Preparation method for preparing surface SiC coating of silicon carbide-based composite material

A composite material and silicon carbide-based technology, which is applied in the field of preparation of SiC coating on the surface of composite materials, can solve the problems of narrow process window, large amount of melt volatilization, and difficult coating, so as to improve high temperature stability and density , the effect of high bonding strength
CN105948822AActive Publication Date: 2016-09-21AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
Publication Date
2016-09-21

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Abstract

The present invention relates to a preparation method for preparing the surface SiC coating of a silicon carbide-based composite material and belongs to the technical field of oxidation protection. According to the method, silicon powders are embedded in the surface of the silicon carbide-based composite material. After the high-temperature vacuum infiltration process, the composite material is embedded in a melt. After that, the composite material embedded in the melt is placed in an excess carbon source, and is subjected to the high-temperature heat treatment again. After residues on the surface of the composite material are removed, the composite material with the SiC coating can be obtained. According to the technical scheme of the invention, the coating is prepared through the reactive infiltration process. Therefore, during the preparation of the coating, the density of the base material can be further improved at the same time. the excess melt is removed by the carbon source, so that the formed SiC coating is uniform and smooth.
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Description

technical field

[0001] The invention relates to a method for preparing a SiC coating on the surface of a composite material, belonging to the technical field of oxidation protection. Background technique

[0002] SiC-based composite materials are usually used in high-temperature oxidizing environments, and SiC coatings are generally prepared on the surface of composite materials to improve the oxidation resistance of materials. Reactive infiltration is usually used as a method for densification of SiC-based composites, and it also has a positive effect on the oxidation resistance of the material. At high temperature, melts such as Si or Si-Zr alloys penetrate into the pores of the composite material through capillary force to increase the density of the composite material. Compounds such as SiC and ZrC formed by the reaction of the melt and carbon elements in the composite material have certain anti-oxidation functions.

[0003] In the prior art, methods for preparing SiC c...

Claims

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