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Sapphire and germanate glass infrared composite material and preparation method thereof

A technology of germanate glass and composite materials, applied in chemical instruments and methods, glass/slag layered products, instruments, etc., can solve the problem that infrared material crystals or glass are difficult to meet these requirements at the same time, poor heat resistance and mechanical shock , low hardness and other problems, to achieve the effect of reduced processing and polishing costs, low manufacturing and processing costs, and excellent comprehensive performance

Inactive Publication Date: 2008-12-10
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Infrared glass generally has low hardness, high brittleness, poor heat resistance and mechanical shock
[0005] It can be seen that it is basically difficult for the above-mentioned infrared material crystals or glasses to meet these requirements at the same time.

Method used

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  • Sapphire and germanate glass infrared composite material and preparation method thereof
  • Sapphire and germanate glass infrared composite material and preparation method thereof
  • Sapphire and germanate glass infrared composite material and preparation method thereof

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preparation example Construction

[0035] The preparation method of sapphire and germanate glass infrared composite material of the present invention comprises the following steps:

[0036] ① Selection of germanate glass

[0037] The selected germanate glass has an average transmittance of not less than 70% in the 0.4-5μm band, and the refractive index of the selected germanate glass matches that of sapphire, with a deviation range of ±0.05; the selected germanium The thermal expansion coefficient of salt glass matches that of sapphire within ±1×10 -6 / K;

[0038] ②Processing of sapphire and germanate glass

[0039] Process the selected sapphire and germanate glass into components of the desired shape, respectively polish the joint surfaces of the components, and place them in absolute ethanol for ultrasonic cleaning;

[0040] ③ Thermal compounding

[0041] In a clean environment, put the polished surfaces of the components together and place them under high temperature for uniform pressure compounding; the...

Embodiment 1

[0044] Select the mole percentage to divide into 34GeO 2 -12Ga 2 o 3 -6Al 2 o 3 -12BaO-30CaO-6Nb 2 o 5 The main properties and parameters of the germanate glass are shown in glass 1 in Table 1. Then the glass is processed into a disc with a diameter of 20 mm and a thickness of 3 mm, one side of the disc and the sapphire sheet are polished, and then cleaned with absolute ethanol. After drying, put the two wafers together in a clean environment with the cleaned and polished surface directly, then put them into the electric furnace, and keep the wafer load evenly under pressure, with a pressure of 5×10 5 Pa. Raise the temperature at a rate of 5°C / min to 700°C for 8 hours, then cool down to 680°C at a rate of 5°C / min and hold for 6 hours for annealing, and then cool down to room temperature at a rate of 1°C / min.

[0045] After the sample in this example is polished on the surface, the thicknesses of sapphire and germanate glass in the 5mm thick sample are respectively 3mm ...

Embodiment 2

[0047] Select the mole percentage to divide into 60GeO 2 -12Ga 2 o 3 -6Al 2 o 3 -12BaO-5Nb 2 o 5 -5CaO germanate glass, its main property parameters are shown in glass 2 in Table 1. Prepare and process germanate glass and sapphire sheet by the same method as in Example 1, then ultrasonically clean the glass sheet and sapphire sheet with anhydrous alcohol, and then insert a layer of pre-designed and cleaned gold screen between the two After gridding, place it in the electric furnace. A load is applied to the disc to make it evenly compressed, and the pressure is 5×10 5 Pa. Raise the temperature to 690°C at a rate of 5°C / min for 10 hours, then cool down to 620°C at a rate of 5°C / min and hold for 6 hours for annealing, and then cool down to room temperature at a rate of 0.1°C / min.

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Abstract

The invention provides an infrared composite material of sapphire and germinate glass and a preparation method thereof. The material comprises the sapphires and the germinate glass closely combined with the sapphires, or also a layer of metal grid capable of resisting electromagnetic interference arranged between the sapphires and the germinate glass. The preparation method is to thermally bond the sapphires and the germinate glass at a temperature above that of the softening point of glass. The infrared composite material of the sapphire and the germinate glass has high transmittance at the wide bands of between 0.4 and 5mu m, thereby meeting the requirements of an infrared photoelectric system working in severe rugged environment on window materials. The material can be applied to windows and fairings for various visible light, intermediate infrared light and millimeter waves.

Description

technical field [0001] The invention relates to an infrared material, in particular to an infrared composite material combined with sapphire crystal and germanate glass and a preparation method thereof, which has good transmittance in visible to mid-infrared bands. Background technique [0002] Optical materials with high transparency in the 0.4-5μm band are widely used in civilian and military fields, such as infrared imaging, infrared night vision, environmental pollution detection, laser ranging and other optoelectronic systems. In recent years, they have involved the world Many countries are working hard to develop various infrared military systems, such as infrared guided missile fairings, high-energy laser weapon systems, photoelectric radars, etc. The development trend of precision-guided wide-band multi-mode composite, high Mach number of missiles and advanced fighters not only requires infrared materials to have high transmittance in the visible, infrared and millim...

Claims

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Application Information

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IPC IPC(8): C03C27/00B32B17/06B32B3/24B32B15/02B32B37/06G02B1/00
Inventor 张龙唐彬范有余胡和方杭寅
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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