A rare earth silicide bond coat material for high temperature environmental barrier coatings, and a method of making and using the same

The rare-earth silicide binder material prepared by magnetron sputtering solves the problem of low melting point of existing silicon binders, achieves oxidation resistance and corrosion resistance at high temperatures, and improves the service life of environmental barrier coatings.

CN122325243APending Publication Date: 2026-07-03INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Filing Date
2025-01-02
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing silicon carbide fiber-reinforced silicon carbide ceramic matrix composites are prone to corrosion and performance degradation at high temperatures. Existing silicon binder layers have low melting points and cannot meet the requirements of high-temperature, long-term applications in aero-engines.

Method used

A rare earth silicide binder material with a tetragonal RESi2 structure (GdxYb1-x)Siy was prepared by magnetron sputtering. The rare earth silicide binder layer was deposited on the surface of the ceramic matrix material by gadolinium target, ytterbium target and silicon target, and the solid solution of rare earth elements Gd and Yb was combined to improve the melting point and oxidation resistance.

Benefits of technology

The prepared rare earth silicide binder has a melting point higher than 1575℃, exhibits good oxidation resistance, extends the service life of the environmental barrier coating, and meets the high-temperature service requirements of aero-engines.

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Abstract

This invention belongs to the field of environmental barrier coatings, specifically relating to a rare earth silicide binder material for high-temperature environmental barrier coatings, its preparation method, and its application. The rare earth silicide binder material is a solid solution compound with a tetragonal RESi2 crystal structure and the chemical formula (Gd... x Yb 1‑x Si y Where x = 0.4–0.7, y = 1.5–3.0. The rare-earth silicide binder layer, applied between the environmental barrier coating top layer and the ceramic substrate material, is obtained using magnetron sputtering with high-purity Gd, Yb, and Si targets. It possesses a higher melting point than single-silicon binder materials and exhibits excellent oxidation resistance. This invention's novel rare-earth silicide system, as a candidate binder material system, is expected to improve the service temperature of the binder layer and extend the service life of the environmental barrier coating.
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