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Preparing method of high purity quartz sleeve for large-size optical fiber preform

An optical fiber preform, quartz sleeve technology, applied in glass manufacturing equipment, manufacturing tools, glass molding and other directions, can solve the problems of inability to effectively increase the size of powder rods, radial density cracking or fracture, etc., to ensure density consistency , the effect of improving resilience and wide application prospects

Active Publication Date: 2016-02-17
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through practical application, it is found that this method cannot effectively increase the size of the powder rod. When the outer diameter of the powder rod increases, the parallel part of the rod body is prone to cracking or fracture due to uneven radial density.

Method used

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  • Preparing method of high purity quartz sleeve for large-size optical fiber preform
  • Preparing method of high purity quartz sleeve for large-size optical fiber preform
  • Preparing method of high purity quartz sleeve for large-size optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Manufacturing a Φ300mm×2000mm optical fiber preform with a quartz sleeve

[0040] (1) The target rod made of quartz glass is pickled, soaked in hydrochloric acid with a concentration of 5% for 1 hour to remove impurities attached to the surface of the target rod, then rinsed repeatedly with deionized water, and finally dried.

[0041] (2) Place the pretreated target rod vertically in the upper and lower chucks of the deposition machine, adjust the position and lock it, and rotate the target rod at 20rpm. Decamethylcyclopentasiloxane, oxygen, hydrogen, and nitrogen are used as raw material gases to feed the blowtorch, and the flow rates are 20g / min, 20L / min, 40L / min, and 10L / min to ignite the blowtorch gas. Choose one blowtorch made of quartz material for each group, and the three groups of blowtorches longitudinally deposit back and forth in the corresponding E, M, and S ranges. The axial travel speed of the blowtorch is 100mm / min, and the pressure in the rea...

Embodiment 2

[0044] Example 2: Manufacture of a quartz sleeve for an optical fiber preform of Φ300mm×2500mm

[0045] (1) The target tube made of quartz glass is pickled, soaked in 10% nitric acid for 1.5 hours to remove impurities attached to the surface of the target tube, then rinsed repeatedly with deionized water, and finally dried.

[0046] (2) Place the pretreated target tube vertically in the upper and lower chucks of the deposition machine, adjust the position and lock it, and rotate the target rod at 35rpm. Use octamethylcyclotetrasiloxane, oxygen, natural gas, and nitrogen as raw material gases to feed the blowtorch, and the flow rates are 20g / min, 40L / min, 70L / min, and 15L / min to ignite the blowtorch gas. Choose one metal blowtorch for each group, 3 groups of blowtorches are longitudinally deposited back and forth in the corresponding E, M, S ranges, the axial travel speed of the blowtorch is 200mm / min, and the pressure in the reaction chamber is maintained at -40pa. During the...

Embodiment 3

[0049] Example 3: Manufacture of a quartz sleeve for an optical fiber preform of Φ360mm×2500mm

[0050] (1) The target tube made of quartz glass is pickled, soaked in sulfuric acid with a concentration of 15% for 2 hours to remove impurities attached to the surface of the target tube, then rinsed repeatedly with deionized water, and finally dried.

[0051] (2) Place the pretreated target tube vertically in the upper and lower chucks of the deposition machine, adjust the position and lock it, and rotate the target rod at 50rpm. Hexamethylcyclotrisiloxane, oxygen, methane, and nitrogen are used as raw material gases to pass into the torch, and the flow rates are 20g / min, 60L / min, 100L / min, and 20L / min to ignite the torch gas. Each group of 2 metal blowtorches is selected, and the 3 groups of blowtorches are longitudinally deposited back and forth in the corresponding E, M, and S ranges. The axial travel speed of the blowtorches is 300mm / min, and the pressure in the reaction cham...

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Abstract

The invention relates to a preparing method of a high purity quartz sleeve for a large-size optical fiber preform. The method comprises the steps of firstly, clamping a target rod or tube subjected to acid washing and drying on upper and lower chucks of an upright deposition device; adopting an upright sectional vapor deposition method, and introducing siloxane, oxygen, natural gas or methane or hydrogen gas, nitrogen gas as a raw material into a blowtorch, wherein after igniting, high temperature flame reacts to generate silicon dioxide powder with the particle size between 5-200nm, the powder is attached to the surface of the target rod or tube and finally achieves the set target rod size; then placing the silicon dioxide powder rod obtained by depositing into a graphite resistance furnace with the temperature being 1200-1600 DEG C, and introducing Cl2 and He with a flow ratio being (1-5) to (1-20) for vitrification sintering, thus obtaining a quartz sleeve preformed unit; performing mechanical cold machining on the quartz sleeve preformed unit to obtain the quartz sleeve; then adopting a weak base solution to wash, then repeatedly washing with deionized water, soaking with acid and finally washing with the deionized water and drying.

Description

technical field [0001] The invention relates to a method for preparing a high-purity quartz sleeve for a large-scale optical fiber preform. Background technique [0002] At present, in order to achieve full-wave transmission of optical fibers, the content of metal impurities and hydroxyl groups in optical fiber preforms should be as small as possible to avoid attenuation loss caused by metal impurities and hydroxyl groups, thereby meeting the market demand for low-loss optical fibers. At the same time, the competition in today's optical fiber preform market is becoming increasingly fierce. In order to further reduce production costs, larger-sized quartz sleeves are used to prepare large-size optical fiber preforms to improve production efficiency. Usually, a vapor deposition synthesis method is used to manufacture the quartz sleeve for the optical fiber preform, that is, the flame hydrolysis method SiCl 4 +2H 2 +O 2 → SiO 2 +4HCl. This method can obtain high-purity quar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018C03B20/00
CPCY02P40/57
Inventor 吴椿烽沈一春钱宜刚
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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