1 results about "Nano crystallites" patented technology

This invention relates to the field of special optical glass technology, and discloses a special optical glass, its preparation method, and its applications. The method includes: using oxides such as La2O3 and Ta2O5, as well as LaF3 and / or YF3, as raw materials, mixing them in a specific molar ratio and drying them to obtain a mixture; placing the mixture in a platinum crucible, melting it at 1580-1620℃ for 3-5 hours in air atmosphere while stirring; pouring it into a preheated mold at 300-500℃ to form a glass blank; annealing it at 540-580℃ and then cooling it; nucleating it at 580-590℃ and crystallizing it at 600℃ to precipitate ZrO2 nanocrystals; after crystallization, surface treating it, immersing it in a molten salt bath of KF:NaF=2:1 for ion exchange, and finally washing it with deionized water and drying it at 50-80℃. This invention achieves a high refractive index and a suitable Abbe number, while significantly improving the structural stability and crack resistance of the material.