US5089932A — Solid dielectric capacitor and method of manufact…

Claim 1

Independent Claim 171 words

A solid dielectric capacitor comprising a dielectric ceramic body and at least two electrodes in contact therewith, the dielectric ceramic body consisting essentially of: (a) 100 parts by weight of a major ingredient expressed by the formula, (1-α){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+αCaZrO.sub.3 where M is either or both of magnesium and zinc; R is at least one metal selected from scandium, yttrium, gadolinium, dysprosium, holmium, erbium, ytterbium, terbium, thulium and lutetium; α is a numeral in the range of 0.005 to 0.040, k is a numeral in the range of 1.00 to 1.05; x is a numeral in the range of 0.01 to 0.10; and y is a numeral greater than 0 and not greater than 0.04; and (b) from 0.2 to 5.0 parts by weight of an additive mixture of at least two members selected from the group consisting of boric oxide or lithium oxide, silicon oxide and at least one metal oxide selected form the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.

Claim 2

Dependent Claim 171 words

A solid dielectric capacitor comprising a dielectric ceramic body and at least two electrodes in contact therewith, the dielectric ceramic body consisting essentially of: (a) 100 parts by weight of a major ingredient expressed by the formula, (1-α){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+αCaZrO.sub.3 where M is either or both of magnesium and zinc; R is at least one metal selected from scandium, yttrium, gadolinium, dysprosium, holmium, erbium, ytterbium, terbium, thulium and lutetium; α is a numeral in the range of 0.005 to 0.040, k is a numeral in the range of 1.00 to 1.05; x is a numeral in the range of 0.01 to 0.10; and y is a numeral greater than 0 and not greater than 0.04; and (b) from 0.2 to 5.0 parts by weight of an additive mixture of at least two members selected from the group consisting of boric oxide or lithium oxide, silicon oxide and at least one metal oxide selected form the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.

Claim 3

Dependent Claim 208 words

The solid dielectric capacitor of claim 1 wherein the additive mixture is an additive mixture of lithium oxide, silicon dioxide and at least one metal oxide selected from the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide, the relative proportions of lithium oxide, silicon dioxide and at least one selected metal oxide constituting the additive mixture being in that region of the ternary diagram of FIG. 2 attached hereto which is bounded by lines sequentially connecting: the point A where the additive mixture consists of one mole percent lithium oxide, 80 mole percent silicon dioxide, and 19 mole percent metal oxide; the point B where the additive mixture consists of one mole percent lithium oxide, 39 mole percent silicon dioxide, and 60 mole percent metal oxide; the point C where the additive mixture consists of 30 mole percent lithium oxide, 30 mole percent silicon dioxide, and 40 mole percent metal oxide; the point D where the additive mixture consists of 50 mole percent lithium oxide, 50 mole percent silicon dioxide, and 0 mole percent metal oxide; and the point E where the additive mixture consists of 20 mole percent boric oxide, 80 mole percent silicon dioxide, and 0 mole percent metal oxide.

Claim 4

Dependent Claim 233 words

The solid dielectric capacitor of claim 1 wherein the additive mixture is an additive mixture of boric oxide, silicon dioxide and at least one metal oxide selected from the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide, the relative proportions of boric oxide, silicon dioxide and at least one selected metal oxide constituting the additive mixture being in that rigion of the ternary diagram of FIG. 3 attached hereto which is bounded by lines sequentially connecting: the point A where the additive mixture consists of one mole percent boric oxide, 80 mole percent silicon dioxide, and 19 mole percent metal oxide; the point B where the additive mixture consists of one mole percent boric oxide, 39 mole percent silicon dioxide, and 60 mole percent metal oxide; the point C where the additive mixture consists of 30 mole percent boric oxide, 0 mole percent silicon dioxide, and 70 mole percent metal oxide; the point D where the additive mixture consists of 90 mole percent boric oxide, 0 mole percent silicon dioxide, and 10 mole percent metal oxide; the point E where the additive mixture consists of 90 mole percent boric oxide, 10 mole percent silicon dioxide, and 0 mole percent metal oxide; and the point F where the additive mixture consists of 20 mole percent boric oxide, 80 mole percent silicon dioxide, and 0 mole percent metal oxide.

Claim 5

Dependent Claim 20 words

The solid dielectric capacitor of claims 1, 2 or 3 wherein the electrodes are buried in the dielectric ceramic body.

Claim 6

Dependent Claim 18 words

The solid dielectric capacitor of claims 1, 2 or 3 wherein the electrodes are of a base metal.

Claim 7

Dependent Claim 13 words

The solid dielectric capacitor of claim 5 wherein the base metal is nickel.

Claim 8

Dependent Claim 214 words

A process for the manufacture of a solid dielectric capacitor which comprises: (a) providing in finely divided form a mixture of: 100 parts by weight of a major ingredient expressed by the formula, (1-α){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+αCaZrO.sub.3 where M is either or both of magnesium and zinc; R is at least one metal selected from scandium, yttrium, gadolinium, dysprosium, holmium, erbium, ytterbium, terbium, thulium and lutetium; α is a numeral in the range of 0.005 to 0.040; k is a numeral in the range of 1.00 to 1.05; x is a numeral in the range of 0.01 to 0.10; and y is a numeral greater than 0 and not greater than 0.04; and from 0.2 to 5.0 parts by weight of an additive mixture of at least two members selected from the group consisting of boric oxide or lithium oxide, silicon oxide and at least one metal oxide selected form the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide; (b) molding the mixture into desired shape and size, the molding having at least two electrode portions of an electroconductive material; (c) cosintering the molding and the electrode portions to maturity in a nonoxidative atmosphere; and (d) heating the cosintered molding and electrode portions in an oxidative atmosphere.

Claim 9

Dependent Claim 214 words

A process for the manufacture of a solid dielectric capacitor which comprises: (a) providing in finely divided form a mixture of: 100 parts by weight of a major ingredient expressed by the formula, (1-α){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+αCaZrO.sub.3 where M is either or both of magnesium and zinc; R is at least one metal selected from scandium, yttrium, gadolinium, dysprosium, holmium, erbium, ytterbium, terbium, thulium and lutetium; α is a numeral in the range of 0.005 to 0.040; k is a numeral in the range of 1.00 to 1.05; x is a numeral in the range of 0.01 to 0.10; and y is a numeral greater than 0 and not greater than 0.04; and from 0.2 to 5.0 parts by weight of an additive mixture of at least two members selected from the group consisting of boric oxide or lithium oxide, silicon oxide and at least one metal oxide selected form the group consisting of barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide; (b) molding the mixture into desired shape and size, the molding having at least two electrode portions of an electroconductive material; (c) cosintering the molding and the electrode portions to maturity in a nonoxidative atmosphere; and (d) heating the cosintered molding and electrode portions in an oxidative atmosphere.

Claim 10

Dependent Claim 28 words

The process of claim 7 wherein the electrode portions are formed on the molding by coating the same with an electroconductive paste composed principally of a base metal.

Claim 11

Dependent Claim 11 words

The process of claim 8 wherein the base metal is nickel.

Claim 12

Dependent Claim 25 words

The process of claim 7 wherein the molding and the electrode portions are cosintered in a temperature range of 1050 degrees to 1200 degrees C.

Claim 13

Dependent Claim 25 words

The process of claim 7 wherein the cosintered molding and electrode portions are heated in a temperature range of 500 degrees to 1000 degrees C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-02-17	1995-08-19	1996-02-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-02-17	1999-08-19	2000-02-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-02-17	2003-08-19	2004-02-18	$7700.00	Window Closed / Lapsed

Solid dielectric capacitor and method of manufacture

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