Double-layer Si-Zr self-reaction coating and preparation method thereof

By preparing a double-layer Si-Zr self-reactive coating on the surface of C/C composite material, the outer SiC layer is oxidized to generate SiO2 and the inner layer reacts to form a ZrB2-SiC coating, which solves the problem of insufficient oxidation resistance of C/C composite material at high temperature and achieves low oxidation rate and high structural stability in a wide temperature range.

CN121800541APending Publication Date: 2026-04-07XIAN AEROSPACE COMPOSITE MATERIALS INST
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Patent Information

Application Number
CN202511981285.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing C/C composite materials have insufficient oxidation resistance at high temperatures. In particular, the oxidation and ablation rate of SiC coatings increases above 1650℃, and the ZrO2 particles have voids in their packing morphology, resulting in a high ablation rate of the material.

Method used

A bilayer Si-Zr self-reactive coating was prepared on the surface of C/C material. The outer layer was a polysiloxane SiC layer and the inner layer was a B4C-ZrSi2 layer. A micron-scale spherical shell structure was formed by high-energy ball milling and spraying. The coating self-healed during the oxidation process, forming a ZrB2-SiC multiphase coating to fill the voids and reduce the oxidation rate.

Benefits of technology

Within the temperature range of 1000℃ to 2000℃, the coating can effectively alleviate the oxidation rate of the material, reduce the ablation rate, and improve the high-temperature oxidation resistance and structural stability of the material.

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Abstract

The invention relates to a double-layer Si-Zr self-reaction coating and a preparation method thereof, and belongs to the technical field of carbon ceramic ablative materials. B4C powder is subjected to ball milling and crushed until the diameter is smaller than 100 nm, ZrSi2 alloy is added and evenly mixed with B4C subjected to ball milling, a polycarbosilane solution is added for ball milling, ZrSi2 slurry wrapped by B4C is obtained and dried, and ZrSi2 powder wrapped by B4C is obtained; adding the powder into a polysiloxane solution containing SiC powder, and mechanically and sufficiently mixing to obtain slurry; spraying the slurry on the surface of the C / C material through pressurization, and drying to obtain the coating material. The coating comprises the polysiloxane-containing SiC layer on the outer layer and the B4C-ZrSi2 layer on the inner layer, in the oxidation ablation process, the crack effect of the coating on the surface layer can be achieved within a certain time, and the oxidation rate of the material is greatly decreased.
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