M5Si3 type high-entropy aluminum silicide ceramic material as well as preparation method and application thereof

By preparing M5Si3 type high-entropy aluminum silicide ceramic materials, and using flash sintering and spark plasma sintering technologies to form a dense oxide layer, the problem of insufficient oxidation resistance of high-entropy ceramic materials in high-temperature oxidation environments was solved, enabling long-term service capability in hot-end components of hypersonic vehicles.

CN122403985APending Publication Date: 2026-07-17SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202610660041.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing high-entropy carbide and high-entropy diboride ceramic materials have poor oxidation resistance under high-temperature oxidizing conditions, which cannot meet the long-term service requirements of hot-end components of hypersonic aircraft under extreme high-temperature environments.

Method used

M5Si3 type high-entropy aluminum silicide ceramic material was prepared by mixing elemental metal powder with aluminum powder and silicon powder, followed by wet ball milling, flash sintering, and spark plasma sintering. This process formed a dense oxide layer structure of glass phase + high melting point oxide, which improved the oxidation resistance.

Benefits of technology

It can resist oxidation for 80 minutes at 2400℃ with an oxidation depth of only 0.688 mm, meeting the requirements for hot-end structure protection of hypersonic vehicles. Moreover, the preparation method is simple and can be mass-produced.

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Abstract

The invention provides an M5Si3 type high-entropy aluminum silicide ceramic material as well as a preparation method and application thereof, and belongs to the technical field of high-entropy ceramics. The preparation method comprises the following steps: mixing metal elementary substance powder, aluminum powder and silicon powder, and carrying out wet ball milling to obtain mixed powder; pressing the mixed powder into a green body, and then carrying out flash sintering to obtain an M5Si3 type high-entropy aluminum silicide clinker; and pressing the M5Si3 type high-entropy aluminum silicide clinker into a green body, and then carrying out spark plasma sintering to obtain the M5Si3 type high-entropy aluminum silicide ceramic. The M5Si3 type high-entropy aluminum silicide ceramic has good 2400 DEG C long-time high-temperature oxidation resistance, and the preparation method has the advantages of simple operation and process flow, good reproducibility, short reaction time and the like, is suitable for component regulation and control and large-scale industrial production, and has wide application prospects. The method has a very wide application prospect in the field of hypersonic flight vehicle hot end structure protection.
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