Kind of electrovacuo glass in a YAG display tube

摘要

Yttrium-Aluminum-Garnet (YAG) single crystal has the properties of very well optical transparency and high thermal conductivity. By the method of liquid phase epitaxy, a continuous cathodoluminescent thin film with the characteristics of high brightness, high resolution and high contrast ratio can be grown on the YAG substrate. Whereas, the thermal expansion coefficient of YAG single crystal is about 75 $MUL 10$+$MIN@7$//$DGR@C. It can only be sealed to 95% alumina ceramics previously. In this paper, a kind of low priced glass whose thermal expansion coefficient is approximate 75 $MUL 10$+$MIN@7$//$DGR@C has been developed. This kind of glass can realize matched sealing to YAG single crystal, and have high absorption coefficient of soft x-ray ($GREQ 80 cm$+$MIN@1$/ at 0.6 angstroms wavelength). It can take the place of alumina ceramics to manufacture YAG display tube envelope.