Silicon carbide coating and preparation method thereof

Abstract

The invention relates to a silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic functional coating materials. The preparation method of silicon carbide comprises the following steps: respectively preparing a first coating sizing agent and a second coating sizing agent, wherein the first coating sizing agent is prepared from phenolic resin, Si powder and SiC powder with a weight ratio of 3:(3 to 5):(0.5 to 1.5), and the second coating sizing agent is a silicified sizing agent; coating the surface of a carbon-containing material with the prepared first coating sizing agent, curing to obtain an inner coating layer, then coating the surface of the inner coating layer with the prepared silicified coating sizing agent, and curing to obtain an outer coating layer; performing high temperature vacuum sintering on the carbon-containing material on which the outer coating layer is formed, thus obtaining the silicon carbide coating. According to the silicon carbide coating provided by the embodiment of the invention, the inner coating layer and the outer coating layer can be formed by high temperature sintering for once, quick formation of the high-quality silicon carbide coating is realized, the preparation process is greatly simplified, and a preparation period is shortened by 50 percent or more; the method adapts to quick preparation of carbon-containing materials with different structures, different sizes and special shape and component coatings thereof.

Description

technical field [0001] The invention relates to a silicon carbide coating and a preparation method thereof, belonging to the field of inorganic functional coating materials. Background technique [0002] Anti-oxidation coating technology is the key to realize the service of carbon-containing materials (including carbon / carbon composite materials, graphite materials, carbon / silicon carbide composite materials, etc.) The coating can effectively block the contact between ambient oxygen and internal carbonaceous materials, thereby exerting the high-temperature performance of carbonaceous materials. [0003] There are many methods for preparing anti-oxidation coatings, including solid phase embedding method, brushing method, plasma spraying method, chemical vapor deposition method, coating and sintering method, etc. Among them, the coating and sintering method was developed in recent years and has different characteristics. The advantages of good substrate process adaptability, ...

AI Technical Summary

Problems solved by technology

[0004] When the silicon carbide coating is prepared by the coating and sintering method, it is necessary to repeat the coating and sintering process many times to achieve the continuity of the coating and reach a certain thickness requirement, and form an effective coating with good quality. The process is complicated and the preparation cycle is long. The corresponding preparation cost is also higher

In addition, due to the complex process, the prepared anti-oxidation coating is easily damaged during the process, which increases the cycle of further improvement of the coating.

Images