A method for producing an aluminum-based ceramic core

CN122254871APending Publication Date: 2026-06-23SHANGHAI JIAOTONG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Filing Date
2026-03-31
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively reduce the sintering shrinkage of Al2O3-based ceramic cores while maintaining high porosity and significantly improving their mechanical strength, resulting in difficulties in core removal and insufficient strength, making it difficult to meet the engineering application requirements of high-performance aluminum-based ceramic cores.

Method used

By combining nano-silicon nitride powder and modified amorphous mullite fibers, the oxidative expansion effect of nano-Si3N4 compensates for sintering shrinkage and generates a high-strength mullite phase. At the same time, the fibers form a three-dimensional network to lock the porosity, achieving chemical and physical reinforcement.

Benefits of technology

It achieves low shrinkage (0.08%-0.6%), high porosity (40%-49%), high room temperature flexural strength (27-37 MPa), and high temperature flexural strength (19-26 MPa) in aluminum-based ceramic cores, resolving the contradiction between strength and core removal performance and meeting the requirements of precision casting.

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Abstract

The application provides a preparation method of an aluminum-based ceramic core, comprising the following steps: providing silicon nitride nano-powder; preparing amorphous mullite fiber with a core-shell structure, wherein the shell layer is SiO2, and the core layer is amorphous mullite fiber; preparing ceramic core slurry for hot-pressing injection by using the silicon nitride nano-powder, the amorphous mullite fiber with the core-shell structure, and electrically fused corundum powder, a plasticizer and a surfactant; preparing a ceramic core green body based on the ceramic core slurry by using a hot-pressing injection method; and performing debinding and sintering on the ceramic core green body to obtain an aluminum-based ceramic core. The ceramic core prepared by the application balances the shrinkage, high strength and high porosity, and has good comprehensive performance.
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Citation Information

Patent Citations

  • Hot-press casting ceramic core and preparation method thereof

    CN116924815A

  • Raw materials of near-zero shrinkage silicon-based ceramic core and preparation method of near-zero shrinkage silicon-based ceramic core

    CN119320268A

  • Raw materials for in-situ generation of core-shell structure ceramic core and preparation method

    CN119350009A