Silicon carbide fiber provided with SiBCN coating deposited on surface and preparation method of silicon carbide fiber

Abstract

The invention discloses silicon carbide fiber provided with a SiBCN coating deposited on the surface. The silicon carbide fiber comprises a silicon carbide fiber matrix and the SiBCN coating deposited on the matrix, wherein the SiBCN coating and the silicon carbide fiber matrix are combined through a mechanical meshing or chemical bonding mode, and the SiBCN coating is prepared from raw materials including borazine and liquid polycarbosilane with a CVD (chemical vapor deposition) process. A specific preparation method of the silicon carbide fiber comprises the following steps: a silicon carbide fiber matrix material is subjected to ultrasonic cleaning firstly, pretreated at high temperature and placed in a depositing furnace; air in the depositing furnace is replaced; preheating is performed under set vacuum at set temperature; carrier gas and diluent gas are introduced, borazine and liquid polycarbosilane are carried into a hearth of the depositing furnace by the carrier gas; and the SiBCN coating is formed on the surface of the silicon carbide fiber matrix material after a period of time. A product has uniform and compact coating, good high-temperature stability and good technical property, and the antioxidant ability of the silicon carbide fiber can be improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite material and its preparation, and in particular relates to a silicon carbide fiber with deposited coating on its surface and a preparation method thereof. Background technique [0002] SiC fiber is a polycrystalline ceramic fiber with high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and chemical corrosion resistance. It can be used as a high-performance composite phase for polymer-based, metal-based and ceramic-based composite materials. SiC enhanced by f / SiC high-performance ceramic matrix composites can be used in cutting-edge fields such as space shuttles and high-performance engines, and are known as new materials for aviation, aerospace and high-tech applications in the 21st century. SiC f The performance of the / SiC composite material not only depends on the properties of the SiC fiber and the SiC matrix itself, but more im...

AI Technical Summary

Problems solved by technology

However, in the preparation of the above-mentioned SiBCN coating, the deposition gas source of the second type or above is used, the process is relatively complicated, and most of the deposition reaction process produces corrosive by-products, which have no impact on the deposition substrate material and equipment, and Not suitable for industrial production of SiBCN

Images