GLASS FOR MAKING GRADIENT IMAGE TRANSLATOR BY ION EXCHANGE METHOD Russian patent published in 1998 - IPC

FIELD: glass industry. SUBSTANCE: glass has, mol.%: silicon oxide (SiO₂) 56-63; lithium oxide (SiO₂) 10-16; sodium oxide (Na₂O) 10-12; zirconium oxide (ZrO₂) 8-11; antimony oxide (Sb₂O₃) 0.1-0.5; R'O 2-5 where R' - Mg, Ca, Zn, Ba, Sr, Pb; R''O 0.5-3 where R'' - La, Ge, Ti, Ta, Nb, W. Properties: glass refraction coefficient is 1.52-1.61, treatment temperature in sodium salt melt is 580-700 C. Glass is used for making rigid medicinal endoscope by method of ion-exchange diffusion. EFFECT: improved quality of glass. 2 tbl