Low temperature fired electrical components and method of making same
AssigneeSprague Electric Company
InventorGaleb H. Maher
Life of this patent
Estimating the term…
Abstract
A low temperature fired glass-ceramic system encompassing a series of temperature compensating bodies having temperature coefficients that cover a wide range and possessing dielectric constants of from 30 to 125. This system consists of a mixture of a prefired blend of baria, titania and rare earth oxides, and a low firing glass formulation wherein the mixture is fired within the temperature range of 1,800.degree. F to 2,100.degree. F. A slip suspension of this mixture can be used to manufacture monolithic capacitors that utilize a relatively inexpensive palladium-silver electrode.
Claims10
An electrical component comprising a low temperature fired ceramic body of a fired blend containing 70 to 92% by weight of a calcined high temperature ceramic mixture and 8-30% by weight of a low firing temperature glass formulation having a melting temperature less than 1,600.degree.F, said calcined ceramic mixture containing from 0-30 mole percent baria, 45-95 mole percent titania and 5-50 mole percent of a rare earth oxide selected from the group consisting of neodymium, lanthanum and mixtures thereof, said glass formulation consisting in weight percent essentially of 5-30% of the glass former oxides selected from the group consisting of B.sub.2 O.sub.3 and SiO.sub.2, 0-5% Al.sub.2 O.sub.3, 0-15% ZnO, 0-20% CdO, and at least 35% of an oxide selected from the group consisting of Bi.sub.2 O.sub.3 and PbO;
- and at least one metallic film located within said ceramic body, said metallic film having a melting point not substantially greater than the firing temperature of said body.
A method of forming a low temperature fired ceramic electrical component by forming a body from a slurry with at least one metallic film within said body, and firing said body, wherein the improvement comprises:
- ball milling a high temperature ceramic mixture of 0-30 mole percent baria, 45-95 mole percent of a rare earth oxide selected from the group consisting of neodymium, lanthanum and mixtures thereof;
- calcining said high temperature ceramic mixture at a temperature of between 2250.degree.F to 2600.degree.F;
- making said slurry of from 70 to 92% by weight of said calcined mixture and from 8 to 30% by weight of a low firing glass formulation consisting in weight percent essentially of 5-30% of the glass former oxides selected from the group consisting of B.sub.2 O.sub.3 and SiO.sub.2, 0-5% Al.sub.2 O.sub.3, 0-15% ZnO, 0-20% CdO, and at least 35% of an oxide selected from the group consisting of Bi.sub.2 O.sub.3 and PbO, in a suitable binder;
- and firing said body at a temperature of between 1800.degree.F and
Dependencies are inferred from the claim text.