US5001086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered glass-ceramic body and method
Assignee: Corning Inc
•
Filing: 1989-10-26
•
Granted: 1991-03-19
•
Expires: 2009-10-26
Abstract
Abstract There is disclosed a sintered, alpha-cordierite solid solution glass-ceramic body in which the properties of coefficient of thermal expansion and modulus of rupture are stabilized and controlled by using a combination of two dopants in the glass during sintering and crystallization. There is further disclosed the method of producing such bodies, and controlling such properties, through the use of the two dopants.
Inventors
- 👤 Gerald B. Carrier
- 👤 Gaylord L. Francis
- 👤 Robert J. Paisley
- 👤 Donald M. Trotter, Jr.
- 👤 Kathleen A. Wexell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:04
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A sintered, alpha-cordierite solid solution, glass-ceramic body having controlled CTE and MOR values, having a primary crystal phase with an alpha-cordierite structure and having, in its composition, a ZnO content sufficient to form a secondary crystal phase with a gahnite structure, the relative amounts of the alpha-cordierite and gahnite crystal phases, as shown by XRD peaks, being in the range of about 4:1 to 6:1.
Claim 2
Dependent Claim
65 words
A sintered, alpha-cordierite solid solution, glass-ceramic body having controlled CTE and MOR values, having a primary crystal phase with an alpha-cordierite structure and having, in its composition, a ZnO content sufficient to form a secondary crystal phase with a gahnite structure, the relative amounts of the alpha-cordierite and gahnite crystal phases, as shown by XRD peaks, being in the range of about 4:1 to 6:1.
Claim 3
Dependent Claim
30 words
A sintered, alpha-cordierite glass-ceramic solid solution body in accordance with claim 1 wherein the relative amounts of alpha-cordierite and gahnite crystal phases are about 5:1, as shown by XRD peaks.
Claim 4
Dependent Claim
111 words
A sintered, alpha-cordierite solid solution glass-ceramic body in accordance with claim 1 wherein the chemical composition of the precursor glass, calculated in percent by weight on the oxide basis, consists essentially of 2-18% MgO, up to 21% ZnO, the ZnO content being sufficient to form a secondary gahnite crystal phase when the glass is crystallized, the total MgO+ZnO being 10-25%, 20-38% Al 2 O 3 , 40-52% SiO 2 and 2-15% of at least one oxide selected from up to 8% K 2 O and/or Rb 2 O and/or Cs 2 O, up to 10% CaO and/or SrO and/or BaO and/or PbO, and up to 5% B 2 O 3 .
Claim 5
Dependent Claim
40 words
A sintered, alpha-cordierite solid solution glass-ceramic body in accordance with claim 3 wherein the precursor glass consists of 51% SiO 2 , 24.8% Al 2 O 3 , 13.1% MgO, 3.1% BaO, 1.4% B 2 O 3 and 6.6% ZnO.
Claim 6
Dependent Claim
19 words
A sintered, alpha-cordierite solid solution glass-ceramic body in accordance with claim 1 containing 0.5-5% TiO 2 as an additive.
Claim 7
Dependent Claim
18 words
A sintered, alpha-cordierite solid solution glass-ceramic body in accordance with claim 5 containing about 2% TiO 2 .
Claim 8
Dependent Claim
39 words
A sintered, alpha-cordierite solid solution glass-ceramic body in accordance with claim 1 wherein the body has a coefficient of thermal expansion in the range of 26-30×10 -7 /° C. and a modulus of rupture of at least 25 Kpsi.
References Cited (Backward Citations)
US3450456A
Cited
US4540671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |