| 摘要 |
PURPOSE:To obtain a sealing cap having excellent insulation and sealing characteristics by utilizing a mixture of sodium silicate and lithium silicate as the binder in order to form a glass for hermetic sealing. CONSTITUTION:A mixture of PbO-B2O3 low melting point glass powder of 85 parts and an aqueous solution of 15 part of mixture where sodium silicate and lithium silicate are mixed in the weight ratio of 1:1 is formed into cylindrical form with a hydraulic press. A glass mold obtained is dried up in order to remove the water content for 30min at 120 deg.C. Thereafter, such cylindrical glass mold 4a is disposed between a ring-shaped body 2 and a pin 3 arranged to a jig 11 made of carbon, it is then heated in the electric furnace for 30min at 450 deg.C under the nitrogen gas ambient. Thereby, the glass is melted to the body 2 and pin 3 and a sealing cap can be formed. Any fault is generated during the molding because sodium silicate and lightium silicate are used as the binder and fault generating rate of glass layer during manufacture of sealing cap is only 1%. |
