US4731298A
Expired / Lapsed
US
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Carbon fiber-reinforced light metal composites
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1985-09-12
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Granted: 1988-03-15
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Expires: 2005-09-12
Abstract
Abstract Carbon fiber-reinforced light metal composites comprising a light metal and carbon fiber having a three layer-coating, i.e. a layer of carbon, a protective layer against deteriorative reaction, and a wettability-improving layer superposed outwardly in the order mentioned, are provided. The carbon fiber-reinforced light metal composites are manufactured by binding carbon fibers having the aforementioned three layer-coating with a light metal.
Inventors
- 👤 Akio Shindo
- 👤 Kuniaki Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:37
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12625
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
A carbon fiber-reinforced light metal composite, comprising at least one light metal selected from the group consisting of aluminum alloy, magnesium and magnesium alloy, and carbon fibers having a layer formed of at least 95% by weight of free carbon, a layer formed preponderantly of at least one compound selected from the group consisting of metal carbides, titanium nitride, and boron nitride, and a layer formed preponderantly of at least one compound selected from the group consisting of titanium-boron, boron, and silicon-boron superposed on said carbon fibers outwardly in the order mentioned.
Claim 2
Dependent Claim
92 words
A carbon fiber-reinforced light metal composite, comprising at least one light metal selected from the group consisting of aluminum alloy, magnesium and magnesium alloy, and carbon fibers having a layer formed of at least 95% by weight of free carbon, a layer formed preponderantly of at least one compound selected from the group consisting of metal carbides, titanium nitride, and boron nitride, and a layer formed preponderantly of at least one compound selected from the group consisting of titanium-boron, boron, and silicon-boron superposed on said carbon fibers outwardly in the order mentioned.
Claim 3
Dependent Claim
36 words
A carbon fiber-reinforced light metal composite according to claim 1, wherein said metal carbide is a carbide of at least one metal selected from the group consisting of silicon, boron, titanium, zirconium, tungsten, niobium, and tantalum.
Claim 4
Dependent Claim
27 words
A carbon fiber-reinforced light metal composite according to claim 1, wherein each of said three layers possesses a thickness in the range of 2 to 0.001 μm.
Claim 5
Dependent Claim
27 words
A carbon fiber-reinforced light metal composite according to claim 1, wherein the combined thickness of said three layer is in the range of 3 to 0.003 M.
Claim 6
Dependent Claim
29 words
A carbon fiber-reinforced light metal composite according to claim 1, wherein said carbon fibers are carbon fibers produced by being heat-treated at a temperature of at least 1,000° C.
Claim 7
Dependent Claim
145 words
A carbon fiber-reinforced light metal composite, comprising (1) coated carbon fibers embedded in (2) a light metal matrix, wherein: the said coated carbon fibers each comprise a carbon fiber core coated with three successive layers, wherein the first of the said layers comprises at least 95% by weight free carbon, the second of the said layers is made of at least one member selected form the group consisting of metal carbides, titanium nitride and boron nitride, and the third of the said layers is made of at least one member selected from the group consisting of titanium-boron, boron and silicon-boron compounds; wherein the said layers extend outwardly from the said carbon fiber in the order: first layer, second layer, third layer, and wherein the said light metal is at least one member selected from the group consisting of aluminum, aluminum alloys, magnesium and magnesium alloys.
Claim 8
Dependent Claim
145 words
A carbon fiber-reinforced light metal composite, comprising (1) coated carbon fibers embedded in (2) a light metal matrix, wherein: the said coated carbon fibers each comprise a carbon fiber core coated with three successive layers, wherein the first of the said layers comprises at least 95% by weight free carbon, the second of the said layers is made of at least one member selected form the group consisting of metal carbides, titanium nitride and boron nitride, and the third of the said layers is made of at least one member selected from the group consisting of titanium-boron, boron and silicon-boron compounds; wherein the said layers extend outwardly from the said carbon fiber in the order: first layer, second layer, third layer, and wherein the said light metal is at least one member selected from the group consisting of aluminum, aluminum alloys, magnesium and magnesium alloys.
Claim 9
Dependent Claim
40 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said metal carbide is at least one member selected from the group consisting of silicon carbide, boron carbide, titanium carbide, zirconium carbide, tungsten carbide, niobium carbide and tantalum carbide.
Claim 10
Dependent Claim
24 words
The carbon fiber-reinforced light metal composite of claim 6, wherein each of the said three layers has a thickness of 2 to 0.001 μm.
Claim 11
Dependent Claim
23 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said three layers have a combined thickness of 3 to 0.003 μm.
Claim 12
Dependent Claim
28 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said carbon fibers are carbon fibers produced by heat-treatment at a temperature of at least 1,000° C.
Claim 13
Dependent Claim
16 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said light metal is aluminum.
Claim 14
Dependent Claim
18 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said light metal is an aluminum alloy.
Claim 15
Dependent Claim
16 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said light metal is magnesium.
Claim 16
Dependent Claim
18 words
The carbon fiber-reinforced light metal composite of claim 6, wherein the said light metal is a magnesium alloy.
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |