Lithium, aluminum and silicon series microcrystalline glass for dentistry and preparation method thereof

Abstract

The invention discloses lithium, aluminum and silicon series microcrystalline glass for dentistry and a preparation method thereof. The preparation method includes: using Li2CO3, SiO2, K2CO3 and La2O3 as raw materials, and adopting a method of melt cooling combined with water quenching to prepare lithium-silicon binary glass powder; using A12O3, AlF3 and tetraethyl orthosilicate as raw materials, and adopting a sol gel-sintering method to prepare mullite crystal whisker with high dispersity; subjecting the glass powder and the mullite crystal whisker to mixing and hot-pressing sintering, wherein in the process of sintering, the mullite crystal whisker is in in-situ reaction with the glass powder to be converted into beta-spodumene crystal whisker; finally to obtain the lithium, aluminum and silicon series microcrystalline glass taking the beta-spodumene crystal whisker, lithium disilicate and lithium metasilicate as main crystal phase. The lithium, aluminum and silicon series microcrystalline glass has the advantages of high strength, high toughness, low thermal expansion coefficient and translucence and has wide application prospect in the field of restorative dentistry.

Description

technical field [0001] The invention relates to a glass-ceramic suitable for the field of dental restoration, in particular to a lithium-aluminum-silicon-based glass-ceramic and a preparation method thereof. Background technique [0002] Lithium-aluminum-silicon glass-ceramics is a kind of composite material combining crystal phase and glass phase prepared by various oxides through melting, molding, and heat treatment processes. It belongs to an important ceramic material in the field of glass-ceramics and has excellent properties. Chemical stability, good semi-permeability, low thermal expansion coefficient and other characteristics. Its unique aesthetics and biological properties are unmatched by metal materials and polymer materials, and it has broad application prospects in the field of dental restoration. The usual preparation of lithium-aluminum-silicon-based glass-ceramics is to melt various oxides containing relatively high amounts of alumina at high temperature and...

AI Technical Summary

Problems solved by technology

However, the prepared lithium-aluminum-silicon-based glass ceramics mainly improved the strength, but did not improve the toughness.

[0004] At present, the difficulties faced by lithium-aluminum-silicon glass ceramics lie in two aspects: 1) the strength and toughness of the mechanical properties of the material cannot be improved at the same time; 2) the preparation process is complicated and the cost is high

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