A carbon fiber surface hfzrb 2 The preparation method of -sibnc composite coating

Abstract

The invention discloses a carbon fiber surface HfZrB 2 ‑SiBNC composite coating preparation method, the method is a low-temperature precursor solution immersion cracking method, characterized in that, sequentially comprising: the preparation of coating liquid, carbon fiber surface activation treatment, coating, drying and heat treatment; antioxidative HfZrB 2 ‑SiBNC carbon fiber coating. The invention has the advantages of simple process, simple equipment and operating environment requirements, no need for special equipment, strong implementability, cheap raw materials, easy to obtain, easy to implement, energy saving and environmental protection, and can be made on the surface of carbon fibers with uniform density and good adhesion. The high-temperature and anti-oxidation coating within 2 μm not only retains the original mechanical properties of carbon fibers, improves the high-temperature anti-oxidation properties of carbon fibers, but also improves the interface between the fibers and the matrix.

Description

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

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Problems solved by technology

In 2014, Chinese invention patent CN 103757603 A 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 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

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