| 摘要 |
<p>The invention provides a high-refractivity and low-dispersion optical glass suitable for precise press molding, and the glass comprises, in wt%, SiO<SUB>2</SUB> 1-8, B<SUB>2</SUB>O<SUB>3</SUB> 16-30, La<SUB>2</SUB>O<SUB>3</SUB> 15-40, Gd<SUB>2</SUB>O<SUB>3</SUB> 0-20, ZnO 8-30, Nb<SUB>2</SUB>O<SUB>5</SUB> 0.5-14.5, WO<SUB>3</SUB> 0-12.5, TiO<SUB>2</SUB> 0-9, Li<SUB>2</SUB>O 0.5-4, ZrO<SUB>2</SUB> 1-10, Y<SUB>2</SUB>O<SUB>3</SUB> 0-5, Yb<SUB>2</SUB>O<SUB>3</SUB> 0-5, Lu<SUB>2</SUB>O<SUB>3</SUB> 0-5, Na<SUB>2</SUB>O 0-3, K<SUB>2</SUB>O 0-2, Al<SUB>2</SUB>O<SUB>3</SUB> 0-2, BaO 0-3, CaO 0-3, SrO 0-3, MgO 0-3, Sb<SUB>2</SUB>O<SUB>3</SUB> 0-0.5, and SnO<SUB>2</SUB> 0-0.5. The invention adopts a B<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>-La<SUB>2</SUB>O<SUB>3</SUB>(Gd<SUB>2</SUB>O<SUB>3</SUB>)-ZnO glass system, and adjusts contents of Nb<SUB>2</SUB>O<SUB>5</SUB>, WO<SUB>3</SUB> and TiO<SUB>2</SUB> to a reasonable proportion to make glass have the required optical constants and good physicochemical properties suitable for precise press molding. The glass has a transformation temperature (Tg) of lower than 560 ºC, but does not comprise expensive Ta<SUB>2</SUB>O<SUB>5</SUB>, meanwhile it has good chemical resistance, can be stably produced in large scale with a single pot, a continuous smelting furnace, etc., and is suitable for precise press molding of asphericallenses and other optical components in a low cost.</p> |
