Carbon fiber surface anti-oxidation coating preparation method

An anti-oxidation coating and carbon fiber technology, applied in the field of materials, can solve problems such as poor anti-oxidation performance, achieve the effect of low diffusion rate and improve anti-oxidation performance

Inactive Publication Date: 2018-02-16
六安成邦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing an anti-oxidation coating on the surface of carbon fibers to solve the problem of poor oxidation resistance of carbon fiber coatings prepared by polycarbosilane cracking in the prior art

Method used

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Embodiment 1

[0015] The embodiment of the present invention provides a method for preparing an anti-oxidation coating on a carbon fiber surface, comprising the following steps:

[0016] 1) adding polycarbosilane to xylene, stirring and dissolving to prepare a precursor solution, wherein the mass fraction of polycarbosilane is 5%;

[0017] 2) Immerse the carbon fiber in the precursor solution obtained in Step 1) Step 1, and then perform curing treatment at 185°C for 2 hours to obtain a preform;

[0018] 3) The prefabricated body obtained in step 2) is immersed in a xylene solution dissolved with ethyl orthosilicate and boric acid for immersion treatment, and then cured at 150° C. for 1 hour, wherein the mass fraction of ethyl orthosilicate is 5%, The massfraction of boric acid is 1%;

[0019] 4) The preform obtained in step 3) is pyrolyzed, the pyrolysis temperature is 1250° C., the pyrolysis environment is inert gas, and the holding time is 2.5 hours.

[0020] The oxidation initiation te...

Embodiment 2

[0022] The embodiment of the present invention provides a method for preparing an anti-oxidation coating on a carbon fiber surface, comprising the following steps:

[0023] 1) adding polycarbosilane into xylene, stirring and dissolving to prepare a precursor solution, wherein the mass fraction of polycarbosilane is 15%;

[0024] 2) Immerse the carbon fiber in the precursor solution obtained in Step 1) Step 1, and then perform curing treatment at 185°C for 2 hours to obtain a preform;

[0025] 3) The prefabricated body obtained in step 2) is immersed in a xylene solution dissolved with ethyl orthosilicate and boric acid for immersion treatment, and then cured at 150° C. for 1 hour, wherein the mass fraction of ethyl orthosilicate is 10%, The massfraction of boric acid is 5%;

[0026] 4) The prefabricated body obtained in step 3) is pyrolyzed, the pyrolysis temperature is 1450° C., the pyrolysis environment is inert gas, and the holding time is 2.5 hours.

[0027] The oxidatio...

Embodiment 3

[0029] The embodiment of the present invention provides a method for preparing an anti-oxidation coating on a carbon fiber surface, comprising the following steps:

[0030] 1) adding polycarbosilane to xylene, stirring and dissolving to prepare a precursor solution, wherein the mass fraction of polycarbosilane is 12%;

[0031] 2) Immerse the carbon fiber in the precursor solution obtained in Step 1) Step 1, and then perform curing treatment at 185°C for 2 hours to obtain a preform;

[0032] 3) The prefabricated body obtained in step 2) is placed in a xylene solution dissolved with ethyl orthosilicate and boric acid for immersion treatment, and then cured at 150° C. for 1 hour, wherein the mass fraction of ethyl orthosilicate is 7%, The massfraction of boric acid is 2%;

[0033] 4) The preform obtained in step 3) is pyrolyzed, the pyrolysis temperature is 1350° C., the pyrolysis environment is vacuum, and the holding time is 2.5 hours.

[0034] The oxidation initiation temper...

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Abstract

The invention relates to a method for preparing an anti-oxidation coating on the surface of carbon fibers, comprising the following steps: 1) adding polycarbosilane to xylene, stirring and dissolving to prepare a precursor solution; 2) placing carbon fibers in the precursor obtained in step 1) step 1 immersion in the body solution, followed by curing treatment at 185 ° C for 2 hours to obtain a preform; 3) the preform obtained in step 2) was placed in a xylene solution dissolved in tetraethyl orthosilicate and boric acid for immersion treatment, and then at 150 ℃ curing treatment for 1 hour; 4) pyrolyzing the preform obtained in step 3). This method prepares silicon carbide / titanium oxide + boron oxide coating on the surface of carbon fiber. During the cracking process, titanium oxide and boron oxide fill the cracks and gaps of silicon carbide. At the same time, the diffusion rate of oxygen in titanium oxide and boron oxide is very low, which greatly improves oxidation resistance of carbon fibers.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing an anti-oxidation coating on the surface of carbon fibers. Background technique [0002] Carbon fiber has many excellent properties, such as high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and Between metals, the thermal expansion coefficient is small and has anisotropy, good corrosion resistance, good X-ray permeability, good electrical and thermal conductivity, and good electromagnetic shielding. However, the oxidation resistance of carbon fiber is poor, so it is of great significance to prepare a coated carbon fiber with excellent oxidation resistance. [0003] In the prior art, the preparation methods of carbon fiber surface coating mainly include chemical vapor deposition method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/77D06M11/46D06M11/82D06M101/40
CPCD06M11/77D06M11/46D06M11/82D06M2101/40
Inventor 魏健刘伟刘杰薛倩江昊
Owner 六安成邦新材料有限公司
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