Lithium disilicate glass-ceramic with high strength and high transparency and preparation method and use thereof

A lithium disilicate glass-ceramic, wherein a raw material composition of the lithium disilicate glass-ceramic comprises:

• 63-75 wt % of SiO2, 13-18 wt % of Li2O, 1-6 wt % of Al2O3, 1-10 wt % of K2O, 2-6 wt % of P2O5, 0-4 wt % of an additive and 0-10 wt % of a colorant;
• a main crystal phase of the lithium disilicate glass-ceramic is a lithium disilicate crystal, and an impurity phase of the lithium disilicate glass-ceramic is any one or a combination of at least two selected from the group consisting of lithium metasilicate, lithium phosphate and quartz;
• the lithium disilicate crystal has a size larger than 700 nm and not larger than 1434 nm, and a length-diameter ratio not less than 3 and not larger than 7.1;
• the colorant comprises any one or a combination of at least two selected from the group consisting of Fe2O3, TiO2, CuO, Cr2O3, MnO, SeO2, In2O3 and a rare earth oxide;
• and
• the rare earth oxide comprises any one or a combination of at least two selected from the group consisting of La2O3, Nd2O3, Tb2O3, and Pr6O11.