Patent US4056874A successfully refreshed from Google Patents.
US4056874A
Expired / Lapsed
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Process for the production of carbon fiber reinforced magnesium composite articles
Assignee: Celanese Corp
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Filing: 1976-05-13
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Granted: 1977-11-08
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Expires: 1996-05-13
Abstract
Abstract An improved process is provided for the formation of carbon fiber reinforced magnesium composite articles wherein substantially pure magnesium or magnesium alloys serve as the continuous matrix phase. A minor quantity of dispersed solid magnesium nitride sufficient to enhance the wettability of the carbon fiber reinforcement is provided in the molten magnesium containing metal when it is contacted with the carbon fiber reinforcement. The usual difficulties encountered when the production of such a composite article is attempted resulting from the inherent poor wettability of the carbon fibers by molten magnesium containing metal effectively are eliminated. The resulting composite article exhibits improved properties resulting from a more complete infiltration of the carbon fibers by the molten magnesium containing metal prior to solidification, and better adhesion between the fiber and metal.
Inventors
- 👤 Ilmar L. Kalnin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:36
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
In a process for the formation of a carbon fiber reinforced composite article wherein carbon fibers are incorporated in a magnesium containing metallic matrix comprising (a) providing said carbon fibers in contact with a molten magnesium containing metal while at a temperature above the melting point of said metal, and (b) cooling the resulting magnesium containing metal having said carbon fibers incorporated therein to a temperature below the melting point of said metal; the improvement comprising providing in said molten magnesium containing metal when contacted with said carbon fibers prior to said cooling a minor quantity of dispersed solid magnesium nitride sufficient to enhance the wettability of said carbon fibers by said magnesium containing metal.
Claim 2
Dependent Claim
115 words
In a process for the formation of a carbon fiber reinforced composite article wherein carbon fibers are incorporated in a magnesium containing metallic matrix comprising (a) providing said carbon fibers in contact with a molten magnesium containing metal while at a temperature above the melting point of said metal, and (b) cooling the resulting magnesium containing metal having said carbon fibers incorporated therein to a temperature below the melting point of said metal; the improvement comprising providing in said molten magnesium containing metal when contacted with said carbon fibers prior to said cooling a minor quantity of dispersed solid magnesium nitride sufficient to enhance the wettability of said carbon fibers by said magnesium containing metal.
Claim 3
Dependent Claim
21 words
An improved process according to claim 1 wherein said magnesium containing metal comprises about 25 to 100 percent by weight magnesium.
Claim 4
Dependent Claim
16 words
An improved process according to claim 1 wherein said magnesium containing metal is substantially all magnesium.
Claim 5
Dependent Claim
46 words
An improved process according to claim 1 wherein said solid magnesium nitride is dispersed in said molten magnesium containing metal when contacted with said carbon fibers in a concentration of about 0.2 to 25 percent by weight based upon the weight of said magnesium containing metal.
Claim 6
Dependent Claim
115 words
In a process for the formation of a carbon fiber reinforced composite article wherein carbon fibers are incorporated in a magnesium containing metallic matrix comprising (a) providing said carbon fibers in contact with a molten magnesium containing metal while at a temperature above the melting point of said metal, and (b) cooling the resulting magnesium containing metal having said carbon fibers incorporated therein to a temperature below the melting point of said metal; the improvement comprising exposing said molten magnesium containing metal prior to said cooling to gaseous nitrogen whereby solid dispersed magnesium nitride is formed therein in a minor quantity sufficient to enhance the wettability of said carbon fibers by said magnesium containing metal.
Claim 7
Dependent Claim
115 words
In a process for the formation of a carbon fiber reinforced composite article wherein carbon fibers are incorporated in a magnesium containing metallic matrix comprising (a) providing said carbon fibers in contact with a molten magnesium containing metal while at a temperature above the melting point of said metal, and (b) cooling the resulting magnesium containing metal having said carbon fibers incorporated therein to a temperature below the melting point of said metal; the improvement comprising exposing said molten magnesium containing metal prior to said cooling to gaseous nitrogen whereby solid dispersed magnesium nitride is formed therein in a minor quantity sufficient to enhance the wettability of said carbon fibers by said magnesium containing metal.
Claim 8
Dependent Claim
21 words
An improved process according to claim 5 wherein said magnesium containing metal comprises about 25 to 100 percent by weight magnesium.
Claim 9
Dependent Claim
16 words
An improved process according to claim 5 wherein said magnesium containing metal is substantially all magnesium.
Claim 10
Dependent Claim
26 words
An improved process according to claim 5 wherein said molten magnesium containing metal at a temperature below about 1200° C. is exposed to said gaseous nitrogen.
Claim 11
Dependent Claim
25 words
An improved process according to claim 8 wherein said molten magnesium containing metal is exposed to gaseous nitrogen for about 3 to about 200 minutes.
Claim 12
Dependent Claim
29 words
An improved process according to claim 6 wherein said molten magnesium containing metal while at a temperature of about 800° to 1000° C. is exposed to said gaseous nitrogen.
Claim 13
Dependent Claim
35 words
An improved process according to claim 7 wherein said molten magnesium containing metal while at a temperature of about 800° to 850° C. is exposed to said gaseous nitrogen for about 5 to 120 minutes.
Claim 14
Dependent Claim
25 words
An improved composite article wherein carbon fiber reinforcement is incorporated in a magnesium containing metal matrix formed in accordance with the process of claim 1.
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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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |