US4536328A
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US
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Electrical resistance compositions and methods of making the same
Assignee: Heraeus Cermalloy Inc
•
Filing: 1984-05-30
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Granted: 1985-08-20
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Expires: 2004-05-30
Abstract
Abstract A composition for making electrical resistance elements including a conductive component which comprises (a) a precious metal oxide of the formula A' 1-x A" x B' 1-y B" y O 3 , wherein when A' is Sr; A" is one or more of Ba, La, Y, Ca and Na, and when A' is Ba, A" is one or more of Sr, La, Y, Ca and Na; B' is Ru; B" is one or more of Ti, Cd, Zr, V and Co, O<x<0.2; O<y<0.2; (b) a binder component which comprises (i) between 40 weight percent and 75 weight percent C', wherein C' is SrO when A' is Sr, C' is BaO when A' is Ba, and C' is SrO+BaO when A' is Sr and A" is Ba and when A' is Ba and A" is Sr, (ii) between 20 weight percent and 35 weight percent B 2 O 3 , (iii) between 2 weight percent and 12 weight percent SiO 2 , and (iv) between 0.5 weight percent and 6.5 weight percent ZnO. The method of the present invention includes mixing the conductive component and binder as described above with an organic vehicle.
Inventors
- 👤 Dana L. Hankey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:17
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/0658; H01C17/06513; H01C17/06533; H01C17/0654; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
195 words
A composition for making electrical resistance elements comprising: a. a conductive component which comprises a precious metal oxide of the formula A' 1-x A" x B' 1-y B" y O 3 wherein A' is Sr or Ba, when A' is Sr, A" is selected from the group consisting of one or more of Ba, La, Y, Ca and Na, and when A' is Ba, A" is selected from the group consisting of one or more of Sr, La, Y, Ca and Na; B' is Ru; B" is selected from the group consisting of one or more of Ti, Cd, Zr, V and Co; O<x<0.2; and O<y<0.2; b. a binder component which comprises (i) between 40 weight percent and 75 weight percent C', wherein C' is SrO when A' is Sr, C' is BaO when A' is Ba, and C' is SrO+BaO when A' is Sr and A" is Ba and when A' is Ba and A" is Sr, (ii) between 20 weight percent and 35 weight percent B 2 O 3 , (iii) between 2 weight percent and 15 weight percent SiO 2 , and (iv) between 0.5 weight percent and 6.5 weight percent ZnO.
Claim 2
Dependent Claim
195 words
A composition for making electrical resistance elements comprising: a. a conductive component which comprises a precious metal oxide of the formula A' 1-x A" x B' 1-y B" y O 3 wherein A' is Sr or Ba, when A' is Sr, A" is selected from the group consisting of one or more of Ba, La, Y, Ca and Na, and when A' is Ba, A" is selected from the group consisting of one or more of Sr, La, Y, Ca and Na; B' is Ru; B" is selected from the group consisting of one or more of Ti, Cd, Zr, V and Co; O<x<0.2; and O<y<0.2; b. a binder component which comprises (i) between 40 weight percent and 75 weight percent C', wherein C' is SrO when A' is Sr, C' is BaO when A' is Ba, and C' is SrO+BaO when A' is Sr and A" is Ba and when A' is Ba and A" is Sr, (ii) between 20 weight percent and 35 weight percent B 2 O 3 , (iii) between 2 weight percent and 15 weight percent SiO 2 , and (iv) between 0.5 weight percent and 6.5 weight percent ZnO.
Claim 3
Dependent Claim
10 words
A composition according to claim 1, wherein A' is Sr.
Claim 4
Dependent Claim
10 words
A composition according to claim 1, wherein A' is Ba.
Claim 5
Dependent Claim
22 words
A composition according to claim 1, wherein said binder further comprises between 0.1 and 2.5 weight percent Al 2 O 3 .
Claim 6
Dependent Claim
44 words
A composition according to claim 1, wherein C' is between 42 and 58 weight percent, B 2 O 3 is between 27 and 31 weight percent, SiO 2 is between 7 and 11 weight percent and ZnO is between 2 and 4 weight percent.
Claim 7
Dependent Claim
45 words
A composition according to claim 1 wherein said binder further comprises between about 0.1 weight percent and 1.5 weight percent each of one or more oxides selected from the group consisting of Bi 2 O 3 , CuO, MgO, and Nb 2 O 5 .
Claim 8
Dependent Claim
22 words
A composition according to claim 1, wherein said binder further comprises between 0.1 weight percent and 1.5 weight percent TiO 2 .
Claim 9
Dependent Claim
20 words
A composition according to claim 1, wherein said binder further comprises between 0.1 weight percent and 1.5 weight percent NaF.
Claim 10
Dependent Claim
20 words
A composition according to claim 1, wherein said binder further comprises between 5 weight percent and 15 weight percent CaO.
Claim 11
Dependent Claim
74 words
A composition according to claim 1, wherein said binder includes 51.7 weight percent SrO, 30.0 weight percent B 2 O 3 , 10.5 weight percent SiO 2 , 1.1 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO, 0.5 weight percent Nb 2 O 5 , 0.5 weight percent TiO 2 and 0.5 weight percent NaF.
Claim 12
Dependent Claim
75 words
A composition according to claim 1, wherein said binder includes 55.2 weight percent SrO, 30.0 weight percent B 2 O 3 , 7.0 weight percent SiO 2 , 1.1 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO, 0.5 weight percent Nb 2 O 5 , 0.5 weight percent NaF an 0.5 weight percent TiO 2 .
Claim 13
Dependent Claim
65 words
A composition according to claim 1, wherein said binder includes 56.6 weight percent SrO, 30.1 weight percent B 2 O 3 , 7.1 weight percent SiO 2 , 0.5 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO and 0.5 weight percent Nb 2 O 5 .
Claim 14
Dependent Claim
125 words
A composition according to claim 1, wherein said conductive component is selected from the group consisting of SrRuO 3 , SrRu 0 .8 Ti 0 .2 O 3 , SrRu 0 .9 Ti 0 .1 O 3 , SrRu 0 .95 Cd 0 .05 O 3 , Sr 0 .9 Ba 0 .1 RuO 3 , Sr 0 .9 Y 0 .1 RuO 3 , Sr 0 .8 Na 0 .1 La 0 .1 RuO 3 , SrRu 0 .8 Zr 0 .2 O 3 , SrRu 0 .9 Zr 0 .1 O 3 , SrRu 0 .75 V 0 .25 O 3 , SrRu 0 .8 Co 0 .2 O 3 and SrRu 0 .8 Ti 0 .1 Zr 0 .1 O 3 .
Claim 15
Dependent Claim
11 words
A composition according to claim 1, further comprising an organic vehicle.
Claim 16
Dependent Claim
21 words
A composition according to claim 14, wherein said organic vehicle is a mixture of an acrylic ester resin and an alcohol.
Claim 17
Dependent Claim
18 words
A composition according to claim 15, wherein said resin is isobutyl methacrylate and said alcohol is tri-decyl alcohol.
Claim 18
Independent Claim
226 words
A method of forming an electrical resistance element comprising preparing a composition for making electrical resistance elements comprising combining a. a conductive component which comprises a precious metal oxide of the formula A' 1-x A" x B' 1-y B" y O 3 wherein A' is Sr or Ba, when A' is Sr, A" is selected from the group consisting of one or more of Ba, La, Y, Ca and Na and when A' is Ba, A" is selected from the group consisting of one or more Sr, La, Y, Ca and Na; and B' is Ru; B" is selected from the group consisting of one or more of Ti, Cd, Zr, V and Co; O<x<0.2; and O<y<0.2, b. a binder component which comprises (i) between 40 weight percent and 75 weight percent C', wherein C' is SrO when A' is Sr, C' is BaO when A' is Ba, and C' is SrO+BaO when A' is Sr and A" is Ba and when A' is Ba and A" is Sr, (ii) between 25 weight percent and 35 weight percent B 2 O 3 , (iii) between 2 weight percent and 12 weight percent SiO 2 , and (iv) between 0.5 weight percent and 6.5 weight percent ZnO, and c. an organic vehicle to form a paste, thereafter screen printing the paste on a substrate and conducting firing.
Claim 19
Independent Claim
226 words
A method of forming an electrical resistance element comprising preparing a composition for making electrical resistance elements comprising combining a. a conductive component which comprises a precious metal oxide of the formula A' 1-x A" x B' 1-y B" y O 3 wherein A' is Sr or Ba, when A' is Sr, A" is selected from the group consisting of one or more of Ba, La, Y, Ca and Na and when A' is Ba, A" is selected from the group consisting of one or more Sr, La, Y, Ca and Na; and B' is Ru; B" is selected from the group consisting of one or more of Ti, Cd, Zr, V and Co; O<x<0.2; and O<y<0.2, b. a binder component which comprises (i) between 40 weight percent and 75 weight percent C', wherein C' is SrO when A' is Sr, C' is BaO when A' is Ba, and C' is SrO+BaO when A' is Sr and A" is Ba and when A' is Ba and A" is Sr, (ii) between 25 weight percent and 35 weight percent B 2 O 3 , (iii) between 2 weight percent and 12 weight percent SiO 2 , and (iv) between 0.5 weight percent and 6.5 weight percent ZnO, and c. an organic vehicle to form a paste, thereafter screen printing the paste on a substrate and conducting firing.
Claim 20
Dependent Claim
10 words
A method according to claim 17, wherein A' is Sr.
Claim 21
Dependent Claim
10 words
A method according to claim 17, wherein A' is Ba.
Claim 22
Dependent Claim
35 words
A method according to claim 17, wherein said binder further comprises between 0.1 and 2.5 weight percent, SiO 2 is between 2 and 15 weight percent and ZnO is between 0.5 and 6.5 weight percent.
Claim 23
Dependent Claim
44 words
A method according to claim 17, wherein A'O is between 42 and 58 weight percent, B 2 O 3 is between 27 and 31 weight percent, SiO 2 is between 2 and 15 weight percent and ZnO is between 0.5 and 6.5 weight percent.
Claim 24
Dependent Claim
44 words
A method according to claim 17 wherein said binder further conprises between about 0.1 weight percent and 1.5 weight percent each of one or more oxides of the group consisting of Bi 2 O 3 , CuO, MgO, and Nb 2 O 5 .
Claim 25
Dependent Claim
22 words
A method according to claim 17, wherein said binder further comprises between 0.1 weight percent and 1.5 weight percent TiO 2 .
Claim 26
Dependent Claim
20 words
A method according to claim 17, wherein said binder further comprises between 0.1 weight percent and 1.5 weight percent NaF.
Claim 27
Dependent Claim
20 words
A method according to claim 17, wherein said binder further comprises between 5 weight percent and 15 weight percent CaO.
Claim 28
Dependent Claim
74 words
A method according to claim 17, wherein said binder includes 51.7 weight percent SrO, 30.0 weight percent B 2 O 3 , 10.5 weight percent SiO 2 , 1.1 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO, 0.5 weight percent Nb 2 O 5 , 0.5 weight percent TiO 2 and 0.5 weight percent NaF.
Claim 29
Dependent Claim
74 words
A method according to claim 17, wherein said binder includes 55.2 weight percent SrO, 30.0 weight percent B 2 O 3 ,7.0 weight percent SiO 2 , 1.1 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO, 0.5 weight percent Nb 2 O 5 , 0.5 weight percent NaF and 0.5 weight percent TiO 2 .
Claim 30
Dependent Claim
65 words
A method according to claim 18, wherein said binder includes 56.6 weight percent SrO, 30.1 weight percent B 2 O 3 , 7.1 weight percent SiO 2 , 0.5 weight percent Al 2 O 3 , 3.4 weight percent ZnO, 0.5 weight percent Bi 2 O 3 , 0.6 weight percent CuO, 0.7 weight percent MgO and 0.5 weight percent Nb 2 O 5 .
Claim 31
Dependent Claim
125 words
A method according to claim 18, wherein said conductive component is selected from the group consisting of SrRuO 3 , SrRu 0 .8 Ti 0 .2 O 3 , SrRu 0 .9 Ti 0 .1 O 3 , SrRu 0 .95 Cd 0 .05 O 3 , Sr 0 .9 Ba 0 .1 RuO 3 , Sr 0 .9 Y 0 .1 RuO 3 , Sr 0 .8 Na 0 .1 La 0 .1 RuO 3 , SrRu 0 .8 Zr 0 .2 O 3 , SrRu 0 .9 Zr 0 .1 O 3 , SrRu 0 .75 V 0 .25 O 3 , SrRu 0 .8 Co 0 .2 O 3 and SrRu 0 .8 Ti 0 .1 Zr 0 .1 O 3 .
Claim 32
Dependent Claim
21 words
A method according to claim 17, wherein said organic vehicle is a mixture of an acrylic ester resin and an alcohol.
Claim 33
Dependent Claim
18 words
A method according to claim 29, wherein said resin is isobutyl methacrylate and said alcohol is tri-decyl alcohol.
Claim 34
Dependent Claim
15 words
A method according to claim 17, wherein prior to screen printing, the paste is milled.
Claim 35
Dependent Claim
14 words
A method according to claim 17, wherein the screen printing is on Cu termination.
Claim 36
Dependent Claim
15 words
A method according to claim 17, wherein the substrate comprises Al 2 O 3 .
Claim 37
Dependent Claim
15 words
A method according to claim 17, wherein the firing is conducted in a nitrogen atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |