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A germanate infrared-transmitting glass and its preparation method

An infrared-transmitting, germanate technology, which is applied in glass manufacturing equipment, glass forming, manufacturing tools, etc., can solve the problems of difficult processing and forming, difficult forming of spinel, limited application range and service life, etc. The effect of market application prospect, good mask processing performance and excellent chemical stability

Active Publication Date: 2022-05-10
鲁米星特种玻璃科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the infrared-transmitting cover materials used for 1μm-5μm mid-infrared rays mainly include ZnS, spinel, sapphire and other materials. Although these materials have advantages in certain properties, they can be used as general infrared window materials, but for high-speed The infrared cover of the aircraft still has various deficiencies in its thermal shock resistance
[0005] For example, the infrared transmittance of ZnS is high, and it is easy to process into the required window or cover shape, but the material of ZnS itself is very soft, and it is extremely easy to be worn under normal conditions, which limits its application range and service life. In actual use, it can be improved by coating a protective film, but the high temperature generated by friction with the air during the high-speed flight of a missile or rocket will cause the coated film to fall off
[0006] Spinel (mainly composed of magnesium-aluminum oxide minerals) has slightly poorer infrared transmittance than ZnS, and it has partial absorption at a wavelength of 5 μm, but its hardness is more than ten times that of ZnS, and its fracture toughness is higher, so Strong thermal shock resistance, but spinel is difficult to form, it is very difficult to process into windows or covers, and the cost of materials and processing is very high
[0007] The infrared transmission performance of sapphire (belonging to the corundum group minerals, the main component is aluminum oxide (Al2O3)) is the same as that of spinel, and its hardness and fracture toughness are 40% higher than that of spinel. Windows and covers made of sapphire The body is highly wear-resistant and can be used for supersonic speeds, but the manufacturing cost of this material is high, and because of its high hardness, it is difficult to process and form, and the processing cost is very expensive

Method used

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  • A germanate infrared-transmitting glass and its preparation method
  • A germanate infrared-transmitting glass and its preparation method
  • A germanate infrared-transmitting glass and its preparation method

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preparation example Construction

[0067] The present invention also provides a preparation method of germanate infrared-transmitting glass, comprising the following steps:

[0068] Step 1, glass batching: Before batching, the glass raw materials are subjected to high-temperature burning and dehydration treatment. Water vapor is the main component of the gas in the glass. It is based on [OH] - The form exists in the glass, which has an absorption band at 2.9 μm, and another gas CO in the glass 2 There is an absorption band at 2.7μm, strictly control the moisture and hydroxyl content of the raw materials, then mix the high-purity raw materials according to the designed components, and convert the corresponding raw material weights according to the weight percentage of each component, and then weigh each raw material , where Al 2 o 3 Introduced by alumina powder, without using hydroxide material, BaO is introduced by Ba(NO 3 ) 2 introduce;

[0069] Step 2, glass melting: Grind and mix the glass batch materia...

Embodiment 1

[0075]

[0076] First, select glass raw materials according to the glass composition of Example 1 in Table 1, raw material requirements, alumina powder (high purity, 150 μm sieve is less than 1%, 45 μm sieve is 30%), germanium oxide (400 μm sieve 10% or less, 63μm undersize is 10% or less), calcium carbonate (analytical pure, average particle size 250μm), strontium carbonate (analytical pure, purity ≥ 99.0%), barium nitrate (analytical pure, purity ≥ 99.0%) , barium fluoride (analytically pure, purity ≥ 99.0%), titanium oxide (analytical pure), bismuth oxide (analytical pure), lanthanum trioxide (5N), gadolinium oxide (5N), and the main raw materials in the glass raw materials Carry out high-temperature burning and dehydration treatment to reduce the moisture and hydroxyl content of glass raw materials, and strictly control the moisture and hydroxyl content of raw materials; then mix high-purity raw materials according to the glass chemical composition in Table 1, and then w...

Embodiment 2

[0078]

[0079] The actual composition of the glass refers to Example 2 in Table 1, uses the same raw materials and raw material requirements as in Example 1, and adopts a melting process system that melts at 1550 ° C for 2 hours and the same test conditions as in Example 1. Table 1 shows The basic performance of the sample. The transmittance of a glass sample with a thickness of 2 mm in the wavelength range of 1 μm to 5 μm is > 85%;

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Abstract

The invention discloses a germanate infrared-transmitting glass and a preparation method thereof. The infrared-transmitting glass consists of the following components in weight percent: 5-45% GeO 2 , 15‑30% Al 2 o 3 , 5‑35% CaO, 0‑5% SrO, 1‑15% BaO, 1‑5% BaF 2 , 0‑5% Bi 2 o 3 , 1‑5% TiO 2 , 6‑16% La 2 o 3 , 1‑20% Gd 2 o 3 . The present invention also provides a preparation method of germanate infrared-transmitting glass, which includes the following steps: glass batching: before batching, the glass raw materials are subjected to high-temperature burning and dehydration treatment, and then each raw material is weighed according to the weight percentage of each component; the glass Melting: put the mixture into a platinum crucible, then put it into a glass melting furnace at 1400-1600°C and heat it for 1-3 hours; quenching molding: after the glass is melted evenly, pour the melted glass liquid into the preheated The good mold is poured into the specified specifications, then put into the annealing furnace for annealing treatment, and then cooled to room temperature with the furnace, and the germanate infrared-transmitting glass material can be obtained after cooling. The preparation method of the invention is simple, and the prepared germanate infrared-transmitting glass has excellent performance.

Description

technical field [0001] The invention relates to the technical field of infrared-transmitting glass and its preparation, in particular to a germanate infrared-transmitting glass and a preparation method thereof. Background technique [0002] Infrared is an electromagnetic wave with a wavelength range between microwave and visible light. The wavelength range is between 0.75 μm and 500 μm. It is an invisible light with a wavelength longer than that of red light. It has thermal effects, is invisible to the naked eye, and has a strong ability to pass through clouds, etc. features. Infrared rays can be divided into three parts, namely near-infrared rays (wavelength range of 0.75 μm to 2.5 μm), mid-infrared rays (wavelength range of 2.5 μm to 25 μm), and far infrared rays (wavelength range of 25 μm to 500 μm). Infrared rays are widely used in electronic communication, remote sensing test, industrial detection, environmental monitoring, biomedicine, national defense and military, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/253C03C4/10C03B19/02
CPCC03C3/253C03C4/10C03B19/02
Inventor 陈玉栋陈嘉慧张芬香
Owner 鲁米星特种玻璃科技股份有限公司
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