Method for improving mechanical property of Li2O-SiO2-P2O5-ZrO2-K2O glass ceramic by utilizing two-step heat treatment crystallization

By regulating the crystallization temperature and time of two-step heat treatment, the microstructure of Li2O-SiO2-P2O5-ZrO2-K2O glass ceramics is optimized, and the problem of insufficient mechanical properties of lithium disilicate glass ceramics is solved, which significantly improves its bending strength and fracture. Toughness, suitable for high load-bearing dental restorations.

CN119263640APending Publication Date: 2025-01-07NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH
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Patent Information

Application Number
CN202411692905.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2025-01-07

AI Technical Summary

Technical Problem

The mechanical properties of lithium disilicate glass ceramics are insufficient, which makes them unsuitable for use in high-load dental restorations, such as posterior tooth fixation bridges, which pose a clinical risk of failure.

Method used

By regulating the temperature and time of the two-step heat treatment crystallization, the microstructure of Li2O-SiO2-P2O5-ZrO2-K2O glass ceramics is optimized, the lithium metasilicate phase is eliminated, and the interlocking structure is formed, and its mechanical properties are improved.

Benefits of technology

The flexural strength, hardness and fracture toughness of Li2O-SiO2-P2O5-ZrO2-K2O glass ceramics are significantly improved, meeting the needs of high-load dental restorations, and enhancing their clinical reliability and scope of application.

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Abstract

The invention discloses a method for improving the mechanical property of Li2O-SiO2-P2O5-ZrO2-K2O glass ceramic by two-step heat treatment crystallization, which comprises the following steps: 1, respectively weighing Li2CO3, SiO2, (NH4) 2HPO4, nano ZrO2 and K2CO3, uniformly wet-mixing, and drying to obtain a mixed material; 2, the mixed material is heated and subjected to heat preservation to form molten glass, and then the molten glass is cast to obtain Li2O-SiO2-P2O5-ZrO2-K2O original glass; and 3, carrying out two-step heat treatment crystallization on the Li2O-SiO2-P2O5-ZrO2-K2O raw glass, and carrying out two-step heat treatment crystallization on the raw glass. According to the invention, the Li2O-SiO2-P2O5-ZrO2-K2O glass ceramic obtains a good microstructure and good mechanical properties by regulating and controlling the temperature and time of two-step heat treatment crystallization, and has a wide application prospect in the field of dental restoration.
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Citation Information

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