US3949804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a metal-impregnated body
Assignee: Toyota Motor Corp
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Filing: 1974-03-21
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Granted: 1976-04-13
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Expires: 1994-03-21
Abstract
Abstract The present invention relates to a method of manufacturing a metal-impregnated body in which a porous body is immersed under sub-atmospheric pressure in a molten alloy for impregnation with said alloy or a porous body is immersed under elevated pressures produced by various gases, the pressure then being reduced to normal level, after which the porous body is introduced together with a molten alloy into a metal mold, in which said molten alloy is impregnated into said porous body. The porous body is then separated from said molten alloy.
Inventors
- 👤 Yasuhisa Kaneko
- 👤 Yoshiro Komiyama
- 👤 Katsumi Kondo
- 👤 Fumiyoshi Noda
- 👤 Hideki Murakami
- 👤 Kunihiko Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49984
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
Method of manufacturing a metal-impregnated body which comprises the steps of: introducing a porous body into a vacuum furnace at a subatmospheric pressure to reduce the pressure in pores of the body to sub-atmospheric pressure; submerging said body in a molten pool of alloy in the furnace to fill the surface pores of the body with molten alloy while its internal pores are under sub-atmospheric pressure; raising the pressure in the furnace to at least atmospheric pressure to partially impregnate the body with the alloy; removing the molten alloy and body from the furnace; placing the molten alloy and body in a pressurizing mold with the body submerged in the alloy; applying high pressure to the molten alloy and said body in the mold to further impregnate the body with the alloy; cooling the molten alloy and the so impregnated body in said mold while maintaining the high pressure, to solidify the molten alloy around the impregnated body; re-heating the solidified alloy and said impregnated body to re-melt the alloy; and removing the impregnated body from the re-melted alloy.
Claim 2
Dependent Claim
179 words
Method of manufacturing a metal-impregnated body which comprises the steps of: introducing a porous body into a vacuum furnace at a subatmospheric pressure to reduce the pressure in pores of the body to sub-atmospheric pressure; submerging said body in a molten pool of alloy in the furnace to fill the surface pores of the body with molten alloy while its internal pores are under sub-atmospheric pressure; raising the pressure in the furnace to at least atmospheric pressure to partially impregnate the body with the alloy; removing the molten alloy and body from the furnace; placing the molten alloy and body in a pressurizing mold with the body submerged in the alloy; applying high pressure to the molten alloy and said body in the mold to further impregnate the body with the alloy; cooling the molten alloy and the so impregnated body in said mold while maintaining the high pressure, to solidify the molten alloy around the impregnated body; re-heating the solidified alloy and said impregnated body to re-melt the alloy; and removing the impregnated body from the re-melted alloy.
Claim 3
Dependent Claim
51 words
A method according to claim 1 wherein said step of introducing a porous body into a vacuum furnace comprises introducing a plurality of porous bodies into the furnace; and treating each of said plurality of bodies in the manner specified for said porous body, to obtain a plurality of impregnated bodies.
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein said step of raising the pressure in the furnace comprises introducing a gas to the furnace to raise the pressure to a pressure above atmospheric, but below several atmospheres.
Claim 5
Dependent Claim
43 words
A method according to claim 1 wherein said step of raising the pressure in the furnace comprises introducing a gas to the furnace to raise the pressure in the furnace to a pressure above atmospheric pressure but not greater than about 5 atmospheres.
Claim 6
Dependent Claim
33 words
A method according to claim 1 wherein said step of applying high pressure to the mold comprises applying a pressure in the range of about 1,000 Kg/cm 2 to 2,000 Kg/cm 2 .
Claim 7
Dependent Claim
30 words
A method according to claim 1 wherein said porous body is a body selected from the group consisting of carbon, pressed silicon nitride powder, sintered silicon nitride, and sintered alumina.
Claim 8
Dependent Claim
26 words
A method according to claim 6 wherein said molten alloy is an alloy selected from the group consisting of an aluminum alloy, and a silver alloy.
References Cited (Backward Citations)
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |