CN105130430A - Ceramic sheet and preparation method therefor - Google Patents
Ceramic sheet and preparation method therefor Download PDFInfo
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- CN105130430A CN105130430A CN201510525441.8A CN201510525441A CN105130430A CN 105130430 A CN105130430 A CN 105130430A CN 201510525441 A CN201510525441 A CN 201510525441A CN 105130430 A CN105130430 A CN 105130430A
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Abstract
The invention discloses a preparation method of a ceramic sheet. The preparation method comprises the following steps of: (1) mixing raw materials required for the preparation of the ceramic sheet to obtain a mixture, slurrying the mixture, and preparing one or more first cast sheets by a casting method; (2) mixing the raw materials required for the preparation of the ceramic sheet with a colorant to obtain a new mixture, slurrying the new mixture, and preparing one or more second cast sheets by the casting method; (3) performing stacking treatment on at least one second cast sheet and at least one first cast sheet to obtain a green sheet, wherein the second cast sheet is arranged on an outer surface of the green sheet; (4) performing lamination treatment on the green sheet on which stacking treatment is performed; (5) performing static pressing treatment on the laminated green sheet; (6) performing rubber removal treatment on the green sheet on which static pressing treatment is performed; and (7) sintering the green sheet on which rubber removal treatment is performed to obtain a finished product. Accordingly, the invention further discloses the ceramic sheet prepared by the preparation method. Through the adoption of the preparation method disclosed by the invention, the ceramic sheet can show vivid color, and besides, the ceramic sheet can be guaranteed to have high hardness, high wear resistance and high corrosion resistance.
Description
Technical field
The present invention relates to ceramic field, particularly a kind of ceramic plate and preparation method thereof.
Background technology
Flow casting molding refers to and add auxiliary agent in ceramics powder, obtains finely dispersed stable slurry, a kind of forming method of obtained required thickness film on casting machine.If desired final product has distinct colors of all kinds, then need to add corresponding toner in early stage in batch mixing.
Casting method is as preparing the important process of sheet layer material by ceramic research person widespread use, and have equipment simple, can operate continuously, production efficiency is high, automatization level is high, the equal first-class advantage of process stabilizing, body crack defects, has wide application in a series of fields such as production monolithic capacitor ceramics, multilayer wiring ceramics, thick film circuit substrates.The application of flow casting molding technology, provide wide prospect not only to electronics, the microminiaturization of electronic component and the realization of super large-scale integration, and provide possibility to the macrostructure design of engineering ceramics and microstructure design, the performance optimization for material provides a new approach.
Mention above, if desired various different colours, normally add toner in early stage in batch mixing process.But due to the existence of toner, there is certain change in final product performance.For zirconia ceramics, owing to the addition of toner, the product after shaping in hardness, wear resistance, erosion resistance etc. all can have decline to a certain degree.A kind of new technique can be found, be not adopt to sacrifice performance of pottery itself, but final finished product can be made to have the effect of equal colors, if can come true, will greatly promote casting technology in the wide application of each different field.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of ceramic plate and preparation method thereof, product can be made to develop the color true to nature, also can ensure that product has good hardness, wear resistance and erosion resistance simultaneously.
For reaching above-mentioned technique effect, the invention provides a kind of preparation method of ceramic plate, comprising:
(1) the raw material mixing also slurrying will prepared needed for ceramic plate, by the obtained first curtain coating element sheet of casting method;
(2) raw material prepared needed for ceramic plate and toner are mixed and slurrying, by the obtained second curtain coating element sheet of casting method;
(3) at least one second curtain coating element sheet and at least one the first curtain coating element sheet are carried out lamination process, obtain blank after superposition, described second curtain coating element sheet is placed in the outside surface of blank;
(4) blank after lamination is carried out laminating process;
(5) isostatic pressed process is carried out by laminating the blank after process;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process is sintered, obtain finished product.
As the improvement of such scheme, described blank is superposed by 2 the second curtain coating element sheets and 1-18 the first curtain coating element sheet and is formed, and described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet.
As the improvement of such scheme, the described raw material prepared needed for ceramic plate comprises:
Aggregate 50-80 part
Solvent 10-35 part
Binding agent 1-10 part
Dispersion agent 0.1-5 part
Softening agent 0.1-5 part.
As the improvement of such scheme, described aggregate is one in zirconium white, aluminum oxide, silicon-dioxide or combination;
Described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersion agent is one in trolamine, tbp, Terpineol 350 or combination;
Described softening agent is one in polyoxyethylene glycol, phthalic ester, ethylene glycol or combination.
As the improvement of such scheme, the addition of described toner is 0.1-5 part.
As the improvement of such scheme, the blank 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 13-60MPa.
As the improvement of such scheme, the temperature of described sintering is 1400 DEG C-1700 DEG C, and sintering time is 24-72h.
As the improvement of such scheme, the thickness of described first curtain coating element sheet, the second curtain coating element sheet is 20 μm-1000 μm.
As the improvement of such scheme, the thickness of described blank is 0.04mm-4mm.
Accordingly, the present invention also discloses a kind of ceramic plate, and described ceramic plate adopts above-mentioned preparation method to obtain.
Implement the present invention and there is following beneficial effect:
The present invention gives up in the past to sacrifice the performance of material own to exchange the set pattern of color for, concrete, first by the stable slurry of the overwhelming majority, does not add any toner, obtains the first curtain coating element sheet by normal curtain coating mode; The slurry getting few part adds toner, obtains the second curtain coating element sheet.Then when lamination, take to adopt in the middle part of lamination containing the first curtain coating element sheet of toner, and lamination upper bottom portion and/or lower bottom part adopt the second curtain coating element sheet containing toner, secondly, then by laminating, isostatic pressed, binder removal and sintering etc., finally obtain product.Now the performance that has of this product with not containing the product of toner almost without any difference, and this product has with the product adding toner very close in color appearance.Therefore, the product colour developing after the present invention is shaping is true to nature, also can ensure that product has good hardness, wear resistance and erosion resistance simultaneously.
And the color of product, on the basis not affecting the performance of material own, can be made various change by the present invention, and its product finally obtained can have color miscellaneous, has multiple choices in color and luster.
In addition, the present invention can not produce any impact, the performances such as such as more non-friable, plasticity is good to its advantage making product of casting technique.The present invention will greatly promote the wide application of casting technology in different field.
Accompanying drawing explanation
Fig. 1 is the schema of the preparation method of a kind of ceramic plate of the present invention;
Fig. 2 is the structure iron of a kind of ceramic plate one of the present invention embodiment;
Fig. 3 is the structure iron of a kind of another embodiment of ceramic plate 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 ceramic plate, comprising:
S101, the raw material mixing also slurrying that will prepare needed for ceramic plate, by the obtained first curtain coating element sheet of casting method;
In step S101, the raw material prepared needed for ceramic plate comprises:
Aggregate 50-80 part
Solvent 10-35 part
Binding agent 1-10 part
Dispersion agent 0.1-5 part
Softening agent 0.1-5 part.
Described aggregate is one in zirconium white, aluminum oxide, silicon-dioxide or combination;
Described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersion agent is one in trolamine, tbp, Terpineol 350 or combination;
Described softening agent is one in polyoxyethylene glycol, phthalic ester, ethylene glycol or combination.
Preferably, in step S101, the raw material prepared needed for ceramic plate comprises:
Aggregate 55-75 part
Solvent 15-30 part
Binding agent 1-8 part
Dispersion agent 0.1-3 part
Softening agent 0.1-3 part.
Described aggregate is the one in zirconium white, aluminum oxide, silicon-dioxide;
Described solvent is water;
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 dispersion agent is the one in trolamine, tbp, Terpineol 350;
Described softening agent is the one in polyoxyethylene glycol, phthalic ester, ethylene glycol.
S102, by the raw material prepared needed for ceramic plate and toner mixing and slurrying, by the obtained second curtain coating element sheet of casting method;
In step S102, the described raw material prepared needed for ceramic plate comprises:
Aggregate 50-80 part
Solvent 10-35 part
Binding agent 1-10 part
Dispersion agent 0.1-5 part
Softening agent 0.1-5 part
Toner 0.1-5 part.
Described aggregate is one in zirconium white, aluminum oxide, silicon-dioxide or combination;
Described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersion agent is one in trolamine, tbp, Terpineol 350 or combination;
Described softening agent is one in polyoxyethylene glycol, phthalic ester, ethylene glycol or combination.
Preferably, in step S102, the raw material prepared needed for ceramic plate comprises:
Aggregate 55-75 part
Solvent 15-30 part
Binding agent 1-8 part
Dispersion agent 0.1-3 part
Softening agent 0.1-3 part
Toner 0.1-5 part.
Described aggregate is the one in zirconium white, aluminum oxide, silicon-dioxide;
Described solvent is water;
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 dispersion agent is the one in trolamine, tbp, Terpineol 350;
Described softening agent is the one in polyoxyethylene glycol, phthalic ester, ethylene glycol.
It should be noted that, the raw material prepared needed for ceramic plate refers to weight part.
S103, at least one second curtain coating element sheet and at least one the first curtain coating element sheet are carried out lamination process, obtain blank after superposition, described second curtain coating element sheet is placed in the outside surface of blank.
Preferably, described blank is superposed by 2 the second curtain coating element sheets and 1-18 the first curtain coating element sheet and is formed, and described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet.Wherein, the thickness of described first curtain coating element sheet, the second curtain coating element sheet is 20 μm-1000 μm, and the total thickness of described blank is 0.04mm-4mm.
Better, described blank is superposed by 2 the second curtain coating element sheets and 4-15 the first curtain coating element sheet and is formed, and described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet.Wherein, the thickness of described first curtain coating element sheet, the second curtain coating element sheet is 20 μm-500 μm, and the total thickness of described blank is 0.2mm-2mm.
S104, the blank after lamination is carried out laminating process;
Concrete, blank after described lamination is undertaken laminating process by press, pressure≤the 15MPa of described press, above-mentioned pressure is adopted to laminate process to blank, can make well to be bonded together between lamella, and make the geomery of the blank 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 blank after process;
The pressure of described isostatic pressed process is 13-60MPa.
S106, the blank after isostatic pressed process is carried out binder removal process;
Concrete, the blank after isostatic pressed process is put to draft glue discharging furnace, discharges the moisture in base substrate and organism.
S107, the blank after binder removal process to be sintered, obtain finished product.
The temperature of described sintering is 1400 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 oven, 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 1400 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 2,3, the invention provides a kind of ceramic plate, described ceramic plate preparation method as shown in Figure 1 obtains.Concrete, described ceramic plate comprises some laminar flows and prolongs plain sheet, and curtain coating element sheet comprises the first curtain coating element sheet 1 not containing toner and the second curtain coating element sheet 2, the second curtain coating element sheet 2 containing toner is not placed in outside surface.
Ceramic plate of the present invention has numerous embodiments, (1) as shown in Figure 2, ceramic plate comprises 2 the second curtain coating element sheets 2 and several the first curtain coating element sheet 1, second curtain coating element sheets 2 are placed in upper and lower bottom, and described first curtain coating element sheet 1 is placed in the centre of the second curtain coating element sheet 2.(2) as shown in Figure 3, ceramic plate comprises 1 the second curtain coating element sheet 2 and several the first curtain coating element sheet 1, second curtain coating element sheets 2 are placed in upper bottom portion or lower bottom part, and the first curtain coating element sheet 1 is placed in below or the top of the second curtain coating element sheet 2.
It should be noted that, when ceramic plate comprises 2 the second curtain coating element sheets 2 and several the first curtain coating element sheets 1,2 the second curtain coating element sheets 2 can adopt same color, also can adopt different colours.The color of product, on the basis not affecting the performance of material own, can be made various change by the present invention, and its product finally obtained can have color miscellaneous, in color and luster, have multiple choices.And the second curtain coating element sheet 2 can also do various decorative pattern, pattern, to enrich the outward appearance of finished product.
The present invention is set forth further below with specific embodiment
Embodiment 1
(1) prepare the first curtain coating element sheet: 50g aggregate, 30g solvent, 10g binding agent, 5g dispersion agent, 5g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 20 μm;
(2) prepare the second curtain coating element sheet: 50g aggregate, 30g solvent, 10g binding agent, 5g dispersion agent, 5g softening agent, 1g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 20 μm;
(3) 2 the second curtain coating element sheets and 5 the first curtain coating element sheets are carried out lamination process, described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet, obtains the blank that total thickness is 0.14mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 10MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 13Mpa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1450 DEG C, and sintering time is 24h, obtains finished product.
Embodiment 2
(1) prepare the first curtain coating element sheet: 60g aggregate, 30g solvent, 5g binding agent, 2g dispersion agent, 3g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 50 μm;
(2) prepare the second curtain coating element sheet: 60g aggregate, 30g solvent, 5g binding agent, 2g dispersion agent, 3g softening agent, 2g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 50 μm;
(3) 2 the second curtain coating element sheets and 13 the first curtain coating element sheets are carried out lamination process, described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet, obtains the blank that total thickness is 0.75mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 12MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 20MPa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1500 DEG C, and sintering time is 35h, obtains finished product.
Embodiment 3
(1) prepare the first curtain coating element sheet: 65g aggregate, 25g solvent, 8g binding agent, 1g dispersion agent, 1g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 100 μm;
(2) prepare the second curtain coating element sheet: 65g aggregate, 25g solvent, 8g binding agent, 1g dispersion agent, 1g softening agent, 3g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 100 μm;
(3) 2 the second curtain coating element sheets and 18 the first curtain coating element sheets are carried out lamination process, described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet, obtains the blank that total thickness is 2mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 13MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 40MPa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1600 DEG C, and sintering time is 50h, obtains finished product.
Embodiment 4
(1) prepare the first curtain coating element sheet: 70g aggregate, 20g solvent, 7g binding agent, 1g dispersion agent, 2g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 80 μm;
(2) prepare the second curtain coating element sheet: 70g aggregate, 20g solvent, 7g binding agent, 1g dispersion agent, 2g softening agent, 4g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 80 μm;
(3) 2 the second curtain coating element sheets and 1 the first curtain coating element sheet are carried out lamination process, described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet, obtains the blank that total thickness is 0.24mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 14MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 45MPa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1650 DEG C, and sintering time is 55h, obtains finished product.
Embodiment 5
(1) prepare the first curtain coating element sheet: 75g aggregate, 15g solvent, 2g binding agent, 5g dispersion agent, 3g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 150 μm;
(2) prepare the second curtain coating element sheet: 75g aggregate, 15g solvent, 2g binding agent, 5g dispersion agent, 3g softening agent, 2g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 150 μm;
(3) 2 the second curtain coating element sheets and 8 the first curtain coating element sheets are carried out lamination process, described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet, obtains the blank that total thickness is 1.5mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 12MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 50MPa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1600 DEG C, and sintering time is 60h, obtains finished product.
Embodiment 6
(1) prepare the first curtain coating element sheet: 80g aggregate, 10g solvent, 1g binding agent, 4g dispersion agent, 5g softening agent mixing also slurrying, obtain by casting method the first curtain coating element sheet that thickness is 1000 μm;
(2) prepare the second curtain coating element sheet: 80g aggregate, 10g solvent, 1g binding agent, 4g dispersion agent, 5g softening agent, 0.5g toner mixing also slurrying, obtain by casting method the second curtain coating element sheet that thickness is 1000 μm;
(3) 1 the second curtain coating element sheet and 2 the first curtain coating element sheets are carried out lamination process, described second curtain coating element sheet is placed in upper bottom portion, and described first curtain coating element sheet is placed in the below of the second curtain coating element sheet, obtains the blank that total thickness is 3mm after superposition;
(4) blank after lamination undertaken laminating process by press, the pressure of described press is 15MPa;
(5) carry out isostatic pressed process by laminating the blank after process, the pressure of isostatic pressed process is 60MPa;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process sintered, sintering temperature is 1700 DEG C, and sintering time is 72h, obtains finished product.
Carry out technology for detection to the finished product of embodiment 1-6 gained, result is as follows:
As from the foregoing, product of the present invention has good bending strength and breaking tenacity, its wear resistance and erosion resistance are also better, the performance that product of the present invention has and the product almost indistinction not containing toner, and this product has with the product adding toner very close in color appearance.
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 ceramic plate, is characterized in that, comprising:
(1) the raw material mixing also slurrying will prepared needed for ceramic plate, by the obtained first curtain coating element sheet of casting method;
(2) raw material prepared needed for ceramic plate and toner are mixed and slurrying, by the obtained second curtain coating element sheet of casting method;
(3) at least one second curtain coating element sheet and at least one the first curtain coating element sheet are carried out lamination process, obtain blank after superposition, described second curtain coating element sheet is placed in the outside surface of blank;
(4) blank after lamination is carried out laminating process;
(5) isostatic pressed process is carried out by laminating the blank after process;
(6) blank after isostatic pressed process is carried out binder removal process;
(7) blank after binder removal process is sintered, obtain finished product.
2. the preparation method of ceramic plate as claimed in claim 1, it is characterized in that, described blank is superposed by 2 the second curtain coating element sheets and 1-18 the first curtain coating element sheet and is formed, and described second curtain coating element sheet is placed in upper and lower bottom, and described first curtain coating element sheet is placed in the centre of the second curtain coating element sheet.
3. the preparation method of ceramic plate as claimed in claim 1, it is characterized in that, the described raw material prepared needed for ceramic plate comprises:
Aggregate 50-80 part
Solvent 10-35 part
Binding agent 1-10 part
Dispersion agent 0.1-5 part
Softening agent 0.1-5 part.
4. the preparation method of ceramic plate as claimed in claim 3, is characterized in that, described aggregate is one in zirconium white, aluminum oxide, silicon-dioxide or combination;
Described solvent is water or organic solvent;
Described binding agent is one in polymethyl acrylate, ethyl cellulose, polyvinyl alcohol or combination;
Described dispersion agent is one in trolamine, tbp, Terpineol 350 or combination;
Described softening agent is one in polyoxyethylene glycol, phthalic ester, ethylene glycol or combination.
5. the preparation method of ceramic plate as claimed in claim 3, it is characterized in that, the addition of described toner is 0.1-5 part.
6. the preparation method of ceramic plate as claimed in claim 1, it is characterized in that, the blank after described lamination is undertaken laminating process by press, the pressure≤15MPa of described press.
7. the preparation method of ceramic plate as claimed in claim 1, it is characterized in that, the pressure of described isostatic pressed process is 13-60MPa.
8. the preparation method of ceramic plate as claimed in claim 1, it is characterized in that, the temperature of described sintering is 1400 DEG C-1700 DEG C, and sintering time is 24-72h.
9. the preparation method of ceramic plate as claimed in claim 1, is characterized in that, the thickness of described first curtain coating element sheet, the second curtain coating element sheet is 20 μm-1000 μm;
The thickness of described blank is 0.04mm-4mm.
10. a ceramic plate, is characterized in that, described ceramic plate adopts the preparation method as described in any one of claim 1-9 to obtain.
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| CN110606752A (en) * | 2019-10-11 | 2019-12-24 | 东莞市陶陶新材料科技有限公司 | Process for preparing colour ceramic with clear boundary |
| CN110606752B (en) * | 2019-10-11 | 2022-03-18 | 东莞市陶陶新材料科技有限公司 | Process for preparing colour ceramic with clear boundary |
| 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 |
| CN112194486A (en) * | 2020-10-21 | 2021-01-08 | 深圳陶陶科技有限公司 | Functional interlayer composite ceramic material and preparation method thereof |
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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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