CN117326802A - Ceramic material and preparation method and application thereof - Google Patents
Ceramic material and preparation method and application thereof Download PDFInfo
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- CN117326802A CN117326802A CN202310390761.1A CN202310390761A CN117326802A CN 117326802 A CN117326802 A CN 117326802A CN 202310390761 A CN202310390761 A CN 202310390761A CN 117326802 A CN117326802 A CN 117326802A
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- 229910010293 ceramic material Inorganic materials 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 35
- 239000013078 crystal Substances 0.000 claims description 24
- 238000013003 hot bending Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 6
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- WVMPCBWWBLZKPD-UHFFFAOYSA-N dilithium oxido-[oxido(oxo)silyl]oxy-oxosilane Chemical compound [Li+].[Li+].[O-][Si](=O)O[Si]([O-])=O WVMPCBWWBLZKPD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000003426 chemical strengthening reaction Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005342 ion exchange Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 235000010344 sodium nitrate Nutrition 0.000 claims description 3
- 239000004317 sodium nitrate Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 238000005034 decoration Methods 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 28
- 239000011148 porous material Substances 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- HEHRHMRHPUNLIR-UHFFFAOYSA-N aluminum;hydroxy-[hydroxy(oxo)silyl]oxy-oxosilane;lithium Chemical compound [Li].[Al].O[Si](=O)O[Si](O)=O.O[Si](=O)O[Si](O)=O HEHRHMRHPUNLIR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052670 petalite Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
- C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
- C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/005—Compositions for glass with special properties for opaline glass
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
-
- 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
- H04M1/026—Details of the structure or mounting of specific components
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2204/00—Glasses, glazes or enamels with special properties
- C03C2204/04—Opaque glass, glaze or enamel
- C03C2204/06—Opaque glass, glaze or enamel opacified by gas
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Dispersion Chemistry (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
Abstract
The invention discloses a ceramic material, a preparation method and application thereof, wherein the transmissivity of the ceramic material in a visible light wave band is 5% -65%, the L value of a Lab value is 50-100, the a value is-5 to +5, and the b value is-5 to +15; the haze is more than or equal to 50%; density is between 2.3g/cm 3 ‑2.7g/cm 3 The relative dielectric constant is 5-6. The zirconia ceramic can be used as a back plate of a mobile phone back plate or a back plate of a wearable device or a touch pad of a notebook computer or a back plate of a tablet computer instead of zirconia ceramic.
Description
Technical Field
The invention belongs to the field of special ceramic materials, and particularly relates to a ceramic material, and a preparation method and application thereof.
Background
In the background of the 21 st century, design materials for terminals such as mobile phones and notebooks need to meet the requirement of reducing the shielding of electromagnetic signals as much as possible, have excellent anti-falling performance, and simultaneously require beautiful appearance, for example, a mobile phone backboard generally adopts plastic, glass or zirconia ceramics, wherein the zirconia ceramics are the highest materials in the prior art, are favored by people in terms of texture like jade and anti-falling performance and pure white, but at the same time, people are also urgently searching for other materials, and can better improve the anti-falling performance of the zirconia ceramics, reduce the dielectric constant of the zirconia ceramics as much as possible, reduce the material cost and reduce the weight of the materials.
Disclosure of Invention
In order to find a substitute material with similar appearance to zirconia ceramics, provide better anti-falling performance, reduce dielectric constant as much as possible, reduce material cost and material weight, the invention provides a ceramic material, and a preparation method and application thereof, and the specific technical scheme is as follows:
a ceramic material having a transmittance of 5% -65% in the visible light band, an L value of 50-100, an a value of-5 to +5, and a b value of-5 to +15; the haze is more than or equal to 50%; density is between 2.3g/cm 3 -2.7g/cm 3 The relative dielectric constant is 5-6.
Furthermore, the ceramic material has crystal types of lithium disilicate and lithium aluminosilica, the crystallinity is more than or equal to 90%, the crystal size is 90-400nm, and the crystal morphology is in a pore spheroid shape.
Furthermore, the fracture toughness of the material is more than or equal to 2MPa multiplied by m 1/2 。
Preferably, the ceramic material consists of 67-73wt% SiO 2 ，5-9wt%Al 2 O 3 ，0-1wt%TiO 2 ,0-1wt%CaO ，9-13wt%Li 2 O ，0.1-1.5wt%Na 2 O ，0.1-1wt%K 2 O ， 3-6wt%P 2 O 5 ，3-9wt%ZrO 2 0-1wt% BaO,0-3wt% MgO,0-2wt% ZnO and 0-2wt% Sb 2 O 3 Is prepared through high-temperature melting annealing and hot bending treatment.
A method for preparing a ceramic material, comprising the steps of:
step 1:67-73wt% SiO 2 ，5-9wt%Al 2 O 3 ，0-1wt%TiO 2 ,0-1wt%CaO ，9-13wt%Li 2 O ，0.1-1.5wt%Na 2 O ，0.1-1wt%K 2 O ， 3-6wt%P 2 O 5 ，3-9wt%ZrO 2 0-1wt% BaO,0-3wt% MgO,0-2wt% ZnO and 0-2wt% Sb 2 O 3 Uniformly mixing, putting the mixture into a platinum crucible for 4 to 8 times, melting the mixture at 1300 to 1650 ℃ for 30 hours, and pouring the mixture for molding;
step 2: putting the block cast in the step 1 into an annealing furnace, preserving heat for 24 hours at 500 ℃, cooling to room temperature along with the furnace at a cooling rate of 30 ℃/min after 5 hours, and taking out and cutting into slices;
step 3: placing the flaky material obtained in the step 2 into a crystallization furnace at room temperature, heating to 600-1000 ℃ with a gradient of 1-20 ℃/min, preserving heat at 600-1000 ℃ for 30-180min, cooling to room temperature with a cooling rate of 10-30 ℃/min after the heat preservation is finished, and taking out;
step 4: performing CNC (computer numerical control) and polishing and edge sweeping treatment on the ceramic sheet obtained in the step 3;
step 5: placing the ceramic sheet obtained in the step 4 into a 2D or 3D graphite mold, placing the graphite mold filled with the ceramic sheet into a hot bending machine for hot bending, heating the hot bending machine to 700-900 ℃ according to the heating rate of 30-100 ℃/min, keeping the temperature of 700-900 ℃ for 5-30min, cooling to room temperature according to the cooling rate of 50-100 ℃/min, and taking out the ceramic sheetAnd polishing the obtained ceramic plate to obtain a target product, and finishing the second-stage heat treatment crystal growth while the ceramic plate realizes the 3D appearance. The method combines the traditional two-step method of nucleation and then crystal growth into one step, the invention increases the ratio of zirconia in the raw material composition, and the zirconia is a good nucleating agent, thus the overlapping area of the temperature interval of nucleation and the temperature interval of crystal growth is larger, the nucleation and crystal growth process can be completed in one step, the production cost is saved, and the transmittance of the ceramic material treated by the step is that5-65The crystallinity reaches more than 89%;
preferably, the mold used in the step 5 is a graphite mold, the graphite mold is oxidized at 700-900 ℃, nitrogen is filled into a hot bending furnace of a hot bending machine, the oxidation of the graphite mold is avoided, and a high-temperature-resistant boron nitride mold is not used in the step; meanwhile, a single sheet is adopted for heat treatment, a scheme of lamination is not adopted, a boron nitride release agent is not used, substances which are generated by boron oxide through thermal decomposition at high temperature are prevented from penetrating into glass to influence the growth of crystal grains, the crystal growth of the ceramic master blank cannot react with a die material or a release agent material, so that the crystal grain size is smaller at the temperature and time of the heat treatment, and the crystal morphology is still similar to that of a sphere because of the small-size stage formed by lithium disilicate and lithium aluminum silica crystals; particularly, during the hot bending treatment in the step, nitrogen is continuously filled into a hot bending machine to prevent oxidation of a graphite mold, and the pressure in the cavity of the hot bending machine is maintained at a positive pressure of 0.01-0.02Mpa; the graphite mold is pressed during the heat bending treatment at 700-900 ℃ with the pressure value of 0.1-1Mpa.
Preferably, the method further comprises step 6: and (3) placing the ceramic sheet obtained in the step (5) into strengthening salt containing potassium nitrate, sodium nitrate and lithium nitrate, and carrying out heat preservation for 3-5h at 400-500 ℃ for ion exchange and chemical strengthening.
Further, the method also comprises the step 7: and (3) carrying out surface decoration on the ceramic sheet obtained in the step (6).
The ceramic material is used as a back plate of a mobile phone or a back plate of a wearable device or a touch pad of a notebook computer or a back plate of a tablet computer.
67-73wt% SiO is used in the present invention 2 ，5-9wt%Al 2 O 3 ，0-1wt%TiO 2 ,0-1wt%CaO ，9-13wt%Li 2 O ，0.1-1.5wt%Na 2 O ，0.1-1wt%K 2 O ， 3-6wt%P 2 O 5 ，3-9wt%ZrO 2 0-1wt% BaO,0-3wt% MgO,0-2wt% ZnO and 0-2wt% Sb 2 O 3 As a raw material, heat treatment is fused in a hot bending treatment step, a ceramic material taking petalite and lithium disilicate as main crystal phases is formed in a ceramic body, the morphology of crystals is in a spherical shape with holes, and the crystals in the spherical shape enable microcracks in the ceramic to be transformed in the direction of microcracks when encountering the crystals during expansion, so that the kinetic energy for further expanding the microcracks is reduced. The size of the crystal is between 90 and 400nm, meanwhile, the large crystal and the small crystal grow into a whole in the growing process, because the shape of the single crystal is similar to a sphere, pores are formed at the boundary of the sphere and the sphere, and the size of the pores is between 1 and 5nm, so that the density of the whole material is further reduced due to the existence of the pores; on the other hand, the crystal with the size of 90-400nm is overlapped with 380-780nm wave band of visible light to a certain extent, and light can be effectively shielded and passed, so that the white anti-drop ceramic with the transmittance of 5% -65% is formed.
Meanwhile, the ceramic material has low relative molecular mass and density of 2.3g/cm compared with zirconia ceramic 3 -2.7g/cm 3 5g/cm compared to zirconia ceramics 3 -6g/cm 3 And the weight is lighter.
The ceramic material has the beneficial technical effects that the transmissivity of the ceramic material in a visible light wave band is 5% -65%, the L value of the Lab value is 50-100, the a value is-5 to +5, and the b value is-5 to +15; the haze is more than or equal to 50%; density is between 2.3g/cm 3 -2.7g/cm 3 The relative dielectric constant is 5-6, and the fracture toughness is more than or equal to 2MPa multiplied by m 1/2 Density of 2.3g/cm 3 -2.7g/cm 3 The zirconia ceramic can be used as a back plate of a mobile phone back plate or a back plate of a portable computer or a touch pad of a notebook computer or a back plate of a tablet computer instead of zirconia ceramic.
Drawings
FIG. 1 is an SEM photograph of a ceramic material obtained in example 1 of the present invention;
FIG. 2 is an SEM photograph of the ceramic material obtained in example 2 of the present invention.
Detailed Description
Examples
The first step: 71wt% SiO 2 ，9wt%Al 2 O 3 The 0.05wt%CaO, 11.71wt%Li2O, 0.2wt%Na2O, 0.5wt%K2O, 1wt%P2O5,6wt%ZrO2, 0.03wt%BaO,0.51wt%MgO powder is firstly and uniformly mixed, then is put into a platinum crucible for a plurality of times, and is poured and molded after being melted for 30 hours at the temperature of 1300-1650 ℃;
and a second step of: placing the poured and formed lump materials into an annealing furnace within 3min, preserving heat for 24h at 500 ℃ for annealing treatment, cooling to room temperature along with the furnace at 30 ℃ per minute along with the furnace after 5h, and taking out;
and a third step of: cutting the extracted block into slices of 90 x 180 x 0.7mm by a wire;
fourth step: placing the flaky material obtained in the third step into a crystallization furnace at room temperature, heating to a set temperature of 600 ℃ with a gradient of 1 ℃/min, then preserving heat at the set temperature for 30min, cooling to room temperature with a cooling rate of 10 ℃/min after the heat preservation is finished, and taking out;
fifth step: CNC, polishing and edge sweeping treatment are carried out on the ceramic sheet obtained in the fourth step according to the required size and shape;
sixth step: placing the ceramic sheet obtained in the fifth step into a 3D graphite mold, placing the graphite mold with the ceramic sheet into a hot bending machine for hot bending, heating the hot bending machine to 700 ℃ according to the heating rate of 30 ℃/min, keeping the temperature at 700 ℃ for 5min, cooling to room temperature according to the cooling rate of 50 ℃/min, taking out, and completing the second-stage heat treatment while realizing the appearance of the mold;
seventh step: performing further polishing treatment on the ceramic obtained in the sixth step to throw off stamping and pits caused by hot bending;
eighth step: and (3) placing the ceramic material obtained in the seventh step into strengthening salt containing potassium nitrate, sodium nitrate and lithium nitrate, preserving the temperature for 4 hours at 450 ℃ for ion exchange, and carrying out chemical strengthening to obtain a final product.
The experimental parameters and test results for examples 1-7 are shown in the following table.
Claims (9)
1. The preparation method of the ceramic material is characterized by comprising the following steps:
step 1:67-73wt% SiO 2 ，7.5-9wt%Al 2 O 3 ，0.05wt%CaO ，11.71-12.21wt%Li 2 O ，0.2wt%Na 2 O ，0.5wt%K 2 O ， 1wt%P 2 O 5 ，6wt%ZrO 2 Uniformly mixing 0.03wt% of BaO and 0.01-0.51wt% of MgO, sequentially putting the mixture into a platinum crucible for 4-8 times to ensure full uniform melting, preserving heat for 30h at 1300-1650 ℃ to melt, and pouring and molding;
step 2: putting the block cast in the step 1 into an annealing furnace, preserving heat for 24 hours at 500 ℃, cooling to room temperature along with the furnace at a cooling rate of 30 ℃/min, and taking out and cutting into slices;
step 3: placing the flaky material obtained in the step 2 into a crystallization furnace at room temperature, heating to 600-800 ℃ with a gradient of 1-15 ℃/min, preserving heat at 600-800 ℃ for 30-90min, cooling to room temperature with a cooling rate of 10-25 ℃/min after the heat preservation is finished, and taking out;
step 4: performing CNC (computer numerical control) and polishing and edge sweeping treatment on the ceramic sheet obtained in the step 3;
step 5: placing the ceramic sheet obtained in the step 4 into a 2D or 3D graphite mold, placing the graphite mold filled with the ceramic sheet into a hot bending machine for hot bending, heating the hot bending machine to 700-850 ℃ according to the heating rate of 30-60 ℃/min, keeping the temperature at 700-850 ℃ for 5-15min, cooling the ceramic sheet to room temperature according to the cooling rate of 50-80 ℃/min, taking out the ceramic sheet, polishing the obtained ceramic sheet to obtain a target product, wherein the transmittance of the ceramic material in the visible light wave band is 5-65%, the L value of Lab value is 50-100, the a value is-5 to +5, and the b value is-5 to +15; the haze is more than or equal to 50%; density is between 2.3g/cm 3 -2.7g/cm 3 The relative dielectric constant is 5-6.
2. The method for producing a ceramic material according to claim 1, further comprising step 6: and (3) placing the ceramic sheet obtained in the step (5) into strengthening salt containing potassium nitrate, sodium nitrate and lithium nitrate, and carrying out heat preservation for 3-5h at 400-500 ℃ for ion exchange and chemical strengthening.
3. The method for producing a ceramic material according to claim 2, further comprising step 7: and (3) carrying out surface decoration on the ceramic sheet obtained in the step (6).
4. The method for preparing ceramic material according to claim 1, wherein in step 5, during the hot bending treatment, nitrogen is continuously charged into the hot bending machine to prevent oxidation of the graphite mold, and the furnace chamber of the hot bending machine should be continuously maintained at a positive pressure with a pressure value of 0.01-0.02Mpa; the graphite mold is pressurized during the heat bending treatment at 700-900 deg.c with the pressure value of 0.1-1Mpa.
5. A ceramic material produced according to the method of claim 1, characterized in that it has a transmittance of 60% to 65% in the visible band, an L value of 84-100, an a value of-0.05 to +2, and a b value of-5 to +9; the haze is more than or equal to 50%; density is between 2.4g/cm 3 -2.7g/cm 3 The relative dielectric constant is 5.5-5.6.
6. The ceramic material according to claim 5, wherein the crystal types of the material are lithium disilicate and lithium aluminosilica, the crystallinity is not less than 90%, the crystal size is 90-150nm, and the crystal morphology is spheroid.
7. A ceramic material according to claim 5 or 6, characterized in that the fracture toughness of the material is not less than 2MPa x m 1/2 。
8. The ceramic material according to claim 7, further characterized by being composed of 67-73wt% SiO 2 ，7.5-9wt%Al 2 O 3 ，0.05wt%CaO ，11.71-12.21wt%Li 2 O ，0.2wt%Na 2 O ，0.5wt%K 2 O ， 1wt%P 2 O 5 ，6wt%ZrO 2 0.03wt% BaO and 0.01-0.51wt% MgO are subjected to high temperature melting annealing and then subjected to hot bending treatment.
9. Use of the ceramic material of claim 5 or 6 or 8 as a back-plate for a mobile phone or a back-plate for a wearable device or a notebook or tablet back-plate.
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