A high-entropy aluminum silicide ceramic material of type M5Si3, its preparation method and application

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

This invention provides an M5Si3 type high-entropy aluminum silicide ceramic material, its preparation method, and its applications, belonging to the field of high-entropy ceramic technology. The invention involves mixing elemental metal powder, aluminum powder, and silicon powder, followed by wet ball milling to obtain a mixed powder. The mixed powder is then pressed into a green body and flash-sintered to obtain an M5Si3 type high-entropy aluminum silicide clinker. This clinker is further pressed into a green body and then spark-plasma sintered to obtain the M5Si3 type high-entropy aluminum silicide ceramic. The M5Si3 type high-entropy aluminum silicide ceramic of this invention exhibits excellent resistance to prolonged high-temperature oxidation at 2400 °C. Furthermore, its preparation method is simple in operation and process flow, has good reproducibility, and a short reaction time, making it suitable for component control and large-scale industrial production. It has a very broad application prospect in the field of hot-end structure protection for hypersonic vehicles.
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