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Research Article | Open Access

Improved performances of lithium disilicate glass-ceramics by seed induced crystallization

Ting ZHAOaMei-Mei LIANaYi QINa( )Jian-Feng ZHUaXin-Gang KONGaJian-Feng YANGb
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, China
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
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Abstract

Self-reinforced lithium disilicate (Li2Si2O5, LD) glass-ceramics were hot pressing sintered by introducing 5 wt% Li2Si2O5 crystal seeds into two different glass compositions of SiO2–Li2O–P2O5–ZrO2–Al2O3–K2O–La2O3 (7C LD) and SiO2–Li2O–K2O–La2O3 (4C LD). The results show that the seeds play an important role in the crystallization inducement, and microstructural and property improvement of the glass, especially for the glass powder without the nucleating agent of P2O5. The microstructure features a wider bimodal grain size distribution with large rod-like crystals epitaxially grown along the seeds and small crystals nucleated from the glass powder itself, contributing to the improvement of the performance especially the fracture toughness. The specimen of 4C LD glass with the addition of 5 wt% Li2Si2O5 seeds exhibited the best comprehensive properties with a good flexural strength (396±7 MPa), improved fracture toughness (3.31±0.19 MPa·m1/2), and comparable translucency as IPS e.max. This research provides a new idea and method for the improvement of the fracture toughness of lithium disilicate glass-ceramics without affecting its aesthetic appearance, and lays the foundation for its clinical applications.

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Journal of Advanced Ceramics
Pages 614-626
Cite this article:
ZHAO T, LIAN M-M, QIN Y, et al. Improved performances of lithium disilicate glass-ceramics by seed induced crystallization. Journal of Advanced Ceramics, 2021, 10(3): 614-626. https://doi.org/10.1007/s40145-021-0463-4

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Received: 25 July 2020
Revised: 22 January 2021
Accepted: 22 January 2021
Published: 03 March 2021
© The Author(s) 2021

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