US4894273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding additives for refractory metallization inks
Assignee: CPS Technologies Corp
•
Filing: 1988-06-16
•
Granted: 1990-01-16
•
Expires: 2008-06-16
Abstract
Abstract Bonding additives for refractory metallization compositions allow for circuit traces having good resistivities and adhesion values in excess of 6 kpsi, generally between about 10 and 20 kpsi. The inks are provided in formulations devoid of a glass component, and are suitable for co-sintering circuit traces and vias with 96% alumina substrates, and especially for 99% alumina substrates. Suitable bonding additives are the oxides of molybdenum, tungsten, niobium, manganese, yttrium, and titanium, or mixtures of such oxides.
Inventors
- 👤 Sheldon I. Lieberman
- 👤 Eric A. Barringer
- 👤 Brian C. Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:14
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/03; H05K1/0306; H05K3/00; H05K3/40; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
61 words
A ceramic body essentially devoid of glass and composed of >96% alumina and having co-sintered metallization, the metallization derived from a composition having a metallizing portion consisting essentially of 84-97% refractory metal, 2-10% alumina, 0.05-5% sintering aid, and 0.5-5% bonding additive selected from the group consisting of the oxides or molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides.
Claim 2
Dependent Claim
61 words
A ceramic body essentially devoid of glass and composed of >96% alumina and having co-sintered metallization, the metallization derived from a composition having a metallizing portion consisting essentially of 84-97% refractory metal, 2-10% alumina, 0.05-5% sintering aid, and 0.5-5% bonding additive selected from the group consisting of the oxides or molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides.
Claim 3
Dependent Claim
31 words
The ceramic body as defined by claim 1, wherein the metallization is a circuit trace and consists essentially of 88-97% refractory metal, 2-8% alumina, 0.05-1% sintering aid, and 0.5-3% bonding additive.
Claim 4
Dependent Claim
30 words
The ceramic body as defined by claim 1, wherein the metallization is a via and consists essentially of 84-97% refractory metal, 2-10% alumina, 0.05-5% sintering aid, and 0.5-5% bonding additive.
Claim 5
Dependent Claim
18 words
The ceramic body as defined by claim 1, wherein the refractory metal is tungsten, molybdenum, or mixtures thereof.
Claim 6
Dependent Claim
23 words
The ceramic body as defined by claim 1, wherein the sintering aid is nickel, cobalt, palladium, manganese, an oxide thereof, or mixtures thereof.
Claim 7
Dependent Claim
16 words
The ceramic body as defined by claim 1, wherein the ceramic is at least 98% alumina.
Claim 8
Dependent Claim
16 words
The ceramic body as defined by claim 6, wherein the ceramic is at least 99% alumina.
Claim 9
Dependent Claim
20 words
The ceramic body as defined by claim 1, wherein the sintering aid is present in an amount of approximately 0.05-0.50%.
Claim 10
Dependent Claim
22 words
The ceramic body as defined by claim 1, wherein the co-sintered metallization defines a trace pattern on a surface of the body.
Claim 11
Dependent Claim
18 words
The ceramic body as defined by claim 1, wherein the co-sintered metallization defines a via through the body.
Claim 12
Dependent Claim
19 words
The ceramic body as defined by claim 1, wherein the body is composed of at least two ceramic layers.
Claim 13
Dependent Claim
19 words
The ceramic body as defined by claim 11, wherein at least two of the ceramic layers have co-sintered metallization.
Claim 14
Dependent Claim
47 words
A metallization composition, comprising: (a) a metallization portion consisting essentially of: 84-97% refractory metal, 2-10% alumina, 0.05-5% sintering aid, 0.5-5% bonding additives elected from the group consisting of the oxides or molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides; and (b) an organic vehicle.
Claim 15
Dependent Claim
47 words
A metallization composition, comprising: (a) a metallization portion consisting essentially of: 84-97% refractory metal, 2-10% alumina, 0.05-5% sintering aid, 0.5-5% bonding additives elected from the group consisting of the oxides or molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides; and (b) an organic vehicle.
Claim 16
Dependent Claim
27 words
The metallization composition as defined by claim 13, wherein the metallization portion consists essentially of: 8-97% refractory metal; 2-8% alumina; 0.05-1% sintering aid; and 0.5-3% bonding additive.
Claim 17
Dependent Claim
30 words
The metallization composition as defined by claim 13, wherein the metallization is in the form of an ink having a viscosity of less than about 100,000 cps at 1 rpm.
Claim 18
Dependent Claim
25 words
The metallization composition as defined by claim 13, where the metallization portion provides a solids loading of from about 25% to about 50% by volume.
Claim 19
Dependent Claim
21 words
The metallization composition as defined by claim 16, wherein the solids loading is from about 40% to about 45% by volume.
Claim 20
Dependent Claim
23 words
The metallization composition as defined by claim 13, wherein the sintering aid is nickel, cobalt, palladium, manganese, an oxide thereof, or mixtures thereof.
Claim 21
Dependent Claim
74 words
A ceramic composite, comprising: (a) a ceramic substrate having not more than about 1 wt. % glass; and (b) a metallized path suitable for a circuit trace or a via, the path consisting essentially of 84-97 wt. % refractory metal, 2-10 wt. % alumina, ≦5 wt. % sintering aid, and 0.5-5 wt. % bonding additives elected form the group consisting of oxides of molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides.
Claim 22
Dependent Claim
74 words
A ceramic composite, comprising: (a) a ceramic substrate having not more than about 1 wt. % glass; and (b) a metallized path suitable for a circuit trace or a via, the path consisting essentially of 84-97 wt. % refractory metal, 2-10 wt. % alumina, ≦5 wt. % sintering aid, and 0.5-5 wt. % bonding additives elected form the group consisting of oxides of molybdenum, tungsten, niobium, manganese, yttrium, titanium and mixtures of such oxides.
Claim 23
Dependent Claim
23 words
The composite defined by claim 19, wherein the substrate is selected from those essentially composed of aluminum oxide, aluminum nitride, and beryllium oxide.
References Cited (Backward Citations)
US4340618A
Cited
US4684446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |