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Fire-polishing blackening preparation method of anti-halation step-like glass

A fire polishing and step technology is applied in the field of fire polishing and blackening preparation of anti-halation step glass, which can solve the problems of large difference in thickness of black glass layer, inconsistent thinning amount, thinning of black glass layer, etc. The time required for blackening, the blackening cycle is accelerated, and the processing time is short.

Active Publication Date: 2019-05-03
GUANGZHOU HONSUN OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the anti-halation step glass black glass layer obtained by the blackening process has the problem of insufficient surface finish, and the molding process requires manual polishing of the black glass layer on the slope, step surface and cylindrical surface to achieve the required smoothness. , the thickness of the polished black glass layer is greatly reduced, and the thickness of the polished black glass layer is very different, which seriously affects the absorption effect of the black glass layer on stray light
In addition, manually polishing the anti-halation step glass will not only make the black glass layer thinner, but also cause parallelism due to inconsistent thinning

Method used

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  • Fire-polishing blackening preparation method of anti-halation step-like glass

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Experimental program
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Effect test

Embodiment 1

[0040] After the anti-halation stepped glass blank is formed, it is placed in a closed high-temperature furnace with a reducing atmosphere, and 99.99% H 2 ; by controlling H 2 The pressure reducing valve at the gas source maintains the gas pressure in the reducing atmosphere furnace at a slight positive pressure of 0.01-0.02MPa, and the gas flow rate is controlled within the range of 0.2L / min-1L / min; the furnace temperature is first raised from room temperature to 500 ℃, and keep warm at 500℃ for 2-4 hours to completely decompose and volatilize the impurities on the surface of the blank, because the impurities on the glass surface will occupy the surface position and form a high surface barrier, so the impurities on the surface must be removed to ensure the prevention The surface of the halo step glass blank reaches atomic level cleanliness; secondly, the temperature is raised from 500°C to the temperature required for blackening, and kept for a period of time, the blackening ...

Embodiment 2

[0042] After the anti-halation stepped glass blank is formed, it is placed in a closed high-temperature furnace with a reducing atmosphere, and 99.99% H 2 ; by controlling H 2 The pressure reducing valve at the gas source maintains the gas pressure in the reducing atmosphere furnace at a slight positive pressure of 0.01-0.02MPa, and the gas flow rate is controlled within the range of 0.2L / min-1L / min; the temperature of the reducing atmosphere furnace first changes from room temperature Raise the temperature to 200°C and keep it warm at 200°C for 2-4 hours to volatilize the water molecules and other impurities that are easy to desorb on the surface of the glass blank, and with the H 2 Then, the temperature is raised from 200°C to 500°C, and the holding time at 500°C is 2 to 4 hours, so that the impurities on the surface of the blank are completely decomposed and volatilized, ensuring that the surface of the anti-halation step glass blank reaches atomic level cleanliness; again ...

Embodiment 3

[0044] After the anti-halation stepped glass blank is formed, it is placed in a closed high-temperature furnace with a reducing atmosphere, and 99.99% H 2 ; by controlling H 2 The pressure reducing valve at the gas source maintains the gas pressure in the reducing atmosphere furnace at a slight positive pressure of 0.01-0.02MPa, and the gas flow rate is controlled within the range of 0.2L / min-1L / min; the temperature of the reducing atmosphere furnace first changes from room temperature Raise the temperature to 200°C and keep it at 200°C for 2-4 hours; then raise the temperature from 200°C to 500°C and keep it at 500°C for 2-4 hours to completely decompose and volatilize the impurities on the surface of the anti-halation step glass blank; again from 500 ℃ to the temperature required for blackening, and keep it warm for a period of time, the blackening temperature is 550°C ~ 650°C, and the blackening time is 100h ~ 150h; finally, heat up from the blackening temperature to the fi...

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Abstract

The invention discloses a fire-polishing blackening preparation method of anti-halation step-like glass. The preparation method includes the steps of: 1) placing anti-halation step-like glass roughcast in a sealed furnace and feeding a reductive gas in a flowing manner of simultaneously feeding and discharging the gas; 2) heating the sealed furnace from room temperature to a preheating temperature, removing impurities of the anti-halation step-like glass roughcast, heating the roughcast to blackening temperature to blacken the roughcast, and heating the roughcast to a fire-polishing temperature to perform fire-polishing treatment. The preparation method is short in treatment time and high in efficiency. The black glass can achieve the polishing effect in finish degree without any treatment.

Description

technical field [0001] The invention relates to the field of optical materials, in particular to a fire-polishing and blackening preparation method of anti-halation stepped glass. Background technique [0002] Anti-halation stepped glass is a kind of light-transmitting glass with a black glass layer on the surface. The finished product schematic diagram is attached figure 1 shown. Anti-halation step glass is mainly used in image intensifiers of low-light night vision instruments, as the input window of single-stage image intensifiers, used to eliminate stray light and deposit multi-alkali photocathode. Since the black glass layer can absorb the incident and reflected light on its surface, compared with the input window of the optical fiber panel, the anti-halation stepped glass can eliminate the scattered light caused by stripes, bubbles and other defects and the reflected light of the optical path system, greatly Amplitude increases the image resolution and sensitivity of...

Claims

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Application Information

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IPC IPC(8): C03B29/00
Inventor 姚雪芬何相平王斌吴逸文黄朋李建杰
Owner GUANGZHOU HONSUN OPTOELECTRONICS
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