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Patent US4420352A successfully refreshed from Google Patents.
US4420352A
Expired / Lapsed
US
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Absorbable-susceptor joining of ceramic surfaces
Assignee: National Aeronautics and Space Administration
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Filing: 1983-02-10
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Granted: 1983-12-13
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Expires: 2003-02-10
Abstract
Abstract An assembly (28) of ceramic surfaces (21, 23), particularly refractory metal oxides and carbides, abutting a thin sheet (22) of metal susceptor material are placed in a chamber (10) of an enclosure (14) containing inert gas (36). An r.f. coil (24) is activated by power supply (26) to melt the susceptor (22) and adjacent zones (40, 42) of the ceramic. Reactive gas such as oxygen or a carbonizing gas (38) is then fed to the chamber (10) and reacts with the susceptor (22) to form compounds (47) which disperse and dissolve in the zones (40, 42). On cooling, a strong joint is formed. The susceptor may contain inner perforations (58) and outer perforations (56) to aid in distribution of heat.
Inventors
- 👤 James E. Schroeder
- 👤 Paul J. Shlichta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:35
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C04B37/00; C04B37/003; C04B37/006; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6583; C04B2235/66; C04B2235/667; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/50; C04B2237/59; C04B2237/597; C04B2237/70; C04B2237/708; C04B2237/76; C04B2237/765
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
77 words
A method of joining ceramic surfaces comprising the steps of: placing a thin film of metal susceptor material at the interface between the surfaces to form an abutting assembly, said metal being reactive with a gas to form a compound soluble in the ceramic; melting the film and adjacent zones of ceramic; reacting the susceptor with a gas to form said compound; dissolving said compound in the molten ceramic; and cooling the assembly to form a joint.
Claim 2
Independent Claim
77 words
A method of joining ceramic surfaces comprising the steps of: placing a thin film of metal susceptor material at the interface between the surfaces to form an abutting assembly, said metal being reactive with a gas to form a compound soluble in the ceramic; melting the film and adjacent zones of ceramic; reacting the susceptor with a gas to form said compound; dissolving said compound in the molten ceramic; and cooling the assembly to form a joint.
Claim 3
Dependent Claim
20 words
A method according to claim 1 in which the film is heated by applying radio frequency radiation to the assembly.
Claim 4
Dependent Claim
24 words
A method according to claim 2 in which the radiator has a low frequency below 1000 khz and only the susceptor film initially melts.
Claim 5
Dependent Claim
26 words
A method according to claim 2 in which the radiation has a high frequency above 1 mhz and the susceptor film and adjacent zones initially melt.
Claim 6
Dependent Claim
29 words
A method according to claim 2 in which the ceramic is an oxide or carbide of a metal of Groups II, III, IV and VIII of the Periodic Table.
Claim 7
Dependent Claim
31 words
A method according to claim 5 in which the ceramic is an oxide or carbide of beryllum, magnesium, calcium, barium, aluminum, cerium, thorium, zirconium, titanium, tantalum, iron, cobalt, nickel and ruthenium.
Claim 8
Dependent Claim
21 words
A method according to claim 6 in which the reactive gas is selected from an oxidizing, carbonizing, nitriding or sulfiding gas.
Claim 9
Dependent Claim
15 words
A method according to claim 2 in which the compound is identical to the ceramic.
Claim 10
Dependent Claim
19 words
A method according to claim 8 in which the ceramic is a metal oxide and the gas is oxygen.
Claim 11
Dependent Claim
21 words
A method according to claim 8 in which the ceramic is a metal carbide and the gas is a carbonizing gas.
Claim 12
Dependent Claim
21 words
A method according to claim 8 in which the ceramic is a metal nitride and the gas is a nitriding gas.
Claim 13
Dependent Claim
21 words
A method according to claim 8 in which the ceramic is a metal sulfide and the gas is a sulfiding gas.
Claim 14
Dependent Claim
13 words
A method according to claim 1 in which the susceptor film is perforated.
Claim 15
Independent Claim
60 words
An apparatus for joining ceramic surfaces comprising: enclosure means for forming a gas-tight chamber; clamping means disposed within said chambers for holding an assembly of ceramic surfaces with a sheet of metal susceptor therebetween; first inert gas supply means connected to the chamber; second reactive gas supply means connected to the chamber; and induction heating means for heating said assembly.
Claim 16
Independent Claim
60 words
An apparatus for joining ceramic surfaces comprising: enclosure means for forming a gas-tight chamber; clamping means disposed within said chambers for holding an assembly of ceramic surfaces with a sheet of metal susceptor therebetween; first inert gas supply means connected to the chamber; second reactive gas supply means connected to the chamber; and induction heating means for heating said assembly.
References Cited (Backward Citations)
US4347089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |