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Method for generating silicon carbide coating on surface of carbon fiber

A technology of silicon carbide coating and carbon fiber, which is applied in the fields of carbon fiber, fiber treatment, textile and paper making, can solve the problems of cost increase and achieve the effect of simple equipment

Inactive Publication Date: 2009-10-21
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original method of preparing SiC coating on the surface of carbon fiber requires special equipment PECVD or LPCVD and precursor gas (chlorosilane or polycarbosilane), resulting in increased cost

Method used

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  • Method for generating silicon carbide coating on surface of carbon fiber
  • Method for generating silicon carbide coating on surface of carbon fiber
  • Method for generating silicon carbide coating on surface of carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The invention adopts a simple method of thermally evaporating silicon melt to synthesize SiC coating on the surface of polyacrylonitrile carbon fiber. Put the silicon powder into the bottom of the graphite crucible, and place the polyacrylonitrile carbon fiber horizontally on the top of the crucible. In order to increase the contact between the polyacrylonitrile carbon fiber and the silicon vapor and fix the polyacrylonitrile carbon fiber as much as possible, turn the crucible of the same size upside down On the crucible of polyacrylonitrile carbon fiber, keep certain distance between silicon powder and polyacrylonitrile carbon fiber. Put this device into a high-temperature vacuum sintering furnace, pre-evacuate to 1Pa with a mechanical pump, then fill it with argon protective gas, and then use a mechanical pump and a diffusion pump to evacuate to a vacuum degree of 1×10 -4 Pa, then filled with argon protective gas again, and shut off the argon source. Then heat up to ...

Embodiment 2

[0014] The invention adopts a simple method of thermally evaporating silicon melt to synthesize SiC coating on the surface of polyacrylonitrile carbon fiber. Put the pieces of silicon block into the bottom of the graphite crucible, and place the polyacrylonitrile carbon fiber horizontally on the top of the crucible. In order to increase the contact between the polyacrylonitrile carbon fiber and the silicon vapor and fix the polyacrylonitrile carbon fiber as much as possible, turn the crucible of the same size upside down and place it on a shelf. On the crucible filled with polyacrylonitrile carbon fiber, a certain distance is always maintained between the silicon block fragments and the polyacrylonitrile carbon fiber. Put this device into a high-temperature vacuum sintering furnace, pre-evacuate the mechanical pump to 3Pa, then fill it with argon protective gas, and then use the mechanical pump and diffusion pump to evacuate to a different vacuum degree of 1×10 -2 Pa, then fil...

Embodiment 3

[0016] The invention adopts a simple method of thermally evaporating silicon melt to synthesize SiC coating on the surface of polyacrylonitrile carbon fiber. Put the silicon powder into the bottom of the graphite crucible, and place the polyacrylonitrile carbon fiber horizontally on the top of the crucible. In order to increase the contact between the polyacrylonitrile carbon fiber and the silicon vapor and fix the polyacrylonitrile carbon fiber as much as possible, turn the crucible of the same size upside down On the polyacrylonitrile carbon fiber crucible, a certain distance is always kept between the silicon powder and the polyacrylonitrile carbon fiber. Put this device into a high-temperature vacuum sintering furnace, pre-evacuate the mechanical pump to 5Pa, then fill it with argon protective gas, and then use the mechanical pump and diffusion pump to pump to a different vacuum degree of 1×10 -3 Pa, then filled with argon protective gas again, and shut off the argon sourc...

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Abstract

The invention discloses a method for generating a silicon carbide coating on the surface of a carbon fiber. The method is used to synthesize the SiC coating on the surface of a polyacrylonitrile carbon fiber. The method comprises the following steps: placing silicon powder or fragments of silicon briquets into the bottom of a graphite crucible, and placing the carbon fiber horizontally on the top of the crucible; inversely placing a crucible with the same size on the crucible in which the carbon fiber is placed in order to increase the contact between the carbon fiber and silicon vapor as much as possible and fix the carbon fiber, and always keeping a distance between the fragments of the silicone briquets and the carbon fiber; placing the device into a high temperature vacuum sintering furnace, carrying out forvacuum pumping to 1 to 5 Pa by a mechanical pump, then charging shielding gas argon, carrying out vacuum pumping again to 10 to 10 Pa by the mechanical pump and a diffusion pump, then charging the shielding gas argon again, and turning off an argon source; and then raising the temperature above the melting point of silicon, holding the temperature for 1 to 9 hours, turning off power supply, and taking out the fiber after cooling down to find the silicone carbide coating generated on the surface of the fiber. The method has a series of advantages of simple device, no precursor gas such as chlorosilane or polycarbosilane needed, no hydrogen needed, and the like.

Description

technical field [0001] The invention relates to a method for forming a silicon carbide coating on the surface of a carbon fiber. Background technique [0002] Carbon fiber is a material with high specific strength and high specific modulus fired in an inert atmosphere, but it has strong oxidation sensitivity at high temperature, which limits its application in aviation, aerospace, military and other fields. Coating anti-oxidation coating on the surface of carbon fiber can improve the high temperature oxidation resistance of carbon fiber. SiC material has the characteristics of low density, refractory, low thermal expansion coefficient and excellent oxidation resistance. Coating SiC on the surface of carbon fiber can not only solve the oxidation resistance of carbon fiber, inhibit interface reaction, but also ensure good composite effect with light metals such as Al and Mg. , making it the material of choice for anti-oxidation coatings. At home and abroad, trichloromethylsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/77D06M101/40
Inventor 陈建军王耐艳高林辉杜平凡金达莱
Owner ZHEJIANG SCI-TECH UNIV
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