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Chemical vapor deposition preparation method for sapphire optical fiber BN total reflection coating

A chemical vapor deposition and sapphire technology, which is applied in the field of chemical vapor deposition preparation of sapphire optical fiber BN total reflection coating, can solve the problem of difficult control of sol solution concentration, viscosity and pulling speed, inability to guarantee film quality, cladding quality influence, etc. problem, to achieve the effect of protecting sapphire fiber, strong design and good uniformity

Inactive Publication Date: 2019-05-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, Hongmin Jiang et al. have prepared magnesium-aluminum spinel films on the surface of sapphire optical fibers by using the precursor conversion method. Studies have shown that the light transmission intensity is improved after coating, but the magnesium-aluminum spinel on the surface of sapphire is more than 1250 ℃. The film is unstable, and the droplets are obtained by manually coating with the tip of a brush, so the quality of the film cannot be guaranteed; A transparent polycrystalline alumina cladding is prepared on the surface of the optical fiber, and a transparent cladding that can withstand high temperature operation of 1600°C is obtained
However, it is difficult to control the concentration, viscosity and pulling speed of the sol solution during the pulling process, so it has a great influence on the cladding quality

Method used

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  • Chemical vapor deposition preparation method for sapphire optical fiber BN total reflection coating
  • Chemical vapor deposition preparation method for sapphire optical fiber BN total reflection coating
  • Chemical vapor deposition preparation method for sapphire optical fiber BN total reflection coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: ultrasonically clean the sapphire optical fiber sample in acetone, alcohol, and distilled water for 10 minutes respectively, and then dry it at room temperature.

[0042] Step 2: Arrange the dried optical fiber neatly overhead into a graphite frame of 150mm×100mm×60mm, and hang the graphite frame at the center of the isothermal zone in the deposition furnace;

[0043] Step 3: Vacuum the deposition furnace, and at the same time feed argon gas with a flow rate of 50-150ml / min, pump the hearth of the deposition furnace to the set vacuum degree of 0.5Pa, and then raise the temperature to the set temperature of 650°C;

[0044] Step 4: After the temperature stabilizes, introduce carrier gas H 2, the flow rate is 50~150ml / min; the gas source is BCl 3 and NH 3 , BCl 3 The gas flow rate is 50~100ml / min, NH 3 The gas flow rate is 50-100ml / min; the deposition time is 15h, and the atmosphere is BCl 3 -NH 3 -H 2 , get BN coating;

[0045] Step 5: After the deposition...

Embodiment 2

[0048] Step 1: ultrasonically clean the sapphire optical fiber sample in acetone, alcohol, and distilled water for 10 minutes respectively, and then dry it at room temperature.

[0049] Step 2: Arrange the dried optical fiber neatly overhead into a graphite frame of 150mm×100mm×60mm, and hang the graphite frame at the center of the isothermal zone in the deposition furnace;

[0050] Step 3: Vacuum the deposition furnace, and at the same time feed argon gas with a flow rate of 50-150ml / min, pump the hearth of the deposition furnace to the set vacuum degree of 0.5Pa, and then raise the temperature to the set temperature of 650°C;

[0051] Step 4: After the temperature stabilizes, introduce carrier gas H 2 , the flow rate is 50~150ml / min; the gas source is BCl 3 and NH 3 , BCl 3 The gas flow rate is 50~100ml / min, NH 3 The gas flow rate is 50-100ml / min; the deposition time is 30h, and the atmosphere is BCl 3 -NH 3 -H 2 , get BN coating;

[0052] Step 5: After the depositio...

Embodiment 3

[0055] Step 1: ultrasonically clean the sapphire optical fiber sample in acetone, alcohol, and distilled water for 10 minutes respectively, and then dry it at room temperature.

[0056] Step 2: Arrange the dried optical fiber neatly overhead into a graphite frame of 150mm×100mm×60mm, and hang the graphite frame at the center of the isothermal zone in the deposition furnace;

[0057] Step 3: Vacuum the deposition furnace, and at the same time feed argon gas with a flow rate of 50-150ml / min, pump the hearth of the deposition furnace to the set vacuum degree of 0.5Pa, and then raise the temperature to the set temperature of 650°C;

[0058] Step 4: After the temperature stabilizes, introduce carrier gas H 2 , the flow rate is 50~150ml / min; the gas source is BCl 3 and NH 3 , BCl 3 The gas flow rate is 50~100ml / min, NH 3 The gas flow rate is 50-100ml / min; the deposition time is 45h, and the atmosphere is BCl 3 -NH 3 -H 2 , get BN coating;

[0059] Step 5: After the depositio...

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Abstract

The invention relates to a chemical vapor deposition preparation method for a sapphire optical fiber BN total reflection coating. A BN coating is prepared from BCl3-NH3 serving as raw materials by using a chemical vapor deposition method; and a diluent gas, BCl3 and NH3 are introduced to a deposition furnace, and BCl3 and NH3 react in a hearth of the deposition furnace to deposit on the surface ofa sapphire optical fiber. The method disclosed by the invention is strong in designability, simple in process and good in repeatability. The BN coating prepared by using the preparation method is uniform and dense, and particularly, the BN coating is deposited on the surface of the sapphire optical fiber, so that the surface is smooth, the uniformity is good, the mechanical properties of the optical fiber can be greatly improved, the aim of protecting the sapphire optical fiber can be achieved, and the service life of the optical fiber can be prolonged. The chemical vapor deposition preparation method has the advantages that the prepared BN coating is uniform and dense, and particularly, the BN coating is deposited on the surface of the sapphire optical fiber, so that the surface is smooth, the uniformity is good, the mechanical properties of the optical fiber can be greatly improved, the aim of protecting the sapphire optical fiber can be achieved, and the service life of the opticalfiber can be prolonged; in addition, the chemical vapor deposition preparation method is simple in technical process and good in repeatability.

Description

technical field [0001] The invention belongs to the technical field of preparation of optical fiber surface coatings, and relates to a chemical vapor deposition preparation method of a sapphire optical fiber BN total reflection coating. Background technique [0002] Optical fiber sensing technology is a high-tech developed after the successful use of optical fiber in communication. It has many advantages, such as high precision, no electromagnetic interference, no electrical signal on site, and reliable performance. Optical fiber sensing technology is to measure various physical quantities by modulating the characteristic parameters representing light waves propagating in optical fibers. Sapphire single crystal fiber, as the sensing head of a high temperature sensor, needs to be exposed to harsh environments such as hot air flow and high temperature for a long time. The interaction between various working atmospheres and environmental material components and the surface of t...

Claims

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Application Information

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IPC IPC(8): C03C25/42C03C25/223
Inventor 栾新刚郁荣成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV