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Method for rapidly obtaining carbon/silicon carbide coaxial fiber by reducing plasma based on microwave and application

A technology of silicon carbide and carbon fiber, which is applied in the fields of carbon fiber, fiber processing, textiles and papermaking, etc., can solve problems such as inferiority and carbon fiber diameter is too small, and achieve high efficiency, low raw material cost and fast speed

Active Publication Date: 2015-04-22
ZHANGJIAGANG DONGDA IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the surface layer of the coaxial fiber is silicon dioxide (SiO 2 ), the modification effect of the high-temperature oxidation resistance of carbon fiber is obviously not as good as that of the SiC protective shell; and the carbon fiber diameter of this method is too small, so it can only be applied to fields such as wave absorption

Method used

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  • Method for rapidly obtaining carbon/silicon carbide coaxial fiber by reducing plasma based on microwave and application
  • Method for rapidly obtaining carbon/silicon carbide coaxial fiber by reducing plasma based on microwave and application
  • Method for rapidly obtaining carbon/silicon carbide coaxial fiber by reducing plasma based on microwave and application

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Effect test

Embodiment 5

[0094] Carbon fiber and silicon powder (Si) and silicon dioxide powder (SiO2) are grown in the vapor phase 2 ) as the raw material. Carbon fiber and silicon source are pressed carbon / silicon element mol ratio C:Si=5:1, the mol ratio Si of silicon / silicon dioxide in the silicon source:SiO 2 = 2:1 ratio of ingredients, mixed and placed in the resonant cavity of the microwave oven. First vacuumize to about 25KPa, then apply 5.5kW microwave, the sample temperature rises rapidly to about 1245°C. After 10 seconds of continuous irradiation, the C / SiC coaxial fiber is obtained.

[0095] Tests on the high-temperature thermal oxidation characteristics of C / SiC coaxial fibers show that the initial oxidation temperature is about 781°C; the thermal weight loss of fibers in the range of 810-915°C changes relatively quickly, but still has obvious protection for the carbon fiber core. Effect. Continuous thermal oxidation at a high temperature above 1105-1436 °C degrades the protection abi...

Embodiment 6

[0098] T800 type polyacrylonitrile (PAN) based carbon fiber and silicon powder (Si) and silicon dioxide powder (SiO 2 ) as the raw material. Carbon fiber and silicon source are pressed carbon / silicon element mol ratio C:Si=4:1, the mol ratio Si:SiO of silicon / silicon dioxide in the silicon source 2 = 1:1 ratio of ingredients, mixed and placed in the resonant cavity of the microwave oven. First vacuumize to about 30Pa, then apply 3.5kW microwave, the sample temperature rises rapidly to about 1190℃. After 40 seconds of continuous irradiation, the C / SiC coaxial fiber is obtained.

[0099] Tests on the high-temperature thermal oxidation characteristics of C / SiC coaxial fibers showed that the initial oxidation temperature increased to 781°C, and the weight increased slightly; the rapid thermal weight loss temperature range was delayed to 827-945°C; High temperature continuous thermal oxidation, relative to the oxidation of carbon fiber, the residual rate of coaxial fiber is abou...

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Abstract

The invention discloses a carbon / silicon carbide coaxial fiber which is prepared according to the following steps: fully mixing carbon fibers, silicon powder and silicon dioxide powder to obtain a mixture; arranging in vacuum or at a normal-pressure protection condition of an inertia gas; and heating the mixture by microwave to activate the surfaces of the carbon fibers and trigger a high-temperature reaction to obtain the carbon / silicon carbide coaxial fiber. The preparation method can be used for simply, conveniently, rapidly and efficiently preparing the C / SiC coaxial fiber which is ideal in structure and excellent in oxidation resistance. The C / SiC coaxial fiber is uniform, pure, free of impurities and controllable in shape. Besides, by adopting a technology in which the microwave is used for inducing plasma radiation, the preparation method has the advantages of high heating speed, uniform heating, small thermal inertia, short production period and the like, and the preparation cost is further lowered.

Description

technical field [0001] The invention relates to the field of a rapid synthesis method of coaxial fibers, in particular to a method and application for rapidly obtaining carbon / silicon carbide (C / SiC) coaxial fibers based on microwave-induced plasma. Background technique [0002] Carbon fiber is a typical representative of reinforcements in advanced composite materials. Due to its excellent high-temperature thermophysical properties, especially the unique property that the strength increases with the increase of service temperature, it is widely used in high-tech fields such as aerospace and nuclear industry. irreplaceable status. However, carbon fiber is easy to deteriorate and fail in a high-temperature oxidizing atmosphere, which has become a fatal limitation that plagues the high-temperature application of carbon fiber. In order to improve the high-temperature oxidation resistance of carbon fiber and its reinforced composite materials, people have to develop various meth...

Claims

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Application Information

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IPC IPC(8): D06M11/77C01B31/36D06M101/40
Inventor 王继刚赵甜甜黄珊
Owner ZHANGJIAGANG DONGDA IND TECH RES INST
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