Composite ceramic with surface modification and preparation method thereof

By performing PVA surface modification on calcium phosphite and mixing with sodium alginate, combined with ice template method and pressurized film formation treatment, the problem of poor mechanical properties of low-temperature preparation ceramic materials is solved, and efficient preparation and significant performance improvement of composite ceramics are achieved.

CN119977424APending Publication Date: 2025-05-13CHINA HUBEI LONGZHONG LABORATORY +1
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Patent Information

Application Number
CN202411265173.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-10
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

The existing ice template method has poor mechanical properties for low-temperature preparation of ceramic materials, and it is necessary to propose a new composite ceramic material preparation process to improve its performance.

Method used

Polyvinyl alcohol (PVA) was used to modify the surface of calcium phosphite and mixed with sodium alginate. After forming by ice template method, pressurized film formation and alcohol soaking to store prestress. Finally, composite ceramics with surface modification were obtained by stacking hot pressing.

Benefits of technology

The bending strength and maximum fracture toughness of the composite ceramic block are significantly improved, the mechanical properties are improved by nearly 70% and 105%, and the process is simple, the raw materials are easy to obtain, and the preparation cost is low.

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Abstract

The invention discloses a composite ceramic with surface modification and a preparation method thereof, and the preparation method comprises the following steps: carrying out surface modification on brushite by using an organic modifier to obtain surface-modified brushite; uniformly mixing the surface-modified brushite slices with sodium alginate to obtain mixed slurry; carrying out molding treatment on the mixed slurry by adopting an ice template method, and then carrying out freeze drying to obtain a molded crude product; the formed crude product is subjected to pressurization film forming treatment, and a primary film is obtained; soaking the primary film in alcohol, then taking out and drying to obtain a secondary film; and spin-coating chitosan on the surfaces of a plurality of secondary films, and stacking and hot-pressing to obtain the composite ceramic with surface modification. According to the preparation method, an ice template method is adopted, and the interface interaction is synergistically enhanced through PVA surface modification and alcohol soaking, so that the mechanical property of the prepared composite ceramic is remarkably improved; the method has the advantages of easily available raw materials, simple process and lower preparation cost, and is beneficial to popularization and application.
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