Optical glass, chemically strengthened glass and glass element

Abstract

The invention provides optical glass with relatively high hardness. The optical glass comprises the following components in percentage by weight: 52-64% of SiO2; 9 to 20 percent of Al2O3; 13 to 24% of Na2O; k2O: greater than 0 but less than or equal to 8%; 0.5 to 9 percent of Li2O; mgO: more than 0 but less than or equal to 7%, wherein SiO2 / Na2O is 2.5-4.5. Through reasonable component design, the optical glass obtained by the invention has expected refractive index and Abbe number, and also has relatively high hardness.

Description

Technical Field

[0001] The present invention relates to optical glass, in particular to optical glass with high hardness and a glass component made of the same. Background Art

[0002] Optical glass is a glass material used in the manufacture of lenses, prisms, mirrors, and windows in optical instruments. Among optical glasses used in glass components, there is a particularly high demand for glass with a medium refractive index and low dispersion, which can achieve overall lightweighting and miniaturization of optical systems. Optical glass with a refractive index of 1.49 to 1.55 and an Abbe number of 54 to 61 is widely used in the manufacture of optical instruments such as cameras, telescopes, and microscopes due to its medium refractive index and low dispersion.

[0003] With technological advancements and the continuous improvement of optical instruments, optical glass with the aforementioned refractive index and Abbe number has found widespread application in areas such as in-vehicle imaging and security monitoring. Optical glass used in these applications requires high hardness to withstand abrasion and impact from sand and rocks during vehicle operation, thereby extending the service life of the optical glass. Chinese patent CN110204194A discloses an optical glass with a refractive index of 1.50-1.60 and an Abbe number of 50-60, but its hardness needs to be further improved. Summary of the Invention

[0004] Based on the above reasons, the technical problem to be solved by the present invention is to provide an optical glass with higher hardness.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] (1) Optical glass, the components of which, expressed in percentage by weight, contain: SiO2: 52-64%; Al2O3: 9-20%; Na2O: 13-24%; K2O: greater than 0 but less than or equal to 8%; Li2O: 0.5-9%; MgO: greater than 0 but less than or equal to 7%, wherein the SiO2 / Na2O ratio is 2.5-4.5.

[0007] (2) The optical glass according to (1), wherein the components are expressed in weight percentage and further contain: CaO: 0-7%; and / or B2O3: 0-4.5%; and / or La2O3: 0-4%; and / or Y2O3: 0-3%; and / or Gd2O3: 0-3%; and / or ZrO2: 0-5%; and / or ZnO: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-3%; and / or TiO2: 0-3%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or a clarifier: 0-1%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0008] (3) Optical glass, comprising SiO2, Al2O3, Na2O, K2O, Li2O and MgO, wherein the composition is expressed in weight percentage, wherein SiO2 / Na2O is 2.5 to 4.5, and the refractive index of the optical glass is n d is 1.49~1.55, Abbe number ν d 54~61, Knoop hardness H K 540×10 7 Pa or above.

[0009] (4) The optical glass according to (3), wherein the components thereof are expressed in weight percentages as follows: SiO2: 52-64%; and / or Al2O3: 9-20%; and / or Na2O: 13-24%; and / or K2O: greater than 0 but less than or equal to 8%; and / or Li2O: 0.5-9%; and / or MgO: greater than 0 but less than or equal to 7%; and / or CaO: 0-7%; and / or B2O3: 0-4.5%; and / or La2O3: 0-4%; and and / or Y2O3: 0-3%; and / or Gd2O3: 0-3%; and / or ZrO2: 0-5%; and / or ZnO: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-3%; and / or TiO2: 0-3%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or a clarifier: 0-1%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0010] (5) The optical glass according to any one of (1) to (4), wherein the components thereof, expressed in weight percentage, satisfy one or more of the following five conditions:

[0011] 1) SiO2 / Na2O is 2.8 to 4.2, preferably SiO2 / Na2O is 3.0 to 3.8;

[0012] 2) SiO2 / Al2O3 is 2.8 to 6.5, preferably SiO2 / Al2O3 is 3.0 to 6.0, more preferably SiO2 / Al2O3 is 3.5 to 5.5, and further preferably SiO2 / Al2O3 is 3.7 to 5.0;

[0013] 3) (Al2O3+Na2O) / (SiO2+B2O3) is 0.35-0.8, preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.4-0.75, more preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.42-0.7, and further preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.45-0.65;

[0014] 4) Al2O3 / (MgO+CaO) is 2.0 to 15.0, preferably Al2O3 / (MgO+CaO) is 2.5 to 12.0, more preferably Al2O3 / (MgO+CaO) is 3.0 to 10.0, and further preferably Al2O3 / (MgO+CaO) is 4.5 to 9.3;

[0015] 5) Al2O3 / Li2O is 2.0 to 20.0, preferably Al2O3 / Li2O is 3.0 to 15.0, more preferably Al2O3 / Li2O is 3.5 to 10.0, and further preferably Al2O3 / Li2O is 3.5 to 7.0.

[0016] (6) The optical glass according to any one of (1) to (4), wherein the components thereof, expressed in weight percentage, satisfy one or more of the following six conditions:

[0017] 1) (K2O+B2O3+TiO2) / Al2O3 is 0.05-1.0, preferably (K2O+B2O3+TiO2) / Al2O3 is 0.05-0.8, more preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.7, and further preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.5;

[0018] 2) (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 1.0 or less, preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.7 or less, more preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.5 or less, and further preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.3 or less;

[0019] 3) (ZnO + TiO2) / (MgO + CaO) is 1.0 or less, preferably (ZnO + TiO2) / (MgO + CaO) is 0.8 or less, more preferably (ZnO + TiO2) / (MgO + CaO) is 0.5 or less, and further preferably (ZnO + TiO2) / (MgO + CaO) is 0.2 or less;

[0020] 4) (K2O+B2O3+ZnO) / Na2O is 0.02 to 1.0, preferably (K2O+B2O3+ZnO) / Na2O is 0.05 to 0.8, more preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.7, and further preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.4;

[0021] 5) (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 1.0, preferably (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 0.8, more preferably (MgO + CaO + SrO + BaO) / Na2O is 0.03 to 0.5, and further preferably (MgO + CaO + SrO + BaO) / Na2O is 0.05 to 0.3;

[0022] 6) (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.6, preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.5, more preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.3, and further preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is 0.01~0.15.

[0023] (7) The optical glass according to any one of (1) to (4), wherein the components are expressed in weight percentage, wherein: SiO2: 55-62%, preferably SiO2: 57-61%; and / or Al2O3: 10.5-18%, preferably Al2O3: 11-16%; and / or Na2O: 15-22%, preferably Na2O: 16-20%; and / or K2O: 0.5-6%, preferably K2O: 1-4 .5%; and / or CaO: 0-5%, preferably CaO: 0.1-3%; and / or MgO: 0.5-5%, preferably MgO: 1-3.5%; and / or Li2O: 1-7%, preferably Li2O: 2-6%; and / or B2O3: 0-3%, preferably B2O3: 0-1%; and / or La2O3: 0-2%, preferably La2O3: 0.1-1.5%; and / or Y2O3: 0-1% , preferably Y2O3: 0-0.5%; and / or Gd2O3: 0-1%, preferably Gd2O3: 0-0.5%; and / or ZrO2: 0-3%, preferably ZrO2: 0-2%; and / or ZnO: 0-3%, preferably ZnO: 0-2%; and / or BaO: 0-3%, preferably BaO: 0-2%; and / or SrO: 0-1%, preferably SrO: 0-0.5%; and / or TiO2: 0 ~2%, preferably TiO2: 0~1%; and / or Nb2O5: 0~2%, preferably Nb2O5: 0~1%; and / or WO3: 0~2%, preferably WO3: 0~1%; and / or Ta2O5: 0~2%, preferably Ta2O5: 0~1%; and / or clarifier: 0~0.8%, preferably clarifier: 0~0.5%, the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0024] (8) The optical glass according to any one of (1) to (4), which does not contain SrO; and / or does not contain Gd2O3; and / or does not contain Nb2O5; and / or does not contain TiO2; and / or does not contain WO3; and / or does not contain Ta2O5; and / or does not contain P2O5; and / or does not contain Sc2O3; and / or does not contain F.

[0025] (9) The optical glass according to any one of (1) to (4), wherein the refractive index n of the optical glass is d 1.49 to 1.55, preferably 1.50 to 1.54, more preferably 1.51 to 1.53; Abbe number ν d It is 54-61, preferably 55-60, and more preferably 56-59.

[0026] (10) The optical glass according to any one of (1) to (4), wherein the thermal expansion coefficient of the optical glass is α 20 / 120℃ 115×10 -7 / K or less, preferably 110×10 -7 / K or less, more preferably 90×10 -7 / K~102×10 -7 / K; and / or water resistance stability D W 3 or more, preferably 2 or more; and / or acid resistance stability D A 2 or more, preferably 1; and / or Knoop hardness H K 540×10 7 Pa or more, preferably 550×10 7 Pa or more, more preferably 560×10 7 Pa~590×10 7 Pa; and / or transition temperature T g The temperature is 490°C or lower, preferably 480°C or lower, more preferably 470°C or lower; and / or the bubble degree is A0 or higher, preferably A 00 and / or anti-crystallization performance is 2 or more, preferably 1 type; and / or density ρ is 2.70g / cm 3 Below, preferably 2.60g / cm 3 Below, more preferably 2.50g / cm 3 the following.

[0027] (11) A glass preform made of any one of the optical glasses described in (1) to (10).

[0028] (12) Chemically strengthened glass, made from the optical glass described in any one of (1) to (10), or made from the glass preform described in (11).

[0029] (13) The chemically strengthened glass according to (12), wherein the surface stress of the chemically strengthened glass is 500 MPa or more, preferably 600 MPa or more, more preferably 650 MPa or more; and / or the depth of the strengthening layer is 20 μm or more, preferably 30 μm or more, more preferably 40 to 65 μm; and / or the fracture strength in a ring-to-ring test is 1800 MPa or more, preferably 2000 MPa or more, more preferably 2100 MPa or more; and / or the surface quality is Class 2 or more, preferably Class 1; and / or the fracture strength improvement ratio in a ring-to-ring test is 1.5 or more, preferably 1.8 or more, more preferably 2.0 or more.

[0030] (14) A glass element made of the optical glass described in any one of (1) to (10), or made of the glass preform described in (11), or made of the chemically strengthened glass described in any one of (12) to (13).

[0031] (15) An optical instrument comprising the optical glass described in any one of (1) to (10), or the chemically strengthened glass described in any one of (12) to (13), or the glass element described in (14).

[0032] The present invention also provides a chemically strengthened glass:

[0033] (16) Chemically strengthened glass, the composition of which, expressed in weight percentage, comprises: SiO2: 52-64%; Al2O3: 9-20%; Na2O: 13-24%; K2O: greater than 0 but less than or equal to 8%; Li2O: 0.5-9%; MgO: greater than 0 but less than or equal to 7%.

[0034] (17) The chemically strengthened glass according to (16), wherein the components are expressed in weight percentage and further contain: CaO: 0-7%; and / or B2O3: 0-4.5%; and / or La2O3: 0-4%; and / or Y2O3: 0-3%; and / or Gd2O3: 0-3%; and / or ZrO2: 0-5%; and / or ZnO: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-3%; and / or TiO2: 0-3%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or a clarifier: 0-1%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0035] (18) The chemically strengthened glass according to (16) or (17), wherein the composition, expressed in weight percentage, satisfies one or more of the following five conditions:

[0036] 1) SiO2 / Na2O is 2.5 to 4.5, preferably SiO2 / Na2O is 2.8 to 4.2, and more preferably SiO2 / Na2O is 3.0 to 3.8;

[0037] 2) SiO2 / Al2O3 is 2.8 to 6.5, preferably SiO2 / Al2O3 is 3.0 to 6.0, more preferably SiO2 / Al2O3 is 3.5 to 5.5, and further preferably SiO2 / Al2O3 is 3.7 to 5.0;

[0038] 3) (Al2O3+Na2O) / (SiO2+B2O3) is 0.35-0.8, preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.4-0.75, more preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.42-0.7, and further preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.45-0.65;

[0039] 4) Al2O3 / (MgO+CaO) is 2.0 to 15.0, preferably Al2O3 / (MgO+CaO) is 2.5 to 12.0, more preferably Al2O3 / (MgO+CaO) is 3.0 to 10.0, and further preferably Al2O3 / (MgO+CaO) is 4.5 to 9.3;

[0040] 5) Al2O3 / Li2O is 2.0 to 20.0, preferably Al2O3 / Li2O is 3.0 to 15.0, more preferably Al2O3 / Li2O is 3.5 to 10.0, and further preferably Al2O3 / Li2O is 3.5 to 7.0.

[0041] (19) The chemically strengthened glass according to (16) or (17), wherein the composition, expressed in weight percentage, satisfies one or more of the following six conditions:

[0042] 1) (K2O+B2O3+TiO2) / Al2O3 is 0.05-1.0, preferably (K2O+B2O3+TiO2) / Al2O3 is 0.05-0.8, more preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.7, and further preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.5;

[0043] 2) (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 1.0 or less, preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.7 or less, more preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.5 or less, and further preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.3 or less;

[0044] 3) (ZnO + TiO2) / (MgO + CaO) is 1.0 or less, preferably (ZnO + TiO2) / (MgO + CaO) is 0.8 or less, more preferably (ZnO + TiO2) / (MgO + CaO) is 0.5 or less, and further preferably (ZnO + TiO2) / (MgO + CaO) is 0.2 or less;

[0045] 4) (K2O+B2O3+ZnO) / Na2O is 0.02 to 1.0, preferably (K2O+B2O3+ZnO) / Na2O is 0.05 to 0.8, more preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.7, and further preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.4;

[0046] 5) (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 1.0, preferably (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 0.8, more preferably (MgO + CaO + SrO + BaO) / Na2O is 0.03 to 0.5, and further preferably (MgO + CaO + SrO + BaO) / Na2O is 0.05 to 0.3;

[0047] 6) (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.6, preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.5, more preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.3, and further preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is 0.01~0.15.

[0048] (20) The chemically strengthened glass according to (16) or (17), wherein the components are expressed in weight percentage, wherein: SiO2: 55-62%, preferably SiO2: 57-61%; and / or Al2O3: 10.5-18%, preferably Al2O3: 11-16%; and / or Na2O: 15-22%, preferably Na2O: 16-20%; and / or K2O: 0.5-6%, preferably K2O: 1 ~4.5%; and / or CaO: 0~5%, preferably CaO: 0.1~3%; and / or MgO: 0.5~5%, preferably MgO: 1~3.5%; and / or Li2O: 1~7%, preferably Li2O: 2~6%; and / or B2O3: 0~3%, preferably B2O3: 0~1%; and / or La2O3: 0~2%, preferably La2O3: 0.1~1.5%; and / or Y2O3: 0~1 %, preferably Y2O3: 0-0.5%; and / or Gd2O3: 0-1%, preferably Gd2O3: 0-0.5%; and / or ZrO2: 0-3%, preferably ZrO2: 0-2%; and / or ZnO: 0-3%, preferably ZnO: 0-2%; and / or BaO: 0-3%, preferably BaO: 0-2%; and / or SrO: 0-1%, preferably SrO: 0-0.5%; and / or TiO2: 0-2%, preferably TiO2: 0-1%; and / or Nb2O5: 0-2%, preferably Nb2O5: 0-1%; and / or WO3: 0-2%, preferably WO3: 0-1%; and / or Ta2O5: 0-2%, preferably Ta2O5: 0-1%; and / or clarifier: 0-0.8%, preferably clarifier: 0-0.5%, the clarifier is one or more of Sb2O3, SnO2, and CeO2.

[0049] (21) The chemically strengthened glass according to (16) or (17), wherein the composition does not contain SrO; and / or does not contain Gd2O3; and / or does not contain Nb2O5; and / or does not contain TiO2; and / or does not contain WO3; and / or does not contain Ta2O5; and / or does not contain P2O5; and / or does not contain Sc2O3; and / or does not contain F.

[0050] (22) The chemically strengthened glass according to (16) or (17), wherein the refractive index n of the chemically strengthened glass is d 1.49 to 1.55, preferably 1.50 to 1.54, more preferably 1.51 to 1.53; and / or Abbe number ν d 54 to 61, preferably 55 to 60, more preferably 56 to 59; and / or thermal expansion coefficient α 20 / 120℃ 115×10 -7 / K or less, preferably 110×10 -7 / K or less, more preferably 90×10 -7 / K~102×10 -7 / K; and / or water resistance stability D W 3 or more, preferably 2 or more; and / or acid resistance stability D A Two or more types, preferably one type; and / or transition temperature T g The temperature is 490°C or lower, preferably 480°C or lower, more preferably 470°C or lower; and / or the bubble degree is A0 or higher, preferably A 00 and / or anti-crystallization performance is 2 or more, preferably 1 type; and / or density ρ is 2.70g / cm 3 Below, preferably 2.60g / cm 3 Below, more preferably 2.50g / cm 3 Below; and / or the surface stress is 500 MPa or more, preferably 600 MPa or more, more preferably 650 MPa or more; and / or the depth of the strengthening layer is 20 μm or more, preferably 30 μm or more, more preferably 40-65 μm; and / or the ring-to-ring test breaking strength is 1800 MPa or more, preferably 2000 MPa or more, more preferably 2100 MPa or more; and / or the surface quality is Class 2 or more, preferably Class 1; and / or the ring-to-ring test breaking strength improvement ratio is 1.5 or more, preferably 1.8 or more, more preferably 2.0 or more.

[0051] (23) A glass element made of the chemically strengthened glass described in any one of (16) to (22).

[0052] (24) An optical instrument comprising the chemically strengthened glass described in any one of (16) to (22), or comprising the glass element described in (23).

[0053] (25) A method for manufacturing chemically strengthened glass, the method comprising the steps of forming optical glass, chemically strengthening the optical glass, or processing the optical glass into a glass preform and then chemically strengthening the optical glass.

[0054] (26) The method for manufacturing chemically strengthened glass according to (25), wherein the chemical strengthening treatment comprises the following steps: 1) immersing the optical glass or glass preform in a salt bath composed of a molten sodium salt or a mixed salt containing sodium at a certain temperature for a certain period of time, wherein the chemical strengthening treatment temperature is 320-440°C, preferably 340-420°C, more preferably 360-410°C, and the chemical strengthening treatment time is 1-12 hours, preferably 2-10 hours, and more preferably 4-8 hours; 2) immersing the optical glass or glass preform in a salt bath composed of a molten potassium salt or a mixed salt containing potassium at a certain temperature for a certain period of time, wherein the chemical strengthening treatment temperature is 310-430°C, preferably 330-410°C, more preferably 350-400°C, and the chemical strengthening treatment time is 0.5-5 hours, preferably 0.5-3 hours, and more preferably 0.5-2 hours.

[0055] The beneficial effects of the present invention are: through reasonable component design, the optical glass obtained by the present invention has a desired refractive index and Abbe number, and also has high hardness.

[0056] In some embodiments, the optical glass of the present invention can also be manufactured into chemically strengthened glass to improve its drop resistance, impact resistance and other properties. DETAILED DESCRIPTION

[0057] The following describes in detail embodiments of the optical glass of the present invention. However, the present invention is not limited to the embodiments described below and can be implemented with appropriate modifications within the scope of the present invention. Furthermore, while overlapping descriptions may be omitted as appropriate, this does not limit the scope of the invention. In this specification, glass before chemical strengthening is referred to as optical glass, glass, or pre-strengthening glass, and glass or glass preforms after chemical strengthening are referred to as chemically strengthened glass or post-strengthening glass.

[0058] [Optical glass and chemically strengthened glass]

[0059] The following describes the ranges of the components of the optical glass and chemically strengthened glass of the present invention. Unless otherwise specified, the content, total content, and total content of each component are expressed in weight percentage (wt%). This refers to the weight percentage of the component, total content, and total content relative to the total amount of the glass or chemically strengthened glass material, calculated as an oxide composition. The term "composition calculated as an oxide composition" refers to the case where the oxides, complex salts, and hydroxides used as raw materials for the optical glass or chemically strengthened glass of the present invention decompose upon melting and convert to oxides, with the total amount of the oxide material being taken as 100%.

[0060] Unless otherwise indicated in specific circumstances, the numerical ranges listed in the present invention include upper and lower limits, and "above" and "below" include the endpoint values, as well as all integers and fractions included in the range, without being limited to the specific values ​​listed when defining the range. The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0061] <Essential Components and Optional Components>

[0062] SiO2 is a major component of the glass skeleton and significantly affects the glass's high-temperature viscosity and thermal expansion coefficient. If its content is less than 52%, the glass's thermal expansion coefficient increases, making it difficult to achieve the desired thermal expansion coefficient of the present invention, and the glass's resistance to devitrification decreases. If the SiO2 content exceeds 64%, the glass's transition temperature rises and its high-temperature viscosity increases, hindering the production of large-scale, high-quality glass. Therefore, the SiO2 content in the present invention is 52-64%, preferably 55-62%, and more preferably 57-61%.

[0063] Al2O3 can improve the devitrification resistance and chemical stability of glass, reduce the thermal expansion coefficient, and expand ion exchange channels to enhance chemical strengthening. However, if its content is too high, the glass's meltability deteriorates and its high-temperature viscosity increases. Therefore, in the present invention, the Al2O3 content is 9-20%, preferably 10.5-18%, and more preferably 11-16%.

[0064] In some embodiments, controlling the SiO2 / Al2O3 ratio (SiO2 / Al2O3) within a range of 2.8 to 6.5 can improve the thermal expansion coefficient of optical glass and chemically strengthened glass, enhance the chemical strengthening properties of the optical glass, and increase the fracture strength of the chemically strengthened glass. Therefore, the SiO2 / Al2O3 ratio is preferably 2.8 to 6.5, more preferably 3.0 to 6.0, further preferably 3.5 to 5.5, and even more preferably 3.7 to 5.0.

[0065] Na2O improves the meltability of glass and lowers its transition temperature. It is the primary component used for ion exchange during the chemical strengthening process of the optical glass of the present invention. However, if its content is too high, the chemical stability and anti-vitrification properties of the glass will deteriorate. Therefore, the Na2O content in the present invention is 13-24%, preferably 15-22%, and more preferably 16-20%.

[0066] In some embodiments, controlling the SiO2 / Na2O ratio within a range of 2.5 to 4.5 can improve the hardness of both optical and chemically strengthened glass, while also enhancing the chemical strengthening properties of the optical glass and increasing the surface stress of the chemically strengthened glass. Therefore, a SiO2 / Na2O ratio of 2.5 to 4.5 is preferred, 2.8 to 4.2 is more preferred, and 3.0 to 3.8 is even more preferred.

[0067] K₂O improves the thermal stability and meltability of glass. A moderate amount can help enhance the surface quality of chemically strengthened glass. However, excessive amounts can impair the chemical strengthening properties of the glass and reduce its devitrification resistance. Therefore, in the present invention, the K₂O content is greater than 0 but less than or equal to 8%, preferably 0.5 to 6%, and more preferably 1 to 4.5%.

[0068] Li2O can lower the transition temperature and density of glass and participate in ion exchange during the chemical strengthening process. However, if its content is too high, it can negatively impact the thermal expansion coefficient and anti-devitrification properties of the glass, while also increasing the corrosion of the glass in the melting furnace during the melting process. Therefore, the Li2O content in the present invention is 0.5-9%, preferably 1-7%, and more preferably 2-6%.

[0069] In some embodiments, controlling the ratio of Al2O3 to Li2O (Al2O3 / Li2O) within a range of 2.0 to 20.0 can reduce the thermal expansion coefficient of the glass and chemically strengthened glass while improving the chemical strengthening properties of the glass and the fracture strength of the chemically strengthened glass. Therefore, Al2O3 / Li2O is preferably 2.0 to 20.0, more preferably 3.0 to 15.0, even more preferably 3.5 to 10.0, and even more preferably 3.5 to 7.0.

[0070] B2O3 can improve the meltability and devitrification resistance of glass. However, if the B2O3 content is too high, the chemical stability of the glass will deteriorate and the chemical strengthening properties and thermal expansion coefficient of the glass will be adversely affected. Therefore, the B2O3 content in the present invention is 0-4.5%, preferably 0-3%, and more preferably 0-1%.

[0071] In some embodiments, by controlling the ratio (Al2O3+Na2O) / (SiO2+B2O3) between the combined content of Al2O3 and Na2O (Al2O3+Na2O) and the combined content of SiO2 and B2O3 (SiO2+B2O3) within a range of 0.35 to 0.8, the density of the glass and chemically strengthened glass can be reduced while maintaining excellent bubble density. Therefore, the ratio (Al2O3+Na2O) / (SiO2+B2O3) is preferably 0.35 to 0.8, more preferably 0.4 to 0.75, further preferably 0.42 to 0.7, and even more preferably 0.45 to 0.65.

[0072] La2O3 can increase the refractive index and Abbe number of glass, improving its chemical stability and resistance to devitrification. However, if its content is too high, the chemical strengthening properties and devitrification resistance of the glass will deteriorate. Therefore, the La2O3 content is 0-4%, preferably 0-2%, and more preferably 0.1-1.5%.

[0073] Y2O3 can improve the refractive index and devitrification resistance of glass, but if its content is too high, the chemical stability and chemical strengthening performance of the glass will deteriorate. Therefore, the content of Y2O3 is 0-3%, preferably 0-1%, and more preferably 0-0.5%.

[0074] Gd2O3 can improve the refractive index and chemical stability of glass, but if its content is too high, the glass's resistance to devitrification will deteriorate and its density will increase. Therefore, the Gd2O3 content is 0-3%, preferably 0-1%, and more preferably 0-0.5%. In some embodiments, it is further preferred that Gd2O3 be absent.

[0075] In some embodiments, controlling the ratio of the combined content of La2O3, Y2O3, and Gd2O3 (La2O3+Y2O3+Gd2O3) to the content of Al2O3 ((La2O3+Y2O3+Gd2O3) / Al2O3)) to be below 0.6 can make it easier for optical glass and chemically strengthened glass to achieve desired optical constants while lowering the transition temperature of the optical glass and chemically strengthened glass. Therefore, (La2O3+Y2O3+Gd2O3) / Al2O3 is preferably below 0.6, more preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is below 0.5, further preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is below 0.3, and even more preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is between 0.01 and 0.15.

[0076] ZrO2 can increase the refractive index and chemical stability of glass, reduce the thermal expansion coefficient of glass, and optimize high-temperature viscosity. However, when the ZrO2 content is too high, the glass's resistance to devitrification and meltability are reduced. Therefore, the ZrO2 content is 0-5%, preferably 0-3%, and more preferably 0-2%.

[0077] ZnO can improve the meltability of glass and adjust its high-temperature viscosity. However, if its content is too high, the chemical stability of the glass will decrease and its chemical strengthening performance will be adversely affected. Therefore, the ZnO content is 0-4%, preferably 0-3%, and more preferably 0-2%.

[0078] In some embodiments, controlling the ratio of the combined content of K2O, B2O3, and ZnO (K2O+B2O3+ZnO) to the content of Na2O ((K2O+B2O3+ZnO) / Na2O)) within a range of 0.02 to 1.0 can improve the acid resistance of optical glass and chemically strengthened glass while also enhancing the chemical strengthening performance of the optical glass and increasing the depth of the strengthened layer of the chemically strengthened glass. Therefore, (K2O+B2O3+ZnO) / Na2O is preferably 0.02 to 1.0, more preferably (K2O+B2O3+ZnO) / Na2O is 0.05 to 0.8, further preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.7, and even more preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.4.

[0079] MgO can improve the light transmittance of glass and reduce its density, but if its content is too high, the chemical stability of the glass will deteriorate. Therefore, in the present invention, the MgO content is greater than 0 but less than or equal to 7%, preferably 0.5-5%, and more preferably 1-3.5%.

[0080] CaO can improve the mechanical properties of glass, but if its content is too high, the anti-vitrification performance of the glass will decrease. Therefore, the CaO content is 0-7%, preferably 0-5%, and more preferably 0.1-3%.

[0081] In some embodiments, controlling the ratio of the Al2O3 content to the combined MgO and CaO content (MgO+CaO) (Al2O3 / (MgO+CaO)) within a range of 2.0 to 15.0 can improve the acid resistance of both optical and chemically strengthened glass, while also enhancing the chemical strengthening properties of the optical glass and the fracture strength improvement ratio of the chemically strengthened glass. Therefore, the Al2O3 / (MgO+CaO) ratio is preferably 2.0 to 15.0, more preferably 2.5 to 12.0, even more preferably 3.0 to 10.0, and even more preferably 4.5 to 9.3.

[0082] SrO can adjust the high-temperature viscosity and solubility of glass, but if its content is too high, the chemical stability of the glass will be reduced. Therefore, the SrO content is 0-3%, preferably 0-1%, and more preferably 0-0.5%. In some embodiments, it is further preferred that SrO is not contained.

[0083] BaO can increase the refractive index of glass and adjust its high-temperature viscosity, but if its content is too high, the thermal expansion coefficient and density of the glass will increase. Therefore, the BaO content in the present invention is 0-4%, preferably 0-3%, and more preferably 0-2%.

[0084] In some embodiments, controlling the ratio of the total content of MgO, CaO, SrO, and BaO (MgO+CaO+SrO+BaO) to the content of Na2O ((MgO+CaO+SrO+BaO) / Na2O)) within the range of 0.01 to 1.0 can reduce the transition temperature of the optical glass and chemically strengthened glass while improving the chemical strengthening performance of the optical glass and the surface quality of the chemically strengthened glass. Therefore, (MgO+CaO+SrO+BaO) / Na2O is preferably 0.01 to 1.0, more preferably (MgO+CaO+SrO+BaO) / Na2O is 0.01 to 0.8, further preferably (MgO+CaO+SrO+BaO) / Na2O is 0.03 to 0.5, and even more preferably (MgO+CaO+SrO+BaO) / Na2O is 0.05 to 0.3.

[0085] TiO2 can increase the refractive index and dispersion of glass and adjust the thermal expansion coefficient of glass. However, if the TiO2 content is too high, the light transmittance of the glass will drop rapidly, and the thermal expansion coefficient of the glass will not meet the design requirements. Therefore, the TiO2 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that TiO2 is not contained.

[0086] In some embodiments, controlling the ratio of the combined content of K2O, B2O3, and TiO2 (K2O+B2O3+TiO2) to the content of Al2O3 ((K2O+B2O3+TiO2) / Al2O3)) within a range of 0.05 to 1.0 can improve the water resistance of optical glass and chemically strengthened glass while also enhancing the chemical strengthening performance of the optical glass and the fracture strength enhancement ratio of the chemically strengthened glass. Therefore, (K2O+B2O3+TiO2) / Al2O3 is preferably 0.05 to 1.0, more preferably (K2O+B2O3+TiO2) / Al2O3 is 0.05 to 0.8, further preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1 to 0.7, and even more preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1 to 0.5.

[0087] In some embodiments, controlling the ratio (ZnO+TiO) / (MgO+CaO) between the combined content of ZnO and TiO to the combined content of MgO and CaO, MgO+CaO, to 1.0 or less can prevent a decrease in the hardness of the optical glass and chemically strengthened glass while improving the chemical strengthening properties of the optical glass and increasing the surface stress of the chemically strengthened glass. Therefore, (ZnO+TiO) / (MgO+CaO) is preferably 1.0 or less, more preferably 0.8 or less, even more preferably 0.5 or less, and even more preferably 0.2 or less.

[0088] Nb2O5 is a high-refractive, high-dispersion component that can improve the refractive index and devitrification resistance of glass. However, if its content is too high, it is difficult to achieve the desired optical constants and the chemical stability of the glass deteriorates. Therefore, the Nb2O5 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Nb2O5 be absent.

[0089] WO3 is a high-refractive, high-dispersion component that can increase the refractive index and devitrification resistance of glass. However, if its content is too high, it becomes difficult to achieve the desired optical constants and the light transmittance of the glass decreases. Therefore, the WO3 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, WO3 is preferably absent.

[0090] Ta2O5 can increase the refractive index of glass, but high Ta2O5 content significantly increases the cost of the glass, degrades its melting properties, and increases its density. Therefore, the Ta2O5 content is 0-3%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that Ta2O5 be absent.

[0091] In some embodiments, the ratio of the total content of TiO2, Nb2O5, WO3, and Ta2O5 (TiO2+Nb2O5+WO3+Ta2O5) to the total content of MgO and CaO (MgO+CaO) (TiO2+Nb2O5+WO3+Ta2O5) / (MgO+CaO) is controlled to be below 1.0. This can prevent the deterioration of the anti-crystallization performance and acid resistance of the optical glass and chemically strengthened glass, optimize the chemical strengthening performance of the optical glass, and increase the depth of the strengthening layer of the chemically strengthened glass. Therefore, it is preferred that (TiO2+Nb2O5+WO3+Ta2O5) / (MgO+CaO) is less than 1.0, it is more preferred that (TiO2+Nb2O5+WO3+Ta2O5) / (MgO+CaO) is less than 0.7, it is further preferred that (TiO2+Nb2O5+WO3+Ta2O5) / (MgO+CaO) is less than 0.5, and it is further preferred that (TiO2+Nb2O5+WO3+Ta2O5) / (MgO+CaO) is less than 0.3.

[0092] In the present invention, 0-1% of one or more components of Sb2O3, SnO2, and CeO2 are contained as clarifiers to improve the clarification effect of the glass. Preferably, the content of the clarifier is 0-0.8%, more preferably 0-0.5%.

[0093] <Components that should not be contained>

[0094] P2O5 tends to form a differential phase within the glass, which scatters some short wavelengths, reducing the light transmittance of optical glass and chemically strengthened glass. Therefore, in some embodiments, it is preferred that P2O5 be excluded.

[0095] Sc2O3 is detrimental to the properties of the glass of the present invention and chemically strengthened glass, such as the transition temperature, and has an adverse effect on the surface quality of chemically strengthened glass. Therefore, in some embodiments, it is preferred that Sc2O3 is not contained.

[0096] F (fluorine) will volatilize during the glass melting process, causing the glass components to become unstable and the quality of the glass to decrease. Therefore, in some embodiments, it is preferred that F is not contained.

[0097] Oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo, even when contained alone or in combination in small amounts, can color the glass and produce absorption at specific wavelengths in the visible light region, thereby weakening the property of the present invention of increasing visible light transmittance. Therefore, it is preferred that the glass, particularly for glass requiring transmittance at wavelengths in the visible light region, substantially contain no such components.

[0098] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly regulated as hazardous chemicals in recent years. Environmental protection measures are essential not only during glass manufacturing but also during processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to virtually eliminate these oxides, except where they are unavoidably present. This ensures that the glass contains virtually no pollutants. Therefore, the glass of the present invention can be manufactured, processed, and disposed of even without implementing specific environmental measures.

[0099] In order to achieve environmental friendliness, the glass and chemically strengthened glass of the present invention preferably do not contain As2O3 and PbO.

[0100] The terms "does not contain" or "0%" as used herein mean that the compound, molecule, element, or the like is not intentionally added as a raw material to the glass or chemically strengthened glass of the present invention. However, the raw materials and / or equipment used to produce the glass or chemically strengthened glass may contain certain unintentionally added impurities or components, which may be present in small or trace amounts in the final glass or chemically strengthened glass. Such situations are also within the scope of protection of the present invention.

[0101] Next, the properties of the optical glass and chemically strengthened glass of the present invention will be described.

[0102] <Refractive Index and Abbe Number>

[0103] Refractive index of optical glass / chemically strengthened glass (n d ) and Abbe number (ν d ) According to the national standard GB / T

[0104] 7962.1-2010》.

[0105] <Coefficient of Thermal Expansion>

[0106] Thermal expansion coefficient of optical glass / chemically strengthened glass (α 20 / 120℃ ) Data at 20-120°C were tested according to the method specified in the national standard GB / T 7962.16-2010.

[0107] <Acid resistance stability>

[0108] Acid resistance stability of optical glass / chemically strengthened glass (D A (Powder method) Tested in accordance with the method specified in the national standard "GB / T17129". In this specification, acid resistance stability may be referred to as acid resistance or acid stability.

[0109] <Water resistance stability>

[0110] Water resistance stability of optical glass / chemically strengthened glass (D W (Powder method) Tested in accordance with the method specified in the national standard "GB / T17129". In this specification, water resistance stability may be referred to as water resistance or water resistance stability.

[0111] <Transition Temperature>

[0112] Transition temperature of optical glass / chemically strengthened glass (T g ) Tested according to the method specified in the national standard "GB / T 7962.16-2010".

[0113] <density>

[0114] The density (ρ) of optical glass / chemically strengthened glass is tested according to the method specified in the national standard "GB / T 7962.20-2010." The lower the density of optical glass / chemically strengthened glass, the more conducive it is to achieving lightweight end-use applications.

[0115] <Knoop hardness>

[0116] Knoop hardness of optical glass / chemically strengthened glass (H K ) Tested according to the test method specified in the national standard "GB / T 7962.18-2010".

[0117] <Bubble Degree>

[0118] The bubble density of optical glass / chemically strengthened glass is tested according to the method specified in the Chinese standard "GB / T 7962.8-2010".

[0119] <Anti-crystallization performance>

[0120] The anti-crystallization performance described in the present invention represents the ease with which crystals precipitate from the glass during the glassmaking process using the melt process. The stronger the anti-crystallization performance, the less likely the glass will crystallize during the glassmaking process, and the more suitable it is for industrial production.

[0121] The anti-devitrification performance of the optical glass / chemically strengthened glass of the present invention was measured using a gradient temperature furnace method. Optical glass / chemically strengthened glass samples free of inherent defects were placed in a gradient temperature furnace with a temperature gradient ranging from 900°C to 1300°C. After 4 hours of incubation, the samples were removed and the boundary between the crystallized and non-crystallized regions of the sample was observed. The temperature of the gradient temperature furnace at this boundary was recorded. Based on the temperature values, the anti-devitrification performance of the optical glass / chemically strengthened glass was classified into five categories as shown in Table 1 below:

[0122] Table 1.

[0123] Classification criteria describe Category 1 Interface temperature <1100℃ Category 2 The junction temperature is 1100-1150℃ Category 3 The junction temperature is 1150-1200℃ Category 4 The junction temperature is 1200-1250℃ 5 categories Junction temperature>1250℃

[0124] <Surface stress>

[0125] The surface stress of chemically strengthened glass is tested according to the method specified in the Chinese standard "GB / T 18144-2008".

[0126] <Reinforcement Layer Depth>

[0127] The depth of the strengthening layer in chemically strengthened glass is determined using energy dispersive spectroscopy. A cross-section of the chemically strengthened glass is polished and then sputtered with a gold layer using a small ion sputtering device. The energy dispersive spectroscopy of the glass cross-section is then measured using a scanning electron microscope (SEM) line scan method. The test line is perpendicular to the glass surface, and the test elements are Na and / or K.

[0128] During the test, first intercept the line scan results, define x at the position with the highest intensity of the Na or K element spectrum equal to 0, and then fit the line scan results according to the following formula:

[0129]

[0130] Where erf is the error function, D is the diffusion coefficient, and t is the diffusion time. Compared to actual test results, the fitted line has the advantage of being free of fluctuations caused by random test errors. The fitting process yields the n1 and n0 parameters. The x value corresponding to n(x) = n0 + 0.02 × (n1 - n0) on the fitted line is defined as the depth of the glass strengthening layer, denoted as DOL.

[0131] <Surface Quality>

[0132] The surface quality of chemically strengthened glass is a crucial characteristic in its application. Poor surface quality not only affects the performance of chemically strengthened glass but also reduces the yield of subsequent processes based on the strengthened glass. Surface strengthening was performed on samples with polished surfaces. The surface quality of the polished surfaces after strengthening was visually observed and categorized into four categories according to Table 2 below.

[0133] Table 2.

[0134] Classification criteria describe Category 1 No adverse effects were observed Category 2 Spot defects are visible under strong light Category 3 Point-like or surface-like defects are visible under natural light Category 4 Severe surface defects, glass warping, or glass loss of transparency

[0135] <Ring-to-ring test breaking strength>

[0136] The ring-to-ring test is a commonly used mechanical strength test method used to evaluate the fracture strength and impact resistance of glass. In the present invention, the upper and lower pressure rings have diameters of 15 mm and 30 mm, respectively, a ring wall thickness of 0.75 mm, and a ring height of 3 mm. The centers of the upper and lower rings are vertically aligned.

[0137] The test sample size in this invention is 45mm × 45mm × 1mm. Before testing, the optical glass / chemically strengthened glass sample is first inspected for appearance and functionality to ensure it is free of cracks, notches, or other detrimental defects. The sample is then centered on a large circular ring and pressed downward with a small circular ring at a rate of 1.2mm / min until the sample breaks. The maximum fracture strength at the split is recorded. In this invention, the ring-to-ring fracture strength may be referred to as the fracture strength.

[0138] <Ring-to-ring test fracture strength improvement ratio>

[0139] The fracture strength of optical glass (before strengthening) and chemically strengthened glass (after strengthening) was tested using a ring-to-ring method. To minimize the impact of processing quality on the strength test, 10 pieces of optical glass with identical components were processed using the same process and conditions into samples measuring 45 mm × 45 mm × 1 mm. Both surfaces were mechanically polished. Five of the optical glass pieces were then placed in the same salt bath and subjected to the same chemical strengthening process to produce five chemically strengthened glass pieces. The average fracture strength of each of the five optical and five chemically strengthened glass samples was measured. The average fracture strength of the optical glass was denoted as σ1, and the average fracture strength of the chemically strengthened glass was denoted as σ2. The ratio of fracture strength improvement after strengthening was σ2 / σ1. The average of these results was the fracture strength improvement ratio of the chemically strengthened glass of the present invention in the ring-to-ring test, referred to herein as the fracture strength improvement ratio.

[0140] The optical glass of the present invention has the following properties:

[0141] 1) In some embodiments, the refractive index (n d ) is 1.49 to 1.55, preferably 1.50 to 1.54, and more preferably 1.51 to 1.53.

[0142] 2) In some embodiments, the Abbe number (ν d ) is 54-61, preferably 55-60, more preferably 56-59.

[0143] 3) In some embodiments, the thermal expansion coefficient (α 20 / 120℃ ) is 115×10 -7 / K or less, preferably 110×10 -7 / K or less, more preferably 90×10 -7 / K~102×10 -7 / K.

[0144] 4) In some embodiments, the acid resistance stability (D A ) is 2 or more types, preferably 1 type.

[0145] 5) In some embodiments, the water resistance stability (D W ) is 3 or more, preferably 2 or more.

[0146] 6) In some embodiments, the transition temperature (T g ) is 490°C or lower, preferably 480°C or lower, more preferably 470°C or lower.

[0147] 7) In some embodiments, the density (ρ) of the optical glass of the present invention is 2.70 g / cm 3 Below, preferably 2.60g / cm 3 Below, more preferably 2.50g / cm 3 the following.

[0148] 8) In some embodiments, the Knoop hardness (H K ) is 540×10 7 Pa or more, preferably 550×10 7 Pa or more, more preferably 560×10 7 Pa~590×10 7 Pa.

[0149] 9) In some embodiments, the bubble degree of the optical glass of the present invention is A0 or above, preferably A 00 class.

[0150] 10) In some embodiments, the anti-crystallization performance of the optical glass of the present invention is Class 2 or above, preferably Class 1.

[0151] The chemically strengthened glass of the present invention has the following properties:

[0152] 1) In some embodiments, the refractive index (n d ) is 1.49 to 1.55, preferably 1.50 to 1.54, and more preferably 1.51 to 1.53.

[0153] 2) In some embodiments, the Abbe number (ν d ) is 54-61, preferably 55-60, more preferably 56-59.

[0154] 3) In some embodiments, the thermal expansion coefficient (α 20 / 120℃ ) is 115×10 -7 / K or less, preferably 110×10 -7 / K or less, more preferably 90×10 -7 / K~102×10 -7 / K.

[0155] 4) In some embodiments, the acid resistance stability (D A ) is 2 or more types, preferably 1 type.

[0156] 5) In some embodiments, the water resistance stability (D W ) is 3 or more, preferably 2 or more.

[0157] 6) In some embodiments, the transition temperature (T g ) is 490°C or lower, preferably 480°C or lower, more preferably 470°C or lower.

[0158] 7) In some embodiments, the density (ρ) of the chemically strengthened glass of the present invention is 2.70 g / cm 3 Below, preferably 2.60g / cm 3 Below, more preferably 2.50g / cm 3 the following.

[0159] 8) In some embodiments, the bubble degree of the chemically strengthened glass of the present invention is A0 or above, preferably A 00 class.

[0160] 9) In some embodiments, the anti-devitrification performance of the chemically strengthened glass of the present invention is Class 2 or above, preferably Class 1.

[0161] 10) In some embodiments, the surface stress of the chemically strengthened glass of the present invention is 500 MPa or greater, preferably 600 MPa or greater, and more preferably 650 MPa or greater.

[0162] 11) In some embodiments, the depth of the strengthening layer of the chemically strengthened glass of the present invention is 20 μm or more, preferably 30 μm or more, and more preferably 40 to 65 μm.

[0163] 12) In some embodiments, the chemically strengthened glass of the present invention has a ring-to-ring test fracture strength of 1800 MPa or greater, preferably 2000 MPa or greater, and more preferably 2100 MPa or greater.

[0164] 13) In some embodiments, the surface quality of the chemically strengthened glass of the present invention is Class 2 or higher, preferably Class 1.

[0165] 14) In some embodiments, the chemically strengthened glass of the present invention has a ring-to-ring test fracture strength improvement ratio of 1.5 or greater, preferably 1.8 or greater, and more preferably 2.0 or greater.

[0166] [Methods for producing optical glass and chemically strengthened glass]

[0167] The optical glass of the present invention is manufactured as follows: The optical glass of the present invention uses oxides, hydroxides, various salts (carbonates, nitrates, sulfates, etc.), boric acid, etc. as raw materials. After the ingredients are prepared according to conventional methods, the prepared furnace materials are placed in a melting furnace at 1250-1500°C for melting. After clarification, stirring, and homogenization, a homogeneous molten glass free of bubbles and undissolved matter is obtained. The molten glass is cast in a mold and annealed. Those skilled in the art can appropriately select the raw materials, process methods, and process parameters according to actual needs.

[0168] The optical glass of the present invention can also be formed by well-known methods. In some embodiments, the optical glass described herein can be manufactured into glass preforms, including but not limited to sheets, lenses, prisms, and the like, through various processes. Such processes include but are not limited to slot drawing, float glass, roller pressing, and other processes known in the art for forming sheets, lenses, and prisms. Alternatively, the optical glass can be formed by float or roller pressing methods known in the art. The optical glass and glass preforms of the present invention can have any reasonably useful thickness, shape, or structure, such as 2D, 2.5D, or 3D.

[0169] The optical glass of the present invention can be manufactured into a glass preform of a sheet material by grinding or polishing, but the method of manufacturing the glass preform is not limited to these methods.

[0170] A glass preform can be produced from the produced optical glass using, for example, grinding, or compression molding such as re-hot pressing or precision stamping. Specifically, a glass preform can be produced by mechanical processing such as grinding or lapping the optical glass, or by hot pressing a preform produced from the optical glass for compression molding and then grinding it, or by precision stamping the preform produced by grinding. It should be noted that the methods for producing a glass preform are not limited to the above methods.

[0171] The chemically strengthened glass of the present invention is obtained by subjecting the optical glass or glass preform of the present invention to a chemical strengthening treatment. The chemical strengthening of the present invention comprises immersing the optical glass or glass preform in a salt bath composed of molten potassium and / or sodium salts at a certain temperature (i.e., the chemical strengthening treatment temperature) for a certain period of time (i.e., the chemical strengthening treatment time).

[0172] The chemical strengthening treatment of the optical glass or glass preform of the present invention can be performed using a one-step strengthening method or a two-step strengthening method. The one-step strengthening method involves immersing the optical glass or glass preform in a salt bath composed of molten potassium salt and / or sodium salt at a certain temperature for a certain period of time. The two-step strengthening method involves first immersing the optical glass or glass preform in a salt bath composed of molten sodium salt or a sodium-containing mixed salt at a certain temperature for a certain period of time, and then immersing the optical glass or glass preform in a salt bath composed of molten potassium salt or a potassium-containing mixed salt at a certain temperature for a certain period of time.

[0173] The present invention preferably adopts a two-step strengthening method for chemical strengthening treatment, and the two-step strengthening method of the present invention comprises the following steps:

[0174] The first step of chemical strengthening involves immersing the optical glass or glass preform in a salt bath composed of a molten sodium salt or a sodium-containing mixed salt at a certain temperature for a certain period of time. The salt bath composed of the sodium salt or sodium-containing mixed salt can be pure NaNO3 molten salt or a mixed molten salt containing NaNO3 and KNO3 or other known common salt bath components and salt bath additives. This first step of chemical strengthening allows for ion exchange in the optical glass or glass preform of the present invention to achieve a deep strengthening layer, thereby increasing the optical glass's resistance to fracture, puncture, and crack growth. With chemical strengthening, the higher the chemical strengthening temperature, the faster the ion diffusion in the glass and the deeper the strengthening layer. However, excessively high chemical strengthening temperatures can easily cause stress relaxation and, at high temperatures, can lead to surface damage to the optical glass due to salt bath corrosion, affecting subsequent performance. Excessively low chemical strengthening temperatures can slow ion diffusion, resulting in a shallow strengthening layer and ineffective strengthening. Therefore, the first step of chemical strengthening in the present invention is preferably performed at a temperature of 320-440°C, more preferably 340-420°C, and even more preferably 360-410°C. Properly increasing the chemical strengthening treatment time can increase the depth of the strengthening layer and enhance the strengthening effect. However, excessive chemical strengthening treatment time can easily lead to the volatilization and decomposition of the salt bath, resulting in impurities adhering to the optical glass surface, and significantly shorten the salt bath's service life. Therefore, the first step of the chemical strengthening treatment in the present invention is preferably performed for 1 to 12 hours, more preferably 2 to 10 hours, and even more preferably 4 to 8 hours.

[0175] The second step of chemical strengthening involves immersing the optical glass or glass preform in a salt bath composed of a molten potassium salt or a potassium-containing mixed salt at a certain temperature for a certain period of time. The salt bath composed of the potassium salt or potassium-containing mixed salt can be a molten salt of pure KNO3 or a mixed molten salt containing KNO3 and NaNO3 or other known common salt bath components and salt bath additives. Using this second step of chemical strengthening can achieve ion exchange with greater surface stress in the optical glass or glass preform of the present invention, thereby increasing the drop and impact resistance of the optical glass. For chemical strengthening by Na-K ion exchange, the lower the chemical strengthening treatment temperature, the slower the ion diffusion in the glass, the lower the strengthening layer, the higher the surface ion concentration, and the easier it is to achieve high surface stress. However, if the chemical strengthening treatment temperature is too low, the ion exchange coefficient of the glass is reduced, resulting in the inability to achieve a usable strengthening layer. If the chemical strengthening treatment temperature is too high, stress relaxation is likely to occur, reducing surface stress. The salt bath is also prone to volatile decomposition, which can easily lead to impurities adhering to the optical glass surface and significantly shortening the service life of the salt bath. Therefore, the temperature of the second step chemical strengthening treatment in the present invention is preferably 310-430°C, more preferably 330-410°C, and further preferably 350-400°C. The shorter the chemical strengthening treatment time, the shallower the depth of the strengthening layer and the greater the surface stress. However, if the chemical strengthening treatment time is too short, the strengthening effect will not be obvious and no effective stress layer will be obtained. If the chemical strengthening treatment time is too long, it will easily lead to stress relaxation, as well as surface damage to the glass due to severe volatilization and decomposition of the salt bath, surface adhesion precipitation and other defects. Therefore, the glass according to the present invention should be expected to have a shorter chemical strengthening treatment time to obtain a larger surface stress and prevent salt bath deterioration. The second step chemical strengthening treatment time according to the present invention is preferably 0.5-5 hours, more preferably 0.5-3 hours, and further preferably 0.5-2 hours.

[0176] [Glass preforms and glass elements]

[0177] A glass preform can be produced from the produced optical glass using methods such as direct drop molding, grinding, or compression molding such as hot pressing. Specifically, the molten optical glass can be directly drop molded into a precision glass preform, or the glass preform can be produced through mechanical processing such as grinding and lapping. Alternatively, the glass preform can be produced by forming a preform for compression molding from the optical glass, hot pressing the preform, and then grinding the preform. It should be noted that the methods for producing the glass preform are not limited to the methods described above.

[0178] As described above, the optical glass and chemically strengthened glass of the present invention are useful for various glass elements and optical designs. In particular, it is particularly preferable to form a preform from the optical glass of the present invention and use this preform to perform re-hot press molding, precision press molding, etc. to produce glass elements such as lenses and prisms, or to manufacture glass elements from the chemically strengthened glass of the present invention.

[0179] The glass preforms and glass elements of the present invention are both formed from the optical glass or chemically strengthened glass of the present invention. The glass preforms of the present invention possess the excellent properties of optical glass, and the glass elements of the present invention possess the excellent properties of optical glass or chemically strengthened glass, enabling the provision of various glass elements such as lenses and prisms with high optical value.

[0180] Examples of the lens include various lenses having spherical or aspherical lens surfaces, such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens.

[0181] [Optical Instruments]

[0182] The optical glass, chemically strengthened glass, glass preforms, and glass components of the present invention can be used to manufacture optical instruments such as photographic equipment, video equipment, display equipment, and monitoring equipment. The optical glass, chemically strengthened glass, glass preforms, and glass components of the present invention are suitable for use in automotive lighting equipment and optical equipment, and are used in automotive and other fields. The optical glass, chemically strengthened glass, glass preforms, and glass components of the present invention are suitable for use in optical instruments such as micro-projectors, micro-imaging (video / photography), micro-illumination, optical waveguides, and AR imaging systems.

[0183] Example

[0184] <Optical Glass Example>

[0185] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0186] This embodiment uses the above-mentioned optical glass manufacturing method to obtain optical glasses having the compositions shown in Tables 3 and 4. In addition, the properties of each glass were measured using the testing method described in the present invention, and the measurement results are shown in Tables 3 and 4.

[0187] Table 3.

[0188]

[0189]

[0190] Table 4.

[0191]

[0192]

[0193] <Chemically Strengthened Glass Example>

[0194] In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting examples are provided.

[0195] In this example, the chemically strengthened glass production method described above was used to obtain chemically strengthened glass having the compositions shown in Tables 5 and 6. Furthermore, the properties of each chemically strengthened glass were measured using the testing method described in the present invention, and the measurement results are shown in Tables 5 and 6.

[0196] Table 5.

[0197]

[0198]

[0199]

[0200] Table 6.

[0201]

[0202]

[0203] <Glass Preform Example>

[0204] The glass obtained from optical glass examples 1 to 10# is used to make preforms of various lenses, prisms, etc., such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, by means of, for example, grinding processing, or molding methods such as re-hot pressing and precision stamping.

[0205] <Glass Element Example>

[0206] The preforms obtained from the above-mentioned glass preform embodiments are annealed to reduce the internal stress of the glass and fine-tune the refractive index so that the optical properties such as the refractive index reach the desired values.

[0207] Next, each preform is ground and polished to produce various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The surfaces of the resulting glass elements may also be coated with an anti-reflection film.

[0208] <Optical Instrument Example>

[0209] The glass elements made from the above-mentioned glass element embodiments are optically designed and formed into optical components or optical assemblies using one or more glass elements, which can be used, for example, in imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, photolithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims

1. Optical glass, characterized in that Its components, expressed in weight percentage, include: SiO2: 52-64%; Al2O3: 9-20%; Na2O: 13-24%; K2O: greater than 0 but less than or equal to 8%; Li2O: 0.5-9%; MgO: greater than 0 but less than or equal to 7%, wherein SiO2 / Na2O is 2.5-4.

5.

2. The optical glass according to claim 1, wherein Its components, expressed in weight percentage, further contain: CaO: 0-7%; and / or B2O3: 0-4.5%; and / or La2O3: 0-4%; and / or Y2O3: 0-3%; and / or Gd2O3: 0-3%; and / or ZrO2: 0-5%; and / or ZnO: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-3%; and / or TiO2: 0-3%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or a clarifier: 0-1%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that The components include SiO2, Al2O3, Na2O, K2O, Li2O and MgO, and the components are expressed in weight percentage, wherein SiO2 / Na2O is 2.5 to 4.5, and the refractive index of the optical glass is n d is 1.49~1.55, Abbe number ν d 54~61, Knoop hardness H K 540×10 7 Pa or above.

4. The optical glass according to claim 3, wherein The composition is expressed in weight percentage and contains: SiO2: 52-64%; and / or Al2O3: 9-20%; and / or Na2O: 13-24%; and / or K2O: greater than 0 but less than or equal to 8%; and / or Li2O: 0.5-9%; and / or MgO: greater than 0 but less than or equal to 7%; and / or CaO: 0-7%; and / or B2O3: 0-4.5%; and / or La2O3: 0-4%; and / or Y2O3: 0 ~3%; and / or Gd2O3: 0~3%; and / or ZrO2: 0~5%; and / or ZnO: 0~4%; and / or BaO: 0~4%; and / or SrO: 0~3%; and / or TiO2: 0~3%; and / or Nb2O5: 0~3%; and / or WO3: 0~3%; and / or Ta2O5: 0~3%; and / or clarifier: 0~1%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

5. The optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following five conditions: 1) SiO2 / Na2O is 2.8 to 4.2, preferably SiO2 / Na2O is 3.0 to 3.8; 2) SiO2 / Al2O3 is 2.8 to 6.5, preferably SiO2 / Al2O3 is 3.0 to 6.0, more preferably SiO2 / Al2O3 is 3.5 to 5.5, and further preferably SiO2 / Al2O3 is 3.7 to 5.0; 3) (Al2O3+Na2O) / (SiO2+B2O3) is 0.35-0.8, preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.4-0.75, more preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.42-0.7, and further preferably (Al2O3+Na2O) / (SiO2+B2O3) is 0.45-0.65; 4) Al2O3 / (MgO+CaO) is 2.0 to 15.0, preferably Al2O3 / (MgO+CaO) is 2.5 to 12.0, more preferably Al2O3 / (MgO+CaO) is 3.0 to 10.0, and further preferably Al2O3 / (MgO+CaO) is 4.5 to 9.3; 5) Al2O3 / Li2O is 2.0 to 20.0, preferably Al2O3 / Li2O is 3.0 to 15.0, more preferably Al2O3 / Li2O is 3.5 to 10.0, and further preferably Al2O3 / Li2O is 3.5 to 7.

0.

6. The optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following six conditions: 1) (K2O+B2O3+TiO2) / Al2O3 is 0.05-1.0, preferably (K2O+B2O3+TiO2) / Al2O3 is 0.05-0.8, more preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.7, and further preferably (K2O+B2O3+TiO2) / Al2O3 is 0.1-0.5; 2) (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 1.0 or less, preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.7 or less, more preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.5 or less, and further preferably (TiO2 + Nb2O5 + WO3 + Ta2O5) / (MgO + CaO) is 0.3 or less; 3) (ZnO + TiO2) / (MgO + CaO) is 1.0 or less, preferably (ZnO + TiO2) / (MgO + CaO) is 0.8 or less, more preferably (ZnO + TiO2) / (MgO + CaO) is 0.5 or less, and further preferably (ZnO + TiO2) / (MgO + CaO) is 0.2 or less; 4) (K2O+B2O3+ZnO) / Na2O is 0.02 to 1.0, preferably (K2O+B2O3+ZnO) / Na2O is 0.05 to 0.8, more preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.7, and further preferably (K2O+B2O3+ZnO) / Na2O is 0.1 to 0.4; 5) (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 1.0, preferably (MgO + CaO + SrO + BaO) / Na2O is 0.01 to 0.8, more preferably (MgO + CaO + SrO + BaO) / Na2O is 0.03 to 0.5, and further preferably (MgO + CaO + SrO + BaO) / Na2O is 0.05 to 0.3; 6) (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.6, preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.5, more preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is less than 0.3, and further preferably (La2O3+Y2O3+Gd2O3) / Al2O3 is 0.01~0.

15.

7. The optical glass according to any one of claims 1 to 4, characterized in that: The components are expressed in weight percentage, wherein: SiO2: 55-62%, preferably SiO2: 57-61%; and / or Al2O3: 10.5-18%, preferably Al2O3: 11-16%; and / or Na2O: 15-22%, preferably Na2O: 16-20%; and / or K2O: 0.5-6%, preferably K2O: 1-4.5%; and / or CaO: 0-5%, preferably Select CaO: 0.1-3%; and / or MgO: 0.5-5%, preferably MgO: 1-3.5%; and / or Li2O: 1-7%, preferably Li2O: 2-6%; and / or B2O3: 0-3%, preferably B2O3: 0-1%; and / or La2O3: 0-2%, preferably La2O3: 0.1-1.5%; and / or Y2O3: 0-1%, preferably Y2O3: 0-0 .5%; and / or Gd2O3: 0-1%, preferably Gd2O3: 0-0.5%; and / or ZrO2: 0-3%, preferably ZrO2: 0-2%; and / or ZnO: 0-3%, preferably ZnO: 0-2%; and / or BaO: 0-3%, preferably BaO: 0-2%; and / or SrO: 0-1%, preferably SrO: 0-0.5%; and / or TiO2: 0-2%, preferably Select TiO2: 0-1%; and / or Nb2O5: 0-2%, preferably Nb2O5: 0-1%; and / or WO3: 0-2%, preferably WO3: 0-1%; and / or Ta2O5: 0-2%, preferably Ta2O5: 0-1%; and / or clarifier: 0-0.8%, preferably clarifier: 0-0.5%, wherein the clarifier is one or more of Sb2O3, SnO2, and CeO2.

8. The optical glass according to any one of claims 1 to 4, characterized in that: Its components do not contain SrO; and / or do not contain Gd2O3; and / or do not contain Nb2O5; and / or do not contain TiO2; and / or do not contain WO3; and / or do not contain Ta2O5; and / or do not contain P2O5; and / or do not contain Sc2O3; and / or do not contain F.

9. The optical glass according to any one of claims 1 to 4, characterized in that: The refractive index n of the optical glass d 1.49 to 1.55, preferably 1.50 to 1.54, more preferably 1.51 to 1.53; Abbe number ν d It is 54-61, preferably 55-60, and more preferably 56-59.

10. The optical glass according to any one of claims 1 to 4, characterized in that: The thermal expansion coefficient of the optical glass is α 20 / 120℃ 115×10 -7 / K or less, preferably 110×10 -7 / K or less, more preferably 90×10 -7 / K~102×10 -7 / K; and / or water resistance stability D W 3 or more, preferably 2 or more; and / or acid resistance stability D A 2 or more, preferably 1; and / or Knoop hardness H K 540×10 7 Pa or more, preferably 550×10 7 Pa or more, more preferably 560×10 7 Pa~590×10 7 Pa; and / or transition temperature T g The temperature is 490°C or lower, preferably 480°C or lower, more preferably 470°C or lower; and / or the bubble degree is A0 or higher, preferably A 00 and / or anti-crystallization performance is 2 or more, preferably 1 type; and / or density ρ is 2.70g / cm 3 Below, preferably 2.60g / cm 3 Below, more preferably 2.50g / cm 3 the following.

11. A glass preform, characterized in that Made of the optical glass according to any one of claims 1 to 10.

12. Chemically strengthened glass, characterized in that The optical glass is made of any one of claims 1 to 10, or the glass preform is made of claim 11.

13. The chemically strengthened glass according to claim 12, wherein The chemically strengthened glass has a surface stress of 500 MPa or greater, preferably 600 MPa or greater, more preferably 650 MPa or greater; and / or a strengthening layer depth of 20 μm or greater, preferably 30 μm or greater, more preferably 40-65 μm; and / or a ring-to-ring test fracture strength of 1800 MPa or greater, preferably 2000 MPa or greater, more preferably 2100 MPa or greater; and / or a surface quality of Class 2 or greater, preferably Class 1; and / or a ring-to-ring test fracture strength improvement ratio of 1.5 or greater, preferably 1.8 or greater, more preferably 2.0 or greater.

14. Glass element, characterized in that The optical glass according to any one of claims 1 to 10, or the glass preform according to claim 11, or the chemically strengthened glass according to any one of claims 12 to 13.

15. An optical instrument, characterized in that A glass element comprising the optical glass according to any one of claims 1 to 10, or the chemically strengthened glass according to any one of claims 12 to 13, or the glass element according to claim 14.

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