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US3871834A
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Carbon-fiber-reinforced aluminum composite material
Assignee: Hitachi Ltd
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Filing: 1971-12-23
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Granted: 1975-03-18
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Expires: 1991-12-23
Abstract
Abstract A carbon-fiber-reinforced aluminum composite material comprises an aluminum matrix containing an alloying element reactive with carbon to form a carbide and carbon fibers having a tensile strength larger than that of the aluminum matrix. The amount of the carbon fibers is larger than the critical volume ratio that is the lower limit required for reinforcing the aluminum matrix. The carbide of the alloying element is formed on the interface between the carbon fibers and the matrix thereby to form a close adherence between the aluminum matrix and the carbon fibers.
Inventors
- 👤 Keiichi Kuniya
- 👤 Hideo Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/14; B; B22; B22D; B22D19/00; B22D19/02; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/938; Y10S277/939; Y10S277/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12486; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
101 words
A CARBON FIBER-REINFORCED ALUMINUM COMPOSITE MATERIAL COMPRISING AN ALUMINUM CONTAINING MATRIX WITH AT LEAST ONE ALLOYING ELEMENT WHICH IS REACTIVE WITH CARBON AND CARBON FIBERS EMBEDDED IN SAID MATRIX THAT HAVE A TENSILE STRENGTH LARGER THAN THAT OF SAID MATRIX, THE AMOUNT OF SAID CARBON FIBERS BEING LARGER THAN THE CRITIAL VOLUME RATIO REQUIRED TO REINFORCE SAID MATRIX AND THE SURFACES OF SAID CARBON FIBERS BEING SUBSTANTIALLY COVERED WITH A THIN CARBIDE FILM FORMED BY REACTION OF SAID ELEMENT WITH CARBON, SAID CARBIDE FILM BEING IN DIRECT CONTACT WITH SAID MATRIX SO THAT SAID CARBON FIBERS INTIMATELY ADHERE TO SAID MATRIX.
Claim 2
Dependent Claim
101 words
A CARBON FIBER-REINFORCED ALUMINUM COMPOSITE MATERIAL COMPRISING AN ALUMINUM CONTAINING MATRIX WITH AT LEAST ONE ALLOYING ELEMENT WHICH IS REACTIVE WITH CARBON AND CARBON FIBERS EMBEDDED IN SAID MATRIX THAT HAVE A TENSILE STRENGTH LARGER THAN THAT OF SAID MATRIX, THE AMOUNT OF SAID CARBON FIBERS BEING LARGER THAN THE CRITIAL VOLUME RATIO REQUIRED TO REINFORCE SAID MATRIX AND THE SURFACES OF SAID CARBON FIBERS BEING SUBSTANTIALLY COVERED WITH A THIN CARBIDE FILM FORMED BY REACTION OF SAID ELEMENT WITH CARBON, SAID CARBIDE FILM BEING IN DIRECT CONTACT WITH SAID MATRIX SO THAT SAID CARBON FIBERS INTIMATELY ADHERE TO SAID MATRIX.
Claim 3
Dependent Claim
29 words
The carbon fiber-reinforced aluminum composite material according to claim 1, wherein said alloying element has a negative value of standard free energy change upon reacting with the carbon fibers.
Claim 4
Dependent Claim
33 words
The carbon fiber-reinforced aluminum composite material according to claim 1, wherein said containing matrix with containing said alloying element has a melting point lower than the temperature at which aluminum reacts with carbon.
Claim 5
Dependent Claim
50 words
The carbon fiber-reinforced aluminum composite material according to claim 2, wherein said element has a negative value of standard free energy change upon reacting with the carbon fibers and also has an absolute value greater than that of standard free energy change in the reaction of aluminum and carbon fibers.
Claim 6
Dependent Claim
34 words
The carbon fiber reinforced aluminum composite material according to claim 2, wherein said element includes Cr, Ce, V, U, Th, Nb, Si, Mo, Fe( 3), Ta, Ti, Zr, W, Hf, Co( 4) and Mn.
Claim 7
Dependent Claim
130 words
A carbon fiber-reinforced aluminum composite material comprising an aluminum containing matrix with at least one alloying element reactive with said carbon and carbon fibers embedded in said matrix having a tensile strength larger than that of said matrix, said carbon fibers being oriented in one direction, the amount of said carbon fibers being larger than the critical volume ratio required for reinforcement of said matrix but smaller than such an amount that no gaps between fibers which are not filled with aluminum are left, and the surfaces of said carbon fibers are substantially covered with a thin carbide matrix film formed by reaction of said element with carbon, said carbide film being in direct contact with said matrix to produce an intimate adherence between said matrix and said carbon fibers.
Claim 8
Dependent Claim
130 words
A carbon fiber-reinforced aluminum composite material comprising an aluminum containing matrix with at least one alloying element reactive with said carbon and carbon fibers embedded in said matrix having a tensile strength larger than that of said matrix, said carbon fibers being oriented in one direction, the amount of said carbon fibers being larger than the critical volume ratio required for reinforcement of said matrix but smaller than such an amount that no gaps between fibers which are not filled with aluminum are left, and the surfaces of said carbon fibers are substantially covered with a thin carbide matrix film formed by reaction of said element with carbon, said carbide film being in direct contact with said matrix to produce an intimate adherence between said matrix and said carbon fibers.
Claim 9
Dependent Claim
54 words
The carbon fiber-reinforced aluminum composite material according to claim 6, wherein an amount of said element is larger than about 3 X 10 6 mole per one cubic centimeter of said carbon fiber but smaller than such an amount that the melting point of said matrix containing said element is lower than about 1,100*C.
Claim 10
Dependent Claim
37 words
The carbon fiber-reinforced aluminum composite material according to claim 7, wherein the amount of alloying element is smaller than an amount such that the melting point of the matrix containing said element is lower than about 1,000*C.
Claim 11
Dependent Claim
25 words
The carbon fiber-reinforced aluminum composite material according to claim 8 wherein the carbon fibers have a tensile strength of from about 50 to 300 Kg/mm2.
Claim 12
Dependent Claim
103 words
A carbon fiber-reinforced aluminum composite material comprising a matrix of an aluminum alloy containing at least one alloying element which is reactive with carbon and carbon fibers embedded in said matrix that have a tensile strength larger than that of said matrix, the amount of said carbon fibers being larger than the critical volume ratio required to reinforce said matrix and the surfaces of said carbon fibers being substantially covered with a thin carbide film formed by reaction of said element with carbon, said carbide film being in direct contact with said matrix so that said carbon fibers intimately adhere to said matrix.
Claim 13
Dependent Claim
103 words
A carbon fiber-reinforced aluminum composite material comprising a matrix of an aluminum alloy containing at least one alloying element which is reactive with carbon and carbon fibers embedded in said matrix that have a tensile strength larger than that of said matrix, the amount of said carbon fibers being larger than the critical volume ratio required to reinforce said matrix and the surfaces of said carbon fibers being substantially covered with a thin carbide film formed by reaction of said element with carbon, said carbide film being in direct contact with said matrix so that said carbon fibers intimately adhere to said matrix.
Claim 14
Dependent Claim
29 words
The carbon fiber-reinforced aluminum composite material according to claim 10, wherein said alloying element has a negative value of standard free energy change upon reacting with the carbon fibers.
Claim 15
Dependent Claim
32 words
The carbon fiber-reinforced aluminum composite material according to claim 10, wherein said containing matrix with said alloying element has a melting point lower than the temperature at which aluminum reacts with carbon.
Claim 16
Dependent Claim
50 words
The carbon fiber-reinforced aluminum composite material according to claim 11, wherein said element has a negative value of standard free energy change upon reacting with the carbon fibers and alSo has an absolute value greater than that of standard free energy change in the reaction of aluminum and carbon fibers.
Claim 17
Dependent Claim
55 words
The carbon fiber-reinforced aluminum composite material according to claim 10, wherein an amount of said element is larger than about 3 X 10 6 mole per one cubic centimeter of said carbon fiber but smaller than such an amount that the melting point of said matrix containing said element is lower than about 1,100* C.
Claim 18
Dependent Claim
39 words
The carbon fiber-reinforced aluminum composite material according to claim 14, wherein the amount of alloying element is smaller than an amount of such that the melting point of the matrix containing said element is lower than about 1,000* C.
Claim 19
Dependent Claim
45 words
The carbon fiber-reinforced aluminum composite material according to claim 1, wherein said aluminum containing matrix includes an aluminum matrix and an aluminum alloy matrix with said at least one alloying element being uniformly disposed in said alloy matrix, said alloy matrix contacting said carbon fibers.
Claim 20
Dependent Claim
29 words
The carbon fiber-reinforced aluminum composite material according to claim 16, wherein said alloying element has a negative value of standard free energy change upon reacting with the carbon fibers.
Claim 21
Dependent Claim
32 words
The carbon fiber-reinforced aluminum composite material according to claim 16, wherein said containing matrix with said alloying element has a melting point lower than the temperature at which aluminum reacts with carbon.
Claim 22
Dependent Claim
50 words
The carbon fiber-reinforced aluminum composite material according to claim 18, wherein said element has a negative value of standard free energy change upon reacting with the carbon fibers and also has an absolute value greater than that of standard free energy change in the reaction of aluminum and carbon fibers.
Claim 23
Dependent Claim
55 words
The carbon fiber-reinforced aluminum composite material according to claim 16, wherein an amount of said element is larger than about 3 X 10 6 mole per one cubic centimeter of said carbon fiber but smaller than such an amount that the melting point of said matrix containing said element is lower than about 1,100* C.
Claim 24
Dependent Claim
39 words
The carbon fiber-reinforced aluminum composite material according to claim 20, wherein the amount of alloying element is smaller than an amount of such that the melting point of the matrix containing said element is lower than about 1,000* C.
Claim 25
Dependent Claim
42 words
The carbon fiber-reinforced aluminum composite material according to claim 15, wherein aluminum alloy matrix is one of up to 2% Zr - Al, up to 12% Nb - Al, up to 1% Mo - Al or up to 16% Fe - Al.
Claim 26
Dependent Claim
60 words
The carbon fiber reinforced aluminum composite material according to claim 21, wherein aluminum alloy matrix is one of up to 2% Zr - Al, up to 5% Ti - Al, up to 18% Cr - Al, up to 5% V -Al, up to 12% Nb - Al, up to 1% Mo - Al or up to 16% Fe - Al.
References Cited (Backward Citations)
US3473900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |