A kind of deep ultraviolet glass and its preparation method, application and melting device

A UV and glass technology, applied in glass manufacturing equipment, glass furnace equipment, glass forming, etc., can solve the problems of small geometry, no practical value, large difference in thermal expansion coefficient of Kovar alloy, etc.

Active Publication Date: 2021-09-28
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

Among them, fluoride crystals (such as CaF 2 , MgF 2 Crystal) Because single crystal growth is difficult, processing and preparation is difficult, expensive, and crystals have inherent defects due to anisotropy, poor chemical stability, and geometrically small, so the application is limited; and halide glass contains fluoride and chloride , during the high-temperature melting process of glass, these halides cause a certain degree of erosion on the platinum crucible, which increases the cost and hidden dangers of production safety, making the preparation conditions demanding and expensive; although high-purity quartz glass transmits at 254nm The melting rate of quartz glass is as high as 91%, but the melting temperature of quartz glass is high, the preparation conditions are harsh, and the price is expensive. The application is also limited; phosphate glass cannot meet the sealing performance requirements of special glass due to reasons such as high thermal expansion coefficient, poor chemical stability, and low mechanical strength. Its application environment is greatly restricted and cannot meet the use environment of key weapons In addition, there is beryllium-containing glass, which has good ultraviolet transmittance, but the raw material BeO is a highly toxic substance, and the chemical stability of beryllium glass is also extremely poor, which has no practical value; there is also high-boron ultraviolet glass, the main problem is chemical The stability is poor, and it can only be used for low-end users such as ultraviolet germicidal lamps, and there is a lack of high-end ultraviolet glass materials for deep ultraviolet fields
[0005] With the strengthening of national defense science and technology and the strengthening of environmental protection concepts and efforts in recent years, in deep ultraviolet detection and other application fields, the environmental protection requirements for glass materials are gradually increasing, but there are no reports on environmentally friendly deep ultraviolet penetration glass materials. , and in order to improve the detection sensitivity of the ultraviolet detection system, it is required to have as high a transmittance as possible in the range of 200-300nm, and the glass preparation process is particularly important, and the melting and molding of the glass can affect the quality of glass stripes, bubbles, etc.
Foreign UV-transparent glass material products mainly include Schott’s 8337B from Germany and Corning’s 9471 UV-transparent glass material from the United States, and their thermal expansion coefficients are (48~55)×10 -7 / °C, the transmittance of the two at 200nm is 40% and 35% respectively (thickness 1mm), and the transmittance at 185nm is even lower, which is far from meeting the detection requirements of deep ultraviolet penetration

Method used

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  • A kind of deep ultraviolet glass and its preparation method, application and melting device
  • A kind of deep ultraviolet glass and its preparation method, application and melting device
  • A kind of deep ultraviolet glass and its preparation method, application and melting device

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preparation example Construction

[0047] The present invention also provides a method for preparing the above-mentioned penetrating deep ultraviolet glass, comprising the following steps:

[0048] (1) Iron removal and conversion: the raw materials are subjected to iron removal treatment, then the high-purity raw materials are proportioned according to the designed components, and the corresponding raw material weights are converted according to the weight percentage of each component, and then each raw material is weighed;

[0049] The main raw materials are subjected to iron removal treatment to improve the purity of glass raw materials, because the harmful impurities in UV-transparent glass mainly come from transition metal oxides, which have a strong absorption effect on deep ultraviolet rays due to their relatively rich energy band structure; Strictly control the batching utensils during the batching process to avoid introducing new impurities in the process. The materials used in the batching operation, su...

Embodiment 1

[0070] At first, select glass raw material according to table 1 embodiment 1 glass composition, raw material requirement, quartz sand (high purity, 150 μ m sieve is below 1%, 45 μ m sieve is below 30%, Fe 2 o 3 content less than 1PPm), boric anhydride (400μm sieve is less than 10%, 63μm sieve is less than 10%), aluminum acetate (analytical pure), lithium carbonate (analytical pure), potassium carbonate (analytical pure), barium carbonate (analytical pure), zinc oxide (analytical pure), zirconia (analytical pure) and the main raw materials in the glass raw materials are subjected to iron removal treatment to improve the purity of the glass raw materials, and the oxides of variable valence elements such as Fe 2 o 3 etc. are strictly controlled, and the finished glass Fe 2 o 3 The content is less than 1PPm. Before batching, the main raw materials need to be dehydrated by high-temperature burning; then the high-purity raw materials are proportioned according to the glass chemic...

Embodiment 2

[0072] The actual composition of the glass refers to Example 2 in Table 1, using the same raw materials and raw material requirements as in Example 1, and taking the mixture into the platinum crucible of the melting device, and then heating it in a glass melting furnace at 1200 ° C for 50 minutes Then continue to heat up to 1600 ℃ melting process system and the test condition identical with embodiment 1 with the heating rate of 5 ℃ / min to 1600 ℃ for 4 hours, the basic performance of sample is shown in table 1. (1) When the wavelength is 185nm, the ultraviolet light transmittance reaches 57.3%; (2) The average linear expansion coefficient of 30-300°C is 48×10 -7 / °C.

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Abstract

The invention discloses a deep-transparent ultraviolet glass and a preparation method, application and melting device thereof. The deep-transparent ultraviolet glass comprises the following components by weight: 50.0-58.0% SiO 2 , 8.5‑10.0% Al 2 O 3 , 20.5‑30.0% B 2 O 3 , 0.5‑2.0%Li 2 O, 0.5‑2.5% K 2 O, 6.0‑10.0% BaO, 0.5‑1.0% ZnO, 0.5‑1.0% ZrO 2 . The invention also provides a preparation method of deep ultraviolet glass, which is simple, environmentally friendly and pollution-free, does not introduce heavy metal ions that are harmful to the environment, and has a low melting temperature. The melting device of the invention has the advantages of simple structure, can effectively realize the melting uniformity of the ultraviolet-transmitting glass liquid, and effectively remove the bubbles and streaks in the glass liquid.

Description

technical field [0001] The invention relates to the technical field of special glass material and its preparation, in particular to a deep ultraviolet penetration glass and its preparation method, application and melting device. Background technique [0002] Ultraviolet radiation is a kind of electromagnetic wave ubiquitous in nature. The light with a wavelength of less than 380nm in the solar spectrum is called ultraviolet radiation (Ultraviolet Radiation), which plays an important role in ultraviolet sterilization, ultraviolet counterfeiting, ultraviolet lighting, etc. , eyes, etc. will also produce certain harm. [0003] Ultraviolet rays are divided into three types according to their wavelength range: UV-A (315-380nm), UV-B (280-315nm), and UV-C (100-280nm). The ultraviolet rays contained in sunlight pass through the atmosphere and are less than 290nm Most of the UV-C is absorbed by the ozone layer in the atmosphere. This part of the ultraviolet spectral region is calle...

Claims

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Application Information

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IPC IPC(8): C03C4/00C03C1/02C03B5/235C03B19/02C03C3/093
CPCC03B5/235C03B19/02C03C1/02C03C3/093C03C4/0085
Inventor 贾金升冯跃冲吕学良张磊
Owner CHINA BUILDING MATERIALS ACAD
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