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Infrared transmitting germanate glass containing fluoride

A technology of germanate glass and fluoride, which is applied in the field of infrared windows, can solve problems such as the inability to eliminate the influence of moisture, difficult pouring, and difficult gas removal.

Inactive Publication Date: 2002-10-23
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

[0006] (2) High viscosity: The viscosity of germanate glass is very high, so the gas generated during glass melting is not easy to get rid of, pouring is difficult, and defects such as bubbles and streaks are prone to occur, which affects the quality of the glass and is difficult to meet optical requirements.
[0008] In the process of preparing germanate glass, water molecules are easily mixed into germanate glass, causing hydroxide groups to exist in the glass structure. On the one hand, the glass is easy to devitrify and the chemical stability is reduced; A strong absorption occurs at a wavelength of 3 μm, and the signal transmission of the glass between 3.0 and 4.0 μm will also be greatly affected
The influence of moisture cannot be eliminated by technological measures in the glass melting process alone. If the wave band greatly affected by hydroxyl absorption is in the main working area of ​​the window, the influence of moisture will be fatal

Method used

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  • Infrared transmitting germanate glass containing fluoride
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Examples

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example 1

[0023] Example 1: by BaF 2 -GaF 3 -Ga 2 o 3 -GeO 2 The composition of the glass, the content of each compound is 10%-5%-5%-80% (mole percentage), 100g of glass is melted in a platinum crucible according to the conventional glass preparation method, the melting temperature is 1350 ° C, and the prepared glass is no The color is transparent.

example 2

[0024] Example 2: by MgF 2 -BaF 2 -GaF 3 -In 2 o 3 -GeO 2The composition of the glass, the content of each compound is 5%-15%-10%-6%-64% (molar percentage), 100g of glass is melted in a platinum crucible according to a conventional glass preparation method, and the melting temperature is 1370°C. The glass is colorless and transparent.

example 3

[0025] Example 3: By BaF 2 -AlF 3 -Ga 2 o 3 -GeO 2 The composition of the glass, the content of each compound is 30%-10%-15%-45% (mole percentage), 100g of glass is melted in a platinum crucible according to the conventional glass preparation method, the melting temperature is 1350 ° C, and the prepared glass is no The color is transparent.

[0026] Example 4: By BaF 2 -ZrF 4 -GaF 3 -Ga 2 o 3 -GeO 2 The composition of the glass, the content of each compound is 20%-10%-5%-5%-60% (molar percentage), 100g of glass is melted in a platinum crucible according to a conventional glass preparation method, and the melting temperature is 1300°C. The glass is colorless and transparent.

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PUM

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Abstract

The present invention relates to an infrared ray transmitting fluoride-containing germanate glass, which is characterized by that it combines the fluoride and oxide glass, and the GeO2 containing germanate glass composition at least contains two metal fluorides of MF2, MF3 and MF4. In the composition of said germanate glass the addition of fluoride can reduce glass melting temp., reduce glass viscosity and refractive index, can greatly reduce OH group content in the glass and increase the transmittance of 3-5 micrometer wave range, and its transmittance at 3 micrometer wave range can be raised to above 82% from about 25% of existent technology.

Description

Technical field: [0001] The invention relates to a fluoride-containing germanate glass, which is suitable for use as an optical material whose working wave band is in the near ultraviolet to mid-infrared band, and is especially suitable for an infrared window. Background technique: [0002] Commonly used infrared-transmitting window materials include crystals, glass, etc., and the materials are required to have a higher transmittance in the range of 3-5 μm. These materials have a wide range of application requirements in aerospace, military and civil fields. Germanate glass is a heavy metal oxide glass with good glass-forming properties. Germanate glass has good optical properties and good electrical insulation properties. The resistance at 25 ° C is 10 13 Ohm, germanate glass has good chemical stability, the refractive index can be adjusted according to requirements, the cut-off wavelength in the ultraviolet region is less than 400nm, and the infrared cut-off wavelength is...

Claims

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Application Information

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IPC IPC(8): C03C3/23C03C3/253C03C4/10
CPCC03C3/253C03C3/23C03C4/10
Inventor 胡和方曹国喜干福熹
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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