Patent US4216017A successfully refreshed from Google Patents.
US4216017A
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Method and equipment for sintering under pressure
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1978-09-20
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Granted: 1980-08-05
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Expires: 1998-09-20
Abstract
Abstract The materials to be sintered are placed in a deformable container which is in turn placed within a non-deformable treatment module equipped with heating means. The temperature of the container is increased under constant pressure until commencement of sintering. The temperature and pressure of the materials are increased simultaneously until sintering conditions are achieved, then maintained at a level stage for a predetermined period of time. The pressure is then reduced to the normal value while maintaining the temperature. The temperature is finally reduced to the room-temperature value.
Inventors
- 👤 Jacques P. Carcey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:33
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B30; B30B; B30B15/00; B30B15/04; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2675; C04B35/622; C04B35/64; C04B35/645; Y; Y10; Y10S; Y10S425/00; Y10S425/035
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
A method for sintering under pressure ceramic materials, refractory materials or homogeneous metallic materials, of either uniform or composite structure, wherein said method comprises the following steps: placing the materials to be sintered in a deformable composite container having substantially opposite top and bottom walls and a lateral wall made up of several elements, placing said container within a nondeformable treatment module provided with heating means, pressing said top and bottom walls towards each other until a predetermined temperature is established, increasing the temperature of said container and the materials therein while pressing said top and bottom walls of said container toward each other at constant pressure while said container is free to expand laterally if necessary by deformation of said container until commencement of sintering of said materials, simultaneously increasing the temperature of and the pressure applied to press said top and bottom walls until sintering conditions for densification are fully established in said materials, maintaining a constant temperature in said container and a constant force pressing said top and bottom walls towards each other for a predetermined period of time, reducing the pressure on said container while maintaining the temperature, and then reducing the temperature to room temperature.
Claim 2
Independent Claim
200 words
A method for sintering under pressure ceramic materials, refractory materials or homogeneous metallic materials, of either uniform or composite structure, wherein said method comprises the following steps: placing the materials to be sintered in a deformable composite container having substantially opposite top and bottom walls and a lateral wall made up of several elements, placing said container within a nondeformable treatment module provided with heating means, pressing said top and bottom walls towards each other until a predetermined temperature is established, increasing the temperature of said container and the materials therein while pressing said top and bottom walls of said container toward each other at constant pressure while said container is free to expand laterally if necessary by deformation of said container until commencement of sintering of said materials, simultaneously increasing the temperature of and the pressure applied to press said top and bottom walls until sintering conditions for densification are fully established in said materials, maintaining a constant temperature in said container and a constant force pressing said top and bottom walls towards each other for a predetermined period of time, reducing the pressure on said container while maintaining the temperature, and then reducing the temperature to room temperature.
Claim 3
Dependent Claim
36 words
A method for sintering uniform materials according to claim 1, wherein the materials placed in the container are provided in the form of powder and wherein said placing operation is carried out with application of vibrations.
Claim 4
Dependent Claim
24 words
A method for sintering uniform materials according to claim 1, wherein the materials placed within the container are provided in the form of slip.
Claim 5
Dependent Claim
25 words
A method for sintering uniform materials according to claim 1, wherein the materials placed within the container are provided in the form of granular powder.
Claim 6
Dependent Claim
24 words
A method for sintering composite materials according to claim 1, wherein the placing of the materials is carried out by superposition of the constituents.
Claim 7
Dependent Claim
51 words
A method for sintering according to claim 1, wherein the step of simultaneously increasing temperature and pressure is performed in a high pressure press into which said treatment module is inserted at the beginning of that step and which was not used for applying pressure in the previous constant pressure step.
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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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |