Patent US4384909A successfully refreshed from Google Patents.
US4384909A
Expired / Lapsed
US
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Bonding Si3 N4 ceramics
Assignee: RTX Corp
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Filing: 1981-11-16
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Granted: 1983-05-24
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Expires: 2001-11-16
Abstract
Abstract Compositions are disclosed for securing Si 3 N 4 parts together, these compositions being in the β'-Y 2 Si 2 O 7 --Y 3 Al 5 O 12 tetrahedron, e.g. compositions in mole % comprising (1) 15% Si 3 N 4 , 79.1% Y 2 Si 2 O 7 and 6.9% Y 3 Al 5 O 12 or (2) 25% Si 2 AlON 3 and 75% Y 3 Al 5 O 12 Y. A method of securing Si 3 N 4 parts together comprises placing the composition between the parts to be bonded and heating to brazing temperature (about 1600° C.) in nitrogen.
Inventors
- 👤 George K. Layden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B37/00; C04B37/003; C04B37/005; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/368
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
37 words
A composition particularly adapted to joining Si 3 N 4 parts comprising, in mole percent, 15% Si 3 N 4 , 79.1% Y 2 Si 2 O 7 and 6.9% Y 3 Al 5 O 12 .
Claim 2
Dependent Claim
37 words
A composition particularly adapted to joining Si 3 N 4 parts comprising, in mole percent, 15% Si 3 N 4 , 79.1% Y 2 Si 2 O 7 and 6.9% Y 3 Al 5 O 12 .
Claim 3
Dependent Claim
29 words
A composition particularly adapted to joining Si 3 N 4 parts comprising, in mole percent, 25% Si 2 AlON 3 and 75% Y 3 Al 5 O 12 .
Claim 4
Dependent Claim
29 words
A composition particularly adapted to joining Si 3 N 4 parts comprising, in mole percent, 25% Si 2 AlON 3 and 75% Y 3 Al 5 O 12 .
Claim 5
Independent Claim
49 words
A method of bonding Si 3 N 4 parts together comprising placing between the parts to be bonded a composition comprising 15% Si 3 N 4 , 79.1% Y 2 Si 2 O 7 and 6.9% Y 3 Al 5 O 12 and heating to brazing temperature in nitrogen.
Claim 6
Independent Claim
49 words
A method of bonding Si 3 N 4 parts together comprising placing between the parts to be bonded a composition comprising 15% Si 3 N 4 , 79.1% Y 2 Si 2 O 7 and 6.9% Y 3 Al 5 O 12 and heating to brazing temperature in nitrogen.
Claim 7
Independent Claim
41 words
A method of bonding Si 3 N 4 parts together comprising placing between the parts to be bonded a composition comprising 25% Si 2 AlON 3 and 75% Y 3 Al 5 O 12 and heating to brazing temperature in nitrogen.
Claim 8
Independent Claim
41 words
A method of bonding Si 3 N 4 parts together comprising placing between the parts to be bonded a composition comprising 25% Si 2 AlON 3 and 75% Y 3 Al 5 O 12 and heating to brazing temperature in nitrogen.
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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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |