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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- 239000000919 ceramic Substances 0.000 title claims abstract description 77
- 238000005516 engineering process Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 23
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 238000000498 ball milling Methods 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 13
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 28
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 24
- 238000001354 calcination Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 11
- 238000005498 polishing Methods 0.000 claims description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 claims description 5
- 229910006251 ZrOCl2.8H2O Inorganic materials 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 239000012716 precipitator Substances 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- DEXZEPDUSNRVTN-UHFFFAOYSA-K yttrium(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[Y+3] DEXZEPDUSNRVTN-UHFFFAOYSA-K 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 229910052594 sapphire Inorganic materials 0.000 abstract description 5
- 239000010980 sapphire Substances 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000005240 physical vapour deposition Methods 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 239000002932 luster Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000011257 shell material Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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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
- C04B35/62605—Treating the starting powders individually or as mixtures
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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
- C04B35/64—Burning or sintering processes
-
- 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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- 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
- 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
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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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
- C04B2235/443—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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
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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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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5420086A (en) * | 1991-05-09 | 1995-05-30 | Nukem Gmbh | Method for producing stabilized zirconium oxide powder |
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