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Preparation method of HfB2-SiBNC composite coating on surface of carbon fiber

A composite coating and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems that are not suitable for the preparation of dense interfacial phase coating on the fiber surface, it is difficult to industrialize production, and increase the risk, so as to avoid Side Effects, Ease of Access, Time Saving Effects

Inactive Publication Date: 2019-11-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2017, the Chinese invention patent CN 107523778 A disclosed the preparation method of hafnium boride composite coating, which uses hafnium oxide / boron carbide / aluminum composite powder as raw material according to a certain ratio, and uses thermal spraying in situ reaction to synthesize boron Hafnium compound coating mainly involves the plating of boride on metal, ceramic and other base materials, and is not suitable for preparing dense interfacial phase coating on the fiber surface
To prepare SiBNC by CVD process, it is necessary to find a suitable SiBNC precursor. The conditions are harsh, special equipment is required, the cost is expensive, and the operation is complicated. It is difficult to realize industrial production, and the reactants of this method are mostly toxic gases. greatly increased the risk

Method used

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  • Preparation method of HfB2-SiBNC composite coating on surface of carbon fiber
  • Preparation method of HfB2-SiBNC composite coating on surface of carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A carbon fiber surface HfB 2 -The preparation method of SiBNC composite coating, it comprises the following steps:

[0041] Use polyvinyl alcohol and deionized water as solvents, and prepare a polyvinyl alcohol solution with a concentration of 1mol / L under the condition of heating and stirring at 85°C; dissolve boric acid in deionized water and prepare a concentration of It is a boric acid solution of 0.6mol / L; the raw material of the hafnium oxychloride octahydrate precursor is fully dissolved in deionized water, and ammonia water is added dropwise to the above solution while stirring at room temperature to form a white flocculent precipitate (pH=9.5), and the above The white precipitate was washed 4 times by centrifugation with deionized water, and then the white precipitate was dissolved in nitric acid (pH=1.5) to obtain a hafnium oxide sol with a hafnium ion concentration of 0.5 mol / L; according to the volume fraction, 33.97 parts of ethanol was added to 16.19 Part...

Embodiment 2

[0043] Submerge the carbon fiber in the coating solution and ultrasonically immerse it for 50 minutes to obtain the coated carbon fiber. The rest of the process steps and conditions are the same as in Example 1.

[0044] Obtain coated with HfB through the above steps 2 -SiBNC-coated carbon fibers, the thickness of the coating is about 0.81 μm.

Embodiment 3

[0046] The treated carbon fiber was immersed in the coating solution, and ultrasonically immersed for 100 minutes to obtain the coated carbon fiber. The rest of the process steps and process conditions were the same as in Example 1.

[0047] Obtain coated with HfB through the above steps 2 -SiBNC-coated carbon fiber, the thickness of the coating is about 1.68 μm.

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Abstract

The invention discloses a preparation method of HfB2-SiBNC composite coating on the surface of carbon fiber. The method is a low-temperature precursor solution impregnation and pyrolysis. The method is characterized by sequentially including preparation of a coating solution, carbon fiber surface activation treatment, coating, drying and heat treatment, and through the method, the high-temperature-resistant and oxidation-resistant HfB2-SiBNC carbon fiber coating is obtained. The process is simple, the requirements of equipment and an operation environment are simple, no special equipment is needed, the feasibility is high, raw materials are cheap and easy to obtain, the method is easy to achieve, saves energy and is environmentally friendly, the high-temperature-resistant and anti-oxidation coating which is uniform, dense and good in adhesion and has the thickness within 2 micrometers can be prepared on the surface of the carbon fiber, the original mechanical properties of the carbon fiber are retained, the high temperature oxidation resistance of the carbon fiber is improved, and the interfacial compatibility between the fiber and a matrix is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a carbon fiber surface HfB 2 -Preparation method of SiBNC composite coating. Background technique [0002] Carbon fiber has excellent properties such as high modulus, high strength, low density, low thermal expansion, high temperature resistance, oxidation resistance, no creep, high thermal conductivity, and corrosion resistance. It can be used as a reinforcement for composite materials, making carbon fiber in ceramics, resins, It is widely used in composite materials with metal, carbon and other materials as the matrix. However, carbon fiber has been oxidized in the air above 400°C, and its oxidation resistance is poor, resulting in a decrease in the performance of the material. Moreover, the carbon fiber without surface treatment has low surface activity, poor wettability with some substrates, and poor bonding ability. Poor, it will also lead to a dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/80D06M101/40
CPCD06M11/80D06M2101/40
Inventor 王钺陈燕云杨建铃周俊霖陆薪宇何海静
Owner SOUTHWEST PETROLEUM UNIV