Graded particle zirconia ceramic and preparation method thereof
By using nanozirconia powder and porous microspheres as ceramic raw materials, combined with dry press forming and sintering processes, the existing ceramic toughening methods are solved, and the significant improvement of the fracture toughness of the ceramic is achieved.
CN119751056APending Publication Date: 2025-04-04HUNAN UNIV OF HUMANITIES SCI & TECH
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Patent Information
- Application Number
- CN202411815945.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-04-04
AI Technical Summary
Technical Problem
The existing ceramic toughening methods are complex and have no significant toughening effect, making it difficult to effectively improve the fracture toughness of 3Y-TZP ceramics.
Method used
Nanozirconia powder and porous microspheres are used as raw materials for graded granular zirconia ceramics. The porous microspheres have a closed or connected microporous structure inside. The nanozirconia powder and porous microspheres are mixed in proportion and the ceramics are obtained by dry press molding and sintering.
Benefits of technology
By introducing microporous structures, the fracture toughness of the ceramic is significantly improved, the crack propagation path is extended, and it has a significant microcrack toughening effect.
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Abstract
The invention discloses graded particle zirconia ceramic and a preparation method thereof.The graded particle zirconia ceramic comprises nano zirconia powder and porous microspheres, each porous microsphere is internally provided with a closed and / or communicated and through microporous structure, the particle size of each porous microsphere is 10-200 micrometers, and the particle size of each porous microsphere is 10-200 micrometers. And the aperture of the internal micropores is 0.3-1 [mu] m. According to the invention, the porous microsphere introduces a microporous structure into the graded particle ceramic, and the distribution of the microporous structure is consistent with that of the calcined microsphere in the graded particle ceramic, so that when the ceramic is damaged and the crack expands to a microporous area, the micropores at the tip of the crack bear larger stress due to a stress concentration effect; the microcrack toughening agent can induce main crack bifurcation or deflection, consumes crack propagation energy, prolongs a crack propagation path, and has an obvious microcrack toughening effect, so that the fracture toughness of the ceramic is improved.
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