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US 4,302,362 AGranted
Stable pyrochlore resistor compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsLewis C. Hoffman, Samuel J. Horowitz
Life of this patent
Estimating the term…
Abstract
Thick film resistors, based on pyrochlore conductive phase, glass, and refractory fillers having a thermal expansion coefficient range of 40.times.10.sup.-7 -60.times.10.sup.-7 /.degree. C. and low solubility in the glass, are provided. Such thick film resistor pastes afford resistors having excellent stability to mechanical or thermal stresses.
Claims20
A thick film resistor composition consisting essentially of:
- (A) 20-75 parts by weight, based on the weight of (A) plus (B) plus (C), of a conductive pyrochlore having the general formula
- (M.sub.x Bi.sub.2-x)(M'.sub.y M.increment..sub.2-y)O.sub.7-z
- wherein
- M is selected from the group consisting of yttrium, thallium, indium, cadmium, lead, copper and the rare earth metals;
- M' is selected from the group consisting of platinum, titanium, chromium, rhodium and antimony;
- M" is ruthenium, iridium or mixtures thereof;
- x is 0-2 with the proviso that, for monovalent copper, x.ltoreq.1;
- y is 0-0.5 with the proviso that y is 0-1 when M' is either rhodium or more than one of platinum, titanium, chromium, rhodium and antimony;
- and
- z is 0-1 with the proviso that it is at least equal to approximately x/2 when M is divalent lead or cadmium;
- (B) 12-75 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder having a coefficient of thermal expansion range of approximately 50-90.times.10.sup.-7 /.degree. C. and a coalescence temperature range of approximately 540.degree.-950.degree. C.;
- (C) 2-30 parts by weight, based on the weight of (A) plus (B) plus (C), of a refractory finely divided filler having a low solution rate in the glass binder, a coefficient of thermal expansion range of approximately 40-60.times.10.sup.-7 /.degree. C. and a particle size range of 0.1-3 nm with at least 90% by weight in the 0.3-1 nm range;
- and
- (D) an organic vehicle wherein the ratio of (A) plus (B) plus (C) to the vehicle is in the range of 2:1 to 6:1 by weight.
11 more elements
A thick film resistor composition consisting essentially of:
- (A) 23-70 parts by weight, based on the weight of (A) plus (B) plus (C), of a conductive pyrochlore having the general formula
- (M.sub.x Bi.sub.2-x)(M'.sub.y M".sub.2-y)O.sub.7-z
- wherein
- M is selected from the group consisting of yttrium, thallium, indium, cadmium, lead, copper and the rare earth metals;
- M' is selected from the group consisting of platinum, titanium, chromium, rhodium and antimony;
- M" is ruthenium, iridium or mixtures thereof;
- x is 0-2 with the proviso that, for monovalent copper, x.ltoreq.1;
- y is 0-0.5 with the proviso that y is 0-1 when M' is either rhodium or more than one of platinum, titanium, chromium, rhodium and antimony;
- and
- z is 0-1 with the proviso that it is at least equal to approximately x/2 when M is divalent lead or cadmium;
- (B) 28-65 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder having a coefficient of thermal expansion range of approximately 50-90.times.10.sup.-7 /.degree. C. and a coalescence temperature range of approximately 540.degree.-950.degree. C.;
- (C) 2-30 parts by weight, based on the weight of (A) plus (B) plus (C), of a refractory finely divided filler having a low solution rate in the glass binder, a coefficient of thermal expansion range of approximately 40-60.times.10.sup.-7 /.degree. C. and a particle size range of 0.1-3 nm with at least 90% by weight in the 0.3-1 nm range;
- and
- (D) an organic vehicle wherein the ratio of (A) plus (B) plus (C) to the vehicle is in the range of 2:1 to 6:1 by weight.
11 more elements
A thick film resistor composition consisting essentially of:
- (A) 23-70 parts by weight, based on the weight of (A) plus (B) plus (C), of a conductive pyrochlore having the general formula
- (M.sub.x Bi.sub.2-x)M".sub.2 O.sub.7=z
- wherein
- M is selected from the group consisting of yttrium, thallium, indium, cadmium, lead, copper and the rare earth metals;
- M" is ruthenium, iridium or mixtures thereof;
- x is 0-2 with the proviso that, for monovalent copper, x.ltoreq.1;
- z is 0-1 with the proviso that it is at least equal to approximately x/2 when M is divalent lead or cadmium;
- (B) 28-65 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder having a coefficient of thermal expansion range of approximately 50-90.times.10.sup.-7 /.degree. C. and a coalescence temperature range of approximately 540.degree.-950.degree. C.;
- (C) 2-30 parts by weight, based on the weight of (A) plus (B) plus (C), of a refractory finely divided filler having a low solution rage in the glass binder, a coefficient of thermal expansion range of approximately 40-60.times.10.sup.-7 /.degree. C. and a particle size range of 0.1-3 nm with at least 90% by weight in the 0.3-1 nm range;
- and
- (D) an organic vehicle wherein the ratio of (A) plus (B) plus (C) to the vehicle is in the range of 2:1 to 6:1 by weight.
8 more elements
A thick film resistor composition consisting essentially of:
- (A) approximately 25.5 parts by weight, based on the weight of (A) plus (B) plus (C), of bismuth ruthenate;
- (B) approximately 59.5 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder comprising 23-34 percent by weight of the binder of silica and 52-73 percent by weight of the binder of PbO;
- (C) approximately 15 parts by weight, based on the weight of (A) plus (B) plus (C), of zircon;
- and
- (D) organic vehicle based on ethyl cellulose in a weight ratio to the sum of (A) plus (B) plus (C) of 1:3.
2 more elements
A thick film resistor composition consisting essentially of:
- (A) approximately 25.4 parts by weight, based on the weight of (A) plus (B) plus (C), of lead ruthenate;
- (B) approximately 59.6 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder comprising 23-34 percent by weight of the binder of silica and 52-73 percent by weight of the binder of PbO;
- (C) approximately 15 parts by weight, based on the weight of (A) plus (B) plus (C), of zircon;
- and
- (D) organic vehicle based on ethyl cellulose in a weight ratio to the sum of (A) plus (B) plus (C) of 1:3.
2 more elements
A thick film resistor composition consisting essentially of:
- (A) 20-75 parts by weight, based on the weight of (A) plus (B) plus (C), of a conductive pyrochlore having the general formula
- (M.sub.x Bi.sub.2-x)M'.sub.y M".sub.2-y)O.sub.7-z
- wherein
- M is selected from the group consisting of yttrium, thallium, indium, cadmium, lead, copper and the rare earth metals;
- M' is selected from the group consisting of platinum, titanium, chromium, rhodium and antimony;
- M" is ruthenium, iridium or mixtures thereof;
- x is 0-2 with the proviso that, for monovalent copper, x.ltoreq.1;
- y is 0-0.5 with the proviso that y is 0-1 when M' is either rhodium or more than one of platinum, titanium, chromium, rhodium and antimony;
- and
- z is 0-1 with the proviso that it is at least equal to approximately x/2 when M is divalent lead or cadmium
- (B) 12-75 parts by weight, based on the weight of (A) plus (B) plus (C), of a glass binder having a coefficient of thermal expansion range of approximately 50-90.times.10.sup.-7 /.degree. C. and a coalescence temperature range of approximately 540.degree.-950.degree. C.;
- (C) 2-30 parts by weight, based on the weight of (A) plus (B) plus (C), of a refractory finely divided filler having a low solution rate in the glass binder, a coefficient of thermal expansion range of approximately 40-60.times.10.sup.-7 /.degree. C. and a particle size range of 0.1-3 nm with at least 90% by weight in the 0.3-1 nm range;
- wherein portions of pyrochlore (A), glass binder (B) and refractory filler (C) are presintered in various combinations;
- and
- (D) an organic vehicle wherein the ratio of (A) plus (B) plus (C) to the vehicle is in the range of 2:1 to 6:1 by weight.
12 more elements
Dependencies are inferred from the claim text.