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A kind of sintering method of optical fiber preform powder

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: 2022-07-01
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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  • A kind of sintering method of optical fiber preform powder
  • A kind of sintering method of optical fiber preform powder
  • A kind of sintering method of optical fiber preform powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0054] Sintering by the original process method, the length of the white mist of the effective body part is 8mm. Using the process method of the present application for sintering, 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 and sintering zone is maintained at the temperature of stage 3 at 1530°C. When it moves down...

Embodiment 2

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

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

[0068] Sintering by the original process method, the length of the white mist of the effective body part is 15mm. Sintering by the process method of the present application, 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 of the vitrification and sintering zone is kept at 1545°C at the temperature of 3. When movin...

Embodiment 3

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

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

[0086] Sintering 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 and sintering zone is maintained at the temperature of stage 3 at 1560°C. When it mov...

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Abstract

The invention provides a sintering method for optical fiber preform powder, which solves the technical problems of long sintering time and difficulty in sintering permeability and diameter unevenness of the existing optical fiber preform powder sintering method; including: 1: Heating stage, the preform powder rotates at a speed of 2 rpm, and the dehydroxylation zone is heated to 1160-1165°C; Stage 2: Heating stage, the preform powder begins to descend and rotates at a speed of 1.5-2 rpm, and the descending speed is 15 ‑25mm / min; the temperature of the vitrification and sintering zone is raised to 1530‑1560℃; Stage 3: constant temperature heating stage, the rotation speed of the preform powder body is kept at 1.5‑2rmp, and the descending speed is kept at 3.5‑5mm / min; the temperature in the vitrification and sintering zone is kept At 1530‑1560℃; Stage 4: constant temperature heating stage, the rotation speed of the preform powder is 2rmp, the downward moving distance is 20‑50mm, and the descending speed is 3‑5mm / min; temperature. The invention is widely used in the technical field of optical fiber preform powder body sintering.

Description

technical field [0001] The invention relates to a sintering method, in particular to a sintering method of an optical fiber preform powder. Background technique [0002] At present, during the sintering process of the optical fiber preform powder, the temperature of the sintering furnace is controlled by the temperature control system. The sintering temperature is set in stages before sintering. Each stage has a constant temperature or temperature change rate. The preform powder is sintered at the set temperature and temperature change rate; the feeding speed is controlled by the control motor, and the feeding speed is preset before sintering. Each stage has a fixed speed, according to the preset speed. The sintering speed of the preform powder body is carried out. [0003] In the existing sintering process, after the sintering is completed, in order to ensure the permeability of the tail of the preform powder, a dwell stage is set, that is, at the same position as the prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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