Method for preparation of antioxidant composite coating on carbon fiber surface

A composite coating and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve problems such as cracks and peeling off of the coating, inconformity with energy conservation and environmental protection, and impact on oxidation resistance, etc., achieving shortened preparation time, Reduced equipment requirements and short aging time

Active Publication Date: 2015-12-02
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the existing sol-gel method requires heating and stirring, long-term high-temperature hydrolysis and aging when preparing sols, and there is a problem of high heat treatment temperature; It is to prepare a single-component sol first, and then mix the prepared single-component sol to obtain a multi-component sol. This sol preparation method not only requires high equipment, wastes energy, and takes a long time to prepare. It also requires high-temperature heat treatment. It will also cause damage to the carbon fiber and reduce the performance of the carbon fiber. At the same time, it does not meet the requirements of energy conservation and environmental protection. In particular, the prepared coating is prone to cracks and peeling off, which affects its oxidation resistance.

Method used

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  • Method for preparation of antioxidant composite coating on carbon fiber surface
  • Method for preparation of antioxidant composite coating on carbon fiber surface

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing an oxidation-resistant composite coating on a carbon fiber surface, comprising the steps of:

[0035] (1) Preparation of composite sol: the precursor ethyl orthosilicate (CAS#78-10-4), butyl titanate (CAS#5593-70-4), aluminum nitrate nonahydrate (CAS#7784-27 -2) prepare ternary composite sol according to Al:Si:Ti=1.5:4:0.5 (molar ratio), specifically:

[0036] a) Ethyl orthosilicate, acetic acid and distilled water were added to ethanol in sequence, and stirred at room temperature for 2 hours to obtain a mixed solution A, wherein: ethyl orthosilicate: ethanol: acetic acid: distilled water = 4:16:4: 11 (molar ratio); according to butyl titanate: ethanol = 1:8 (molar ratio), add butyl titanate to ethanol, stir at room temperature to mix them uniformly, and obtain an ethanol solution of butyl titanate; According to aluminum nitrate nonahydrate: ethanol=1:35 (molar ratio), join aluminum nitrate nonahydrate in ethanol, stir at room temperature to make...

Embodiment 2

[0046] The difference between this embodiment and Example 1 is only that: "Ultrasonic immersion for 90 minutes" in step (3) is replaced by "Ultrasonic immersion for 60 minutes", the rest of the content is the same as described in Example 1, and finally the surface coated with al 2 o 3 -SiO 2 -TiO 2 Carbon fiber with anti-oxidation composite coating, the thickness of the coating is about 0.55 μm; the prepared Al 2 o 3 -SiO 2 -TiO 2 Antioxidant composite coatings such as figure 1 Shown: Uniform and complete with good adhesion.

Embodiment 3

[0048] The difference between this example and Example 1 is that the "ultrasonic immersion for 90 minutes" in step (3) is replaced by "ultrasonic immersion for 60 minutes", and the carbon fiber is repeatedly coated and dried twice, and the step "Insulated at 750°C for 1 hour" in (4) was replaced with "insulated at 750°C for 1.5 hours", all the other contents were the same as those described in Example 1, and finally the surface was coated with Al 2 o 3 -SiO 2 -TiO 2 Carbon fiber with anti-oxidation composite coating, the thickness of the coating is about 1.17μm; the prepared Al 2 o 3 -SiO 2 -TiO 2 Antioxidant composite coatings such as figure 1 Shown: Uniform and complete with good adhesion.

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Abstract

The invention relates to a method for preparation of an antioxidant composite coating on a carbon fiber surface. The antioxidant composite coating is an Al2O3-SiO2-TiO2 composite coating. The method is sol-gel method, which includes: composite sol preparation, carbon fiber surface activation treatment, coating, drying and heat treatment. The composite sol is prepared under room temperature, and the preparation process includes: firstly preparing a water-alcohol solution of tetraethyl orthosilicate and acetic acid into a mixed solution A, then pouring the mixed solution A into an alcohol solution of butyl titanate to prepare a mixed solution B, then under stirring, pouring an alcohol solution of aluminum nitrate nonahydrate into the mixed solution B to prepare a mixed solution C, finally adding an alcohol-water mixed solvent into the mixed solution C, and performing stirring to obtain the composite sol. With the ternary composite sol prepared by the method provided by the invention, a uniform and complete antioxidant coating with good adhesion and thickness within 3 micrometers can be prepared on the carbon fiber surface.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation composite coating on the surface of carbon fibers, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Carbon fiber (CF for short) is a new fiber material with high strength and high modulus with a carbon content of more than 95%. Carbon fiber has many excellent properties, such as: high axial strength and modulus, low density, high specific performance, no creep, 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. These characteristics make carbon fiber widely used in composite materials based on materials such as ceramics, resins, metals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M11/45D06M11/46D06M11/64D06M101/40
Inventor 王静静林文松闫学增
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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