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The whole process of producing optical glass is big secret.

2017/4/27      view:

            Raw materials for the production of optical glass are some oxide, hydroxide, nitrate and carbonate, and according to the requirements of the formulation, the introduction of phosphate or fluoride. In order to ensure the transparency of the glass, we must strictly control the content of colored impurities, such as iron, chromium, copper, manganese, cobalt, nickel, etc.. When the ingredients require accurate weighing, uniform mixing. The main production processes are melting, forming, annealing and testing.

              Continuous melting process of single crucible, batch melting method and tank furnace. A single crucible melting method can be divided into clay crucible melting method and platinum crucible melting method. No matter what kind of melting method used to stir, and strictly control the temperature and stirring, so that the glass to achieve a high degree of uniformity. Clay crucible melting the vast majority of crown and flint glasses, low cost, and in the melting temperature of the glass over the use of platinum temperature used. Platinum crucible smelting high quality, of clay crucible has serious erosion of glass, such as dense crown, dense barium flint, rare earth glass and fluorophosphate glass. Platinum crucible by electric heating, using silicon carbide or silicon molybdenum furnace. But it is a high frequency heating, which has a tendency to produce a large, rapid cooling and a certain requirement of the atmosphere.

               Since 60 "s, many countries have adopted continuous smelting furnace liner with platinum, so that the output of optical glass is greatly improved. The test indicators are: optical constants, optical uniformity, birefringence, stripes, bubble etc..