US4585580A
Expired / Lapsed
US
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Thick film copper compatible resistors based on hexaboride conductors and nonreducible glasses
Assignee: EIDP Inc
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Filing: 1978-08-16
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Granted: 1986-04-29
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Expires: 1998-08-16
Abstract
Abstract Thick flim resistors and conductors compatible with copper and fireable in nonoxidizing atmosphere are provided. The resistors are based on certain hexaboride conductors such as LaB6 and glasses which are thermodynamically stable to or nonreducible by the hexaborides. Thick film pastes prepared with small particle size hexaboride and certain ethylene-vinyl acetate polymeric vehicles afford resistors having improved temperature coefficient of resistance and coefficient of variation.
Inventors
- 👤 Paul C. Donohue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:44
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06566; H10; H10D; H10D86/00; H10D86/80; H10D86/85
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
134 words
A thick film composition consisting essentially of inorganic powder solids content dispersed in an organic vehicle wherein the solids content consists essentially of: A. 10-95 parts by weight, based on the weight of solids, of conductive material selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 and SrB 6 ; and B. 90-5 parts by weight, based on the weight of solids, of at least 98 mole %, based on the mole % of the oxide components of the glass, of nonreducible glass, each component having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule; wherein the composition is compatible with copper conductors and is fireable in substantially nonoxidizing atmosphere.
Claim 2
Dependent Claim
134 words
A thick film composition consisting essentially of inorganic powder solids content dispersed in an organic vehicle wherein the solids content consists essentially of: A. 10-95 parts by weight, based on the weight of solids, of conductive material selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 and SrB 6 ; and B. 90-5 parts by weight, based on the weight of solids, of at least 98 mole %, based on the mole % of the oxide components of the glass, of nonreducible glass, each component having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule; wherein the composition is compatible with copper conductors and is fireable in substantially nonoxidizing atmosphere.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein said conductive material is LaB 6 .
Claim 4
Dependent Claim
17 words
The composition of claim 2 wherein the average particle size of LaB 6 is below 1 micron.
Claim 5
Dependent Claim
16 words
The composition of claim 3 wherein the average particle size of LaB 6 is 0.055-0.32 micron.
Claim 6
Dependent Claim
74 words
The composition of claim 1 wherein said nonreducible glass is based on nonreduciole oxides selected from the group consisting of CaO, ThO 2 , BeO, La 2 O 3 , SrO, MgO, Y 2 O 3 , rare earth oxides, Sc 2 O 3 , BaO, HfO 2 , ZrO 2 , Al 2 O 3 , Li 2 O, TiO 2 , CeO 2 , SiO 2 and B 2 O 3 .
Claim 7
Dependent Claim
62 words
The composition of claim 1 wherein said nonreducible glass contains 10-30 mole % of at least one of CaO, BaO and SrO; 35-55 mole % of SiO 2 ; 20-35 mole % of B 2 O 3 ; 5-15 mole % of Al 2 O 3 ; 0-4 mole % of ZrO 2 ; and 0-1 mole % of TiO 2 .
Claim 8
Dependent Claim
17 words
The composition of claim 6 wherein the oxide present at the 10-30 mole % level is CaO.
Claim 9
Dependent Claim
142 words
A thick film composition consisting essentially of inorganic powder solids content dispersed in an organic vehicle wherein the weight ratio of solids content to vehicle is from 1:2 to 20:1 and wherein the solids content consists essentially of A. 10-95 parts weight, based on the weight of solids, of LaB 6 having an average particles size below 1 micron; and B. 90-5 parts by weight, based on the weight of solids, of at least 98% mole %, based on the mole % of the oxide components of the glass, of nonreducible glass containing 10-30 mole % of at least one of CaO, BaO and SrO; 35-55 mole % of SiO 2 20-35 mole % of B 2 O 3 ; 5-15 mole % of Al 2 O 3 ; 0-4 mole % of ZrO 2 ; and 0-1 mole % of TiO.
Claim 10
Dependent Claim
142 words
A thick film composition consisting essentially of inorganic powder solids content dispersed in an organic vehicle wherein the weight ratio of solids content to vehicle is from 1:2 to 20:1 and wherein the solids content consists essentially of A. 10-95 parts weight, based on the weight of solids, of LaB 6 having an average particles size below 1 micron; and B. 90-5 parts by weight, based on the weight of solids, of at least 98% mole %, based on the mole % of the oxide components of the glass, of nonreducible glass containing 10-30 mole % of at least one of CaO, BaO and SrO; 35-55 mole % of SiO 2 20-35 mole % of B 2 O 3 ; 5-15 mole % of Al 2 O 3 ; 0-4 mole % of ZrO 2 ; and 0-1 mole % of TiO.
Claim 11
Dependent Claim
94 words
An electrical resistive material which is stable in a nonoxidizing firing atmosphere, comprising a mixture of glass frit and metal hexaboride selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 , and SrB 6 , characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metaloxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 12
Dependent Claim
94 words
An electrical resistive material which is stable in a nonoxidizing firing atmosphere, comprising a mixture of glass frit and metal hexaboride selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 , and SrB 6 , characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metaloxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 13
Dependent Claim
18 words
An electrical resistive material as claimed in claim 9, characterized in that the glass is a calcium boroaluminate.
Claim 14
Dependent Claim
34 words
An electrical resistive material as claimed in claim 9 or claim 10, characterized in that it contains a mixture of hexaborides of a divalent metal and of a metal which is at least trivalent.
Claim 15
Dependent Claim
29 words
An electrical resistive material as claimed in claim 9 or claim 10, characterized in that the glass has present therein less than 2 mole % of reducible metal oxide.
Claim 16
Dependent Claim
26 words
An electrical resistive material as claimed in claim 11 characterized in that the glass has present therein less than 2 mole % of reducible metal oxide.
Claim 17
Dependent Claim
31 words
An electrical resistive material as claimed in claim 9 or claim 10 characterized in that the glass has present therein less than 2 mole % of Bi 2 O 3 .
Claim 18
Dependent Claim
28 words
An electrical resistive material as claimed in claim 11 characterized in that the glass has present therein less than 2 mole % of Bi 2 O 3 .
Claim 19
Dependent Claim
23 words
A screen printing paste produced by dispersing the electrical resistive material as claimed in claim 9 or claim 10 in an organic vehicle.
Claim 20
Dependent Claim
20 words
A screen printing paste produced by dispersing the electrical resistive material as claimed in claim 11 in an organic vehicle.
Claim 21
Dependent Claim
20 words
A screen printing paste produced by dispersing the electrical resisitive material as claimed in claim 12 in an organic vehicle.
Claim 22
Dependent Claim
20 words
A screen printing paste produced by dispersing the electrical resistive material as claimed in claim 13 in an organic vehicle.
Claim 23
Dependent Claim
20 words
A screen printing paste produced by dispersing the electrical resistive material as claimed in claim 14 in an organic vehicle.
Claim 24
Dependent Claim
21 words
A screen printing paste as claimed in claim 16 wherein the vehicle consists of a solution of ethyl cellulose in terpineol.
Claim 25
Dependent Claim
21 words
A screen printing paste as claimed in claim 17 wherein the vehicle consists of a solution of ethyl cellulose in terpineol.
Claim 26
Dependent Claim
21 words
A screen printing paste as claimed in claim 18 wherein the vehicle consists of a solution of ethyl cellulose in terpineol.
Claim 27
Dependent Claim
21 words
A screen printing paste as claimed in claim 19 wherein the vehicle consists of a solution of ethyl cellulose in terpineol.
Claim 28
Dependent Claim
21 words
A screen printing paste as claimed in claim 20 wherein the vehicle consists of a solution of ethyl cellulose in terpineol.
Claim 29
Dependent Claim
29 words
A substrate bearing a screen printed film produced by firing a paste as claimed in claim 16 in a nonoxidizing atmosphere at a peak temperature of approximately 910° C.
Claim 30
Dependent Claim
29 words
A substrate bearing a screen printed film produced by firing the paste as claimed in claim 17 in a nonoxidizing atmosphere at a peak temperature of approximately 910° C.
Claim 31
Dependent Claim
29 words
A substrate bearing a screen printed film produced by firing the paste as claimed in claim 18 in a nonoxidizing atmospheere at a peak temperature of approximately 910° C.
Claim 32
Dependent Claim
29 words
A substrate bearing a screen printed film produced by firing the paste as claimed in claim 19 in a nonoxidizing atmosphere at a peak temperature of approximately 910° C.
Claim 33
Dependent Claim
29 words
A substrate bearing a screen printed film produced by firing the paste as claimed in claim 28 in a nonoxidizing atmosphere at a peak temperature of approximately 910° C.
Claim 34
Dependent Claim
96 words
A screen printing paste produced by dispersing in an organic vehicle an electrical resistive material, containing a mixture of glass frit and metal hexaboride selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 , and SrB 6 , characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 35
Dependent Claim
96 words
A screen printing paste produced by dispersing in an organic vehicle an electrical resistive material, containing a mixture of glass frit and metal hexaboride selected from the group consisting of LaB 6 , YB 6 , rare earth hexaborides, CaB 6 , BaB 6 , and SrB 6 , characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 36
Dependent Claim
72 words
An electrical resistive material which is stable in a non-oxidizing firing atmosphere, containing a mixture of glass frit and divalent or trivalent metal hexaborides, characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 37
Dependent Claim
72 words
An electrical resistive material which is stable in a non-oxidizing firing atmosphere, containing a mixture of glass frit and divalent or trivalent metal hexaborides, characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 38
Dependent Claim
75 words
A screen printing paste produced by dispersing in an organic vehicle an electrical resistive material, containing a mixture of glass frit and divalent or trivalent metal hexaborides, characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
Claim 39
Dependent Claim
75 words
A screen printing paste produced by dispersing in an organic vehicle an electrical resistive material, containing a mixture of glass frit and divalent or trivalent metal hexaborides, characterized in that the glass is formed from component oxides having a Gibbs free energy of formation at 900° C. of less than approximately -78 kcal/mole per each metal-oxygen bond in the molecule comprising alkaline earth metal oxides, B 2 O 3 and Al 2 O 3 .
References Cited (Backward Citations)
GB1282023A
Cited
US3770478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |