US4896816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a fluidtight and heat curable seal between metal objects and a body of vitroceramic material
Assignee: Societe Francaise dEquipements pour la Navigation Aerienne SFENA SA
•
Filing: 1987-11-06
•
Granted: 1990-01-30
•
Expires: 2007-11-06
Abstract
Abstract A process for producing a fluidtight seal between a body of a vitroceramic material and a metal element intended to be part of the construction of a gas laser and in particular a laser gyrometer includes interposing between the surfaces of the body of vitroceramic material and the metal element to be sealed a joining member of a metal capable of diffusing into the vitroceramic material, and subjecting the assembly thus formed to a thermo-compression operation so as to result in a superficial diffusion of the material of the joining member into the facing surfaces of the body of vitroceramic material and the metal element.
Inventors
- 👤 Guy Lascar
- 👤 Jean-Jacques Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:11
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A method for producing a fluidtight seal between a body of vitroceramic material formed of an amorphous phase and a quartzic crystalline phase β and a metal element intended to form part of the construction of a gas laser, and in particular a laser gyrometer, said method comprising the steps of: interposing between surfaces to be sealed of said body of said vitroceramic material formed of an amorphous phase and a quartzic crystalline phase β and said metal element an annular joining member of aluminum capable of diffusing into said vitroceramic material; and subjecting the assembly thus formed to a thermo-compression operation comprising a preliminary step of heating the assembly to a temperature required to provide diffusion at the interface between said vitroceramic material and said aluminum annular joining member, said preliminary heating step being followed by a step of compression of the assembly in order to provide a plastic deformation of the joining member, so as to cause a superficial diffusion of the aluminum material of said annular joining member into the facing surfaces of said body of vitroceramic material and said metal element.
Claim 2
Independent Claim
185 words
A method for producing a fluidtight seal between a body of vitroceramic material formed of an amorphous phase and a quartzic crystalline phase β and a metal element intended to form part of the construction of a gas laser, and in particular a laser gyrometer, said method comprising the steps of: interposing between surfaces to be sealed of said body of said vitroceramic material formed of an amorphous phase and a quartzic crystalline phase β and said metal element an annular joining member of aluminum capable of diffusing into said vitroceramic material; and subjecting the assembly thus formed to a thermo-compression operation comprising a preliminary step of heating the assembly to a temperature required to provide diffusion at the interface between said vitroceramic material and said aluminum annular joining member, said preliminary heating step being followed by a step of compression of the assembly in order to provide a plastic deformation of the joining member, so as to cause a superficial diffusion of the aluminum material of said annular joining member into the facing surfaces of said body of vitroceramic material and said metal element.
Claim 3
Dependent Claim
34 words
A method according to claim 1, wherein said joining member is made from a single closed annular element having a polygonal cross-sectional shape and including an integral centering membrane having therein a central orifice.
Claim 4
Dependent Claim
115 words
A method according to claim 1, comprising placing in position the elements to be sealed under adequate mechanical centering conditions, heating said elements to a temperature of 400° C. to 490° C., in such a manner that said temperature is reached at least in the region of said joining member and of the connection surfaces of said elements, applying during a few seconds a joint-deforming force so as to ensure a rapid, hot, and plastic deformation of the aluminum material of said joining member, maintaining said joint-deforming force at said temperature and, after withdrawal of said joint-deforming force, allowing the assembly to cool slowly so as to return to the ambient temperature in several hours.
Claim 5
Dependent Claim
27 words
A method according to claim 1, comprising subjecting said joining member, subsequent to production thereof, to a recrystallization heat treatment process and a scouring process before use.
Claim 6
Dependent Claim
37 words
A method according to claim 1, wherein the sealed assembly of elements is subjected to a heat treatment for ensuring a relaxation of the stresses produced in the connection plane by differential expansion of the sealed elements.
Claim 7
Dependent Claim
20 words
A method according to claim 1, wherein said compression step is conducted at a pressure of 20 to 60 MPa.
References Cited (Backward Citations)
US3513535A
Cited
US3458923A
Cited
US4050956A
Cited
US3752554A
Cited
FR2183213A1
Cited
GB1482696A
Cited
US3956821A
Cited
DE2556279A1
Cited
US4273282A
Cited
US4407658A
Cited
US4595377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |