CN111574222A - Technology for preparing ceramic rear cover through grouting - Google Patents
Technology for preparing ceramic rear cover through grouting Download PDFInfo
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- CN111574222A CN111574222A CN202010416416.7A CN202010416416A CN111574222A CN 111574222 A CN111574222 A CN 111574222A CN 202010416416 A CN202010416416 A CN 202010416416A CN 111574222 A CN111574222 A CN 111574222A
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- 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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- 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
- C04B35/62605—Treating the starting powders individually or as mixtures
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- 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
- C04B35/64—Burning or sintering processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/443—Nitrates or nitrites
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
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Abstract
The invention discloses a process for preparing a ceramic rear cover by grouting, which comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water; placing the raw materials in a ball mill for ball milling; after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry; injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould; vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness; putting the green body into a sintering furnace for sintering; the invention has the beneficial effects that: the zirconium oxide powder is used as a raw material of the ceramic mobile phone rear cover, so that the yield, the falling resistance and the wear resistance of the ceramic mobile phone rear cover are improved; the green body is placed into a sintering furnace to be sintered for 1-3h at 1800-2200 ℃, which is beneficial to reducing air holes in the formed body, enhancing the combination among particles and improving the mechanical strength, thereby obtaining the formed ceramic sintered part with the hardness which is comparable to that of the sapphire.
Description
Technical Field
The invention belongs to the technical field of ceramic rear covers, and particularly relates to a process for preparing a ceramic rear cover by grouting.
Background
Grouting, ceramic process grouting and building engineering grouting. The ceramic process grouting is a process for applying prepared mud grouting to ceramic production; the construction engineering is a method of injecting some curable slurry into cracks or pores of the geotechnical ground by proper method, and improving the physical and mechanical properties by means of replacement, filling, extrusion and the like.
The 'white jade, light mirror, thin paper and sound chime' are true pictures of ancient people on the ceramic, and as the age of 5G comes, the ceramic is also receiving attention of more and more people as a novel mobile phone shell material.
Compared with a 3D glass mobile phone shell, the ceramic mobile phone shell has the problems of high cost and low yield at present.
In order to reduce cost and improve yield, a process for preparing a ceramic rear cover by grouting is provided for the purpose.
Disclosure of Invention
The invention aims to provide a process for preparing a ceramic rear cover by grouting, which reduces the cost and improves the yield.
In order to achieve the purpose, the invention provides the following technical scheme: a technology for preparing a ceramic rear cover by grouting comprises the following steps:
the method comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water;
step two: placing the raw materials in the step one in a ball mill for ball milling;
step three: after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry;
step four: injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould;
step five: vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness;
step six: putting the green body into a sintering furnace for sintering;
step seven: and grinding and polishing after sintering, and carrying out CNC machining, laser, PVD and AF treatment to obtain a finished product of the ceramic rear cover.
As a preferred technical solution of the present invention, the zirconia powder preparation process is as follows:
the method comprises the following steps: using alkali liquor as a precipitator (controlling the pH value), precipitating hydrous zirconium oxide Zr (OH)4 (zirconium hydroxide gel) and Y (OH)3 (yttrium hydroxide gel) from ZrOCl2.8H2O or Zr (NO3)4 and Y (NO3)3 (serving as stabilizers) salt solution;
step two: the zirconium oxide powder is prepared by the procedures of filtering, washing, drying and calcining.
As a preferable technical scheme of the invention, the alkali liquor is one of sodium hydroxide, potassium hydroxide and ammonia water.
In a preferred embodiment of the present invention, the pH is 8 to 9.
As a preferred technical scheme of the invention, the zirconia powder is prepared by the procedures of filtering, washing, drying and calcining, and the calcining temperature is 550-850 ℃.
As a preferred technical scheme of the invention, the raw materials are put into a ball mill for ball milling for 20-28 h.
As a preferable technical proposal of the invention, the green body is put into a sintering furnace to be sintered for 1 to 3 hours at 1800-2200 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the zirconium oxide powder is used as a raw material of the ceramic mobile phone rear cover, so that the yield, the falling resistance and the wear resistance of the ceramic mobile phone rear cover are improved;
(2) the green body is placed into a sintering furnace to be sintered for 1-3h at 1800-2200 ℃, which is beneficial to reducing air holes in the formed body, enhancing the combination among particles and improving the mechanical strength, thereby obtaining the formed ceramic sintered part with the hardness which is comparable to that of the sapphire.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a technical solution: a technology for preparing a ceramic rear cover by grouting comprises the following steps:
the method comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water;
step two: placing the raw materials in the step one in a ball mill for ball milling for 20 hours;
step three: after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry;
step four: injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould;
step five: vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness;
step six: the green body is put into a sintering furnace to be sintered for 3 hours at 1800 ℃, so that air holes in the formed body are reduced, the combination among particles is enhanced, and the mechanical strength is improved, thereby obtaining a formed ceramic sintered part with the hardness comparable to that of sapphire;
step seven: after sintering, grinding and polishing, and carrying out CNC (computer numerical control) machining, laser, PVD (physical vapor deposition) and AF (automatic frequency control) processing to obtain a finished product of the ceramic rear cover; the mechanism of material stripping in the grinding process of ceramics mainly comprises rolling and crushing, wherein the polishing is to rub the surface of a workpiece by using a micro-abrasive particle elastoplastic polishing machine and the like to generate plastic flow on the surface of the workpiece and generate fine cuttings; the ceramic CNC processing is mainly used for trimming the machine body, the curve of the machine body of the mobile phone is softer, the appearance is more comfortable, the brittle peeling of the material is completed by the forming of gaps and cracks or the modes of extension, peeling, fragmentation and the like in the ceramic grinding process, and because the microcrystalline nano zirconia ceramic is hard, the surface processing or diamond CNC cutting tool processing is needed; and (3) performing surface post-treatment by laser, PVD and AF to finally obtain the mobile phone ceramic body with uniform crystal structure and glittering and dazzling luster.
In this embodiment, preferably, the preparation process of the zirconia powder is as follows:
the method comprises the following steps: using alkali liquor as a precipitator (controlling the pH to be 8), precipitating hydrous zirconium oxide Zr (OH)4 (zirconium hydroxide gel) and Y (OH)3 (yttrium hydroxide gel) from ZrOCl2.8H2O or Zr (NO3)4 and Y (NO3)3 (serving as stabilizers) salt solution; the alkali liquor is sodium hydroxide;
step two: filtering, washing, drying and calcining to obtain zirconium oxide powder; the temperature of calcination was 550 ℃.
The zirconia powder is used as a raw material of the ceramic mobile phone rear cover, and is beneficial to improving the yield, the falling resistance and the wear resistance of the ceramic mobile phone rear cover.
Example 2
Referring to fig. 1, the present invention provides a technical solution: a technology for preparing a ceramic rear cover by grouting comprises the following steps:
the method comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water;
step two: putting the raw materials in the step one into a ball mill for ball milling for 24 hours;
step three: after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry;
step four: injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould;
step five: vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness;
step six: the green body is placed into a sintering furnace to be sintered for 2 hours at 2000 ℃, so that air holes in the formed body are reduced, the combination among particles is enhanced, and the mechanical strength is improved, thereby obtaining a formed ceramic sintered part with the hardness comparable to that of sapphire;
step seven: after sintering, grinding and polishing, and carrying out CNC (computer numerical control) machining, laser, PVD (physical vapor deposition) and AF (automatic frequency control) processing to obtain a finished product of the ceramic rear cover; the mechanism of material stripping in the grinding process of ceramics mainly comprises rolling and crushing, wherein the polishing is to rub the surface of a workpiece by using a micro-abrasive particle elastoplastic polishing machine and the like to generate plastic flow on the surface of the workpiece and generate fine cuttings; the ceramic CNC processing is mainly used for trimming the machine body, the curve of the machine body of the mobile phone is softer, the appearance is more comfortable, the brittle peeling of the material is completed by the forming of gaps and cracks or the modes of extension, peeling, fragmentation and the like in the ceramic grinding process, and because the microcrystalline nano zirconia ceramic is hard, the surface processing or diamond CNC cutting tool processing is needed; and (3) performing surface post-treatment by laser, PVD and AF to finally obtain the mobile phone ceramic body with uniform crystal structure and glittering and dazzling luster.
In this embodiment, preferably, the preparation process of the zirconia powder is as follows:
the method comprises the following steps: using alkali liquor as a precipitator (controlling the pH to be 8.5), precipitating hydrous zirconium oxide Zr (OH)4 (zirconium hydroxide gel) and Y (OH)3 (yttrium hydroxide gel) from ZrOCl2.8H2O or Zr (NO3)4 and Y (NO3)3 (serving as stabilizers) salt solutions; the alkali liquor is potassium hydroxide;
step two: filtering, washing, drying and calcining to obtain zirconium oxide powder; the temperature of the calcination is 550-850 ℃.
The zirconia powder is used as a raw material of the ceramic mobile phone rear cover, and is beneficial to improving the yield, the falling resistance and the wear resistance of the ceramic mobile phone rear cover.
Example 3
Referring to fig. 1, the present invention provides a technical solution: a technology for preparing a ceramic rear cover by grouting comprises the following steps:
the method comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water;
step two: putting the raw materials in the step one into a ball mill for ball milling for 20-28 h;
step three: after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry;
step four: injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould;
step five: vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness;
step six: the green body is put into a sintering furnace to be sintered for 1h at 2200 ℃, so that air holes in the formed body are reduced, the combination among particles is enhanced, and the mechanical strength is improved, thereby obtaining a formed ceramic sintered part with the hardness being comparable to that of sapphire;
step seven: after sintering, grinding and polishing, and carrying out CNC (computer numerical control) machining, laser, PVD (physical vapor deposition) and AF (automatic frequency control) processing to obtain a finished product of the ceramic rear cover; the mechanism of material stripping in the grinding process of ceramics mainly comprises rolling and crushing, wherein the polishing is to rub the surface of a workpiece by using a micro-abrasive particle elastoplastic polishing machine and the like to generate plastic flow on the surface of the workpiece and generate fine cuttings; the ceramic CNC processing is mainly used for trimming the machine body, the curve of the machine body of the mobile phone is softer, the appearance is more comfortable, the brittle peeling of the material is completed by the forming of gaps and cracks or the modes of extension, peeling, fragmentation and the like in the ceramic grinding process, and because the microcrystalline nano zirconia ceramic is hard, the surface processing or diamond CNC cutting tool processing is needed; and (3) performing surface post-treatment by laser, PVD and AF to finally obtain the mobile phone ceramic body with uniform crystal structure and glittering and dazzling luster.
In this embodiment, preferably, the preparation process of the zirconia powder is as follows:
the method comprises the following steps: using alkali liquor as a precipitator (controlling the pH to be 9), precipitating hydrous zirconium oxide Zr (OH)4 (zirconium hydroxide gel) and Y (OH)3 (yttrium hydroxide gel) from ZrOCl2.8H2O or Zr (NO3)4 and Y (NO3)3 (serving as stabilizers) salt solutions; the alkali liquor is ammonia water;
step two: filtering, washing, drying and calcining to obtain zirconium oxide powder; the temperature of calcination was 850 ℃.
The zirconia powder is used as a raw material of the ceramic mobile phone rear cover, and is beneficial to improving the yield, the falling resistance and the wear resistance of the ceramic mobile phone rear cover.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A technology for preparing a ceramic rear cover by grouting is characterized in that: the preparation process comprises the following steps:
the method comprises the following steps: preparing raw materials: zirconium oxide powder, organic alkali tetramethyl ammonium hydroxide and deionized water;
step two: placing the raw materials in the step one in a ball mill for ball milling;
step three: after ball milling, adding ammonium persulfate into the mixture for defoaming treatment to obtain ceramic slurry;
step four: injecting ceramic slurry into a cavity of the microporous mould from an injection opening of the microporous mould;
step five: vacuumizing, discharging the water in the cavity, and demolding when the ceramic rear cover green body in the micropore mold is molded to a preset thickness;
step six: putting the green body into a sintering furnace for sintering;
step seven: and grinding and polishing after sintering, and carrying out CNC machining, laser, PVD and AF treatment to obtain a finished product of the ceramic rear cover.
2. The process for preparing the ceramic rear cover by grouting according to claim 1, wherein the process comprises the following steps: the preparation process of the zirconium oxide powder comprises the following steps:
the method comprises the following steps: using alkali liquor as a precipitator (controlling the pH value), precipitating hydrous zirconium oxide Zr (OH)4 (zirconium hydroxide gel) and Y (OH)3 (yttrium hydroxide gel) from ZrOCl2.8H2O or Zr (NO3)4 and Y (NO3)3 (serving as stabilizers) salt solution;
step two: the zirconium oxide powder is prepared by the procedures of filtering, washing, drying and calcining.
3. The process for preparing the ceramic rear cover by grouting according to claim 2, wherein: the alkali liquor is one of sodium hydroxide, potassium hydroxide and ammonia water.
4. The process for preparing the ceramic rear cover by grouting according to claim 2, wherein: the pH is 8-9.
5. The process for preparing the ceramic rear cover by grouting according to claim 2, wherein: the zirconia powder is prepared by the procedures of filtering, washing, drying and calcining, and the calcining temperature is 550-850.
6. The process for preparing the ceramic rear cover by grouting according to claim 1, wherein the process comprises the following steps: the raw materials are put into a ball mill for ball milling for 20-28 h.
7. The process for preparing the ceramic rear cover by grouting according to claim 1, wherein the process comprises the following steps: the green body is put into a sintering furnace to be sintered for 1-3h at 1800-2200 ℃.
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| US5420086A (en) * | 1991-05-09 | 1995-05-30 | Nukem Gmbh | Method for producing stabilized zirconium oxide powder |
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| CN107696235A (en) * | 2017-09-20 | 2018-02-16 | 中山市华通达陶瓷科技有限公司 | A kind of molding method for preparing of zirconia ceramics cell phone rear cover |
| CN107914333A (en) * | 2017-12-18 | 2018-04-17 | 湖南正阳精密陶瓷有限公司 | The method that zirconia ceramics cell phone rear cover is made using gel injection molding and forming technology |
| CN108000684A (en) * | 2017-12-18 | 2018-05-08 | 湖南正阳精密陶瓷有限公司 | A kind of adhesive for powder injection forming preparation method and applications |
| CN108727015A (en) * | 2018-06-12 | 2018-11-02 | 佛山市华强协兴陶瓷有限公司 | A kind of zirconium oxide base metal-ceramic material preparation method |
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2020
- 2020-05-17 CN CN202010416416.7A patent/CN111574222A/en active Pending
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| US5420086A (en) * | 1991-05-09 | 1995-05-30 | Nukem Gmbh | Method for producing stabilized zirconium oxide powder |
| 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 |
| CN107696235A (en) * | 2017-09-20 | 2018-02-16 | 中山市华通达陶瓷科技有限公司 | A kind of molding method for preparing of zirconia ceramics cell phone rear cover |
| CN107914333A (en) * | 2017-12-18 | 2018-04-17 | 湖南正阳精密陶瓷有限公司 | The method that zirconia ceramics cell phone rear cover is made using gel injection molding and forming technology |
| CN108000684A (en) * | 2017-12-18 | 2018-05-08 | 湖南正阳精密陶瓷有限公司 | A kind of adhesive for powder injection forming preparation method and applications |
| CN108727015A (en) * | 2018-06-12 | 2018-11-02 | 佛山市华强协兴陶瓷有限公司 | A kind of zirconium oxide base metal-ceramic material preparation method |
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| Title |
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| 周书助: "《硬质材料与工具》", 31 August 2015, 冶金工业出版社 * |
| 蓝海凤等: "精细陶瓷在智能手机上的应用及其制备工艺", 《陶瓷》 * |
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Application publication date: 20200825 |
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| RJ01 | Rejection of invention patent application after publication |