Choosing the raw material for feeding SiO2 into uviol electrovacuum glasses

Milk-white quartz grit from the Taldy-Kurganskoe and Svetlorechenskoe Deposits, granulated vein quartz from the Kyshtymskoe and Maukskoe Deposits, Brazil rock crystal and synthetic "fluoride" silica were investigated for use as raw materials for the production of uviol electrovacuum glasses. The raw materials were heat treated and analysed by IR spectroscopy, optical microscopy, DTA, and XRD. The decrepitation activity was determined. Quartz from the Taldy-Kurganskoe (Kazakhstan) Deposit was shown to be suitable for uviol glasses, since it contains a low content of impurities, a large amount of gas and liquid inclusions, and should provide for active silicate and glass formation. 4 refs.