Preparation method of ZrB2-SiBNC composite coating on carbon fiber surface

Abstract

The invention discloses a preparation method of a ZrB2-SiBNC composite coating on the carbon fiber surface. The preparation method is a low-temperature precursor solution infiltration and pyrolysis method and is characterized by comprising the steps of preparation of a coating solution, activating treatment for the carbon fiber surface, coating, drying and thermal treatment in sequence; the ZrB2-SiBNC carbon fiber coating with resistance to the high temperature and oxidization is obtained. The method is simple in process, the requirements for equipment and the operation environment are simple,special equipment is not needed, and high implementation performance is achieved; the raw materials are low in price and easy to obtain, easy operation is achieved, energy conservation and environment protection are achieved, and the uniform compact high-adhesion-force coating with the thickness within 2 microns resisting the high temperature and oxidization can be prepared on the carbon fiber surface; the original mechanical properties of a carbon fiber are kept, the high-temperature oxidization resistance performance of the carbon fiber is improved, and the problem existing on an interfacebetween the fiber and a substrate is further solved.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a carbon fiber surface ZrB 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...

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Problems solved by technology

In 2014, Chinese invention patent CN 103757603A disclosed a preparation method of zirconium diboride coating, which is based on ZrCl 4 、BCl 3 and H 2 As source gas, Ar gas or N 2 As a carrier gas and protective gas, zirconium diboride coating is prepared by chemical vapor deposition method. The preparation process is complicated, the conditions are harsh, the temperature is high, the energy consumption is high, special equipment is required, and it is not suitable for uniform coating on the surface of multi-dimensional fibers.

In 2015, Chinese invention patent CN 105331921A disclosed a spraying powder, thermal spraying in-situ synthesis of zirconium boride-zirconium carbide based ceramic coating and its preparation method, which is based on aluminum powder, zirconium hydride powder and boron carbide powder According to a certain ratio of raw materials, zirconium boride composite coatings are synthesized in situ by thermal spraying. The preparation method of zirconium boride composite coatings mainly involves the plating of borides on metals, ceramics and other base materials, and is not suitable for Fabrication of Dense Interfacial Phase Coatings on Fiber Surfaces

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

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