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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 present invention relates to a carbon fiber surface anti-oxidation coating preparation method, which comprises: 1) adding polycarbosilane into xylene, and stirring and dissolving to prepare a precursor solution; 2) placing carbon fiber into the precursor solution obtained in the step 1), impregnating, and carrying out curing treatment for 2 h at a temperature of 185 DEG C to obtain a preform;3) placing the preform obtained in the step 2) into a xylene solution with dissolved tetraethyl orthosilicate and dissolved boric acid, impregnating, and carrying out curing treatment for 1 h at a temperature of 150 DEG C; and 4) carrying out high temperature cracking on the preform obtained in the step 3). According to the present invention, the silicon carbide / titanium oxide and boron oxide coating is prepared on the surface of the carbon fiber, wherein the crack gap of the silicon carbide is filled with the titanium oxide and the boron oxide during the cracking while the diffusion rate of oxygen in the titanium oxide and the boron oxide is extremely low so as to substantially improve the anti-oxidation performance of the carbon fiber.

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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