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Sintering method for preform rod powder of optical fiber

A technology of optical fiber preform and sintering method, which is applied in the field of sintering, can solve the problems of difficulty and difficulty in both sintering transparency and diameter unevenness, short sintering time, and long sintering time, so as to achieve standardized large-scale production and improve product quality. Effects of quality and productivity, shortening of sintering time

Active Publication Date: 2020-11-24
威海长和光导科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problem that the sintering method of the existing optical fiber prefabricated rod powder has a long sintering time and is difficult to balance the sintering transparency and the unevenness of the diameter, and provides a short sintering time which can take into account both the sintering transparency and the unevenness of the diameter. Sintering method of optical fiber preform powder body

Method used

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  • Sintering method for preform rod powder of optical fiber
  • Sintering method for preform rod powder of optical fiber
  • Sintering method for preform rod powder of optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Select the preformed rod powder body for sintering, and the density of the preformed rod powder body is 0.35g / cm 3 , The ideal diameter of the preformed rod powder after sintering is 127.65mm, the theoretical diameter range is 122.54-132.75mm, and the tail handle diameter is 35mm.

[0053] Set the early warning value of the diameter of the tail shank to 33.5mm, because when the diameter of the tail shank in the sintering furnace is less than 33.5mm, the tail shank is easy to break, and the preform powder body is easy to fall into the furnace body, which will cause equipment damage.

[0054] The original process method is used for sintering, and the white mist length of the effective body part is 8mm. Sintering using the process method of this application, the downward moving distance of stage 4 is 20mm, the descending speed is 4.8mm / min, the rotation speed is 2rmp, and the temperature of the vitrification sintering zone is kept at 1530°C in stage 3. When moving down to...

Embodiment 2

[0066] Select the preformed rod powder body for sintering, and the density of the preformed rod powder body is 0.4g / cm 3 , The ideal diameter of the preformed rod powder body after firing the preformed rod powder body is 125.6mm, the theoretical diameter range is 120.57-130.62mm, and the tail handle diameter is 35mm.

[0067] Set the early warning value of the diameter of the tail shank to 33.5mm, because when the diameter of the tail shank in the sintering furnace is less than 33.5mm, the tail shank is easy to break, and the preform powder body is easy to fall into the furnace body, which will cause equipment damage.

[0068] The original process method is used for sintering, and the white mist length of the effective body part is 15mm. The process method of this application is used for sintering, and the downward moving distance of stage 4 is 30mm, the descending speed is 4.3mm / min, the rotation speed is 2rmp, and the temperature in the vitrification sintering zone is mainta...

Embodiment 3

[0084] Select the preformed rod powder body for sintering, and the density of the preformed rod powder body is 0.44g / cm 3 , The ideal diameter of the preformed rod powder after sintering is 126.38mm, the theoretical diameter range is 121.32-131.43mm, and the tail handle diameter is 35mm.

[0085] Set the early warning value of the diameter of the tail shank to 33.5mm, because when the diameter of the tail shank in the sintering furnace is less than 33.5mm, the tail shank is easy to break, and the preform powder body is easy to fall into the furnace body, which will cause equipment damage.

[0086] Sintered by the original process method, the length of the white mist of the effective body part is 53mm. The process method of the present application is used for sintering, and the downward moving distance of stage 4 is 50mm, the descending speed is 4.3mm / min, the rotation speed is 2rmp, and the temperature of the vitrification sintering zone is maintained at 1560°C in stage 3. Wh...

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Abstract

The invention provides a sintering method for preform rod powder of optical fiber. The sintering method solves the technical problems that an existing sintering method for the preform rod powder of the optical fiber is long in sintering time, and difficult to achieve good sintering permeability and high diameter uniformity at the same time. The preparation method comprises the following steps: stage 1, a heating stage: rotating the preform rod powder at the speed of 2rpm, and heating the preform rod powder to 1160-1165 DEG C in a dehydroxylation area; stage 2, a heating stage, starting to lower down the preform rod powder and rotating the preform rod powder at the speed of 1.5-2rpm, a descending speed ranging from 15mm / min to 25mm / min; and rising the temperature of a vitrification sintering area to 1530-1560 DEG C; stage 3, a constant-temperature heating stage, keeping a rotating speed of the preform rod powder at 1.5-2rmp, keeping the descending speed at 3.5-5mm / min; the temperature of the vitrification sintering area being kept at 1530-1560 DEG C; and stage 4, a constant-temperature heating stage, wherein the rotating speed of the preform rod powder is 2rmp, a downward moving distance is 20-50mm, and the descending speed is 3-5mm / min; and the vitrification sintering area maintains the temperature at the end of stage 3. The sintering method is widely applied to the technical field of sintering of optical fiber preform rod powder.

Description

technical field [0001] The invention relates to a sintering method, in particular to a sintering method of an optical fiber prefabricated rod powder body. Background technique [0002] At present, during the sintering process of the optical fiber preform powder body, the temperature of the sintering furnace is controlled by a temperature control system. The preformed rod powder is sintered at the set temperature and temperature change rate; the rod feeding speed is controlled by the control motor, and the rod feeding speed is preset before sintering. Each stage has a fixed speed, according to the preset Sintering of the preform powder body at a high speed. [0003] In the existing sintering process, after the sintering is completed, in order to ensure the transparency of the tail of the preform powder body, a dwell stage is set, that is, at the same position as the end of the previous stage, stop moving and rotate, and dwell for 1 hour. The advantage of this sintering proc...

Claims

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Application Information

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IPC IPC(8): C03B37/012
CPCC03B37/01282
Inventor 李伟于景明孙洋王盛伟曹景飞
Owner 威海长和光导科技有限公司
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