CN113816600A - Glass composition, lanthanide glass, preparation method and application of lanthanide glass, and lanthanide glass wafer - Google Patents
Glass composition, lanthanide glass, preparation method and application of lanthanide glass, and lanthanide glass wafer Download PDFInfo
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- CN113816600A CN113816600A CN202111016244.5A CN202111016244A CN113816600A CN 113816600 A CN113816600 A CN 113816600A CN 202111016244 A CN202111016244 A CN 202111016244A CN 113816600 A CN113816600 A CN 113816600A
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- 239000011521 glass Substances 0.000 title claims abstract description 255
- 229910052747 lanthanoid Inorganic materials 0.000 title claims abstract description 91
- 150000002602 lanthanoids Chemical class 0.000 title claims abstract description 91
- 239000000203 mixture Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 60
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 36
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 32
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 32
- 229910052681 coesite Inorganic materials 0.000 claims description 30
- 229910052906 cristobalite Inorganic materials 0.000 claims description 30
- 239000000377 silicon dioxide Substances 0.000 claims description 30
- 229910052682 stishovite Inorganic materials 0.000 claims description 30
- 229910052905 tridymite Inorganic materials 0.000 claims description 30
- 238000002844 melting Methods 0.000 claims description 23
- 230000008018 melting Effects 0.000 claims description 21
- 239000006025 fining agent Substances 0.000 claims description 20
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 19
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000002425 crystallisation Methods 0.000 claims description 16
- 230000008025 crystallization Effects 0.000 claims description 16
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 13
- 229910001510 metal chloride Inorganic materials 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 229910001512 metal fluoride Inorganic materials 0.000 claims description 6
- 229910052976 metal sulfide Inorganic materials 0.000 claims description 6
- 239000006060 molten glass Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000003190 augmentative effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 16
- 239000006185 dispersion Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 description 13
- 239000005304 optical glass Substances 0.000 description 9
- 235000012431 wafers Nutrition 0.000 description 9
- 238000010998 test method Methods 0.000 description 6
- 238000007496 glass forming Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000007545 Vickers hardness test Methods 0.000 description 2
- LJCFOYOSGPHIOO-UHFFFAOYSA-N antimony pentoxide Chemical compound O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 description 2
- 229910001626 barium chloride Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 238000007507 annealing of glass Methods 0.000 description 1
- 229910000413 arsenic oxide Inorganic materials 0.000 description 1
- 229960002594 arsenic trioxide Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 thermal stability Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Glass Compositions (AREA)
Abstract
The invention relates to the technical field of glass manufacturing, in particular to a glass composition, lanthanide glass, a preparation method and application thereof, and a lanthanide glass wafer. The lanthanide series glass prepared by the glass composition has the comprehensive properties of high refractive index, low dispersion, low density, high mechanical strength, heat stability and chemical stability at the same time by limiting the specific content of each component in the composition and the mutual synergistic action among the components.
Description
Technical Field
The invention relates to the technical field of glass manufacturing, in particular to a glass composition, lanthanide glass, a preparation method and application thereof, and a lanthanide glass wafer.
Background
Refraction of existing ordinary glassThe rate is about 1.5 generally, and the optical waveguide substrate cannot be used for optical waveguide substrates on wearable glasses such as augmented reality and mixed reality; the viscosity curve of the prior glass in a forming temperature range is very steep, is not beneficial to forming operation, and simultaneously the specific gravity of the glass is large and exceeds 4.5g/cm3And is not favorable for the development trend of light and thin products. In addition, the fining agent used in the prior glass contains harmful components such as arsenic oxide, antimony pentoxide and the like, and the exhaust gas discharged in the glass melting process is harmful to the environment and health.
Therefore, a lanthanide glass having a high refractive index, low dispersion, low density, high mechanical strength, thermal stability, and chemical stability is needed.
Disclosure of Invention
The invention aims to overcome the problems of low refractive index, high specific gravity, high dispersion, unstable hot forming performance, easy crystallization, harmful waste gas release in the glass melting process and the like of the existing glass, and provides a novel glass composition, lanthanide glass, a preparation method and application thereof, and a lanthanide glass wafer, wherein the lanthanide glass has high refractive index, low dispersion, low density, high mechanical strength, heat-resistant stability and chemical-resistant stability; meanwhile, the method has simple process, is convenient for industrial production, is green and environment-friendly, and does not produce harmful waste gas.
In order to achieve the above object, a first aspect of the present invention provides a glass composition comprising, in terms of oxides based on the total weight of the glass composition:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
Preferably, the glass composition contains, in terms of oxides, based on the total weight of the glass composition:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5。
Preferably, (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6.
Preferably, the glass composition further comprises a fining agent.
Preferably, the fining agent is present in an amount of 0.1 to 0.5 wt%, preferably 0.2 to 0.4 wt%, calculated as oxides, based on the total weight of the glass composition.
Preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride, and a metal sulfide, preferably a metal chloride.
In a second aspect, the present invention provides a lanthanide glass including, in terms of oxides, based on the total weight of the lanthanide glass:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
Preferably, the lanthanide glass contains, in terms of oxides, based on the total weight of the lanthanide glass:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5。
Preferably, (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6.
Preferably, the lanthanide glass also contains a fining agent.
Preferably, the fining agent is present in an amount of 0.1 to 0.5 wt%, preferably 0.2 to 0.4 wt%, calculated as oxide, based on the total weight of the lanthanide glass.
Preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride, and a metal sulfide, preferably a metal chloride.
Preferably, the refractive index of the lanthanide glass is > 1.6, preferably 1.65-2; abbe number is more than or equal to 25, preferably 28-35; the Vickers hardness is more than or equal to 550MPa, preferably 550-600 MPa; the density is less than or equal to 4g/cm3Preferably 3.65 to 3.8g/cm3(ii) a The water resistance is 0.03 to 0.1%, preferably 0.03 to 0.06%.
Preferably, the lanthanide glass has a viscosity of 102.3The melting temperature corresponding to poise is less than or equal to 1250 ℃, and preferably 1200-1250 ℃.
Preferably, the lanthanide glass has a viscosity of 104The forming temperature corresponding to the poise time is less than or equal to 900 ℃, and preferably 800-900 ℃.
Preferably, the lanthanide glass has a viscosity of 104.5The shaping temperature corresponding to the poise time is less than or equal to 800 ℃, and preferably 700-800 ℃.
Preferably, the lanthanide glass has an upper crystallization temperature of 800 ℃ or less, preferably 700-800 ℃.
In a third aspect, the present invention provides a method for preparing a lanthanide glass, comprising the steps of:
melting, clarifying, stirring and homogenizing the glass composition, sequentially carrying out water-frying, secondary smelting and molding on the obtained glass liquid, and annealing and machining the obtained glass blank to obtain lanthanide glass; wherein the glass composition is the glass composition provided in the first aspect.
Preferably, the melting temperature is 1200-1350 ℃, and the stirring speed is 1-10 rpm.
Preferably, the water frying process comprises: and contacting the molten glass with water to obtain glass particles.
Preferably, the glass particles have an average diameter of ≦ 5mm, preferably 1-5 mm.
The invention provides the application of the lanthanide glass provided by the second aspect or the lanthanide glass prepared by the method provided by the third aspect in the optical waveguide of the virtual/mixed/augmented reality glasses device.
The invention provides a lanthanide glass wafer, which is obtained by processing the lanthanide glass provided by the second aspect or the lanthanide glass obtained by the method provided by the third aspect.
Through the technical scheme, the invention has the following advantages:
(1) the glass composition provided by the invention has the following physical properties by limiting the specific content of each component in the composition and the mutual synergistic action among the components: the refractive index is more than 1.6; the Abbe number is more than or equal to 25; the Vickers hardness is more than or equal to 550 MPa; the density is less than or equal to 4g/cm3(ii) a Viscosity of 102.3The melting temperature corresponding to poise is less than or equal to 1250 ℃; viscosity of 104The forming temperature corresponding to the poise time is less than or equal to 900 ℃; viscosity of 104.5The forming temperature corresponding to the poise time is less than or equal to 800 ℃; the upper limit temperature of crystallization is less than or equal to 800 ℃. The lanthanide series glass prepared by the technical scheme provided by the invention has the comprehensive properties of high refractive index, low dispersion, low density, high mechanical strength, heat-resistant stability and chemical resistance;
(2) the lanthanide series glass provided by the invention has low density, is convenient for the development trend of lightness and thinness of products, and is particularly used for manufacturing lanthanide series glass wafers;
(3) the method provided by the invention simplifies the process flow and is convenient for industrial production; meanwhile, the method does not generate waste gas and is green and environment-friendly.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a glass composition comprising, in terms of oxides based on the total weight of the glass composition:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
In some embodiments provided herein, preferably, the glass composition comprises, in terms of oxides based on the total weight of the glass composition:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5。
The preferred conditions are adopted, so that the high-refraction glass with low crystallization tendency, high uniformity and high thermal stability is more favorably melted.
In the glass composition provided by the present invention, La2O3The glass is positioned in the gaps of the glass network, so that the refractive index of the glass can be increased, the dispersion can be reduced, and the hot forming performance of the glass can be improved, but the glass is easy to crystallize when the content is too high. Thus, La is calculated as oxides based on the total weight of the glass composition2O3Is 30 to 40 wt%, for example, 30 wt%, 32 wt%, 35 wt%, 38 wt%, 40 wt%, and any value in the range of any two values, preferably 32 to 38 wt%.
In the glass composition provided by the invention, SiO2Is a glass-forming oxide of [ SiO ]4]The glass skeleton is formed by interconnection, which endows the glass with high mechanical strength and chemical resistance, is helpful for reducing the thermal expansion coefficient, but the liquidus temperature of the glass can be increased by too high content, and the melting clarification and the forming of the glass are not facilitated. Therefore, the temperature of the molten metal is controlled,SiO in terms of oxide based on the total weight of the glass composition2Is 2 to 4 wt%, e.g., 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, and any value in the range of any two numerical values, preferably 2.5 to 4 wt%.
In the glass composition provided by the present invention, B2O3Is a glass forming oxide, [ BO4]The thermal expansion coefficient of the glass is reduced, the chemical stability is increased, and the melting of the glass is promoted, but the volatilization amount is increased when the content is too high, so that the quality stability of the glass is difficult to control. Thus, B is calculated as the oxide based on the total weight of the glass composition2O3Is 3 to 8 wt%, for example, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, and any value in the range of any two numerical values, preferably 4 to 7 wt%.
In the glass composition provided by the present invention, P2O5Is a glass product oxide, improves the glass structure and adjusts the glass forming performance, but the content is too high, the glass is easy to crystallize, and the material property is shortened. Thus, P is calculated as the oxide based on the total weight of the glass composition2O5The amount of (b) is 0 to 2% by weight, for example, 0% by weight, 0.5% by weight, 0.6% by weight, 1% by weight, 1.2% by weight, 1.5% by weight, 2% by weight, and any value in the range of any two numerical values, preferably 0 to 1.5% by weight, more preferably 0 to 1.2% by weight.
In the glass composition provided by the present invention, Na2O is a glass component and a cosolvent, reduces the high-temperature viscosity of the glass, is beneficial to eliminating stripes, but has over-high content and serious fracture of a glass structure, and is unfavorable for the mechanical property, the thermal stability, the chemical stability and the like of the glass. Thus, Na is calculated as oxide based on the total weight of the glass composition2The content of O is 0 to 2% by weight, for example, 0% by weight, 0.5% by weight, 0.8% by weight, 1% by weight, 1.2% by weight, 1.5% by weight, 2% by weight, and any value in the range of any two numerical values, preferably 0 to 1.5% by weight.
In the glass composition provided by the present invention, K2O can be mixed with Na2O forms a mixed alkali effect in production, better promotes the melting of the glass, improves the surface gloss of the glass and reduces the crystallization performance, but the content is too high, and the mechanical property, the thermal stability, the chemical stability and other properties of the glass are not favorable. Thus, K is calculated as the oxide based on the total weight of the glass composition2The content of O is 0 to 1% by weight, for example, 0% by weight, 0.1% by weight, 0.2% by weight, 0.5% by weight, 0.6% by weight, 0.8% by weight, 1% by weight, and any value in the range of any two values, preferably 0 to 0.8% by weight.
In the glass composition provided by the invention, SrO improves the glass structure and adjusts the glass forming performance, but the content is too high, the glass is easy to crystallize, and the material property is shortened. Thus, the SrO content is 1 to 3 weight percent, e.g., 1 weight percent, 1.5 weight percent, 2 weight percent, 2.5 weight percent, 3 weight percent, and any value in the range of any two values, preferably 1.5 to 3 weight percent, calculated as oxides, based on the total weight of the glass composition.
In the glass composition provided by the invention, BaO is used as a network outer body of high-refraction glass, the refractive index, the density and the glossiness of the glass can be improved, but the content is too high, the chemical stability, the thermal stability and the crystallization performance of the glass are obviously reduced, and meanwhile, the corrosion to refractory materials and platinum crucibles is aggravated. Accordingly, the BaO content is 2 to 6% by weight, e.g., 2%, 2.5%, 3%, 4%, 5%, 6%, and any of two values in the range, preferably 2.5 to 6% by weight, in terms of oxide, based on the total weight of the glass composition.
In the glass composition provided by the invention, ZnO can reduce the high-temperature viscosity and the linear expansion coefficient of high-refraction glass, improve the luster of the glass, improve the chemical stability of the glass, and can replace part of BaO to reduce the corrosion to refractory materials and platinum crucibles. Thus, the ZnO is present in an amount of 2 to 5 wt%, e.g., 2 wt%, 2.5 wt%, 3 wt%, 4 wt%, 5 wt%, and any of two numerical ranges, preferably 2.5 to 5 wt%, calculated as oxide, based on the total weight of the glass composition.
In the glass composition provided by the invention, TiO2The introduction of (2) increases the content of network oxide of the glass, thereby increasing the chemical stability of the glass, improving the refractive index and dispersion of the optical glass, and reducing the density and high-temperature viscosity of the glass, but the glass is colored when the content is too high. Thus, TiO is present in an amount of oxide based on the total weight of the glass composition2The content of (b) is 8 to 15% by weight, for example, 8% by weight, 9% by weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 14.5% by weight, 15% by weight, and any value in the range of any two values, preferably 9 to 14.5% by weight.
In the glass composition provided by the invention, ZrO2The introduction of the compound can improve the chemical stability, the crystallization property and the refractive index of the glass, and is an important component of the optical glass, but the glass melting difficulty is increased and ZrO appears due to too high content2Precipitation defects. Thus, ZrO is present in an oxide amount based on the total weight of the glass composition2Is 2 to 5 wt%, for example, 2 wt%, 3 wt%, 4 wt%, 4.5 wt%, 5 wt%, and any value in the range of any two numerical values, preferably 2 to 4.5 wt%.
In the glass composition provided by the invention, Nb2O5The glass is an important component of optical glass, the refractive index of the glass is increased, the crystallization performance of the glass is improved, but the Abbe number is reduced and secondary bubbles are generated when the content is too high. Thus, Nb is present in an amount of oxide based on the total weight of the glass composition2O5Is 25 to 35 wt%, for example, 25 wt%, 26.5 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34.5 wt%, 35 wt%, and any value in the range of any two values, preferably 26.5 to 34.5 wt%.
In the glass composition provided by the invention，La2O3And Nb2O5As a main component which affects the refractive index of the glass, the refractive index of the lanthanoid glass is increased. Thus, (La)2O3+Nb2O5) And ≧ 62 wt%, preferably 62-67 wt%, for example, 62 wt%, 63 wt%, 64 wt%, 65 wt%, 66 wt%, 67 wt%, and any value in the range of any two numerical values.
In the glass composition provided by the present invention, B2O3Assisting in melting of glass, but [ BO4]Structural ratio [ SiO4]The connection is loose, the action of water and the surface of the glass is strong, B2O3High glass content has poor water stability, and B2O3High levels result in a narrow glass forming temperature range. Thus, B2O3/(SiO2+B2O3) Is ≧ 0.5, preferably 0.5 to 0.85, e.g., 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and any value in the range of any two numerical values.
In the glass composition provided by the invention, a plurality of alkaline earth metal oxides diversify the glass composition, reduce the glass phase separation and crystallization tendency, ZnO is generally an intermediate oxide, and when the oxygen in the glass is enough, ZnO can be formed4]The glass enters a network structure of the glass, so that the structure of the glass is more stable, the stability and the refractive index of the glass can be improved, and the glass is easy to crystallize if the amount of the glass is too much. Therefore, the weight ratio ZnO/(ZnO + SrO + BaO) is 0.25 or more, preferably 0.25 to 0.6, for example, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, and any value in the range of any two numerical compositions.
In the glass composition provided by the invention, the glass composition can also contain a clarifying agent during glass melting according to different glass preparation processes.
In some embodiments of the present invention, the fining agent is preferably present in an amount ranging from 0.1 to 0.5 wt%, e.g., 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, and any of two numerical compositions in any range, preferably from 0.2 to 0.4 wt%, calculated as oxides, based on the total weight of the glass composition.
In the present invention, there is a wide range of choices for the type of fining agent. Preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride and a metal sulfide, preferably a metal chloride, e.g., NaCl, NH4Cl、BaCl2Etc., but the present invention is not limited thereto.
It will be appreciated by those skilled in the art that the present invention provides glass compositions wherein the glass composition contains 30 to 40 wt.% La2O32-4% by weight of SiO23-8% by weight of B2O30-2% by weight of P2O50-2% by weight of Na2O, 0-1% by weight of K2O, 1-3 wt% SrO, 2-6 wt% BaO, 2-5 wt% ZnO, 8-15 wt% TiO22-5% by weight of ZrO225-35% by weight of Nb2O5The glass composition contains La-containing compounds, Si-containing compounds, B-containing compounds, P-containing compounds, Na-containing compounds, K-containing compounds, Sr-containing compounds, Ba-containing compounds, Zn-containing compounds, Ti-containing compounds, Zr-containing compounds and Nb-containing compounds, such as carbonates, nitrates, sulfates, phosphates, basic carbonates, oxides and the like of the elements, and the content of the components is calculated by the oxides of the elements, and the selection of the carbonates, nitrates, sulfates, phosphates, basic carbonates and oxides of the elements is well known to those skilled in the art and is not described herein.
The glass composition provided by the invention can be used for preparing lanthanide glass, so that the glass has excellent comprehensive performance mainly due to the mutual matching of the components in the composition, especially La2O3、SiO2、B2O3、P2O5、Na2O、K2O、SrO、BaO、ZnO、TiO2、ZrO2、Nb2O5Inter alia, especiallyThe components with the specific contents are matched with each other, so that the refractive index, dispersion, thermal stability, chemical stability and mechanical stability of the lanthanide series glass can be effectively improved.
According to a particularly preferred embodiment of the present invention, the glass composition comprises, in terms of oxides, based on the total weight of the glass composition:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5；
Wherein (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6.
In a second aspect, the present invention provides a lanthanide glass including, in terms of oxides, based on the total weight of the lanthanide glass:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
In some embodiments of the present invention, preferably, the lanthanide glass contains, in terms of oxides, based on the total weight of the lanthanide glass:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5。
In some embodiments of the invention, preferably, (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6. Using preferred stripsThe glass is more beneficial to melting high-refraction glass with low crystallization tendency, high uniformity and high thermal stability.
In some embodiments of the present invention, preferably, the lanthanide glass also contains a fining agent. It is further preferred that the fining agent is present in an amount ranging from 0.1 to 0.5 wt%, e.g., 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, and any value in the range of any two values, preferably 0.2 to 0.4 wt%, calculated as oxides, based on the total weight of the lanthanide glass.
In the present invention, there is a wide range of choices for the type of fining agent. Preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride and a metal sulfide, preferably a metal chloride, e.g., NaCl, NH4Cl、BaCl2Etc., but the present invention is not limited thereto.
According to the invention, preferably, the refractive index of the lanthanide glass is > 1.6, preferably 1.65-2; abbe number is more than or equal to 25, preferably 28-35; the Vickers hardness is more than or equal to 550MPa, preferably 550-600 MPa; the density is less than or equal to 4g/cm3Preferably 3.65 to 3.8g/cm3(ii) a The water resistance is 0.03 to 0.1%, preferably 0.03 to 0.06%.
In the invention, under the condition of no special condition, the refractive index parameter and the Abbe number parameter are both measured by the refractive index and the dispersion coefficient of the No. 1 part of GB/T7962.1-2010 colorless optical glass test method; the Vickers hardness parameter is measured by GB/T4340.1-2009 Vickers hardness test part 1-test method of metal material; the density parameter is measured by the density of the No. 20 GB/T7962.20-2010 colorless optical glass test method; the water resistance parameter is measured by the chemical stability test method powder method of GB T17129-1997 colorless optical glass.
According to the invention, preferably, said lanthanide glasses have a viscosity of 102.3The melting temperature corresponding to poise is less than or equal to 1250 ℃, and preferably 1200-1250 ℃. The glass has low viscosity and is easy to melt, and the glass is easy to clarify under low viscosity. The temperature is determined by reference to ASTM C-965 method using a rotary high temperature viscometer at 102.3Viscosity of poiseThe corresponding temperature.
According to the invention, preferably, said lanthanide glasses have a viscosity of 104The forming temperature corresponding to the poise time is less than or equal to 900 ℃, and preferably 800-900 ℃. The temperature is determined by reference to ASTM C-965 method using a rotary high temperature viscometer at 104Poise viscosity, temperature.
According to the invention, preferably, said lanthanide glasses have a viscosity of 104.5The shaping temperature corresponding to the poise time is less than or equal to 800 ℃, and preferably 700-800 ℃. The temperature is determined by reference to ASTM C-965 method using a rotary high temperature viscometer at 104.5Poise viscosity, temperature.
According to the invention, the upper crystallization temperature of the lanthanide glass is preferably less than or equal to 800 ℃, preferably 700-800 ℃. The temperature is measured by a temperature gradient furnace method, which is well known to those skilled in the art and will not be described herein in detail, with reference to the ASTM C-829 method.
In a third aspect, the present invention provides a method for preparing a lanthanide glass, comprising the steps of:
melting, clarifying, stirring and homogenizing the glass composition, sequentially carrying out water-frying, secondary smelting and molding on the obtained glass liquid, and annealing and machining the obtained glass blank to obtain lanthanide glass; wherein the glass composition is the glass composition provided in the first aspect.
In some embodiments of the invention, the melt fining may be in a vessel conventional in the art, and preferably, the melt fining is in a crucible. In the present invention, the detailed description of the kind of the crucible is omitted.
In some embodiments of the present invention, it is preferable that the melting temperature is 1200-1350 deg.C and the stirring speed is 1-10 rpm. The specific melting temperature and melting time, and the stirring speed and stirring time can be determined by those skilled in the art according to practical situations, which are well known to those skilled in the art and will not be described in detail herein.
In some embodiments of the present invention, preferably, the water frying process comprises: and contacting the molten glass with water to obtain glass particles. Further preferably, the glass particles have an average diameter ≦ 5mm, preferably 1-5mm, for example, 1mm, 2mm, 3mm, 4mm, 5mm, and any value in the range of any two numerical compositions.
In the present invention, the specific annealing temperature and annealing time can be determined by those skilled in the art according to the actual situation, which is well known to those skilled in the art and will not be described herein.
In some embodiments of the present invention, the annealing treatment may be performed in a vessel conventional in the art, and preferably, the annealing treatment is performed in an annealing furnace.
In the method of the present invention, the machining method is not particularly limited, and various machining methods commonly used in the art may be used, and for example, the product obtained by the annealing treatment may be cut, ground, polished, or the like.
The invention provides a lanthanide glass provided by the second aspect, or a lanthanide glass prepared by the method provided by the third aspect, in application to an optical waveguide of a virtual/augmented/mixed reality glasses device.
The invention provides a lanthanide glass wafer, which is obtained by processing the lanthanide glass provided by the second aspect, or the lanthanide glass obtained by the method provided by the third aspect.
In the invention, the processing mode has a wide selection range, and the lanthanide glass provided by the invention can be processed to obtain the lanthanide glass wafer meeting the requirement.
In some embodiments of the present invention, preferably, the processing comprises: the lanthanide series glass is obtained by cutting, grinding and polishing in sequence.
The present invention will be described in detail below by way of examples. In the following examples, each material used was commercially available unless otherwise specified, and the method used was a conventional method in the art unless otherwise specified.
The refractive index parameter and the Abbe number parameter are both measured by the refractive index and the dispersion coefficient of the No. 1 part of GB/T7962.1-2010 colorless optical glass test method;
the Vickers hardness parameter is measured by GB/T4340.1-2009 Vickers hardness test part 1-test method of metal material;
the density parameter is measured by the density of the No. 20 GB/T7962.20-2010 colorless optical glass test method;
the water resistance parameter is measured by a powder method of a chemical stability test method for the GB T17129-1997 colorless optical glass;
high temperature viscosity parameters the high temperature viscosity temperature curve of a glass tube was determined at 10 by using a rotary high temperature viscometer with reference to ASTM C-965 method2.3The corresponding melting temperature in poise viscosity in units of; at 104Poise viscosity and 104.5The corresponding molding temperature in poise viscosity is;
the crystallization upper limit temperature parameter is determined by a gradient temperature furnace method according to the ASTM C-829 method, and the unit is;
example 1
(1) Weighing 20kg of the glass composition according to the glass composition shown in Table 1, and spraying 30g of water in the mixing process until the components are uniformly mixed to obtain a mixture;
(2) adding the mixture into a platinum-rhodium crucible for 5 times at 800 ℃, after the feeding is finished within 6 hours, heating to 1250 ℃ for 3 hours to melt, stirring for 3 hours, upwards stirring for 3 hours at the speed of 5rpm by using a single-layer two-blade paddle stirrer, then discharging, downwards stirring for 0.5 hour, removing the stirrer, pouring glass liquid into cold 150L of purified water after 1 hour, and carrying out deep-frying treatment, wherein the diameter of glass particles is controlled to be less than 5 mm;
(3) adding glass particles into a platinum-rhodium crucible, putting the crucible into a hearth at 1250 ℃, preserving heat for 1h, stirring upwards for 3h at the speed of 5rpm by using a single-layer two-blade paddle stirrer, then discharging and stirring downwards for 0.5h, moving out the stirrer, taking out the crucible after 1h, hooking a layer of molten glass on the surface of the crucible, placing for 30s, pouring the molten glass in the crucible onto a grinding tool, moving the crucible backwards at a constant speed in the process of pouring the molten glass until a glass blank is formed, wherein the thickness of the glass blank is 60mm, the width is 380mm, and the length is 550 mm;
(4) putting the glass blank into a precision annealing furnace, preserving heat for 400min at the glass annealing point temperature, then reducing the temperature to 50 ℃ at the cooling rate of 3 ℃/h, closing the high-temperature furnace, reducing the temperature of the glass blank to room temperature along with the furnace, and then forming a lanthanide glass sheet S1 with the thickness of 0.5mm by adopting a multi-wire cutting machine;
(5) and (3) grinding the two sides of the lanthanide series glass S1, performing coarse grinding and fine grinding at the rotating speed of 5rpm to 0.4mm, performing surface polishing treatment until the roughness is less than 1nm, cleaning and drying to obtain the lanthanide series glass wafer Q1.
The lanthanide glass S1 was subjected to the performance test, and the results are shown in table 2.
Examples 2 to 8
Following the procedure of example 1, except that lanthanide glasses S2-S8 and lanthanide glass wafers Q2-Q8 were prepared according to the materials and compositions of table 1, respectively.
The lanthanide glass S2-S8 was subjected to performance tests, and the results are shown in Table 2.
TABLE 1
| The glass composition satisfies | Example 1 | Example 2 | Example 3 | Example 4 |
| La2O3，wt％ | 38 | 39.5 | 35 | 30.5 |
| SiO2，wt％ | 4 | 3 | 2 | 2.5 |
| B2O3，wt％ | 6 | 5 | 7 | 3 |
| P2O5，wt％ | 0 | 1 | 0.5 | 2 |
| Na2O，wt％ | 0 | 1.5 | 0.5 | 2 |
| K2O，wt％ | 1 | 0.5 | 0.6 | 1 |
| SrO，wt％ | 3 | 2.5 | 2 | 1.5 |
| BaO，wt％ | 2.5 | 3 | 4 | 5 |
| ZnO，wt％ | 4 | 5 | 4 | 3 |
| TiO2，wt％ | 12 | 9 | 8.5 | 10.5 |
| ZrO2，wt％ | 3.5 | 3 | 4 | 4 |
| Nb2O5，wt％ | 25.5 | 26.5 | 31.5 | 34.5 |
| (La2O3+Nb2O5)，wt％ | 63.5 | 66 | 66.5 | 65 |
| B2O3/(SiO2+B2O3) | 0.6 | 0.63 | 0.78 | 0.55 |
| ZnO/(ZnO+SrO+BaO) | 0.42 | 0.48 | 0.4 | 0.32 |
TABLE 1
TABLE 2
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Refractive index | 1.72 | 1.92 | 1.98 | 1.85 |
| Abbe number | 29 | 35 | 34 | 32 |
| Vickers hardness, MPa | 565 | 572 | 581 | 568 |
| Density, g/cm3 | 3.68 | 3.7 | 3.71 | 3.69 |
| Viscosity 102.3Melting temperature in poise, DEG C | 1238 | 1240 | 1233 | 1243 |
| Viscosity 104The forming temperature at poise time, DEG C | 872 | 873 | 865 | 880 |
| Viscosity 104.5The forming temperature at poise time, DEG C | 773 | 775 | 776 | 782 |
| Upper limit temperature of crystallization,. degree.C | 792 | 794 | 787 | 790 |
| Water resistance, is | 0.04 | 0.06 | 0.05 | 0.06 |
TABLE 2
| Example 5 | Example 6 | Example 7 | Example 8 | |
| Refractive index | 1.8 | 1.75 | 1.62 | 1.65 |
| Abbe number | 32 | 30 | 28 | 29 |
| Vickers hardness, MPa | 577 | 582 | 566 | 570 |
| Density, g/cm3 | 3.72 | 3.74 | 3.76 | 3.72 |
| Viscosity 102.3Melting temperature in poise, DEG C | 1245 | 1240 | 1235 | 1239 |
| Viscosity 104The forming temperature at poise time, DEG C | 875 | 877 | 870 | 868 |
| Viscosity 104.5The forming temperature at poise time, DEG C | 779 | 778 | 775 | 772 |
| Upper limit temperature of crystallization,. degree.C | 777 | 785 | 782 | 785 |
| Water resistance, is | 0.04 | 0.05 | 0.04 | 0.06 |
From the results of tables 1-2, it can be seen that the properties of the lanthanide glasses produced in examples 1-8 of the present invention satisfy: the refractive index is more than 1.6; the Abbe number is more than or equal to 25; the Vickers hardness is more than or equal to 550 MPa; the density is less than or equal to 4g/cm3(ii) a The water resistance is 0.03-0.1%; viscosity of 102.3The melting temperature corresponding to poise is less than or equal to 1250 ℃; viscosity of 104The forming temperature corresponding to the poise time is less than or equal to 900 ℃; viscosity of 104.5The forming temperature corresponding to the poise time is less than or equal to 800 ℃; the upper limit temperature of crystallization is less than or equal to 800 ℃.
Therefore, the invention can further improve the comprehensive performance of the lanthanide glass by regulating the content of each component in the glass composition, especially by limiting the content of each component in the preferable protection range, namely, the lanthanide glass has high refractive index, low dispersion, low density, high mechanical strength, heat stability and chemical stability at the same time.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A glass composition characterized in that it comprises, in terms of oxides, based on the total weight of the glass composition:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
2. The glass composition according to claim 1, wherein the glass composition comprises, in terms of oxides based on the total weight of the glass composition:
32-38 wt.% La2O3；
2.5-4% by weight ofSiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5；
Preferably, (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6.
3. The glass composition of claim 1 or 2, further comprising a fining agent;
preferably, the fining agent is present in an amount of 0.1 to 0.5 wt%, preferably 0.2 to 0.4 wt%, calculated as oxides, based on the total weight of the glass composition;
preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride, and a metal sulfide, preferably a metal chloride.
4. A lanthanide glass, characterized in that the lanthanide glass comprises, in terms of oxides, based on the total weight of the lanthanide glass:
30-40 wt.% La2O3；
2-4% by weight of SiO2；
3-8% by weight of B2O3；
0-2% by weight of P2O5；
0-2 wt.% of Na2O；
0-1% by weight of K2O；
1-3 wt% SrO;
2-6 wt% BaO;
2-5% by weight of ZnO;
8-15% by weight of TiO2；
2-5% by weight of ZrO2；
25-35 wt.% of Nb2O5；
Wherein (La)2O3+Nb2O5) Not less than 62 wt%, B2O3/(SiO2+B2O3) The weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.5, and the weight ratio of ZnO/(ZnO + SrO + BaO) is more than or equal to 0.25.
5. The lanthanide glass according to claim 4, wherein the lanthanide glass comprises, in terms of oxides, based on the total weight of the lanthanide glass:
32-38 wt.% La2O3；
2.5-4% by weight of SiO2；
4-7% by weight of B2O3；
0-1.5% by weight of P2O5；
0-1.5 wt.% of Na2O；
0-0.8% by weight of K2O；
1.5-3 wt% SrO;
2.5-6 wt% BaO;
2.5-5 wt% ZnO;
9-14.5% by weight of TiO2；
2-4.5% by weight of ZrO2；
26.5-34.5 wt.% Nb2O5；
Preferably, (La)2O3+Nb2O5) The sum of (a) and (B) is 62-67 wt%2O3/(SiO2+B2O3) In a weight ratio of 0.5-0.85, and the weight ratio of ZnO/(ZnO + SrO + BaO) is 0.25-0.6;
preferably, the lanthanide glass also contains a fining agent;
preferably, the fining agent is present in an amount of 0.1 to 0.5 wt%, preferably 0.2 to 0.4 wt%, calculated as oxide, based on the total weight of the lanthanide glass;
preferably, the fining agent is selected from at least one of a metal chloride, a metal fluoride, and a metal sulfide, preferably a metal chloride.
6. The lanthanide glass according to claim 4 or 5, wherein said lanthanide glass has a refractive index > 1.6, preferably 1.65-2; abbe number is more than or equal to 25, preferably 28-35; the Vickers hardness is more than or equal to 550MPa, preferably 550-600 MPa; the density is less than or equal to 4g/cm3Preferably 3.65 to 3.8g/cm3(ii) a Water resistance of 0.03-0.1%, preferably 0.03-0.06%;
preferably, the lanthanide glass has a viscosity of 102.3The melting temperature corresponding to poise is less than or equal to 1250 ℃, and preferably 1200-1250 ℃;
preferably, the lanthanide glass has a viscosity of 104The forming temperature corresponding to the poise time is less than or equal to 900 ℃, and preferably 800-900 ℃;
preferably, the lanthanide glass has a viscosity of 104.5The forming temperature corresponding to the poise time is less than or equal to 800 ℃, and preferably is 700-800 ℃;
preferably, the lanthanide glass has an upper crystallization temperature of 800 ℃ or less, preferably 700-800 ℃.
7. A method for preparing lanthanide glass, comprising the steps of:
melting, clarifying, stirring and homogenizing the glass composition, sequentially carrying out water-frying, secondary smelting and molding on the obtained glass liquid, and annealing and machining the obtained glass blank to obtain lanthanide glass;
wherein the glass composition is the glass composition according to any one of claims 1 to 3.
8. The method according to claim 7, wherein the melting temperature is 1200 ℃ and the stirring speed is 1-10 rpm;
preferably, the water frying process comprises: contacting the molten glass with water to obtain glass particles;
preferably, the glass particles have an average diameter of ≦ 5mm, preferably 1-5 mm.
9. Use of a lanthanide glass as defined in any one of claims 4 to 6, or a lanthanide glass produced by the method of claims 7 or 8, in an optical waveguide of a virtual/augmented/mixed reality eyewear device.
10. Lanthanide glass wafer, characterized in that it is obtained by treatment of a lanthanide glass according to any one of claims 4-6, or a lanthanide glass obtained by the preparation method according to claim 7 or 8.
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