A ceramic radome material and a method for manufacturing the same

By preparing a Si3N4-Si composite preform with a shell-like nacreous layered structure and forming a Si3N4 fiber network filling layer, the problems of lightweighting and strengthening of silicon nitride radome materials were solved, and the material performance of hypersonic vehicles was improved.

CN118479896BActive Publication Date: 2026-07-24UNIV OF SCI & TECH BEIJING
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Patent Information

Application Number
CN202410541291.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-30
Publication Date
2026-07-24
Estimated Expiration
2044-04-30

AI Technical Summary

Technical Problem

Existing silicon nitride radome materials are insufficient in terms of lightweighting and toughness, making it difficult to meet the high-performance requirements of hypersonic vehicles.

Method used

A ceramic radome material with high open porosity and high fracture toughness was prepared by using a nitrided Si3N4-Si composite preform with a shell-like nacreous layered structure, forming a Si3N4 fiber network filling layer through high-temperature in-situ nitriding, and interleaving dense layers and filling layers. Combined with mechanical stirring, directional freezing, vacuum drying and nitriding heat treatment processes.

Benefits of technology

The material achieves lightweighting and improved mechanical properties, with an apparent porosity of 36.0–76.0%, a bulk density of 1.5–2.6 g/cm³, a compressive strength of 50–150 MPa, and a fracture toughness of 4.6–6.9 MPa·m¹/², making it suitable for hypersonic vehicles.

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Abstract

The application provides a ceramic radome material and a preparation method thereof, and belongs to the field of ceramic radomes. First, 20-80 parts of silicon nitride powder, 40-90 parts of elemental silicon powder, 0.2-0.5 parts of a sintering aid, 1-3 parts of a binder and 0.01-0.05 parts of a surfactant are dispersed in a solvent to form a suspension with a solid content of 30-60 wt%; then, mechanical stirring foaming, directional freezing, demolding, vacuum drying and nitriding heat treatment are performed to obtain the ceramic radome material. The ceramic radome material has an apparent porosity of 36.0-76.0%, a bulk density of 1.5-2.6 g / cm 3 , a compressive strength of 50-150 MPa and a fracture toughness of 4.6-6.9 MPa·m 1 / 2 . The ceramic radome material prepared by the application has the characteristics of high open porosity, light weight and high fracture toughness, and the preparation process is simple; the weight of the radome material can be reduced while the mechanical properties and fracture toughness of the radome material are improved, and the application has a good application prospect in the field of hypersonic aircrafts and the like.
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