US5250474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass powder which is crystallizable to yield a sintered glass ceramic containing hexagonal cordierite as the principal crystalline phase
Assignee: Schott AG
•
Filing: 1993-02-09
•
Granted: 1993-10-05
•
Expires: 2013-02-09
Abstract
Abstract A glass powder crystallizable to yield a sintered glass ceramic containing hexagonal cordierite as the principal crystal phase is of the composition, in mol % on an oxide basis, of 48-61 SiO2; 10-16 Al2O3; 23-35 MgO; 0-4 B2O3; 0-2.5 P2O5; 0.5-5 SIGMA B2O3+P2O5; 0-3 ZnO; 0-3 CaO; 0-1.5 BaO and as an essential component 0.5-12 F as a substitute for O. The glass powder may also contain a total of up to 3 mol % of one or more of the oxides PbO, SrO and SnO2. The glass powder can be crystallized at sintering temperatures below 970 DEG C. in a relatively broad sintering temperature range to yield a sintered glass ceramic having excellent and constant properties. It is particularly suitable for the production of electrotechnical and electronic components since it has very good electrical, dielectrical and mechanical properties. The sintering conditions can be varied within relatively broad limits without any adverse effect on the product obtained.
Inventors
- 👤 Friedrich Siebers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:10
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C10/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
Glass powder crystallizable to yield a sintered glass ceramic containing hexagonal cordierite as at least 50% by weight of resultant crystalline phase, said glass powder having a composition, in mol % on an oxide basis, consisting essentially of ______________________________________
48-61 SiO.sub.2 0-1.5 BaO 0-3 ZnO
10-16 Al.sub.2 O.sub.3
0-3 PbO 0-3 CaO
23-35 MgO 0-3 SrO
0-4 B.sub.2 O.sub.3
0-3 SnO.sub.2
0-2.5
P.sub.2 O.sub.5
0-3 Σ PbO +
SrO + SnO.sub.2
0.5-5 Σ B.sub.2 O.sub.3 + P.sub.2 O.sub.5
0.5-12 F as a
substitute for O.
______________________________________
Claim 2
Dependent Claim
86 words
Glass powder crystallizable to yield a sintered glass ceramic containing hexagonal cordierite as at least 50% by weight of resultant crystalline phase, said glass powder having a composition, in mol % on an oxide basis, consisting essentially of ______________________________________
48-61 SiO.sub.2 0-1.5 BaO 0-3 ZnO
10-16 Al.sub.2 O.sub.3
0-3 PbO 0-3 CaO
23-35 MgO 0-3 SrO
0-4 B.sub.2 O.sub.3
0-3 SnO.sub.2
0-2.5
P.sub.2 O.sub.5
0-3 Σ PbO +
SrO + SnO.sub.2
0.5-5 Σ B.sub.2 O.sub.3 + P.sub.2 O.sub.5
0.5-12 F as a
substitute for O.
______________________________________
Claim 3
Dependent Claim
54 words
Glass powder according to claim 1, consisting essentially of ______________________________________
51- 57 SiO.sub.2 0-3 PbO
12.5-15.5
Al.sub.2 O.sub.3
0-3 SrO
26-31 MgO 0-3 SnO.sub.2
0.5-2.5 P.sub.2 O.sub.5
0-3 Σ PbO + SrO + SnO.sub.2
0.3-2.0 B.sub.2 O.sub.3
1.0-3.0 Σ P.sub.2 O.sub.5 + B.sub.2 O.sub.3
0.3-2.5 ZnO
0.5-11.0
F as a
substitute for O.
______________________________________
Claim 4
Dependent Claim
19 words
Glass powder according to claim 1, said powder having a mean particle size of from 1 to 12 μm.
Claim 5
Dependent Claim
19 words
Glass powder according to claim 2, said powder having a mean particle size of from 1 to 12 μm.
Claim 6
Dependent Claim
13 words
Glass powder according to claim 2, having a particle size of 1.5-7 μm.
Claim 7
Independent Claim
90 words
A method of producing a sintered glass ceramic containing hexagonal cordierite as at least 50% by weight of resultant crystalline phase, comprising sintering a shaped article of glass powder having a composition, in mol % on an oxide basis, consisting essentially of ______________________________________
48-61 SiO.sub.2 0-1.5 BaO 0-3 ZnO
10-16 Al.sub.2 O.sub.3
0-3 PbO 0-3 CaO
23-35 MgO 0-3 SrO
0-4 B.sub.2 O.sub.3
0-3 SnO.sub.2
0-2.5
P.sub.2 O.sub.5
0-3 Σ PbO +
SrO + SnO.sub.2
0.5-5 Σ B.sub.2 O.sub.3 + P.sub.2 O.sub.5
0.5-12 F as a
substitute for O.
______________________________________
Claim 8
Independent Claim
90 words
A method of producing a sintered glass ceramic containing hexagonal cordierite as at least 50% by weight of resultant crystalline phase, comprising sintering a shaped article of glass powder having a composition, in mol % on an oxide basis, consisting essentially of ______________________________________
48-61 SiO.sub.2 0-1.5 BaO 0-3 ZnO
10-16 Al.sub.2 O.sub.3
0-3 PbO 0-3 CaO
23-35 MgO 0-3 SrO
0-4 B.sub.2 O.sub.3
0-3 SnO.sub.2
0-2.5
P.sub.2 O.sub.5
0-3 Σ PbO +
SrO + SnO.sub.2
0.5-5 Σ B.sub.2 O.sub.3 + P.sub.2 O.sub.5
0.5-12 F as a
substitute for O.
______________________________________
Claim 9
Dependent Claim
57 words
A method according to claim 6, said glass powder consisting essentially of ______________________________________
51- 57 SiO.sub.2 0-3 PbO
12.5-15.5
Al.sub.2 O.sub.3
0-3 SrO
26-31 MgO 0-3 SnO.sub.2
0.5-2.5 P.sub.2 O.sub.5
0-3 Σ PbO + SrO + SnO.sub.2
0.3-2.0 B.sub.2 O.sub.3
1.0-3.0 Σ P.sub.2 O.sub.5 + B.sub.2 O.sub.3
0.3-2.5 ZnO
0.5-11.0
F as a
substitute for O.
______________________________________
Claim 10
Dependent Claim
20 words
A method according to claim 6, said glass powder having a mean particle size of from 1 to 12 μm.
Claim 11
Dependent Claim
20 words
A method according to claim 7, said glass powder having a mean particle size of from 1 to 12 μm.
Claim 12
Dependent Claim
9 words
A sintered article produced in accordance with claim 6.
Claim 13
Dependent Claim
9 words
A sintered article produced in accordance with claim 7.
Claim 14
Dependent Claim
9 words
A sintered article produced in accordance with claim 8.
Claim 15
Dependent Claim
9 words
A sintered article produced in accordance with claim 9.
References Cited (Backward Citations)
GB957191A
Cited
GB1307303A
Cited
GB1365435A
Cited
US3926648A
Cited
US3940255A
Cited
DE2815312A1
Cited
GB1556650A
Cited
US4540671A
Cited
EP0225279A1
Cited
DE3701973A1
Cited
US4764486A
Cited
US4997795A
Cited
EP0289903A1
Cited
US5099174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |