US4259061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of achieving uniform sintering shrinkage in a laminated planar green ceramic substrate and apparatus therefor
Assignee: International Business Machines Corp
•
Filing: 1979-12-07
•
Granted: 1981-03-31
•
Expires: 1999-12-07
Abstract
Abstract A method of achieving uniform shrinkage of a laminated green ceramic substrate during sintering wherein the substrate is placed on a flat, relatively thick plate of refractory material such as molybdenum, tantalum or tungsten or alloys thereof with the flat plate provided with a thin surface coating layer of a ceramic material, and heating the substrate to a sintering temperature and maintaining the temperature for a time sufficient to sinter the substrate. A setter plate for supporting a planar green ceramic substrate during the sintering operation, the setter plate is made of a refractory material and provided with a thin ceramic coating at least on the top surface.
Inventors
- 👤 Derry J. Dubetsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A method of achieving uniform shrinkage of a green ceramic substrate during sintering comprising providing a flat, relatively thick plate of a refractory metal selected from the group consisting of Mo, W and Ta, and alloys thereof, said plate having a thin surface coating layer of ceramic material on at least the top surface thereof, placing the ceramic substrate to be sintered on the said plate of a refractory metal in contact with said surface coating of ceramic material, and heating the substrate to a sintering temperature and maintaining the temperature for a time sufficient to sinter the substrate.
Claim 2
Independent Claim
99 words
A method of achieving uniform shrinkage of a green ceramic substrate during sintering comprising providing a flat, relatively thick plate of a refractory metal selected from the group consisting of Mo, W and Ta, and alloys thereof, said plate having a thin surface coating layer of ceramic material on at least the top surface thereof, placing the ceramic substrate to be sintered on the said plate of a refractory metal in contact with said surface coating of ceramic material, and heating the substrate to a sintering temperature and maintaining the temperature for a time sufficient to sinter the substrate.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said sintering temperature is in the range of 1250° to 1650° C.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein said thin surface coating layer is Al 2 O 3 with a thickness in the range of 0.08 to 0.125 mm.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein said coating layer has a surface roughness in the range of 3 to 6 mm.
Claim 6
Dependent Claim
71 words
A setter plate for supporting a planar green ceramic substrate during a sintering operation, which plate minimizes shrinkage distortion comprising a flat plate of refractory metal selected from the group consisting of Mo, Ta, W and high temperature alloys which include major proportions of refractory metals, a thin ceramic coating on at least the top work supporting surface of said flat plate for supporting a ceramic substrate during a sintering operation.
Claim 7
Dependent Claim
71 words
A setter plate for supporting a planar green ceramic substrate during a sintering operation, which plate minimizes shrinkage distortion comprising a flat plate of refractory metal selected from the group consisting of Mo, Ta, W and high temperature alloys which include major proportions of refractory metals, a thin ceramic coating on at least the top work supporting surface of said flat plate for supporting a ceramic substrate during a sintering operation.
Claim 8
Dependent Claim
22 words
The setter plate of claim 5 wherein said ceramic layer has a surface roughness in the range of 3 to 6 mm.
Claim 9
Dependent Claim
16 words
The setter plate of claim 6 wherein said ceramic layer is Al 2 O 3 .
Claim 10
Dependent Claim
22 words
The setter plate of claim 6 wherein the thickness of said ceramic layer is in the range of 0.08 to 0.125 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |