Glass solder for sealing ceramic diaphragm of sodium-nickel battery and metal-ceramic hot-pressing sealing ceramic end cover as well as preparation and application of glass solder

The invention provides a glass solder for sealing a ceramic diaphragm of a sodium-nickel battery and a metal-ceramic hot-pressing sealing ceramic end cover, a preparation method of the glass solder and a process of applying the solder to coating. The solder is glass paste and is composed of 50-70 parts of fine glass powder, 20-40 parts of Al2O3 powder, 0.1-0.5 part of white carbon black, 0.1-0.5 part of bentonite, and deionized water. The glass paste with the solid content being 75% or above and the viscosity being 400-700 cP is obtained. The fine glass powder is prepared from the following components in parts by weight: 40 to 60 parts of SiO2, 5 to 15 parts of Al2O3, 20 to 60 parts of H3BO3, 2 to 10 parts of Na2CO3, 3 to 12 parts of BaCO3, 3 to 12 parts of SrCO3 and 3 to 8 parts of CaCO3. The invention further provides a preparation method of the glass solder and a solder coating TCB sealing process, a sintered glass sealing product is used for assembling a sodium-nickel battery, and the service life of the