Method of forming hermetic seals

【摘要】The forming of hermetic seals suitable for sealing materials having dissimilar thermal expansions which are formed by reacting an effective amount of a metal powder, selected from the group consisting of aluminum, antimony and zirconium, with glass frit having a softening point of <750.degree. C. and a coefficient of thermal expansion sufficiently compatible with the materials being sealed to yield seals characterized by a coefficient of thermal expansion closely matching or similar to those of the materials being sealed and a use temperature equal to or greater than 1000.degree. C. The seals of this invention are particularly suitable for bonding ceramic to ceramic.

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We claim: 1. A method of producing a mechanically strong, hermetic seal between and bonding together ceramic materials having dissimilar thermal expansions, which comprises: preparing a mixture consisting of glass frit having a softening point of less than 750.degree. C. and a metal powder selected from the group consisting of 2-40 wt.% aluminum powder, 2-23 wt.% antimony powder and 2-17 wt.% zirconium powder, said wt.% based on the glass frit plus metal powder, the frit having a sufficiently compatible coefficient of thermal expansion and the metal powder being in an effective amount when mixed with the frit such that the mixture, when reacted, will yield a seal characterized by a coefficient of thermal expansion closely matching or similar to that of the materials being sealed, and by a use temperature of up to 1000.degree. C. when antimony or zirconium powder is chosen, and greater than 1000.degree. C. when aluminum powder is chosen, adding sufficient vehicle to provide a sealing mixture with viscosity to effect coating of the materials being sealed, applying an amount of the sealing mixture to the sealing surfaces of the materials being sealed to effect a seal therebetween, and firing the sealed materials to a temperature sufficient to complete the reaction and form the seal. 2. The method of claim 1 wherein the selected metal powder is aluminum powder with a particle size of not greater than 60 microns. 3. The method of claim 1 wherein the selected metal powder is antim

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