run into metal and glass can not produce scratch to it.
Accompanying drawing explanation
Fig. 1 is the flow chart of the preparation method of feature phone shell on the back of the present invention;
Fig. 2 is the structural representation of feature phone shell on the back of the present invention;
Fig. 3 is the structural representation of another embodiment of feature phone shell on the back of the present invention;
Fig. 4 is the schematic diagram of feature phone shell on the back antenna efficiency of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the invention provides a kind of preparation method of feature phone shell on the back, comprising:
S101, the raw material mixing also slurrying that will prepare needed for mobile phone shell on the back, obtain ceramic curtain coating element sheet by casting machine, wherein, the raw material prepared needed for mobile phone shell on the back comprises zirconia, binding agent, dispersant and plasticizer.
Wherein, the raw material prepared needed for mobile phone shell on the back comprises:
Zirconia 50-80 part
Binding agent 1-10 part
Dispersant 0.1-5 part
Plasticizer 0.1-5 part
Solvent 10-35 part.
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersant is one in triethanolamine, tributyl phosphate, terpinol or combination;
Described plasticizer is one in polyethylene glycol, phthalic acid ester, ethylene glycol or combination;
Described solvent is water or organic solvent.
Preferably, the raw material prepared needed for mobile phone shell on the back comprises:
Zirconia 55-75 part
Binding agent 1-8 part
Dispersant 0.1-3 part
Plasticizer 0.1-3 part
Solvent 15-30 part.
Described binding agent is the combination of polymethyl acrylate, ethyl cellulose, polyvinyl alcohol, and wherein, the amount ratio between polymethyl acrylate, ethyl cellulose, polyvinyl alcohol can be 1-2:1-2:1-2, but is not limited thereto.
Described dispersant is the one in triethanolamine, tributyl phosphate, terpinol;
Described plasticizer is the one in polyethylene glycol, phthalic acid ester, ethylene glycol;
Described solvent is water.
It should be noted that, the raw material prepared needed for mobile phone shell on the back refers to weight portion.
S102, by functor by print or weld add to ceramic curtain coating element sheet in, described functor comprises circuit, chip, antenna, NFC module.
Described functor is printed on ceramic curtain coating element sheet preferably by silk-screen printing technique, and the slurry that silk-screen printing technique adopts can be copper slurry, tungsten slurry, molybdenum slurry, platinum slurry, ruthenium slurry, rhodium slurry, Gold conductor, but is not limited thereto.Preferably, the slurry that silk-screen printing technique adopts is copper slurry, the formula of described copper slurry is: copper powder 70-85%, glass dust 2-10%, organic carrier 10-20%, wherein, organic carrier is made up of the terpinol of 55-65%, 20-25% butyl carbitol acetate, 5-15% dibutyl phthalate, 5-10% ethyl cellulose, 0.1-2% castor oil, 01-2% polyamide wax.Better, the formula of described copper slurry is: copper powder 80%, glass dust 5%, organic carrier 15%, wherein, organic carrier by 58% terpinol, 25% butyl carbitol acetate, 8% dibutyl phthalate, 8% ethyl cellulose, 0.5% castor oil, 0.5% polyamide wax form.Above-mentioned % is weight percentage.
Adopt above-mentioned organic carrier, make copper slurry have good bonding, boiling characteristics, thixotropy and levelability.The present invention adopts specific copper formula (copper powder 70-85%, glass dust 2-10%, organic carrier 10-20%), makes copper slurry have excellent silk screen printing performance, even film layer after reaching silk screen printing, densification, smooth, to require and technical indicator clearly.The conducting film sheet resistance of described copper slurry is 6.2m Ω/, and adhesive force reaches 18N/mm
2.
The devices such as antenna are positioned in mobile phone shell on the back, and what signal can be made to propagate is more sensitive, and saves the space on mainboard, and what mobile phone was done is thinner, and the gross thickness of mobile phone shell on the back can be controlled in 0.2mm-2mm.
Antenna can produce eddy current to weaken the magnetic field of antenna at conductive surface, NFC is placed in bonnet, metal material on mainboard can not produce interference to NFC signal, therefore signal will be sensitiveer, it is more convenient to use, and the space saved on mainboard, what make mobile phone do is thinner, and the gross thickness of mobile phone shell on the back can be controlled in 0.2mm-2mm.
It should be noted that, NFC (NearFieldCommunication) refers to the short distance wireless communication technology, is a kind of radiotechnics of short distance high frequency, runs in 20 cm distance in 13.56MHz frequency.NFC module can be specifically NFC chip, and NFC chip has mutual communication function, and have computing capability, also containing encryption logic circuit in Felica standard.
Further, described functor also comprises the multiple coils for wireless charging, and described coil is printed on every layer of ceramic curtain coating element sheet, realizes electrical connection between every layer of ceramic curtain coating element sheet by through hole.The coil of wireless charging is placed in mobile phone shell on the back, and coil can in mobile phone shell on the back laminated multi-layer, the efficiency of wireless charging and speed are promoted a magnitude.
Now, described mobile phone shell on the back is composited by least two-layer ceramic curtain coating element sheet, because single-layer ceramic curtain coating element sheet can do very thin, the thickness of single-layer ceramic curtain coating element sheet is 20 μm-1000 μm, coil is printed with again on every layer of ceramic curtain coating element sheet, electrical connection is realized by through hole between pottery curtain coating element sheet, thus the gross thickness of mobile phone shell on the back is controlled for 0.2mm-2mm, like this, by lamination repeatedly, increase coil quantity, both improve the transmission rate of wireless charging, also can not increase the thickness of mobile phone, even can also reduce the thickness of mobile phone.
Every layer of ceramic curtain coating element sheet is printed with coil, silk-screen printing technique or photoetching process are selected in described printing, and this makes the integral position of coil more neat, and the efficiency of inductance coupling high is higher, then the efficiency of wireless charging have also been obtained significant lifting, rises to 70%-80% by original 30%-40%.The slurry that described silk-screen printing technique adopts is tungsten slurry, molybdenum slurry, platinum slurry, ruthenium slurry, rhodium slurry or Gold conductor.Electrical connection is realized preferably by tungsten slurry or molybdenum copper vias between every layer of ceramic curtain coating element sheet.
S103, one or more ceramic curtain coating element sheet being added with functor is carried out lamination process.
It should be noted that, if mobile phone shell on the back of the present invention is only provided with a ceramic curtain coating element sheet, then lamination treatment step can omit.
S104, the ceramic curtain coating element sheet after lamination is carried out laminating process.
Ceramic curtain coating element sheet after lamination is undertaken laminating process by press, pressure≤the 15MPa of described press, above-mentioned pressure is adopted to laminate process to ceramic curtain coating element sheet, can make well to be bonded together between lamella, and make the geomery of the ceramic curtain coating element sheet after lamination within zone of reasonableness, so that the later stage carries out isostatic pressed process.
S105, carry out isostatic pressed process by laminating the element of the ceramic curtain coating after process sheet.
The pressure of described isostatic pressed process is preferably 13-300MPa.
S106, the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process.
Concrete, the ceramic curtain coating element sheet after isostatic pressed process is put to draft glue discharging furnace, discharges the moisture in base substrate and organic substance.
S107, the ceramic curtain coating element sheet after binder removal process to be sintered, obtain finished product.
The temperature of described sintering is 1300 DEG C-1700 DEG C, and sintering time is 24-72h.Before sintering, first carry out binder removal, low temperature bonding agent is removed.Subsequently, carry out sintering in sintering furnace, middle gentle high-temperature agglomerant, at about 1600 degree, is removed by temperature.The present invention carries out sintering processes in the temperature range of 1300 DEG C-1700 DEG C, binding agent can be eliminated as much as possible, makes last ceramic product have inner homogeneous, ensures the performance of pottery.
As shown in Figure 2, the invention provides a kind of mobile phone shell on the back, described mobile phone shell on the back preparation method as shown in Figure 1 obtains, and described mobile phone shell on the back is made up of single-layer ceramic curtain coating element sheet 1, single-layer ceramic curtain coating element sheet 1 is provided with functor 2, and functor 2 comprises circuit, chip, antenna, NFC module.
As shown in Figure 3, the invention provides a kind of mobile phone shell on the back, described mobile phone shell on the back preparation method as shown in Figure 1 obtains, described mobile phone shell on the back is made up of multi-layer ceramics curtain coating element sheet 1, at least one deck pottery curtain coating element sheet is provided with the functors 2 such as circuit, chip, antenna, NFC module, and other ceramic curtain coating element sheets are provided with the coil 3 for wireless charging.
The functors such as circuit interconnects, chips welding and other such as antenna, NFC, wireless charging are placed in mobile phone shell on the back by the present invention, and the properties of mobile phone can not only be made to promote a new height, and what mobile phone more can be made to do is thinner, more fashion, beautiful.The present invention can carve various lines, decorative pattern, pattern etc. at mobile phone shell on the back, or can blasting craft be adopted, in mobile phone shell on the back surface spray layer of metal, ceramic bonnet is made to have metal effect, or plating one deck ink changes its different color, or with the technology of PVD or plating one deck AF film (anti-fingerprint layer), reduce the attachment of fingerprint and various spot, above-mentioned appearance design does not all affect Signal transmissions.Concrete, described lines, decorative pattern can be realized by techniques such as laser, and pattern can be realized by PVD technique.
The present invention is set forth further below with specific embodiment
Embodiment 1
(1) 50g zirconia, 30g solvent, 10g binding agent, 5g dispersant, 5g plasticizer mixing also slurrying, obtain by casting machine the ceramic curtain coating element sheet that thickness is 0.1mm;
(2) circuit, chip, antenna, NFC module are added in ground floor pottery curtain coating element sheet by printing or welding, coil is added in second layer pottery curtain coating element sheet by silk-screen printing technique;
(3) two-layer ceramic curtain coating element sheet is carried out lamination process;
(4) carried out laminating process by the ceramic curtain coating element sheet after lamination, the pressure of described press is 10MPa;
(5) carry out isostatic pressed process by laminating the ceramic curtain coating element sheet after process, the pressure of isostatic pressed process is 13Mpa;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) sintered by the ceramic curtain coating element sheet after binder removal process, sintering temperature is 1450 DEG C, and sintering time is 24h, obtains the finished product that thickness is 0.2mm.
Embodiment 2
(1) 60g zirconia, 30g solvent, 5g binding agent, 2g dispersant, 3g plasticizer mixing also slurrying, obtain by casting machine the ceramic curtain coating element sheet that thickness is 0.08mm;
(2) circuit, chip, antenna, NFC module are added in ground floor pottery curtain coating element sheet by printing or welding, coil is added in the second to six layer of ceramic curtain coating element sheet by silk-screen printing technique;
(3) six layers of ceramic curtain coating element sheet are carried out lamination process;
(4) carried out laminating process by the ceramic curtain coating element sheet after lamination, the pressure of described press is 12MPa;
(5) carry out isostatic pressed process by laminating the ceramic curtain coating element sheet after process, the pressure of isostatic pressed process is 20Mpa;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) sintered by the ceramic curtain coating element sheet after binder removal process, sintering temperature is 1550 DEG C, and sintering time is 35h, obtains the finished product that thickness is 0.48mm.
Embodiment 3
(1) 70g zirconia, 20g solvent, 7g binding agent, 1g dispersant, 2g plasticizer mixing also slurrying, obtain by casting machine the ceramic curtain coating element sheet that thickness is 0.1mm;
(2) circuit, chip, antenna, NFC module are added in ground floor pottery curtain coating element sheet by printing or welding, coil is added in the second to ten layer of ceramic curtain coating element sheet by silk-screen printing technique;
(3) ten layers of ceramic curtain coating element sheet are carried out lamination process;
(4) carried out laminating process by the ceramic curtain coating element sheet after lamination, the pressure of described press is 14MPa;
(5) carry out isostatic pressed process by laminating the ceramic curtain coating element sheet after process, the pressure of isostatic pressed process is 45Mpa;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) sintered by the ceramic curtain coating element sheet after binder removal process, sintering temperature is 1650 DEG C, and sintering time is 55h, obtains the finished product that thickness is 1mm.
Embodiment 4
(1) 80g zirconia, 10g solvent, 1g binding agent, 4g dispersant, 5g plasticizer mixing also slurrying, obtain by casting machine the ceramic curtain coating element sheet that thickness is 0.2mm;
(2) circuit, chip, antenna, NFC module are added in ground floor pottery curtain coating element sheet by printing or welding, coil is added in the second to three layer of ceramic curtain coating element sheet by silk-screen printing technique;
(3) three layers of ceramic curtain coating element sheet are carried out lamination process;
(4) carried out laminating process by the ceramic curtain coating element sheet after lamination, the pressure of described press is 15MPa;
(5) carry out isostatic pressed process by laminating the ceramic curtain coating element sheet after process, the pressure of isostatic pressed process is 60Mpa;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) sintered by the ceramic curtain coating element sheet after binder removal process, sintering temperature is 1700 DEG C, and sintering time is 72h, obtains the finished product that thickness is 0.6mm.
Do technology for detection to the mobile phone shell on the back of embodiment 1-4 gained below, result is as follows:
(1) thickness of the present invention, charging interval, bending strength and fracture toughness is tested:
(2) as shown in Figure 4, the antenna efficiency of the antenna efficiency in the mobile phone shell on the back of embodiment 1 and conventional mobile phone is done Experimental comparison, specific as follows:
1, experiment condition is as follows: antenna headroom 8mm, antenna height 5mm, and antenna band covers LTE full frequency band substantially, and the antenna in the mobile phone shell on the back of embodiment 1 is consistent with the cabling form of the antenna of conventional mobile phone;
2, experimental result: be provided with the efficiency of transmission of antenna in the mobile phone shell on the back of embodiment 1 as shown in the curve A of Fig. 4, the antenna of conventional mobile phone is located in PCB substrate, its efficiency of transmission is as shown in the curve B of Fig. 4, and wherein, the X-axis of Fig. 4 is frequency range, and Y-axis is efficiency;
3, experimental analysis: because the dielectric constant of zirconia material is comparatively large, some impact is had on the efficiency of antenna, but this impact is little.That is, basic and traditional suitable of antenna efficiency of the present invention.In addition, because the dielectric constant of traditional PCB material is less, the cabling of PCB antenna can need larger area.
Therefore, antenna is located in mobile phone shell on the back by the present invention, and its efficiency of transmission is better, and effectively can reduce the cabling area of antenna, is conducive to the miniaturization of antenna, thus reduces the volume of mobile phone.
It should be noted that, the present invention provide only the antenna efficiency figure of the mobile phone shell on the back of embodiment 1, and the mobile phone shell on the back shown in embodiment 1 is double-layer structure, if mobile phone shell on the back is sandwich construction (>=tri-layers), then the efficiency of transmission of antenna is better.
To sum up, the invention provides a kind of feature phone shell on the back, adopt zirconia ceramics, use casting technology to make laminated structure, and various circuit is accomplished, in ceramic curtain coating element sheet, eventually pass the techniques such as binder removal, sintering, cutting, polishing and make mobile phone shell on the back.The extreme hardness that pottery is intrinsic; the various devices of cell phone mainboard and interior of mobile phone can be protected; and because various circuit, chip etc. are located in ceramic curtain coating element sheet, it is functor that mobile phone shell on the back is made the transition by traditional appearance member, is progressively converted into the second mainboard of mobile phone.Adopt casting technology using ceramic mobile phone shell on the back as its second mainboard, this has great advantage to the electronic device epoch that Internet of Things on the horizon, Smart Home etc. have a lot of transducer, this technique can not only save space greatly, and can also the utilization ratio of room for promotion greatly.
Concrete, be positioned over by the devices such as antenna in mobile phone shell on the back, what signal can be made to propagate is more sensitive, and saves the space on mainboard, and what mobile phone was done is thinner; NFC is placed in mobile phone shell on the back, wireless telecommunications will be made more sensitive, convenient, and save the space on mainboard, what mobile phone was done is thinner; The coil of wireless charging is placed in mobile phone shell on the back, and coil can in mobile phone shell on the back laminated multi-layer, the efficiency of wireless charging and speed are promoted a magnitude.
In addition, the present invention adopts pottery as the raw material preparing mobile phone shell on the back, and relative to metal, pottery is non-conductive, does not produce shielding action completely, do not affect the transmission of signal to signal; Relative to plastics, pottery is lossless to microwave signal, and signal is by more complete transmission; Relative to glass, the hardness of pottery is higher, and its resistance to falling property, resistance to wear, anti acid alkali performance more can ensure the integrality of mobile phone shell on the back.And zirconia ceramics Mohs' hardness is close to sapphire, and most objects such as daily run into metal and glass can not produce scratch to it.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a preparation method for feature phone shell on the back, is characterized in that, comprising:
(1) the raw material mixing also slurrying will prepared needed for mobile phone shell on the back, obtain ceramic curtain coating element sheet by casting machine, wherein, the raw material prepared needed for mobile phone shell on the back comprises zirconia, binding agent, dispersant and plasticizer;
(2) added in ceramic curtain coating element sheet by printing or welding by functor, described functor comprises circuit, chip, antenna, NFC module;
(3) one or more ceramic curtain coating element sheet being added with functor is carried out lamination process;
(4) the ceramic curtain coating element sheet after lamination is carried out laminating process;
(5) isostatic pressed process is carried out by laminating the ceramic curtain coating element sheet after process;
(6) the ceramic curtain coating element sheet after isostatic pressed process is carried out binder removal process;
(7) the ceramic curtain coating element sheet after binder removal process is sintered, obtain finished product.
2. the preparation method of feature phone shell on the back as claimed in claim 1, is characterized in that, described functor is printed on ceramic curtain coating element sheet by silk-screen printing technique.
3. the preparation method of feature phone shell on the back as claimed in claim 1, it is characterized in that, described functor also comprises the coil for wireless charging, and described coil is printed on every layer of ceramic curtain coating element sheet, realizes electrical connection between every layer of ceramic curtain coating element sheet by through hole.
4. the preparation method of feature phone shell on the back as claimed in claim 3, it is characterized in that, described coil is printed on ceramic curtain coating element sheet by silk-screen printing technique or photoetching process, and the slurry that described silk-screen printing technique adopts is tungsten slurry, molybdenum slurry, platinum slurry, ruthenium slurry, rhodium slurry or Gold conductor.
5. the preparation method of feature phone shell on the back as claimed in claim 1, it is characterized in that, the raw material prepared needed for mobile phone shell on the back comprises:
Zirconia 50-80 part
Binding agent 1-10 part
Dispersant 0.1-5 part
Plasticizer 0.1-5 part
Solvent 10-35 part.
6. the preparation method of feature phone shell on the back as claimed in claim 5, it is characterized in that, described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersant is one in triethanolamine, tributyl phosphate, terpinol or combination;
Described plasticizer is one in polyethylene glycol, phthalic acid ester, ethylene glycol or combination.
7. the preparation method of feature phone shell on the back as claimed in claim 1, is characterized in that, the ceramic curtain coating element sheet after described lamination is undertaken laminating process by press, the pressure≤15MPa of described press.
8. the preparation method of feature phone shell on the back as claimed in claim 1, it is characterized in that, the pressure of described isostatic pressed process is 13-300MPa.
9. the preparation method of feature phone shell on the back as claimed in claim 1, it is characterized in that, the temperature of described sintering is 1300 DEG C-1700 DEG C, and sintering time is 24-72h.
10. a feature phone shell on the back, is characterized in that, described feature phone shell on the back is obtained by the preparation method described in any one of claim 1-9.
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| CN201510777195.5A CN105430125A (en) | 2015-11-13 | 2015-11-13 | Functional mobile phone back shell and preparation method thereof |
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| CN106986631A (en) * | 2017-04-01 | 2017-07-28 | 广东百工新材料科技有限公司 | A kind of ceramic mobile phone shell and preparation method thereof |
| CN107181046A (en) * | 2017-06-02 | 2017-09-19 | 深圳市信维通信股份有限公司 | A kind of ceramic wireless charging operation |
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| CN110357619A (en) * | 2019-08-06 | 2019-10-22 | 北京钢研新冶精特科技有限公司 | A kind of ceramic cover plate preparation method |
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Effective date of registration: 20160928 Address after: 528225, Guangdong, Foshan Province Nanhai town lion Road East Road, No. 17, science and Technology Park, No. 4 factory building Applicant after: Guangdong new Mstar Technology Ltd Address before: 518057 Guangdong city of Shenzhen province Nanshan District Guangdong streets south six road Hangsheng Technology Building 1503 Applicant before: SHENZHEN BG JY MATERIALS TECHNOLOGY CO., LTD. |
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