Solder-Glass Sealing of Microwave Antenna Windows

摘要

Simple solder-glass techniques are described for vacuum-tight sealing of mica and glass microwave windows in a metal frame having a compatible coefficient of thermal expansion. The seal is made by applying 0.020 in. diameter threads of Corning No. 7570 solder glass to heated frame and window. A hand torch and quartz boat proved satisfactory for heating with mica of thicknesses of 0.003 in. or greater. A simple cone resistance heater with variac and a metal table provided more precise heating for sealing thinner windows. The materials are inexpensive; the procedure and equipment are simple. (Author)