PRODUCTION OF FLUORIDE GLASS

摘要

PURPOSE:To facilitate the removal of oxides or hydroxides from fluoride glass by making an activated reaction gas by introducing a reaction gas containing halogen or halide into a plasma atmosphere and bringing the activated reaction gas into contact with the heat-melted part of the fluoride glass. CONSTITUTION:Fluoride glass 1 is charged in a crucible 2 placed inside the cylindrical reactor tube 3 and the inside of the reactor tube 3 is filled with dried argon. Then, the fluoride glass 1 is melted by heating with a high frequency heating coil 5. In the meantime, a reaction gas containing halogen such as fluorine or a halide such as carbon tetrachloride is introduced into the plasma atmosphere in the reaction furnace 91 of the plasma generator 9 and activated. Then, the activated reaction gas is brought into contact with the heat-melted part of the fluoride glass 1 to remove hydroxides and oxides from the glass and give purified fluoride glass.