Gas desorption and adsorption properties of graphite and water glass mixtures used as inner coatings of a cathode ray tube Original Research Article

The gas desorption properties of mixed graphite and water glass (K2SiO3 + H2O) were investigated by thermal desorption spectroscopy. It was observed that mainly H2O and CO2 were desorbed from the materials after a baking treatment in the atmosphere. The surface morphology became rough or smooth as the graphite content or the water glass increased, respectively. The amounts of the desorbed gases decreased with the graphite content or increased with the content of the water glass. Namely, the gas desorption amount became small as the enhancement of the surface roughness. The gas adsorption property for H2O or CO2 was also examined for the materials baked in a vacuum. The adsorption amount of H2O or CO2 was proportional to the graphite content, and this result corresponded with the effective surface area of the mixed graphite and water glass.