| 摘要 |
PROBLEM TO BE SOLVED: To suppress the volatilization of a boric acid component and a phosphoric acid component in firing and to prevent the generation of bubbles by incorporating a PbO-B2O3, P2O5-SnO or P2O5-SnO-B2O3 glass powder and specifying water content. SOLUTION: This sealing material contains a glass powder containing B2O3 and/or P2O5 and capable of sealing at a low temperature, e.g. a PbO-B2O3, P2O5-SnO or P2O5-SnO-B2O3 glass powder and has <=100 ppm, preferably about <=50 ppm water content. The glass powder having a low water content is obtained by bubbling oxygen or an inert gas such as nitrogen in the melting of glass. Thus, the evaporation of water in firing is reduced, so that the volatilization of a boric acid component and a phosphoric acid component are reduced, the generation of bubbles from the sealing material is prevented and an adverse effect on the electron emission part of a display tube is eliminated. The sealing material is applicable to the sealing of a cathode-ray tube, a plasma display, and the like.
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