High-thermal-stability cut-off glass, preparation method and application thereof

Abstract

This invention relates to the field of special glass materials, and provides a high thermal stability cutoff glass, its preparation method, and its application. The cutoff glass has a network structure in which elements exist in bound ionic form, and contains Si by a molar percentage. 4+ (62.1–67.6 mol%), Al 3+ (0.1–1.1 mol%), Zn 2+ (6.0–8.2 mol%), K ＋ (3.5–9.4 mol%), Ca 2+ (0.1–1.0 mol%), Mg 2+ (0.3-1.4 mol%), Na ＋ (7.3–15.7 mol%), B 3+ (6.4–12.8 mol%), Se 2‑ (0.7–1.5 mol%) and Cd 2+ (0.1-0.5 mol%). The stop glass of this invention has excellent comprehensive properties: bending strength > 110 MPa, maximum optical transmittance of 6 mm glass sample ≥ 91.0%, sag temperature Tf ≥ 670℃, and coefficient of thermal expansion α ≤ 70 × 10⁻⁶. ‑7 With a temperature range of / ℃, a cutoff wavelength of 625±15nm, and a steepness ≥1.0, this glass exhibits both Class I acid and moisture resistance. It can be used in optical windows and lenses for image mapping under complex lighting conditions, and is particularly suitable for optical components in electronic digital products, aerospace, or military environments.

Description

Technical Field

[0001] This application relates to special glass materials, specifically to a high thermal stability cutoff glass, its preparation method, and its application. Background Technology

[0002] Any discussion of prior art throughout the specification should not be construed as an admission that such prior art is well-known or constitutes part of common general knowledge in the art.

[0003] Cut-off glass is a type of glass material with special optical properties. It can achieve high transmittance or high reflectance within a specific wavelength range, thereby achieving the function of cut-off or filtering. This type of glass material has excellent characteristics such as pure color, high transmittance, and steep light absorption curve, and can increase transmittance from almost zero to its maximum value within an extremely narrow wavelength band.

[0004] Over the past two decades, the development of art glass and digital electronic products has been rapid, and cutoff glass has attracted widespread attention due to its pure color and excellent optical performance. Particularly in the field of digital electronic products, cutoff glass near the 630nm wavelength has a particularly wide range of applications, such as optical window glass for image mapping in complex lighting environments like mobile phone lenses, camera projectors, surveillance equipment lenses, aerospace, and military applications. In these applications, the 630nm wavelength lies in the transition region between visible red light and near-infrared light, and is a key wavelength point for common red lasers, red LEDs, and some fluorescent signals. By achieving precise cutoff in this band, interfering background light can be effectively filtered out, image contrast improved, and incident light from non-target wavelengths suppressed, thereby achieving high-precision optical recognition, ranging, or sensing functions. Therefore, cutoff performance near 630nm is currently one of the hot topics in the field of optical glass materials.

[0005] However, existing cutoff glass still has some problems that need to be solved in practical applications: (1) Insufficient thermal stability: In environments with large temperature changes, existing cutoff glass is prone to thermal expansion and contraction, resulting in dimensional instability and affecting optical performance. Especially under high temperature conditions, the glass material is prone to softening and deformation, and the sag temperature is generally low. (2) Limited mechanical strength: In mechanical stress environments such as vibration and impact, existing cutoff glass has insufficient bending resistance, which easily produces microcracks or even breakage, affecting service life and reliability. (3) Difficulty in controlling optical performance: Existing technology has difficulty in accurately controlling the cutoff wavelength and steepness, especially the cutoff characteristics near the 630nm band, which is more difficult to control, resulting in poor batch-to-batch consistency. (4) Insufficient chemical stability: In high humidity, acidic or alkaline environments, the glass surface is easily corroded, resulting in decreased transmittance and increased scattering, affecting the use effect of the optical window. (5) Poor processing performance: Existing cutoff glass is prone to defects such as deformation, bubbles, streaks, and crystallization during hot processing, which increases manufacturing costs and scrap rate. The low annealing point and softening point make it difficult to control the precision processing dimensions.

[0006] Especially in complex environments, more stringent requirements are placed on the thermal stability, mechanical strength, optical properties, and processing precision of glass materials. Existing stop-type glass has significant shortcomings in these key performance indicators, limiting its widespread use in high-end applications. Summary of the Invention

[0007] The main objective of this invention is to provide a high thermal stability cutoff glass, its preparation method, and its applications, thereby addressing the technical problem that existing cutoff glasses cannot meet the requirements of complex lighting environments. In this invention, a complex lighting environment refers to at least one of the following: an environment with large temperature fluctuations, an environment requiring precise spectral selection, an environment with mechanical stress, or an environment with chemical corrosion. Existing cutoff glasses exhibit numerous shortcomings when facing these complex environments: they are prone to deformation in environments with drastic temperature changes, have poor impact resistance under mechanical stress, are difficult to precisely control the cutoff characteristics near the 630nm wavelength, and lack stability in harsh chemical environments. These problems severely limit their application in high-end fields such as electronic digital products, aerospace, and military applications.

[0008] This invention achieves precise control of Si 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg 2+ Na ＋ B 3+ Se 2- and Cd 2+The composition and content of these ions, combined with optimized preparation processes, enable the glass material to possess at least one of a series of superior properties, including: mechanical properties with a flexural strength greater than 110 MPa, excellent optical properties with a maximum optical transmittance of greater than 91.0% for a 6 mm sample, a sag temperature Tf ≥ 670℃, and a coefficient of thermal expansion α ≤ 70 × 10⁻⁶ in the temperature range of 20℃ to 300℃. -7 The glass material exhibits excellent thermal stability at ℃, precise spectral control with a cutoff wavelength of 625±15 nm and a steepness ≥1.0, and Class I acid and moisture resistance. Ideally, the glass material of this invention can possess all of the above-mentioned superior properties simultaneously, but it is not required that these properties be met simultaneously in all applications.

[0009] This flexible and powerful combination of performance enables the cutoff glass of this invention to adapt to different types of complex lighting environments, leveraging its respective advantages according to specific application requirements. This not only fills the gaps in existing technologies but also provides a new solution for the development of optical materials in harsh application environments, particularly valuable in high-end applications requiring a balance of multiple performance requirements.

[0010] Specifically, the present invention provides the following technical solutions.

[0011] In a first aspect of the invention, a stop-type glass is provided, wherein the elements in the network structure of the glass exist in the form of bound ions, and the glass comprises or consists of the following in a mole percentage (mol%): Si 4+ 62.1-67.6 mol% Al 3+ 0.1-1.1 mol% Zn 2+ 6.0-8.2 mol%; K ＋ 3.5-9.4 mol%; Ca 2+ 0.1-1.0 mol% Mg 2+ 0.3-1.4 mol%; Na ＋ 7.3-15.7 mol%; B 3+ 6.4-12.8 mol% Se 2- 0.7-1.5 mol%; Cd 2+ 0.1-0.5 mol%.

[0012] In this invention, the content of all components is expressed as mole percentage (mol%), that is, each component is calculated in its ionic form and measured as a mole percentage, representing the relative molar quantity of each ion in the glass network structure. These ions include Si. 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg2+ Na ＋ B 3+ Se 2- and Cd 2+ Regardless of whether the raw materials are added in the form of oxides, carbonates, sulfides, or other compounds, the composition is converted to the final molar percentage of ions in the glass network when calculating the component content. The sum of the molar percentages of all ions listed in this invention is 100%.

[0013] The “bound ionic form” described in this invention refers to the existence of elements in a glass amorphous network structure as ions with specific valence states. These ions, according to their functions and coordination characteristics, form complex three-dimensional network structures with oxygen (or other non-metallic elements) through covalent bonds, ionic bonds, or mixed bonds, rather than existing as independent ions or molecules.

[0014] The high thermal stability cutoff glass of this invention achieves functional allocation and synergistic effects of various elements within the glass network through a specific component structure design. This structured design is based on a deep understanding of the mechanisms by which each element functions within the glass system, and achieves overall performance optimization through precise proportion control.

[0015] Si 4+ As the main network formant of the glass, Si accounts for 62.1-67.6 mol% in this invention and is responsible for constructing the basic network framework of the glass. As the main structural unit of the glass, Si... 4+ A silicon-oxygen tetrahedral network is formed, providing the basic framework of the glass and imparting good chemical stability and mechanical strength. In this invention, a reasonable Si... 4+ The Si content effectively reduces the coefficient of thermal expansion of the glass, significantly improving its heat resistance, chemical stability, and softening temperature, which is one of the key factors in achieving high thermal stability. 4+ When the content is below 62.1 mol%, the structural strength and chemical stability of the glass will be significantly reduced; while exceeding 67.6 mol% will lead to an excessively high melting point, increasing the difficulty of preparation and processing.

[0016] Therefore, in this invention, Si 4+ The content is 62.1-67.6 mol%. In some embodiments of the present invention, Si 4 +The content can be selected from the following ranges: 62.1-62.8 mol%, 62.1-63.1 mol%, 62.1-63.2 mol%, 62.1-64.0 mol%, 62.1-64.2 mol%, 62.1-64.4 mol%, 62.1-65.3 mol%, 62.1-67.6 mol%, 62.8-63.1 mol%, 62.8-63.2 mol%, 62.8-64.0 mol%, 62.8-64.2 mol%, 62.8-64.4 mol%, 62.8-65.3 mol%, 62.8-67.6 mol%, 63.1-63.2 mol%, 63.1-64.0 mol%, 63.1-64.2 mol%, 63.1-64.4 mol%, 63.1-65.3 mol%. mol%, 63.1-67.6 mol%, 63.2-64.0 mol%, 63.2-64.2 mol%, 63.2-64.4 mol%, 63.2-65.3 mol%, 63.2-67.6 mol%, 63.5-64.2 mol%, 64.0-64.2 mol%, 64.0-64.4 mol%, 64.0-65.3 mol%, 64.0-67.6 mol%, 64.2-64.4 mol%, 64.2-65.3 mol%, 64.2-67.6 mol%, 64.4-65.3 mol%, 64.4-67.6 mol%, 65.3-67.6 mol%. In some preferred embodiments, Si 4+ The content can be selected from the following ranges: 64.2-65.3 mol%, 64.2-64.4 mol%, 64.4-67.6 mol%, 64.2-67.6 mol%, 64.0-65.0 mol%, 63.0-65.0 mol%. In some exemplary embodiments, Si 4+ The content can be selected from any endpoint value of the above range or any value within the range, such as 64.2 mol%, 67.6 mol%, 64.4 mol%, 5.3 mol%, 63.1 mol%, 63.2 mol%, 62.1 mol%, 62.8 mol%, etc.

[0017] Al 3+ As an important network intermediate, Al plays multiple roles in glass networks at a content of 0.1-1.1 mol%. 3+ It is mainly used to improve the chemical stability of glass, effectively reduce the tendency of glass to crystallize, and at the same time improve the hardness, mechanical strength and tensile modulus of glass. 3+It can be incorporated into the glass network structure as a network formant or as a network modifier, thereby optimizing and adjusting the glass properties. An appropriate amount of Al... 3+ This reduces the coefficient of thermal expansion of the glass, significantly improving its thermal stability and softening temperature. However, a content exceeding 1.1 mol% leads to an increased melting point and excessively high viscosity of the molten glass, which is detrimental to melting and processing. Furthermore, in embodiments of the present invention, when Al... 3+ When the content is extremely low (e.g. below the limit of this invention or close to zero) or completely absent (e.g., without additional addition), the glass properties deteriorate, such as decreased chemical stability, significantly reduced acid and moisture resistance grades; significantly decreased sag temperature; increased coefficient of thermal expansion; and decreased flexural strength.

[0018] Therefore, in this invention, Al 3+ The content is 0.1-1.1 mol%. In some embodiments of the present invention, Al 3+ The content can be selected from the following ranges: 0.1-0.5 mol%, 0.1-0.6 mol%, 0.1-1.0 mol%, 0.1-1.1 mol%, 0.5-0.6 mol%, 0.5-1.0 mol%, 0.5-1.1 mol%, 0.6-1.0 mol%, 0.65-1.0 mol%, 0.6-1.1 mol%, 1.0-1.1 mol%. In some preferred embodiments, Al 3+ The content can be selected from the following ranges: 0.1-1.0 mol%, 0.6-1.0 mol%, 0.1-0.6 mol%, 0.9-1.1 mol%, 0.5-1.0 mol%. In some exemplary embodiments, Al 3+ The content can be selected from any endpoint value of the above range or any value within the range, such as 1 mol%, 0.1 mol%, 0.6 mol%, 0.5 mol%, 1.1 mol%, etc.

[0019] In this invention, Zn 2+ As a key component with special functions, Zn plays a crucial role in the high-temperature melting and cooling processes of glass. 2 + It can undergo reversible reactions with selenides and sulfides (e.g., ZnO + CdS) ZnS + CdO, ZnO + CdSe ZnSe + CdO significantly reduces the volatilization loss of colorants Se and Cd, ensuring precise control of the spectral absorption performance of the cut-off glass. When Zn... 2+Insufficient Zn content leads to easy volatilization of the colorant, resulting in unstable optical properties; while excessive content may affect the transparency and melting characteristics of the glass. Furthermore, in embodiments of the present invention, when Zn... 2+ When the content is extremely low (e.g. below the limit of this invention or close to zero) or completely absent (e.g., without additional addition), the optical properties of the glass often deteriorate. For example, the cutoff wavelength may lose stability and tend to shift significantly; the steepness value decreases significantly, and the cutoff characteristics tend to worsen; the transmittance and batch stability will be significantly affected.

[0020] Therefore, in this invention, Zn 2+ The content is 6.0-8.2 mol%. In some embodiments of the present invention, Zn 2+ The content can be selected from the following ranges: 6.0-6.1 mol%, 6.0-6.7 mol%, 6.0-6.8 mol%, 6.0-6.9 mol%, 6.0-7.7 mol%, 6.0-8.2 mol%, 6.1-6.7 mol%, 6.1-6.8 mol%, 6.1-6.9 mol%, 6.1-7.7 mol%, 6.1-8.2 mol%, 6.7-6.8 mol%, 6.7-6.9 mol%, 6.7-7.7 mol%, 6.7-8.2 mol%, 6.8-6.9 mol%, 6.8-7.7 mol%, 6.8-8.2 mol%, 6.9-7.5 mol%, 6.9-7.7 mol%, 6.9-8.2 mol%, 7.7-8.2 mol%. In some preferred embodiments, Zn 2+ The content can be selected from the following ranges: 6.7-6.9 mol%, 6.9-7.7 mol%, 6.7-7.7 mol%, 6.8-7.0 mol%, 6.8-7.0 mol%, 6.7-7.0 mol%. In some exemplary embodiments, Zn 2+ The content can be selected from any endpoint value of the above range or any value within the range, such as 6.9 mol%, 6.7 mol%, 7.7 mol%, 6.8 mol%, 6.1 mol%, 6.9 mol%, 6 mol%, 8.2 mol%, etc.

[0021] In this invention, K ＋ and Na ＋ As alkali metal ions, their contents are 3.5-9.4 mol% and 7.3-15.7 mol%, respectively, and they belong to the network modifiers in glass. These alkali metal ions are easy to move and diffuse in the glass, and their main function is to reduce the viscosity of glass during high-temperature melting, promote the melting and homogenization of glass, and act as good fluxes. In this invention, by precisely controlling K...＋ and Na ＋ The content and proportion of alkali metals can effectively balance the processing performance and thermal stability of glass, avoiding problems such as increased thermal expansion coefficient, decreased chemical stability, and decreased mechanical strength caused by excessive alkali metal content. In this invention, Na... ＋ and K ＋ A specific ratio can also achieve the "mixed alkali effect", further improving the overall performance of the glass.

[0022] Therefore, in this invention, K + The content is 3.5-9.4 mol%. In some embodiments of the present invention, K + The content can be selected from the following ranges: 3.5-3.6 mol%, 3.5-4.6 mol%, 3.5-5.9 mol%, 3.5-6.0 mol%, 3.5-6.6 mol%, 3.5-8.2 mol%, 3.5-9.0 mol%, 3.5-9.4 mol%, 3.6-4.6 mol%, 3.6-5.9 mol%, 3.6-6.0 mol%, 3.6-6.6 mol%, 3.6-8.2 mol%, 3.6-9.0 mol%, 3.6-9.4 mol%, 4.6-5.9 mol%, 4.6-6.0 mol%, 4.6-6.6 mol%, 4.6-8.2 mol%, 4.6-9.0 mol%, 4.6-9.4 mol%, 5.9-6.0 mol%, 5.9-6.6 mol%, 5.9-8.2 mol%. mol%, 5.9-9.0 mol%, 5.9-9.4 mol%, 6.0-6.6 mol%, 6.6-8 mol%, 6.0-8.2 mol%, 6.0-9.0 mol%, 6.0-9.4 mol%, 6.6-8.2 mol%, 6.6-9.0 mol%, 6.6-9.4 mol%, 8.2-9.0 mol%, 8.2-9.4 mol%, 9.0-9.4 mol%. In some preferred embodiments, K + The content can be selected from the following ranges: 6.0-6.6 mol%, 6.6-9.0 mol%, 3.6-6.6 mol%, 3.6-9.0 mol%, 6.5-6.8 mol%, and 6.0-7.0 mol%. In some exemplary embodiments, K + The content can be selected from any endpoint value of the above range or any value within the range, such as 6.6 mol%, 6 mol%, 3.6 mol%, 9 mol%, 9.4 mol%, 8.2 mol%, 5.9 mol%, 4.6 mol%, 3.5 mol%, etc.

[0023] In this invention, Na + The content is 7.3-15.7 mol%. In some embodiments, Na + The content can be selected from the following ranges: 9.8-15.7 mol%, 9.8-12.6 mol%, 9.8-10.8 mol%, 9.8-10.9 mol%, 9.8-10.0 mol%, 9.1-9.8 mol%, 9.1-15.7 mol%, 9.1-12.6 mol%, 9.1-10.8 mol%, 9.1-10.9 mol%, 9.1-10.0 mol%, 7.3-9.8 mol%, 7.3-9.1 mol%, 7.3-15.7 mol%, 7.3-12.6 mol%, 7.3-10.8 mol%, 7.3-10.9 mol%, 7.3-10.0 mol%, 12.6-15.7 mol%, 10.8-15.7 mol%, 10.8-12.6 mol%, 10.9-15.7 mol%. mol%, 10.9-12.6 mol%, 10.9-10.8 mol%, 10.0-15.7 mol%, 10.0-12.6 mol%, 10.0-10.8 mol%, 10.0-10.9 mol%. In some preferred embodiments, Na + The content can be selected from the following ranges: preferably, 7.3-9.1 mol%, 7.3-10.8 mol%, 9.1-10.8 mol%, 7.2-7.5 mol%, 7.3-9.1 mol%, 7.3-9 mol%, and 7.3-8.0 mol%. In some exemplary embodiments, Na... + The content can be selected from any endpoint value of the above range or any value within the range, such as 7.3 mol%, 9.1 mol%, 10.8 mol%, 10.9 mol%, 9.8 mol%, 12.6 mol%, 15.7 mol%, 10 mol%, etc.

[0024] Ca 2+ and Mg 2+ As alkaline earth metal ions, their contents in this invention are 0.1-1.0 mol% and 0.3-1.4 mol%, respectively, and the total amount in this invention does not exceed 2.4 mol%. The introduction of these two ions forms a delicate equilibrium system: Ca 2+ It increases the chemical stability and mechanical strength of glass, but easily causes glass crystallization; Mg 2+ This improves thermal stability and significantly reduces the coefficient of thermal expansion, but excessive amounts increase glass viscosity, leading to molding difficulties. In this invention, Mg... 2+ With Ca 2+The synergistic effect achieves mutual complementarity and defect compensation, Mg 2+ The addition effectively reduced Ca 2+ The resulting increase in the coefficient of thermal expansion, along with the combined effect of these factors, enhances the mechanical strength and chemical durability of the glass, forming a unique synergistic performance enhancement mechanism. In embodiments of this invention, when other alkaline earth metal ions (such as Ba) are used... 2+ ) Replace Ca 2+ Even when maintaining similar molar contents, glass properties often change: the coefficient of thermal expansion typically tends to increase; the sag temperature may decrease; the cutoff wavelength often shifts; the steepness may decrease; and the flexural strength typically tends to decline. These trends indicate that the elemental composition in this invention is quite specific, and element substitution can lead to multifaceted changes in properties.

[0025] In this invention, Ca 2+ The content is 0.1-1.0 mol%. In some embodiments, Ca 2+ The content can be selected from the following ranges: 0.1-0.2 mol%, 0.1-0.3 mol%, 0.1-0.5 mol%, 0.1-1.0 mol%, 0.2-0.3 mol%, 0.2-0.5 mol%, 0.2-1.0 mol%, 0.3-0.5 mol%, 0.3-1.0 mol%, 0.35-0.5 mol%, 0.4-0.5 mol%, 0.5-1.0 mol%. In some preferred embodiments, Ca 2+ The content can be selected from the following ranges: 0.5 mol%, 0.4-0.6 mol%, 0.3-0.7 mol%, 0.1-0.5 mol%. In some exemplary embodiments, Ca 2+ The content can be selected from any endpoint value of the above range or any value within the range, such as 0.5 mol%, 0.1 mol%, 0.3 mol%, 1 mol%, 0.2 mol%, etc.

[0026] In this invention, Mg 2+ The content is 0.3-1.4 mol%. In some embodiments, Mg 2+ The content can be selected from the following ranges: 0.3-0.4 mol%, 0.3-0.7 mol%, 0.3-1.4 mol%, 0.4-0.7 mol%, 0.4-1.4 mol%, 0.7-1.4 mol%, 0.5-0.7 mol%, 0.7-1.3 mol%, 0.7-1.0 mol%. In some preferred embodiments, Mg 2+The content can be selected from the following ranges: 0.7 mol%, 0.6-0.8 mol%, 0.5-0.9 mol%, 0.4-0.7 mol%. In some exemplary embodiments, Mg 2+ The content can be selected from any endpoint value of the above range or any value within the range, such as 0.7 mol%, 0.4 mol%, 0.3 mol%, 1.4 mol%, etc.

[0027] B 3+ In this invention, the content is 6.4-12.8 mol%, exhibiting a unique dual-structure characteristic. B 3+ It can form [BO4] tetrahedra to enter the glass network, increasing the bridging oxygen content, and it can also form [BO3] triangular bodies to achieve a chain-breaking effect. This structural duality makes B 3+ The ability to flexibly adjust the connectivity of the glass network has a positive effect on reducing high-temperature viscosity, improving melt quality, and enhancing chemical stability. (In the presence of Se...) 2- and Cd 2+ In glass containing semiconductor materials, B 3+ The ratio of alkali metal ions to the colored microcrystals also directly affects the formation of the colored microcrystals, and requires precise control to achieve balance.

[0028] B 3+ In this invention, the content is 6.4-12.8 mol%, exhibiting a unique dual-structure characteristic. B 3+ It can form [BO4] tetrahedra to enter the glass network, increasing the bridging oxygen content, and it can also form [BO3] triangular bodies to achieve a chain-breaking effect. This structural duality makes B 3+ The ability to flexibly adjust the connectivity of the glass network has a positive effect on reducing high-temperature viscosity, improving melt quality, and enhancing chemical stability. In this invention, B 3+ The content is 6.4-12.8 mol%. In some embodiments, B 3+The content can be selected from the following ranges: 9.6-12.8 mol%, 9.6-11.2 mol%, 9.6-10.5 mol%, 8.1-9.6 mol%, 8.1-12.8 mol%, 8.1-11.2 mol%, 8.1-10.5 mol%, 8.0-9.6 mol%, 8.0-8.1 mol%, 8.0-12.8 mol%, 8.0-11.2 mol%, 8.0-10.5 mol%, 6.4-9.6 mol%, 6.4-8.1 mol%, 6.4-8.0 mol%, 6.4-12.8 mol%, 6.4-11.2 mol%, 6.4-10.5 mol%, 11.2-12.8 mol%, 10.5-12.8 mol%, 10.5-11.2 mol%, 10.6-11.2 mol%. mol%, 11.2-12.5 mol%, 11.2-12.0 mol%. In some preferred embodiments, B 3+ The content can be selected from the following ranges: preferably, 8.1-11.2 mol%, 10.5-11.2 mol%, 8.1-10.5 mol%, 8.1-11.2 mol%, 11.0-11.5 mol%, and 8.0-11.2 mol%. In some exemplary embodiments, B 3+ The content can be selected from any endpoint value of the above range or any value within the range, such as 11.2 mol%, 8.1 mol%, 10.5 mol%, 8.1 mol%, 8 mol%, 9.6 mol%, 6.4 mol%, 12.8 mol%, etc.

[0029] Se 2- and Cd 2+ These two elements are present in the present invention at contents of 0.7-1.5 mol% and 0.1-0.5 mol%, respectively. These two elements are important components for achieving specific optical properties in the cutoff glass of the present invention. In the present invention, Se is precisely controlled... 2- and Cd 2+ The content of [specific element] achieved a cutoff wavelength control of 625±15nm and a steepness greater than 1.0, meeting the precise requirements for spectral screening under complex lighting conditions. Furthermore, in embodiments of the present invention, when Se [specific element]... 2- and Cd 2+Simultaneously, when Se is absent (e.g., not added) or significantly reduced (e.g., below the limits of this invention or close to zero), the cutoff characteristics of the glass will be greatly weakened. For example, the transmittance curve tends to be continuous transmission type, and the cutoff wavelength and steepness characteristics may be significantly deteriorated; the hue usually tends from pale yellow to colorless; the spectral selectivity is significantly reduced, the effect of infrared blocking is greatly weakened, and the visible light / near-infrared separation capability tends to decline. In this invention, Se 2- The content is 0.7-1.5 mol%. In some embodiments, Se 2- The content can be selected from the following ranges: 0.7-0.8 mol%, 0.7-1.0 mol%, 0.7-1.2 mol%, 0.7-1.5 mol%, 0.8-1.0 mol%, 0.8-1.2 mol%, 0.8-1.5 mol%, 1.0-1.2 mol%, 1.0-1.5 mol%, 1.0-1.5 mol%, 1.2-1.5 mol%. In some preferred embodiments, Se 2- The content can be selected from the following ranges: 1.0-1.5 mol%, 1.0-1.4 mol%, 1.0-1.3 mol%, 1.0-1.2 mol%, 1.0-1.1 mol%, 0.9-1.2 mol%, 1.2-1.5 mol%, 0.9-1.5 mol%, 1.1-1.3 mol%, 0.9-1.2 mol%, 1.2-1.45 mol%, 1.1-1.2 mol%. In some exemplary embodiments, Se 2- The content can be selected from any endpoint value of the above range or any value within the range, such as 1.2 mol%, 1 mol%, 1.5 mol%, 0.8 mol%, 0.7 mol%, etc. In this invention, Cd 2+ The content is 0.1-0.5 mol%. In some embodiments, Cd 2+ The content can be selected from the following ranges: 0.1-0.2 mol%, 0.1-0.3 mol%, 0.1-0.4 mol%, 0.1-0.5 mol%, 0.2-0.3 mol%, 0.2-0.4 mol%, 0.2-0.5 mol%, 0.3-0.4 mol%, 0.3-0.5 mol%, 0.4-0.5 mol%, 0.31-0.4 mol%, 0.4-0.49 mol%. In some preferred embodiments, Cd 2+The content can be selected from the following ranges: 0.2-0.5 mol%, 0.2-0.4 mol%, 0.1-0.4 mol%, 0.3-0.4 mol%, 0.4-0.5 mol%, 0.1-0.5 mol%, 0.3-0.5 mol%, 0.31-0.5 mol%, 0.2-0.4 mol%. In some exemplary embodiments, Cd 2+ The content can be selected from any endpoint value of the above range or any value within the range, such as 0.4 mol%, 0.2 mol%, 0.5 mol%, 0.1 mol%, 0.3 mol%, etc.

[0030] In a preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, comprising, by molar percentage: Si 4+ 64.0-67.6 mol% Al 3+ 0.5-1.0 mol% Zn 2+ 6.5-7.7 mol%; K ＋ 5.5-9.4 mol%; Ca 2+ 0.3-0.7 mol%; Mg 2+ 0.5-0.8 mol% Na ＋ 7.3-11.0 mol%; B 3+ 8.0-11.5 mol%; Se 2- 0.8-1.2 mol%; Cd 2+ 0.2-0.4 mol%.

[0031] In another preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, comprising or consisting of the following by molar percentage: Si 4+ 63-67.6 mol% Al 3+ 0.1-1 mol% Zn 2+ 6.1-7.7 mol%; K ＋ 3.6-9.4 mol%; Ca 2+ 0.3-1.0 mol% Mg 2+ 0.5-1.4 mol%; Na ＋ 7.3-12.6 mol%; B 3+ 8-11.2 mol%; Se 2- 1-1.5 mol%; Cd 2+ 0.2-0.5 mol%.

[0032] In a more preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, comprising or consisting of the following by molar percentage: Si 4+ 63.1-67.6 mol% Al 3+ 0.1-1.0 mol% Zn 2+ 6.7-7.0 mol%; K ＋ 6.0-9.4 mol%; Ca 2+ 0.1-0.6 mol%; Mg 2+ 0.4-0.8 mol% Na ＋ 7.3-10.9 mol%; B 3+ 8.0-11.5 mol%; Se 2- 0.7-1.2 mol%; Cd 2+ 0.1-0.4 mol%.

[0033] In a more preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, comprising or consisting of the following in a molar percentage: Si 4+ 64.2-67.6 mol% Al 3+ 0.6-1 mol% Zn 2+ 6.7-7.7 mol%; K ＋ 3.6-9 mol% Ca 2+ 0.3-0.9 mol%; Mg 2+ 0.5-0.7 mol% Na ＋ 7.3-10.9 mol%; B 3+ 8.1-11.2 mol%; Se 2- 1-1.2 mol%; Cd 2+ 0.2-0.4 mol%.

[0034] In a more preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, comprising or consisting of the following in a molar percentage: Si 4+ 64.0-64.5 mol% Al 3+ 0.9-1.0 mol% Zn 2+ 6.8-7.0 mol%; K ＋ 6.5-6.8 mol%; Ca 2+ 0.4-0.6 mol%; Mg 2+ 0.6-0.8 mol% Na ＋ 7.2-7.5 mol%; B 3+ 11.0-11.5 mol%; Se2- 1.1-1.2 mol%; Cd 2+ 0.3-0.5 mol%.

[0035] In a more preferred embodiment, the elements in the network structure of the high thermal stability cutoff glass exist in the form of bound ions, and the element comprises or is composed of the following (by molar percentage): Si 4+ 64.0-65.5 mol% Al 3+ 0.5-1.0 mol% Zn 2+ 6.7-7.0 mol%; K ＋ 6.0-8.0 mol%; Ca 2+ 0.3-0.6 mol%; Mg 2+ 0.6-0.8 mol% Na ＋ 7.3-9.1 mol%; B 3+ 10.0-11.5 mol%; Se 2- 1.0-1.2 mol%; Cd 2+ 0.3-0.4 mol%.

[0036] The specific technical features described in the foregoing embodiments of this invention include each element Si. 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg 2+ Na ＋ B 3+ Se 2- and Cd 2+ The content ranges of the elements, provided there are no technical inconsistencies, can be combined in various appropriate ways to form other embodiments of the present invention. This means that each element can be selected with any value within its respective content range and combined with any appropriate content value of other elements to form a new effective formulation. To avoid unnecessary redundancy, the present invention will not describe each of these possible element content combinations in detail.

[0037] It should be specifically noted that all numerical ranges mentioned in this invention should be understood to include all values ​​within that range, as well as sub-ranges formed by any two values ​​within that range. For example, when expressed as "0.2-1", the range not only includes values ​​such as 0.2, 0.3, 0.4...1.0, but also includes a sub-range (i.e., 0.21-0.9) formed by any two values ​​(such as 0.21 and 0.9). Furthermore, different values ​​or ranges involving the same technical indicator in various embodiments of this invention can be cross-combined to form new effective range values, and these combinations also fall within the protection scope of this invention.

[0038] In addition to the individual effects of each component, the high thermal stability cutoff glass system provided by this invention achieves synergistic optimization of the material's thermal stability, mechanical strength, optical properties, and chemical stability by optimizing and controlling the proportions between several components. The typical component proportions and their roles in the system of this invention will be explained below.

[0039] In some implementations, Mg 2+ Ca 2+ With Al 3+ All three play a role in regulating the glass structure. Formulation analysis and performance evaluation revealed that when Mg... 2+ / Ca 2+ When the molar ratio is controlled between 1.0 and 4.0, preferably between 1.4 and 4.0, the resulting glass typically exhibits a relatively balanced performance in terms of thermal expansion coefficient and flexural strength. For example, in Example 5, this ratio was approximately 1.4, and the corresponding glass sample exhibited superior thermal stability and mechanical strength. In embodiments of the present invention, when the Mg... 2+ and Ca 2+ When specifying the content ratio, for example, Mg within the above range... 2+ / Ca 2+ When the proportion decreases significantly (e.g., the molar ratio is below 1.0), the coefficient of thermal expansion of the glass tends to increase; the sag temperature usually decreases; the cutoff wavelength may shift; and the steepness value tends to decrease. These trends indicate that Mg... 2+ / Ca 2+ The ratio has a significant impact on the thermal and optical properties of glass, and proper control of the ratio helps to obtain better overall performance.

[0040] Furthermore, in the system, Al 3+ / (Mg 2+ +Ca 2+ When the proportion of Al is 0.08–2.2, preferably 0.08–1.0, and more preferably 0.08–0.85, a relatively stable glass network structure can be obtained. When the total amount of the above three elements is controlled at 1.0–3.5 mol%, preferably 1.0–2.2 mol%, and more preferably 1.3–2.2 mol%, it is generally beneficial to improve the overall mechanical and thermal properties while ensuring melt processability. In the embodiments of the present invention, when Al... 3+ / (Mg 2+ +Ca 2+When the proportion of Al is reduced to a low level (e.g., below the limit of this invention), the thermal stability of the glass tends to decrease, and the sag temperature usually decreases; the coefficient of thermal expansion may increase; the mechanical strength tends to decrease; the chemical stability tends to decrease; the resistance to crystallization may weaken, and crystalline phases are more likely to appear after prolonged high-temperature holding. These trends indicate that Al 3+ The synergistic ratio between alkaline earth metal ions and glass has a significant impact on the overall performance of glass, and reasonable control of this ratio helps to achieve a better performance balance.

[0041] In terms of optical performance construction, Se 2- Cd 2+ With Zn 2+ The ratio between them also constitutes one of the control factors in the design of this invention. Implementation results show that when Se... 2- / Cd 2+ When the molar ratio is controlled within the range of 2.0–8.0, preferably 3.0–5.0, different hue coloring effects can be obtained, and good cutoff characteristics in the 625±15 nm band can be achieved. In a typical embodiment, such as Example 5, when Se 2- / Cd 2+ At approximately 3.0, the glass exhibits better optical filtering performance.

[0042] In addition, Zn 2+ / Se 2- The molar ratio is controlled between 4.6 and 10.25, preferably 5.75 to 6.7, or Zn 2+ / (Se 2- +Cd 2 + The S-value is controlled between 3.45 and 8.6, preferably between 4.3 and 5.6, which can help suppress Se in the glass system provided by the present invention. 2- The high-temperature volatilization improves the uniformity and stability of the colorant. The total content of the above three components is controlled at 6.8–9.3 mol%, preferably 7.9–8.9 mol%, further enhancing the controllability of the cutoff wavelength and the steepness of the transmittance curve. In an embodiment of the present invention, when Zn 2+ / (Se 2- +Cd 2+ When the Zn content decreases to a lower level (e.g., below the limit of 3.45 in this invention), the transmittance of the glass tends to change; the cutoff wavelength usually shifts, potentially deviating from the target wavelength region; batch-to-batch stability tends to decrease; and color changes during heat treatment may become more sensitive. These trends indicate that Zn 2+ with Se 2- Cd 2+ The synergistic ratio between these components has a significant impact on product performance, and properly controlling this ratio helps to obtain more stable optical performance.

[0043] In terms of glass network framework construction, Si 4+ With B 3+ The ratio between these components can be used to control the viscosity, structural stability, and thermal expansion behavior of the glass. In some embodiments, Si... 4+ / B 3+ The molar ratio is 4.9–9.9, preferably 5.6–8.4; from B 3+ / Si 4+ When measured by angle, it is more appropriate to control the ratio within the range of 0.1–0.21. When the total content of both is controlled at 69.6–75.7 mol%, preferably 74.9–75.7 mol%, and more preferably 75.5–75.7 mol%, it helps to achieve good skeletal continuity and structural density.

[0044] Na ＋ With K ＋ As a network modifying element, its proportion is mainly used in this invention to adjust the melt processing properties and chemical stability of the glass. Comparison through examples shows that when Na... ＋ / K ＋ When the molar ratio is between 0.81 and 3.42, preferably between 1.1 and 1.52, the prepared glass samples exhibit good forming fluidity and resistance to damp heat; Na ＋ +K ＋ When the total content is controlled at 13.5–20.3 mol%, preferably 13.9–16.3 mol%, it also contributes to the overall balance of performance. In embodiments of the present invention, when Na… ＋ / K ＋ When the proportion deviates significantly from the optimal range (e.g., from the limits of this invention), for example, Na... ＋ / K ＋ Excessive sodium hydroxide concentration disrupts the balance of the mixed alkali effect, often reducing the glass's acid and moisture resistance; the coefficient of thermal expansion typically tends to increase; the sag temperature may decrease; and the flexural strength often declines. These trends indicate that sodium hydroxide... ＋ and K ＋ The appropriate ratio of alkali has a significant impact on glass properties, and making reasonable use of the mixed alkali effect can help achieve better overall performance.

[0045] In the regulation of more complex network structures, (Si) 4+ +Al 3+ +B 3+ The total amount is controlled at 70.7–76.8 mol%, preferably 75.5–76.5 mol%; (Si) 4+ +Al 3+ +B 3+ ) / (Na ＋+K ＋ The value should be controlled between 3.55 and 5.70, preferably between 5.01 and 5.51, which is beneficial to the structural synergy between the network forming body and the modifying body.

[0046] In designs that balance structural control and spectral functionality, (Al) 3+ +Mg 2+ +Ca 2+ ) / (Se 2- +Cd 2+ The molar ratio of Zn is controlled between 0.90 and 2.34, preferably between 1.08 and 1.375. 2+ / (Al 3+ +Mg 2+ +Ca 2+ When the value is 1.9–6.8, preferably 3.1–5.2, it generally helps to match the functional elements and coordinate the overall performance.

[0047] The aforementioned proportions and their control methods are all optimized within the multi-component system architecture design of this invention, reflecting the synergistic matching between the components. The relevant parameters are not isolated control measures, but rather constitute part of the overall performance building strategy of this invention, and can be flexibly combined and adjusted according to actual performance requirements.

[0048] This multi-element, multi-level overall balanced design is the key to the invention's ability to achieve synergistic optimization of high thermal stability, excellent optical performance, and good mechanical properties, enabling it to meet the stringent application requirements under complex lighting environments.

[0049] This invention utilizes Si 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg 2+ Na ＋ B 3+ Se 2- and Cd 2+ By optimizing and controlling the content and proportions of the components, the prepared high thermal stability cutoff glass achieves synergistic improvement in several key performance indicators, specifically:

[0050] In terms of optical performance: the glass of the present invention has a maximum transmittance of over 91% at a thickness of 6 mm, and in the preferred embodiment it can reach 92% or more; the cutoff wavelength is in the range of 625±15 nm; the steepness index is not less than 1.0, and in the preferred embodiment it can reach 1.5 or more, and in some embodiments it can reach 1.6 or more, exhibiting excellent narrowband cutoff capability and color purity.

[0051] Regarding thermal stability: the sag temperature of the glass of this invention is not lower than 660°C, preferably 670°C or higher, and in some embodiments it can reach 683°C, exhibiting excellent adaptability to hot working; the coefficient of thermal expansion is controlled at 70×10⁻⁶. -7 / ℃ and below, preferably 68×10 -7 / ℃ and below helps maintain dimensional stability in environments with drastic temperature differences.

[0052] In terms of mechanical properties: the glass generally has a bending strength of 110 MPa or more, preferably 125 MPa or more, and in a more preferred embodiment it can reach 135 MPa, which is significantly better than similar products in the prior art and is suitable for optical structural components in high-load or impact-prone environments.

[0053] In terms of chemical stability: the glass of the present invention exhibits a Class I acid and moisture resistance rating in both acidic and humid environments, ensuring its service life and optical cleanliness under complex environmental conditions.

[0054] The synergistic achievement of the aforementioned performance indicators is accomplished through the coordinated control of the proportions of various glass-forming materials, network modifiers, and optical functional elements. For example, controlling the proportions of Mg... 2+ -Ca 2+ -Al 3+ The appropriate ratio helps to enhance structural strength and thermal stability; controlling the Zn content... 2+ -Se 2- -Cd 2+ The appropriate ratio helps to achieve precise control over the wavelength cutoff position and steepness; while Si 4+ -B 3+ Na ＋ -K ＋ The combination of these technologies enhances network stability and processing performance. The resulting high-performance glass system can be widely used in optical windows, image acquisition, monitoring equipment, and high-end lenses under complex lighting conditions.

[0055] In a second aspect of the invention, a method for preparing the stop-type glass described in the first aspect is provided. This method can be used to prepare the stop-type glass described in any of the foregoing aspects. By rationally selecting the types and proportions of raw materials and the parameters of melting, refining, and forming processes, this method ensures that the glass product maintains good coloring properties while achieving synergistic control of thermal stability, mechanical strength, and chemical stability.

[0056] The method includes the following steps:

[0057] Raw material mixing: Take materials containing Si 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg2+ Na ＋ B 3+ Se 2- and Cd 2+ The raw materials are mixed uniformly according to a preset molar percentage range. For example, in one embodiment, the raw materials corresponding to each element may be: quartz sand, aluminum hydroxide, zinc oxide, potassium carbonate, calcium carbonate, basic magnesium carbonate, sodium carbonate, boric acid, selenium powder, and cadmium sulfide. This avoids the introduction of nitrates, which would result in an oxidizing melting atmosphere.

[0058] Melting and Stirring: The mixed raw materials are melted at a temperature range of 1500~1600℃ in a neutral or weakly reducing atmosphere for 8~16 hours to ensure that all components react fully and form a homogeneous melt. Mechanical or electromagnetic stirring can be used during melting, with a preferred stirring speed of 10~30 r / min and a stirring time of 3~12 hours to suppress crystallization, bubbles, and component segregation. Clarification Treatment: After melting, the mixture is held at a high temperature for a period of time to complete the clarification process, removing residual bubbles and impurities from the melt to obtain good optical homogeneity. Clarification conditions can be optimized according to the specific melting system.

[0059] Forming: The clarified molten glass is formed at 1400~1450℃, with a preferred forming time of 5~25 minutes. Conventional processes such as molding, casting, or continuous rolling can be used. The cooling rate must be controlled to avoid thermal stress or structural distortion.

[0060] Optionally, after the glass is formed, it can be further heat-treated to achieve annealing and secondary color development, release residual stress inside the glass, and control the cutoff wavelength of the glass, thereby improving the mechanical stability, dimensional accuracy, and cutoff wavelength accuracy of the finished product. The heat treatment temperature is 640~670℃, the holding time is 6~10h, and after the holding time is completed, the power is turned off and the temperature is slowly reduced.

[0061] In this invention, by controlling the melting temperature within the range of 1500~1600℃, the components are ensured to fully melt and react, which is particularly beneficial for high Si content components. 4+ The dissolution and network structure formation of the glass melt are crucial. Melting time is controlled between 8 and 16 hours to ensure thorough homogenization of the molten glass, guaranteeing uniform distribution of components and preventing component segregation and streak defects. The melting atmosphere should be neutral or weakly reducing to avoid the formation of Se. 4+ This results in the glass not being colored.

[0062] Mechanical stirring is an optional stirring method in the preparation method of this invention. For example, by controlling the stirring speed at 10~30 r / min and the stirring time at 3~12 h, the homogenization of the glass melt and the elimination of bubbles can be effectively promoted. Appropriate stirring speed and time can significantly improve the optical uniformity of the glass, reduce defects such as streaks and bubbles, and at the same time avoid introducing new bubbles or impurities due to excessive stirring.

[0063] The molding temperature is controlled at 1400~1450℃, and the molding time is 5~25min. The selection of these process parameters is based on a systematic study of the glass composition characteristics and rheological properties of this invention. Appropriate molding temperature and time ensure that the glass has a suitable viscosity, which facilitates precise molding, while avoiding the loss of volatile components due to excessively high temperature or the difficulty in molding and increased internal stress due to excessively low temperature.

[0064] By optimizing the above process parameters, the preparation method of the present invention achieves high-quality and controllable preparation of high thermal stability cutoff glass, providing high-quality glass blanks for subsequent processing steps such as cutting, grinding and polishing, and ensuring that the final product has excellent optical performance and physical stability.

[0065] In this invention, by precisely controlling key process parameters such as melting temperature, melting time, stirring parameters, clarification and forming conditions, combined with the aforementioned first aspect regarding Si... 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg 2+ Na ＋ B 3+ Se 2- and Cd 2+ The systematic optimization of the component ratios enables the fabricated glass material to maintain good formability while achieving stable high transmittance, precisely controllable cutoff wavelength, high thermal stability, excellent mechanical strength, and Class I chemical durability. This fabrication process is characterized by its mature workflow, wide parameter window, and good batch-to-batch consistency. It is widely applicable to the mass production needs of optical components under complex lighting conditions, and is particularly suitable for applications requiring high spectral cutoff accuracy and structural stability, such as lens windows, filters, and projection imaging systems.

[0066] The process parameter range provided in this invention has good adaptability and can be compatible with common equipment and condition differences in industrial production. For example, different sizes of melting furnaces, different types of stirring devices, or different forming processes may require fine-tuning of specific parameters, but as long as they are controlled within the range described in this invention, high thermal stability cutoff glass that meets performance requirements can usually be obtained.

[0067] A third aspect of the present invention provides the application of the cut-off glass described in any of the foregoing aspects in optical elements, particularly in image acquisition or precision measurement scenarios under complex lighting conditions.

[0068] The complex lighting environment includes, but is not limited to, the following situations: situations with significant temperature fluctuations (such as outdoor monitoring and vehicle imaging); situations requiring precise selection of specific spectral bands (such as camera red light correction and night vision filtering); assembly structures subjected to mechanical stress or impact loads (such as aerial lenses and military observation windows); and situations where the equipment is used for a long time in acidic, humid, or corrosive environments (such as field terminals and equipment in humid and hot areas).

[0069] The high thermal stability cutoff glass provided by this invention has narrow band spectral cutoff (e.g., 625±15nm), high transmittance (≥91%), excellent bending strength (>110 MPa), good thermal stability (sag temperature ≥670℃) and Class I chemical stability. It is suitable for manufacturing various high-performance optical components, such as optical windows, filters, imaging lenses, window glass in camera and projection systems, red light cutoff filter components, etc.

[0070] For example, in a typical implementation, the cutoff glass is used to manufacture red light cutoff filters near the 630 nm wavelength band, effectively suppressing red light interference in image sensing systems while possessing good durability and processing compatibility. This type of product is particularly suitable for consumer electronics, surveillance equipment, aerospace, military surveying and mapping, and high-end optical instruments.

[0071] In a fourth aspect of the invention, an optical element is provided, comprising the cut-off glass described in the first aspect above;

[0072] The optical element can be a standalone structure or a component of a larger optical system (such as an imaging module, window assembly, or sensing module). In some embodiments, the optical element specifically includes, but is not limited to, the following forms: filters or optical lenses, such as cut-off filters, optical lenses in camera lenses, projector lenses or module windows, external window glass of monitoring equipment, and optical cover plates for image acquisition and spectral modulation.

[0073] For example, in one embodiment, the optical element is a red light cutoff filter for an image system, or a window sheet installed in front of an image sensing component. It is made of the glass material of the present invention and can effectively block interference light near the 630nm band, improve image clarity and color purity, and has excellent thermal stability and mechanical strength, maintaining stable performance when subjected to harsh environments such as high temperature, impact or humid heat.

[0074] These optical components can be widely used in technological fields that have high requirements for spectral control and environmental adaptability, such as consumer electronics, optical instruments, precision projection, aerospace and military surveying.

[0075] Compared to existing technologies, the advantages of this invention include:

[0076] Compared with existing technologies, the high thermal stability cutoff glass provided by this invention has achieved systematic improvements and technological breakthroughs in many aspects, such as component system construction, optical performance control, thermomechanical stability enhancement, and process adaptability, demonstrating significant comprehensive performance advantages.

[0077] This invention constructs a Si 4+ Al 3+ Zn 2+ K ＋ Ca 2+ Mg 2+ Na ＋ B 3+ Se 2- and Cd 2+ The core is a multi-component synergistic system, and targeted control strategies are introduced between the component ratios to achieve a good balance in terms of structural compactness, color stability, and spectral cutoff characteristics in the resulting glass material. Compared with the single-component-dominated design approach commonly used in existing cutoff glasses, the overall formulation design of this invention overcomes the problems of performance imbalance and parameter incompatibility, endowing the material with the ability to simultaneously optimize optical, mechanical, and chemical properties, thus meeting the high requirements for comprehensive material performance in complex application environments.

[0078] In terms of optical performance, the cutoff glass provided by this invention can achieve stable cutoff control in the 625±15 nm band, and under the preferred formulation conditions, it can obtain spectral filtering characteristics with a transmittance of not less than 91% and a steepness of not less than 1.0. Some embodiments can achieve a high steepness value of 1.6, which effectively solves the shortcomings of existing red light cutoff glass in terms of cutoff accuracy, filtering edge stability and tone consistency. It is especially suitable for image system scenarios with high requirements for imaging clarity and color reproduction.

[0079] In terms of thermodynamic and mechanical properties, this invention introduces Mg 2+ Ca 2+ With Al 3+ The synergistic control structure improves the bending resistance and thermal stability of the glass, enabling it to have a sag temperature of not less than 670°C and a coefficient of thermal expansion controlled at 70×10⁻⁶. -7Below a certain temperature, the flexural strength is not less than 110 MPa, and in the preferred embodiment, the flexural strength can reach 135 MPa. These properties ensure that the glass maintains good dimensional stability and physical integrity even in outdoor high-temperature, drastic temperature change, or complex structural stress applications.

[0080] Meanwhile, the material system of this invention avoids the use of highly toxic components such as TeO2 and As2O3, possesses good environmental protection properties, and has excellent melt processability, high clarification efficiency, and good bubble control effect. It is suitable for conventional industrial glass forming processes, such as calendering, molding, rolling, and float glass, which facilitates the stable mass production of large-size glass products and has significant engineering implementation value.

[0081] In summary, this invention not only overcomes the technical bottleneck of existing cutoff glass in balancing optical cutoff characteristics, thermomechanical properties, chemical stability, and environmentally friendly processes, but also provides a solid material foundation and preparation guarantee for the expanded application of high-end optical glass materials in aerospace, consumer electronics, surveillance imaging, precision surveying and mapping, and other fields. Attached Figure Description

[0082] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein:

[0083] Figure 1 This is a comparison curve of the transmittance of 6 mm thick glass products in the wavelength range of 200-1000 nm between Comparative Example 2 and Example 5. Detailed Implementation

[0084] This application is further illustrated with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope thereof. Experimental methods not specifically described in the embodiments are generally performed under conventional conditions or conditions recommended by the manufacturer.

[0085] Unless otherwise defined, all technical and scientific terms used in this application shall have meanings familiar to those skilled in the art. Unless otherwise specified, all reagents or raw materials used in this application are obtainable through conventional means and used in accordance with conventional methods or product instructions in the art. Furthermore, any methods or materials similar to or equivalent to those described may be applied to the methods of this application. The preferred embodiments and materials described in this application are for illustrative purposes only.

[0086] The performance parameters in the following embodiments were obtained by measuring them using the following method:

[0087] The coefficient of thermal expansion α and sag temperature Tf of the glass samples were measured using a DIL 402 thermal expansion coefficient measuring instrument manufactured by Netzsch AG, Germany. Sample preparation involved grinding the glass sample into a cylindrical strip with a diameter of 6 × 50 mm, ensuring both ends were parallel. The heating rate was set to 5 °C / min, and the data acquisition period was 20 ms. (GB / T 7962.16-2010)

[0088] Transmittance was measured using a UV-Vis-IR spectrophotometer to obtain a transmittance curve and determine the maximum optical transmittance. The cutoff wavelength and steepness were then obtained or calculated based on the transmittance curve. The cutoff wavelength is the spectral transmittance τ(λ) measured automatically or manually at a specific thickness (6 mm in this invention). τ(λ) represents the spectral transmittance at wavelength λ, and τ(700nm) represents the transmittance measured at 700nm. Based on the measured high transmittance τ(700nm), τ(λj) is calculated. τ(λj) represents the transmittance at the cutoff wavelength and is defined as 50% of τ(700nm), i.e., τ(λj) = 0.5τ(700nm). Then, the cutoff wavelength λj is measured back from the value of τ(λj), which is the wavelength corresponding to when the transmittance drops to half of τ(700nm). The spectral transmittance τ(λj-20nm) is measured, and the steepness K (representing the steepness of the spectral curve in the cutoff region; a larger K value indicates better cutoff characteristics) is calculated using the following formula: K = D(λj-20nm) - D(λj); where D(λj-20nm) = -lgτ(λj-20nm); D(λj) = -lgτ(λj). In the above formula, λj-20nm represents the wavelength point 20nm shorter than the cutoff wavelength; τ(λj-20nm) represents the transmittance 20nm before the cutoff wavelength; D(λj-20nm) represents the optical density 20nm before the cutoff wavelength; and D(λj) represents the optical density at the cutoff wavelength.

[0089] After polished glass samples were eroded by test media with acidities of pH 2.9, pH 4.6, and pH 6.0, the time it took for the glass surface to exhibit violet-blue interference colors, surface discoloration, or peeling under incandescent light was observed. Based on the duration of this time, the acid resistance stability of colorless optical glass was classified in descending order. (GB / T 7962.14-2010)

[0090] Polished glass samples were kept at a constant temperature and humidity of 50 ℃ and 85% for 20 h. The moisture resistance stability of the colorless optical glass was classified in descending order by comparing its turbidity values ​​with those of standard samples H (BaK7) and H (ZK9). (GB / T7962.15-2010)

[0091] The bending strength of glass samples is tested using the three-point bending method. The glass sample is machined to the required dimensions for the test, then placed between two support points, and a fixed load perpendicular to the center of the sample is applied. Then, by applying different bending moments, the bending stress and strain of the glass are measured under different conditions. The bending strength of the glass is finally determined. (GB / T 37781-2019)

[0092] The present invention will be further described below with reference to the embodiments.

[0093] Example 1

[0094] The composition of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0095] The preparation method of high thermal stability cutoff glass is as follows: using quartz sand, aluminum hydroxide, zinc oxide, potassium carbonate, calcium carbonate, basic magnesium carbonate, sodium carbonate, boric acid, selenium powder, and cadmium sulfide as raw materials, avoiding the introduction of nitrates which would result in an oxidizing atmosphere during glass melting, the mixture is thoroughly mixed and then melted at 1500℃ for 8 hours (in a neutral melting atmosphere), mechanically stirred (15 r / min, 3 hours), assisted with high-temperature clarification, and then formed by perforation or pressing at 1450℃ (forming time is 5 minutes) to obtain glass blanks. The glass blanks are then placed in a preheated annealing furnace for annealing and secondary color development at 670℃ for 10 hours. After the holding period, the power is turned off and the glass is slowly cooled to eliminate internal stress and control the cutoff wavelength.

[0096] Example 2

[0097] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0098] The preparation method is the same as in Example 1.

[0099] Example 3

[0100] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0101] The preparation method is the same as in Example 1.

[0102] Example 4

[0103] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0104] The preparation method is the same as in Example 1.

[0105] Example 5

[0106] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0107] The preparation method is the same as in Example 1.

[0108] Example 6

[0109] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0110] The preparation method is the same as in Example 1.

[0111] Example 7

[0112] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0113] The preparation method is the same as in Example 1.

[0114] Example 8

[0115] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0116] The preparation method is the same as in Example 1.

[0117] Example 9

[0118] The components of the high thermal stability cutoff glass in this embodiment, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 1 and 4.

[0119] The preparation method is the same as in Example 1.

[0120] Comparative Examples 1-13

[0121] The composition of the glass in Comparative Examples 1-13, the weight percentage of each component, and the physical properties of the resulting glass are shown in Tables 2, 3, and 5.

[0122] The glass in Comparative Examples 1-13 was prepared according to the method described in Example 1.

[0123] Table 1. Components and contents of high thermal stability cutoff glass in Examples 1-9 of the present invention

[0124]

[0125] Table 2. Composition and content of the glass in Comparative Examples 1-5 of the present invention

[0126]

[0127] Table 3. Components and contents of the glasses in Comparative Examples 6-13 of the present invention

[0128]

[0129] Table 4 Performance test results of glass samples from Examples 1-9

[0130]

[0131] Table 5 Performance test results of glass samples from Comparative Examples 1 to 13

[0132]

[0133] Examples 1-9, through the reasonable addition of appropriate components and control of the proportions of each component in the raw materials, show improved glass strength, thermal stability, transmittance, chemical stability, and resistance to acid and alkali corrosion. Table 4 shows that the optical transmittance of the high thermal stability cutoff glass prepared in Examples 1-9 of this invention is as follows: Maximum transmittance ≥91.0% in the wavelength range of 200-1000 nm. Its overall performance is superior to the glass involved in Comparative Examples 1-13, and its good acid / moisture resistance can maintain the stability of the glass's internal structure over a long period.

[0134] Figure 1 This is a comparison curve of the transmittance of 6 mm thick glass products in the wavelength range of 200-1000 nm between Comparative Example 2 and Example 5.

[0135] As can be seen from the above, the high thermal stability cutoff glass provided in Examples 1-9 of the present invention possesses excellent optical transmittance, heat resistance, high flexural strength, excellent cutoff wavelength, steepness, and good chemical stability. This is because Examples 1-9 of the present invention adjusted the proportions of each component raw material and set appropriate stirring speed and time during the preparation of the high thermal stability cutoff glass. Therefore, the high thermal stability cutoff glass of the present invention has excellent optical transmittance, heat resistance, high flexural strength, excellent cutoff wavelength, steepness, and good chemical stability, and has broad application prospects.

[0136] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Although this application has been described in detail with reference to the above embodiments, those skilled in the art can still make various modifications or equivalent substitutions of some technical features after reading this description. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be considered to fall within the protection scope of this application.

Claims

1. A type of stop glass, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage (mol%): Yeah 4+ 62.1-67.6mol%; Al3 + 0.1-1.1mol%; Zn² + 6.0-8.2mol%; K + 3.5-9.4mol%; Ca² + 0.1-1.0mol%; Mg² + 0.3-1.4mol%; On + 7.3-15.7mol%; B³ + 6.4-12.8mol%; Se² - 0.7-1.5mol%; Cd² + 0.1-0.5mol%; The glass sample with a diameter of 6 mm has a maximum optical transmittance of >91.0% in the 200-1000 nm range, a sag temperature ≥670℃, and a coefficient of thermal expansion ≤67×10⁻⁶ in the temperature range of 20℃ to 300℃. -7 / ℃, cutoff wavelength is 625±15nm, steepness ≥1.0; The glass has a flexural strength >110MPa and both acid resistance and moisture resistance are Class I. Based on mole percentage calculations, Mg 2+ / Ca 2+ The ratio is 1.4-4.0; Based on molar percentage calculations, Al³ + / (Mg² + +Ca² + The value ranges from 0.08 to 2.

2. Based on mole percentage calculations, Se² - / Cd² + The ratio is 2.0-8.0; Based on molar percentage calculations, Zn² + / Se² - The ratio is 4.6-10.

25.

2. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: Yeah 4+ 64.0-67.6mol%; Al³ + 0.5-1.0mol%; Zn² + 6.5-7.7mol%; K + 5.5-9.4mol%; Ca² + 0.3-0.7mol%; Mg² + 0.5-0.8mol%; On + 7.3-11.0mol%; B3 + 8.0-11.5mol%; Se² - 0.8-1.2 mol%; Cd² + 0.2-0.4mol%.

3. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: Yeah 4+ 63-67.6mol%; Al3 + 0.1-1mol%; Zn² + 6.1-7.7mol%; K + 3.6-9.4mol%; Ca² + 0.3-1.0mol%; Mg² + 0.5-1.4mol%; On + 7.3-12.6mol%; B³ + 8-11.2mol%; Se² - 1-1.5mol%; Cd² + 0.2-0.5 mol%.

4. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: Yeah 4+ 63.1-67.6mol%; Al³ + 0.1-1.0mol%; Zn² + 6.7-7.0mol%; K + 6.0-9.4mol%; Ca² + 0.1-0.6mol%; Mg² + 0.4-0.8mol%; Na + 7.3-10.9mol%; B3 + 8.0-11.5mol%; Se² - 0.7-1.2 mol%; Cd² + 0.1-0.4mol%.

5. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: Yeah 4+ 64.2-67.6mol%; Al3 + 0.6-1mol%; Zn² + 6.7-7.7mol%; K + 3.6-9mol%; Ca² + 0.3-0.9mol%; Mg² + 0.5-0.7mol%; Na + 7.3-10.8mol%; B³ + 8.1-11.2mol%; Se² - 1-1.2 mol%; Cd² + 0.2-0.4mol%.

6. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: If 4+ 64.0-64.5mol%; Al³ + 0.9-1.0mol%; Zn² + 6.8-7.0mol%; K + 6.5-6.8mol%; Ca² + 0.4-0.6mol%; Mg² + 0.6-0.8mol%; Na + 7.2-7.5mol%; B3 + 11.0-11.5mol%; Se² - 1.1-1.2 mol%; Cd² + 0.3-0.5 mol%.

7. The stop-type glass according to claim 1, characterized in that, The elements in the network structure of the glass exist in the form of bound ions, comprising, by molar percentage: If 4+ 64.0-65.5mol%; Al³ + 0.5-1.0mol%; Zn² + 6.7-7.0mol%; K + 6.0-8.0mol%; Ca² + 0.3-0.6mol%; Mg² + 0.6-0.8mol%; On + 7.3-9.1mol%; B3 + 10.0-11.5mol%; Se² - 1.0-1.2 mol%; Cd² + 0.3-0.4mol%.

8. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Al³ + / (Mg² + +Ca² + The value ranges from 0.08 to 1.

0.

9. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Al³ + / (Mg² + +Ca² + The value ranges from 0.08 to 0.

85.

10. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Mg² + +Ca² + +Al³ + The sum is 1.0-3.5 mol%.

11. The stop-type glass according to claim 10, characterized in that, Based on molar percentage calculations, Mg² + +Ca² + +Al³ + The sum is 1.0-2.2 mol%.

12. The stop-type glass according to claim 10, characterized in that, Based on molar percentage calculations, Mg² + +Ca² + +Al³ + The sum is 1.3-2.2 mol%.

13. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Se² - / Cd² + The ratio is 3.0-7.

0.

14. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Se² - / Cd² + The ratio is 3.0-5.

0.

15. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + / Se² - The ratio is 4.6-9.

75.

16. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + / Se² - The ratio is 4.6-6.

7.

17. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + / Se² - The ratio is 5.75-6.

7.

18. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + / (Se² - +Cd² + The range is 3.45-8.

6.

19. The stop-type glass according to claim 18, characterized in that, Based on molar percentage calculations, Zn² + / (Se² - +Cd² + The value ranges from 3.45 to 5.

6.

20. The stop-type glass according to claim 18, characterized in that, Based on molar percentage calculations, Zn² + / (Se² - +Cd² + The value is 4.3-5.

6.

21. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + +Se² - +Cd² + The sum is 6.8-9.3 mol%.

22. The stop-type glass according to claim 21, characterized in that, Based on molar percentage calculations, Zn² + +Se² - +Cd² + The sum is 7.6-8.9 mol%.

23. The stop-type glass according to claim 21, characterized in that, Based on molar percentage calculations, Zn² + +Se² - +Cd² + The sum is 7.9-8.9 mol%.

24. The stop-type glass according to claim 21, characterized in that, Based on molar percentage calculations, Zn² + +Se² - +Cd² + The sum is 7.9-8.5 mol%.

25. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Si 4+ / B³ + The ratio is 4.9-9.

9.

26. The stop-type glass according to claim 25, characterized in that, Based on mole percentage calculations, Si 4+ / B³ + The ratio is 5.6-8.

4.

27. The stop-type glass according to claim 25, characterized in that, Based on mole percentage calculations, Si 4+ / B³ + The ratio is 5.6-6.6 or 6.7-8.

35.

28. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Si 4+ +B³ + The sum is 69.6-75.7 mol%.

29. The stop-type glass according to claim 28, characterized in that, Based on mole percentage calculations, Si 4+ +B³ + The sum is 71.1-75.7 mol%.

30. The stop-type glass according to claim 28, characterized in that, Based on mole percentage calculations, Si 4+ +B³ + The sum is 74.9-75.7 mol%.

31. The stop-type glass according to claim 28, characterized in that, Based on mole percentage calculations, Si 4+ +B³ + The sum is 75.5-75.7 mol%.

32. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Si 4+ / (Si 4+ +B³ + The value is 0.83-0.

91.

33. The stop-type glass according to claim 32, characterized in that, Based on mole percentage calculations, Si 4+ / (Si 4+ +B³ + The value is 0.85-0.

9.

34. The stop-type glass according to claim 32, characterized in that, Based on mole percentage calculations, Si 4+ / (Si 4+ +B³ + The value is 0.85-0.86 or 0.87-0.

9.

35. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Na + / K + The ratio is 0.81-3.

42.

36. The stop-type glass according to claim 35, characterized in that, Based on mole percentage calculations, Na + / K + The ratio is 0.81-3.

1.

37. The stop-type glass according to claim 35, characterized in that, Based on mole percentage calculations, Na + / K + The ratio is 1.1-3.

1.

38. The stop-type glass according to claim 35, characterized in that, Based on mole percentage calculations, Na + / K + The ratio is 1.1-1.

52.

39. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Na + +K + The sum is 13.5-20.3 mol%.

40. The stop-type glass according to claim 39, characterized in that, Based on mole percentage calculations, Na + +K + The sum is 13.9-20.1 mol%.

41. The stop-type glass according to claim 39, characterized in that, Based on mole percentage calculations, Na + +K + The sum is 13.9-16.3 mol%.

42. The stop-type glass according to claim 39, characterized in that, Based on mole percentage calculations, Na + +K + The sum is 13.9-15.1 mol%.

43. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, (Na) + +K + ) / B³ + The value ranges from 1.05 to 2.

9.

44. The stop-type glass according to claim 43, characterized in that, Based on mole percentage calculations, (Na) + +K + ) / B³ + The value is 1.23-2.

52.

45. The stop-type glass according to claim 43, characterized in that, Based on mole percentage calculations, (Na) + +K + ) / B³ + It ranges from 1.23 to 1.

87.

46. ​​The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, Si 4+ +Al³ + +B³ + The sum is 70.7-76.8 mol%.

47. The stop-type glass according to claim 46, characterized in that, Based on mole percentage calculations, Si 4+ +Al³ + +B³ + The sum is 71.6-76.5 mol%.

48. The stop-type glass according to claim 46, characterized in that, Based on mole percentage calculations, Si 4+ +Al³ + +B³ + The sum is 74-76.5 mol%.

49. The stop-type glass according to claim 46, characterized in that, Based on mole percentage calculations, Si 4+ +Al³ + +B³ + The sum is 75.5-76.5 mol%.

50. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, (Si) 4+ +Al³ + +B³ + ) / (Na + +K + The range is 3.55-5.

70.

51. The stop-type glass according to claim 50, characterized in that, Based on mole percentage calculations, (Si) 4+ +Al³ + +B³ + ) / (Na + +K + The value ranges from 3.56 to 5.

51.

52. The stop-type glass according to claim 50, characterized in that, Based on mole percentage calculations, (Si) 4+ +Al³ + +B³ + ) / (Na + +K + The value is 4.53-5.

51.

53. The stop-type glass according to claim 50, characterized in that, Based on mole percentage calculations, (Si) 4+ +Al³ + +B³ + ) / (Na + +K + The value is 5.01-5.

51.

54. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, (Si) 4+ +B³ + ) / (Na + +K + +Ca² + +Mg² + The range is 3.33-5.

41.

55. The stop-type glass according to claim 54, characterized in that, Based on mole percentage calculations, (Si) 4+ +B³ + ) / (Na + +K + +Ca² + +Mg² + The value is 3.45-5.

0.

56. The stop-type glass according to claim 54, characterized in that, Based on mole percentage calculations, (Si) 4+ +B³ + ) / (Na + +K + +Ca² + +Mg² + The value is 4.1-5.

57. The stop-type glass according to claim 54, characterized in that, Based on mole percentage calculations, (Si) 4+ +B³ + ) / (Na + +K + +Ca² + +Mg² + The value is 4.6-5.

58. The stop-type glass according to claim 1, characterized in that, Based on mole percentage calculations, (Al³) + +Mg² + +Ca² + ) / (Se² - +Cd² + The range is 0.90-2.

34.

59. The stop-type glass according to claim 58, characterized in that, Based on mole percentage calculations, (Al³) + +Mg² + +Ca² + ) / (Se² - +Cd² + The value ranges from 0.9 to 2.

0.

60. The stop-type glass according to claim 58, characterized in that, Based on mole percentage calculations, (Al³) + +Mg² + +Ca² + ) / (Se² - +Cd² + The value is 1.0-2.

0.

61. The stop-type glass according to claim 58, characterized in that, Based on mole percentage calculations, (Al³) + +Mg² + +Ca² + ) / (Se² - +Cd² + The range is 0.90-1.

40.

62. The stop-type glass according to claim 58, characterized in that, Based on mole percentage calculations, (Al³) + +Mg² + +Ca² + ) / (Se² - +Cd² + The value ranges from 1.08 to 1.

375.

63. The stop-type glass according to claim 1, characterized in that, Based on molar percentage calculations, Zn² + / (Al³ + +Mg² + +Ca² + The value ranges from 1.9 to 6.

8.

64. The stop-type glass according to claim 63, characterized in that, Based on molar percentage calculations, Zn² + / (Al³ + +Mg² + +Ca² + The value ranges from 3.1 to 6.

8.

65. The stop-type glass according to claim 63, characterized in that, Based on molar percentage calculations, Zn² + / (Al³ + +Mg² + +Ca² + The value ranges from 3.1 to 5.

5.

66. The stop-type glass according to claim 63, characterized in that, Based on molar percentage calculations, Zn² + / (Al³ + +Mg² + +Ca² + The range is 3.1-5.

2.

67. A method for preparing the cutoff glass according to any one of claims 1 to 66, characterized in that, include: Mix the raw materials containing silicon, aluminum, zinc, potassium, calcium, magnesium, sodium, boron, selenium and cadmium evenly; The resulting mixture was melted at 1500~1600℃ in a neutral or weakly reducing atmosphere while being stirred. Then it undergoes clarification and shaping.

68. The method according to claim 67, characterized in that: The melting time is 8 to 16 hours; The stirring speed is 10~30 r / min, and the stirring time is 3~12 hours; The molding temperature is 1400~1450℃, and the molding time is 5~25 minutes; After molding, further heat treatment is carried out to achieve annealing and secondary color development. The heat treatment temperature is 640~670℃ and the holding time is 6~10h.

69. The application of the cut-off glass according to any one of claims 1 to 66 in optical elements or in optical window glass for image mapping under complex lighting conditions.

70. The application according to claim 69, characterized in that, The cut-off glass is used to manufacture optical elements for use in complex lighting environments, which are at least one of the following: environments with large temperature fluctuations, environments requiring precise spectral screening, environments with mechanical stress, or environments with chemical corrosion. The optical elements include optical windows, lenses, or filters.

71. An optical element, characterized in that: It includes the cut-off glass according to any one of claims 1 to 66; The optical element is a filter or an optical lens.

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