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Method for preparing infrared transmitting germanate/gallate optical glass

A technology of optical glass and gallate, applied in glass manufacturing equipment, glass molding, glass furnace equipment, etc., can solve the problems of chloride volatilization, environmental pollution, unsuitable for industrial production, etc., to improve activity and accelerate chemical Response, the effect of reducing the amount of processing

Active Publication Date: 2010-07-14
杭州恒影科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obvious defect of this scheme is that too much chloride is used, and a large amount of chloride is volatilized during the drying process, which pollutes the environment and is not suitable for industrial production.

Method used

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  • Method for preparing infrared transmitting germanate/gallate optical glass
  • Method for preparing infrared transmitting germanate/gallate optical glass
  • Method for preparing infrared transmitting germanate/gallate optical glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 25GeO made of glass 2 +30Ga 2 o 3 +25BaO+5Al 2 o 3 +15BaF 2 A total of 2kg of glass raw materials, various powders are placed in a ball mill and fully mixed.

[0027] a) Pre-dewatering of raw materials: drying the powdered raw materials at 300°C for 24 hours. After the raw materials were transferred to platinum crucibles, they were placed in an electric furnace at a temperature of 300°C. Oxygen and CCl are introduced into the electric furnace 4 Mixed gas, keep warm for 10 hours, where CCl 4 The flow ratio of gas and oxygen is controlled to be 10:100;

[0028] b) Melt the powder raw material at a heating rate of 300°C / hour to 1350°C, and change to an inert gas protection when the temperature rises to close to 600°C, and the inert gas is nitrogen;

[0029] c) After putting a stirring paddle into the glass liquid and stirring for 6 hours, the protective gas was changed to 35:100 O 2 : Mixed gas of Ar, maintain the aeration protection state while stirring for 1 ho...

Embodiment 2、3、4、5、6 and 7

[0033] Embodiments 2, 3, 4, 5, 6 and 7: using the same glass composition as in Embodiment 1, similar process, the difference of each step is shown in the following table 1; in addition, in step c, maintain the state of stirring and aeration protection at the same time After 3 hours, the platinum particle content and hydroxyl content of the obtained sample are also marked in the corresponding positions in the table.

Embodiment 8

[0035] The composition of the glass is the same as that of Example 7, and the process is similar, the difference is that the state of stirring and aeration protection is maintained for 2 hours to obtain a high-quality infrared glass with a platinum particle concentration of 600 / L and a moisture content of less than 10 ppm in the infrared glass, which meets the requirements of general infrared optics. glass requirements.

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Abstract

A method for preparing infrared germanate / gallate glass comprises the following steps: pre-dehydrating raw materials; moving the mixed raw materials for preparing the infrared transmitting germanate / gallate optical glass to a platinum crucible, then putting the platinum crucible into an electric furnace at 100-600 DEG C, introducing the gas mixture of oxygen and CC14 into the electric furnace and preserving heat for more than 3h; protecting the pre-dehydrated raw materials with nitrogen or argon, keeping heating the raw materials in the electric furnace to molten state and stirring the molten raw materials; changing the protecting gas into the gas mixture of O2:N2 or O2:Ar or O2:N2+Ar 1-8h before pouring glass melt; and obtaining the corresponding optical glass after pouring, annealing and physical polishing by employing the common glass forming process, wherein the flow ratio of CC14 to oxygen is controlled as (4-15):100, and the flow ratio of the inert gas to oxygen is (5-50):100. By the method, the glass without stripes and flash points inside and with little hydroxy can be prepared.

Description

technical field [0001] The present invention relates to infrared optical glass, in particular to a method for preparing infrared-transmitting germanium and gallate optical glass, in particular to a method for preparing glass containing gallium oxide or germanium oxide which has high transmittance for both visible light and mid-infrared light- . Background technique [0002] In previous patents (Chinese Patent Application No.: 200610028867.3; Chinese Patent Application No.: 200710046650.X), two types of wide-band high-transmittance glass compositions with excellent performance have been reported. US Patent No. 5305414 (Patent No.) and US2005 / 0159289A1 (Application No.) put forward corresponding protection requirements for some compositions of germanate glass. Adding less than 30 mol% of germanium dioxide on the basis of the binary composition of alumina and calcium oxide can also obtain a glass material that is transparent to the mid-infrared (see Chin.J.Phys., 35(1): 78- 8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B5/235C03B19/02
Inventor 张龙袁新强范有余
Owner 杭州恒影科技有限公司
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