CN106790790B - Ceramic rear cover of wireless charging terminal and manufacturing method thereof - Google Patents
Ceramic rear cover of wireless charging terminal and manufacturing method thereof Download PDFInfo
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- CN106790790B CN106790790B CN201611090475.XA CN201611090475A CN106790790B CN 106790790 B CN106790790 B CN 106790790B CN 201611090475 A CN201611090475 A CN 201611090475A CN 106790790 B CN106790790 B CN 106790790B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims description 76
- 239000002002 slurry Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 25
- 238000007639 printing Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 19
- 239000011521 glass Substances 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 16
- 239000003960 organic solvent Substances 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 15
- 229910000510 noble metal Inorganic materials 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical group CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 10
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 10
- 229940116411 terpineol Drugs 0.000 claims description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002041 carbon nanotube Substances 0.000 claims description 8
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- 229920000609 methyl cellulose Polymers 0.000 claims description 8
- 239000001923 methylcellulose Substances 0.000 claims description 8
- VNWKTOKETHGBQD-AKLPVKDBSA-N carbane Chemical compound [15CH4] VNWKTOKETHGBQD-AKLPVKDBSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 238000009472 formulation Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 235000010981 methylcellulose Nutrition 0.000 description 7
- 239000004576 sand Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000005388 borosilicate glass Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- H02J7/025—
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The invention discloses a ceramic rear cover of a wireless charging terminal and a manufacturing method thereof. The ceramic rear cover of the wireless charging terminal can meet the small space of wireless charging requirements, and is good in heat dissipation effect and high in charging conversion efficiency.
Description
Technical Field
The invention relates to a ceramic rear cover of a wireless charging terminal and a manufacturing method thereof.
Background
With the increasing functions of smartphones, smartphones have become increasingly powerful life assistants for humans and are a well-formed partner with human lives. With the increase of the use frequency, the electric quantity consumption of a battery in the mobile phone is increased, the charging frequency is also increased, each mobile phone is provided with a charger and a charging wire, the mobile phone with the android system is incompatible with the mobile phone with the apple system, the charging wire of the mobile phone exists in each corner of a room like a spider web, and the problem can be well solved by the wireless charging technology.
At present, the common solution for wireless charging mobile phones is to adhere a prefabricated conductive coil to a back plate of a battery cover, place the mobile phone on a wireless charger during charging, and achieve the purpose of wireless charging through electromagnetic induction. The prior art has the following problems:
1. occupying the space of the mobile phone;
the existing conductive coil adopts a conductive metal wire (copper wire or aluminum wire) which is adhered to the battery backboard, so that the space inside the mobile phone is occupied;
2. poor heat dissipation effect and easy heating;
the conductive coil and the mobile phone backboard adopt a bonding mode, so that the overall heat conduction performance is reduced, and the using speed of the mobile phone is influenced.
3. The charging conversion efficiency is low;
in the charging process, the electromagnetic field generated by the induction coil on the wireless charger is used for cutting the conductive coil on the mobile phone backboard to generate induction current so as to supply power to the mobile phone battery, the highest charging efficiency is only about 70%, the efficiency is low, and the distance between the charging efficiency and the mobile phone battery is very close.
The ceramic mobile phone rear cover has good decorative effect due to the warm jade feeling, and the wireless charging technology has the characteristics of simplicity and convenience, which are necessarily the development trend of future mobile phones. However, as smart phones have more and more functions, the functional chips occupy too many positions, and the space reserved for the mobile phone battery is not enough. The traditional wireless charging method has seriously affected the narrow space by adhering a metal coil on the mobile phone backboard, and the charging efficiency is lower than 75%.
The above drawbacks severely limit the popularity of unlimited charging technologies.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides a ceramic rear cover of a wireless charging terminal and a manufacturing method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a lid behind wireless charging terminal pottery, includes the ceramic backplate, still includes to cover in proper order first ferrite layer, conductive pattern layer and the second ferrite layer on the ceramic backplate, conductive pattern layer forms wireless charging induction coil.
Further:
the first ferrite layer and the second ferrite layer contain ferrite main raw materials adopting the following formula: 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 Preferably, the first ferrite layer and the second ferrite layer further contain 5-8wt% of a glass phase by weight.
The conductive pattern layer contains 70-80 wt% of noble metal powder, 2-5 wt% of graphene, 3-8 wt% of carbon nano tubes and 15-20wt% of glass, wherein the noble metal powder is preferably nano silver powder or gold powder.
The thickness of each of the first ferrite layer, the conductive pattern layer and the second ferrite layer is 15-20 μm.
The ceramic backboard is a zirconia ceramic backboard.
A wireless charging terminal is provided with the ceramic rear cover of the wireless charging terminal.
The manufacturing method for manufacturing the ceramic rear cover of the wireless charging terminal comprises the following steps:
s1, printing a layer of ferrite slurry on a ceramic backboard, and drying to form a first ferrite layer;
s2, printing a layer of conductive paste pattern on the first ferrite layer, and drying to form the conductive pattern layer;
s3, printing another layer of ferrite slurry on the conductive pattern layer, and drying to form a second ferrite layer, wherein the second ferrite layer is formed;
s4, sintering the conductive pattern layer and the ceramic backboard integrally, and forming the wireless charging induction coil by the conductive pattern layer.
Further:
in the step S1 and the step S3, the ferrite slurry is composed of 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 Adding 5-8wt% of glass phase, adding proper amount of organic solvent, and sanding, wherein the organic solvent is preferably terpineol and methylcellulose, and the baking temperature is preferably 150-180deg.C for 20-30min.
In the step S2, the conductive paste is prepared by adding a proper amount of organic solvent into raw materials comprising 70-80 wt% of noble metal powder, 2-5 wt% of graphene, 3-8 wt% of carbon nano tube and 15-20wt% of glass, and then sanding the raw materials uniformly, wherein the noble metal powder is preferably nano silver powder or gold powder, the organic solvent is preferably terpineol and methyl cellulose, and the baking temperature is preferably 150-180 ℃ and the baking time is 20-30min.
In the step S4, the sintering temperature is 1100-1200 ℃.
The invention has the beneficial effects that:
the wireless charging terminal ceramic rear cover provided by the invention comprises the first ferrite layer, the conductive pattern layer and the second ferrite layer which are sequentially covered on the ceramic backboard, wherein the conductive pattern layer forms a wireless charging induction coil, and the wireless charging terminal ceramic rear cover adopting the structure can meet the small space of wireless charging requirements, and has the advantages of good heat dissipation effect and high charging conversion efficiency.
In the preferred embodiment, the high-performance composite conductive paste which is composed of the noble metal powder, the glass powder, the organic matters and the like and has a low resistance value and good oxidation resistance is adopted in the invention; in addition, the specific ferrite paste is suitable for printing, has the same sintering temperature as the composite conductive paste with the specific formula, and can be sintered and integrally and firmly adhered to the ceramic back plate under the same sintering condition as the conductive paste. Through the wireless charging component of two kinds of thick liquids formation that prefers to adopt, can further promote the conversion efficiency that charges, improve the radiating effect.
Drawings
Fig. 1 is a schematic structural view of a ceramic rear cover of a wireless charging terminal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a ferrite layer in one embodiment of the invention;
FIG. 3 is a schematic diagram of a patterned layer of conductive paste according to an embodiment of the invention;
fig. 4 is a flowchart of a method for manufacturing a ceramic rear cover of a wireless charging terminal according to an embodiment of the invention.
Detailed Description
The following describes embodiments of the present invention in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
Referring to fig. 1 to 3, in one embodiment, a ceramic rear cover of a wireless charging terminal includes a ceramic back plate 1, and further includes a first ferrite layer 2, a conductive pattern layer 3 and a second ferrite layer 4 sequentially covering the ceramic back plate, wherein the conductive pattern layer 3 forms a wireless charging induction coil, and a terminal 5 is formed on the wireless charging induction coil for connection to a battery. The wireless charging terminal can be a mobile phone or other various consumer electronic terminals.
In a preferred embodiment, the first ferrite layer and the second ferrite layer are comprised of, for exampleFerrite main raw materials of the following formula: 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 More preferably, the first ferrite layer and the second ferrite layer further contain a glass phase in an amount of 5 to 8wt% based on the weight.
In a preferred embodiment, the conductive pattern layer contains 70 to 80wt% of noble metal powder, 2 to 5wt% of graphene, 3 to 8wt% of carbon nanotubes, and 15 to 20wt% of glass, and the noble metal powder is preferably nano silver powder or gold powder.
In a preferred embodiment, the thickness of each of the first ferrite layer, the conductive pattern layer, and the second ferrite layer is 15-20 μm.
In a preferred embodiment, the ceramic back-sheet is a zirconia ceramic back-sheet.
In another embodiment, a wireless charging terminal has the wireless charging terminal ceramic back cover of any of the preceding embodiments.
Referring to fig. 1 to 4, in another embodiment, a method for manufacturing the ceramic rear cover of the wireless charging terminal according to any one of the foregoing embodiments includes the following steps:
s1, printing a layer of ferrite slurry on a ceramic backboard, and drying to form a first ferrite layer;
s2, printing a layer of conductive paste pattern on the first ferrite layer, and drying to form the conductive pattern layer;
s3, printing another layer of ferrite slurry on the conductive pattern layer, and drying to form a second ferrite layer, wherein the second ferrite layer is formed;
s4, sintering the conductive pattern layer and the ceramic backboard integrally, and forming the wireless charging induction coil by the conductive pattern layer.
Preferably, after step S3, a layer of protective glass paste is further printed on the second ferrite layer to form a protective glass layer.
The ferrite paste is printed on a zirconia ceramic backboard, dried and cured, then the conductive paste is printed on the ceramic backboard, and after being dried and cured, the ferrite paste which is the same as the first layer is printed on the surface of the conductive coil. The wireless charging ceramic mobile phone backboard prepared by the method can well overcome the existing wireless charging problem, saves space and can improve wireless charging efficiency to 80%.
In a preferred embodiment, in step S1 and step S3, the ferrite slurry is composed of a material containing 25-30wt% of NiO, 15-20wt% of ZnO, 50-60wt% of Fe 2 O 3 Adding 5-8wt% of glass phase, adding proper amount of organic solvent, and sanding, wherein the organic solvent is preferably terpineol and methylcellulose, and the baking temperature is preferably 150-180deg.C for 20-30min.
In a preferred embodiment, in step S2, the conductive paste is prepared by adding a proper amount of organic solvent into a raw material containing 70-80 wt% of noble metal powder, 2-5 wt% of graphene, 3-8 wt% of carbon nanotube and 15-20wt% of glass, and then sanding, and uniformly mixing the raw materials, wherein the noble metal powder is preferably nano silver powder or gold powder, the organic solvent is preferably terpineol and methyl cellulose, and the preferred baking temperature is 150-180 ℃ and the time is 20-30min.
In a preferred embodiment, in step S4, the sintering temperature is 1100-1200 ℃.
In one embodiment, the method for manufacturing the ceramic rear cover of the wireless charging terminal comprises the following steps:
step 1, degreasing and sintering a zirconia ceramic blank body prepared after casting or injection molding and the like to prepare a ceramic blank body, and performing flat grinding, polishing and punching on the surface of the blank body to obtain a ceramic mobile phone backboard;
step 2, according to the formula 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 The main formula of the ferrite is composed, a glass phase accounting for 5 to 8 weight percent of the total weight of the ferrite is added, a proper amount of organic solvents such as terpineol, cellulose A and the like are added, sand milling is carried out for 20 to 22 hours in a nano sand mill, and the raw materials are uniformly mixed to prepare ferrite slurry;
step 3, printing the ferrite slurry on a ceramic mobile phone backboard in a screen printing mode, wherein the printing thickness is 15-20 mu m, and the printing pattern is shown in figure 2;
step 4, placing the ceramic mobile phone backboard printed with the ferrite slurry in a drying furnace for drying at the temperature of 150-180 ℃ for 20-30min;
step 5, 70-80 wt% of nano silver powder or gold powder, 2-5 wt% of graphene, 3-8 wt% of carbon nano tube and 15-20wt% of glass are mixed according to a proportion, and a proper amount of organic solvents such as terpineol, methyl cellulose and the like are added to be sanded for 20-22 hours in a nano sand mill, so that conductive metal slurry is prepared;
step 6, printing conductive paste on the surface of the ferrite paste finished in the step 4, wherein the printed pattern is shown in figure 3, the printing thickness is 15-20 mu m, and drying is carried out according to the conditions that the temperature is 150-180 ℃ and the time is 20-30min;
and 7, after the drying is finished, printing and covering the ferrite slurry which is the same as that in the step 2 on the surface of the conductive slurry, wherein the pattern is the same as that in the step 2.
And 8, drying the product under the same conditions as in the step 4.
Step 9, integrally sintering the ceramic mobile phone rear cover in a high-temperature sintering furnace at 1100-1200 ℃ to ensure that the ferrite slurry and the conductive slurry can be well adhered to the zirconia ceramic backboard;
the wireless charging ceramic mobile phone backboard prepared in the mode is subjected to charging efficiency test and inspection on the test equipment, and the wireless charging efficiency can be improved to 80%.
The preparation method provided by the present invention is described in more detail by the following more specific examples.
Embodiment one:
step 1, degreasing and sintering a zirconia ceramic blank body prepared after casting or injection molding and the like to prepare a ceramic blank body, and performing flat grinding, polishing and punching on the surface of the blank body to obtain a ceramic mobile phone backboard;
step 2, according to the formula 30gNiO, 20gZnO and 50gFe 2 O 3 Adding borosilicate glass powder accounting for 8g of the total amount of the ferrite into a main formula of the ferrite, adding organic solvents such as terpineol, methyl cellulose and the like, sanding for 20-22h in a nano sand mill, and uniformly mixing the raw materials to prepare the ferriteForming ferrite slurry;
step 3, printing the ferrite slurry on a ceramic mobile phone backboard in a screen printing mode, wherein the printing thickness is 15-20 mu m;
step 4, placing the ceramic mobile phone backboard printed with the ferrite slurry in a drying furnace for drying at the temperature of 150-180 ℃ for 20-30min;
step 5, mixing 80g of nano silver powder or gold powder and 20g of borosilicate glass powder according to a proportion, adding organic solvents such as terpineol, methyl cellulose and the like, and sanding for 20-22 hours in a nano sand mill to prepare conductive slurry;
step 6, printing conductive paste on the surface of the ferrite paste finished in the step 4, wherein the printing thickness is 15-20 mu m, and drying according to the conditions that the temperature is 150-180 ℃ and the time is 20-30min;
step 7, after drying, printing and covering the ferrite slurry which is the same as that in the step 2 on the surface of the conductive slurry;
step 8, drying the same conditions as the step 4;
and 9, integrally sintering the ceramic mobile phone rear cover in a high-temperature sintering furnace at 1100-1200 ℃ to ensure that the ferrite slurry and the conductive slurry can be well adhered to the zirconia ceramic backboard.
The foregoing is a further detailed description of the invention in connection with specific/preferred embodiments, and it is not intended that the invention be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the invention, and these alternatives or modifications should be considered to be within the scope of the invention.
Claims (11)
1. The utility model provides a wireless terminal pottery back lid that charges, includes ceramic backplate, its characterized in that still includes to cover in proper order first ferrite layer, conductive pattern layer and the second ferrite layer on the ceramic backplate, conductive pattern layer forms wireless induction coil that charges, first ferrite layer with the second ironThe oxygen layer contains ferrite main raw materials with the following formula: 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 The conductive pattern layer contains 70-80 wt% of noble metal powder, 2-5 wt% of graphene, 3-8 wt% of carbon nano tubes and 15-20wt% of glass, and the first ferrite layer, the second ferrite layer and the conductive pattern layer have the same sintering temperature of 1100-1200 ℃.
2. The wireless charging terminal ceramic back cover of claim 1, wherein the first ferrite layer and the second ferrite layer further comprise 5-8wt% by weight of a glass phase.
3. The wireless charging terminal ceramic rear cover of claim 1, wherein the noble metal powder is nano silver powder or gold powder.
4. The wireless charging terminal ceramic rear cover of claim 1, wherein the first ferrite layer, the conductive pattern layer, and the second ferrite layer each have a thickness of 15-20 μm.
5. The wireless charging terminal ceramic rear cover of any one of claims 1 to 4, wherein the ceramic rear plate is a zirconia ceramic rear plate.
6. A wireless charging terminal having a ceramic rear cover of the wireless charging terminal according to any one of claims 1 to 5.
7. A method for manufacturing the ceramic rear cover of the wireless charging terminal according to any one of claims 1 to 5, comprising the steps of:
s1, printing a layer of ferrite slurry on a ceramic backboard, and drying to form a first ferrite layer;
s2, printing a layer of conductive paste pattern on the first ferrite layer, and drying to form the conductive pattern layer;
s3, printing another layer of ferrite slurry on the conductive pattern layer, and drying to form a second ferrite layer, wherein the second ferrite layer is formed;
s4, sintering the ceramic backboard and the conductive pattern layer integrally at the sintering temperature of 1100-1200 ℃ to form a wireless charging induction coil;
in step S1 and step S3, the first ferrite layer and the second ferrite layer contain ferrite main raw materials adopting the following formulation: 25-30wt% of NiO, 15-20wt% of ZnO and 50-60wt% of Fe 2 O 3 In the step S2, the conductive pattern layer contains 70-80 wt% of noble metal powder, 2-5 wt% of graphene, 3-8 wt% of carbon nano tubes and 15-20wt% of glass.
8. The method for manufacturing a ceramic rear cover of a wireless charging terminal according to claim 7, wherein in the step S1 and the step S3, the ferrite slurry is prepared by uniformly mixing the raw materials, wherein the ferrite slurry comprises the ferrite main raw material, a glass phase accounting for 5-8wt% of the total weight is additionally added, an appropriate amount of organic solvent is added, and then sanding is performed, wherein the baking temperature is 150-180 ℃ and the baking time is 20-30min.
9. The method of claim 8, wherein the organic solvent is selected from terpineol and grade-a cellulose.
10. The method for manufacturing a ceramic rear cover of a wireless charging terminal according to claim 7, 8 or 9, wherein in the step S2, the conductive paste is prepared by adding a proper amount of organic solvent into raw materials comprising the noble metal powder, the graphene, the carbon nanotube and the glass, and then performing sanding, and uniformly mixing the raw materials, wherein the baking temperature is 150-180 ℃ and the baking time is 20-30min.
11. The method for manufacturing a ceramic rear cover of a wireless charging terminal according to claim 10, wherein the noble metal powder is nano silver powder or gold powder, and the organic solvent is selected from terpineol and methylcellulose grade.
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| US10840739B2 (en) | 2018-05-25 | 2020-11-17 | Apple Inc. | Wound housings for electronic devices |
| CN110784023A (en) * | 2018-07-31 | 2020-02-11 | 中兴通讯股份有限公司 | Machine shell and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105163539A (en) * | 2015-09-16 | 2015-12-16 | 东莞劲胜精密组件股份有限公司 | Zirconia ceramic rear cover having wireless charging function and manufacture method thereof |
| CN205122752U (en) * | 2015-10-19 | 2016-03-30 | 上海蓝沛信泰光电科技有限公司 | Ultra -thin coil module and use its electronic equipment |
| CN106663524A (en) * | 2014-05-30 | 2017-05-10 | 康宁股份有限公司 | Wireless charging device for an electronic device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106663524A (en) * | 2014-05-30 | 2017-05-10 | 康宁股份有限公司 | Wireless charging device for an electronic device |
| CN105163539A (en) * | 2015-09-16 | 2015-12-16 | 东莞劲胜精密组件股份有限公司 | Zirconia ceramic rear cover having wireless charging function and manufacture method thereof |
| CN205122752U (en) * | 2015-10-19 | 2016-03-30 | 上海蓝沛信泰光电科技有限公司 | Ultra -thin coil module and use its electronic equipment |
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