US4242294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for encapsulating a molded ceramic member
Assignee: MTU Aero Engines AG
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Filing: 1978-08-03
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Granted: 1980-12-30
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Expires: 1998-08-03
Abstract
Abstract For encapsulating a ceramic molded member for high-temperature isostatic pressing (HIP), a generally porous coating of glass and/or ceramic is applied on the molded member of ceramic and sintered under a vacuum into a pressure-tight capsule encompassing the molded member.
Inventors
- 👤 Werner Huther
- 👤 Klaus Schweitzer
- 👤 Axel Rossmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/1225; B22F3/125; B22F3/1258; B22F3/1266; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6587
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
60 words
In a method for encapsulating a molded member of silicon ceramic material for high-temperature isostatic pressing (HIP); the improvement comprising applying a generally porous coating of a member selected from the group consisting of glass and ceramic material on said molded member; and sintering said coating under a vacuum so as to form a pressure-tight capsule encompassing said molded member.
Claim 2
Dependent Claim
60 words
In a method for encapsulating a molded member of silicon ceramic material for high-temperature isostatic pressing (HIP); the improvement comprising applying a generally porous coating of a member selected from the group consisting of glass and ceramic material on said molded member; and sintering said coating under a vacuum so as to form a pressure-tight capsule encompassing said molded member.
Claim 3
Dependent Claim
64 words
In a method for encapsulating a molded member of reaction-sintered silicon ceramic material, containing excess silicon; the improvement comprising applying a generally porous coating of a member selected from the group consisting of glass and/or a ceramic material on said molded member; evacuating said molded member; filling said molded member with nitrogen (N 2 ); and thereafter sintering said coating into a pressure-tight capsule.
Claim 4
Dependent Claim
64 words
In a method for encapsulating a molded member of reaction-sintered silicon ceramic material, containing excess silicon; the improvement comprising applying a generally porous coating of a member selected from the group consisting of glass and/or a ceramic material on said molded member; evacuating said molded member; filling said molded member with nitrogen (N 2 ); and thereafter sintering said coating into a pressure-tight capsule.
Claim 5
Dependent Claim
46 words
Method as claimed in claim 1 or 2, said glass being constituted of a powder of a member selected from the group consisting of pure SiO 2 glass, SiO 2 -B 2 O 3 glasses and glasses having additions of MgO, Al 2 O 3 .
Claim 6
Dependent Claim
18 words
Method as claimed in claim 1 or 2, said porous coating being constituted of a lithium-containing glass powder.
Claim 7
Dependent Claim
35 words
Method as claimed in claim 1 or 2 comprising applying a mixture of glass powder and an organic binding agent on said molded member; and drying said coating to thereby produce said coated molded member.
Claim 8
Dependent Claim
20 words
Method as claimed in claim 1 or 2 comprising applying said porous coating on said molded member by thermal spraying.
Claim 9
Dependent Claim
16 words
Method as claimed in claim 5, said organic binding agent comprising a saturated alcoholic stearin solution.
Claim 10
Dependent Claim
15 words
Method as claimed in claim 5, said organic binding agent comprising an aqueous gelatin paste.
Claim 11
Dependent Claim
27 words
Method as claimed in claim 1 or claim 2, wherein the temperature for sintering said porous coating is in the range of about 700° to 1400° C.
Claim 12
Dependent Claim
24 words
Method as claimed in claim 1 or claim 2, wherein the time for sintering dense said porous coating is approximately 1/2 to 2 hours.
Claim 13
Dependent Claim
29 words
Method as claimed in claim 1 or claim 2, comprising performing said sintering dense in a hot isostatic press, said hot isostatic pressing (HIP) immediately following said sintering step.
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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |