초록 ▼

Acid and alkali oxides are smelted for an extended period of time at a first elevated temperature above their melting temperatures. The smelted mixture is then quenched in water and fritted. The fritted mixture is then disposed between a pair of members which are to be hermetically sealed relative t

Acid and alkali oxides are smelted for an extended period of time at a first elevated temperature above their melting temperatures. The smelted mixture is then quenched in water and fritted. The fritted mixture is then disposed between a pair of members which are to be hermetically sealed relative to each other. The fritted mixture is then at least partially fused in an oxygen atmosphere at a second temperature below the first temperature for a relatively short period of time. The at least partially fused mixture is then rapidly cooled in air. In this way, the mixture is provided with a partially amorphous state and a partially crystalline state. The crystals in the mixture are disposed primarily at the borders of at least a particular one of the members to be sealed. The mixture hermetically seals the two members, is resistant to acids and alkalis and inhibits the propagation of cracks. The mixture is particularly adapted to seal steels such as stainless steels and steel alloys including cobalt and molybdenum or including nickel and chromium. The mixture is also adapted to seal noble metals such as platinum and also alloys such as those including nickel.

대표청구항 ▼

In combination, a first member made from a noble metal, a second member disposed in spaced but enveloping relationship to the first member and made from a material selected from the group consisting of stainless steel, steel alloy containing colbalt, steel alloy containing a combination of cobalt an

In combination, a first member made from a noble metal, a second member disposed in spaced but enveloping relationship to the first member and made from a material selected from the group consisting of stainless steel, steel alloy containing colbalt, steel alloy containing a combination of cobalt and molybdenum and steel alloy containing nickel and chromium, a ceramic and alumina, and a polycrystalline insulating material preformed by heating at a first elevated temperature to have a partially crystalline and partially amorphous structure before application to the first and second members and disposed between the first and second members in hermetically sealed relationship to the first and second members and having a partially crystalline and partially amorphous structure and fused to the first and second members in an oxygen-rich atmosphere at a second elevated temperature, less than the first elevated temperature, of the first and second members and the polycrystalline insulating material, with the relative amount of the crystalline structure at the boundary of the second member being greater than the relative amount of the crystalline structure at positions removed from such boundary, the polycrystalline material being resistant to acids and alkalis. In combination, a first member, a second member displaced outwardly from the first member, and an insulating material hermetically sealing the first and second members and having a partially amorphous and partially crystalline composition and having an increased polycrystalline composition at the boundary with the second member than at positions displaced from the second member, including the following materials in the following range of percentages by weight: ________________________________ - Range of Relative Precentages Material by Weight ________________________________ Lead oxide (PbO) 28-32 Silicon dioxide (SiO2) 38-42 Boric oxide (B2O3) 2-4 Aluminum oxide (Al2O3) 1-2 Manganese oxide (MnO). 6-11 ________________________________