High-strength and high-toughness aluminum nitride ceramic and preparation method thereof

By combining the sol-gel method and the external magnetic field casting method with multi-particle-size powder compounding, the problems of abnormal grain growth and reduced mechanical properties of aluminum nitride ceramics during high-temperature sintering were solved, and the preparation of high-strength and high-toughness aluminum nitride ceramics was achieved, which is suitable for high-reliability power electronic modules.

CN120965342APending Publication Date: 2025-11-18四川富乐华半导体科技有限公司 +1
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Patent Information

Application Number
CN202511275539.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-08
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing aluminum nitride ceramics suffer from abnormal grain growth and lattice oxygen defects introduced by excessive addition of sintering aids during high-temperature sintering, resulting in reduced mechanical properties and low bending strength, making it difficult to meet the application requirements of high-reliability power electronic modules.

Method used

By employing a sol-gel uniform coating mechanism and an external magnetic field casting method, combined with multi-particle-size powder compounding, aluminum nitride whiskers are magnetized and an external magnetic field is applied during low-temperature sintering. This causes the whiskers to align in the direction of force, forming a "core-shell" structure and a bridging-pull-out effect, thereby improving the fracture toughness and bending strength of the material.

Benefits of technology

It significantly improves the fracture toughness and bending strength of aluminum nitride ceramics, enhances the mechanical properties and corrosion resistance of the material, and ensures that the substrate does not warp or crack under long-term thermal shock and power cycling, making it suitable for high-reliability power electronic modules.

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Abstract

The invention discloses a high-strength and high-toughness aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramics, a sol-gel method is adopted to coat the surface of aluminum nitride with a stable shell layer to form a core-shell structure, meanwhile, the low lattice mismatch rate of a core-shell interface is utilized to reduce thermal resistance, and toughness and thermal conductivity are both considered; according to the external magnetic field tape casting method, the magnetic dipole moment orientation principle is utilized, an external magnetic field is applied in the tape casting stage, the in-plane mechanical property is improved, and the fracture toughness is improved through the magnetism of aluminum nitride whiskers; a reinforcement is introduced to improve the mechanical property and corrosion resistance of the aluminum nitride ceramic material, multi-granularity powder is compounded, large-particle aluminum nitride powder is used as a sintering and heat-conducting framework material, and high activity provided by submicron particles is utilized to promote sintering, so that the sintering temperature of aluminum nitride can be remarkably reduced, and the performance is greatly improved; and the aluminum nitride substrate expands more application fields on a future packaging circuit.
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