Gas-Desorption Properties of Inner Coating Materials Used for Cathode-Ray Tube : Effect of Water Glass Component of Inner Coating Material on Gas Desorption

For two types of inner coating materials with different component of water glass, the gas desorption properties were measured by using thermal desorption spectroscopy.<BR>The major outgassing species during the heating up to 773 K were CO<SUB>2</SUB> and H<SUB>2</SUB>O in both types. In the thermal desorption spectra of CO<SUB>2</SUB> and H<SUB>2</SUB>O, a large desorption peak was observed at approximately 400 K. The total desorption amount of CO<SUB>2</SUB> and H<SUB>2</SUB>O for the (A + B) type with the water glass, (K<SUB>2</SUB>O + Li<SUB>2</SUB>O) ·3.8SiO<SUB>2</SUB>·4H<SUB>2</SUB>O, was approximately a half of that of the A type with the water glass, K<SUB>2</SUB>O·3.8SiO<SUB>2</SUB>·4H<SUB>2</SUB>O. The (A + B) type can reduce both the baking temperature and the pumping time in the manufacturing process of cathod ray tube, compared to the A type.