US5158828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon/metal composite
Assignee: Nippon Steel Corp
•
Filing: 1989-10-17
•
Granted: 1992-10-27
•
Expires: 2009-10-17
Abstract
Abstract An improved carbon/metal composite is disclosed which comprises a carbon matrix and metal fibers distributed in the carbon matrix. The improvement is that the metal fibers are selected from (A) metal fibers in which the surfaces of at least a portion of the fibers are coated or alloyed with another material which has a tendency to form carbides which is equal to or lower than that of the metal constituting the metal fibers, (B) metal fibers comprising at least two different types of metal fibers which differ with respect to their dimensions and/or material, and (C) metal fibers distributed in the carbon matrix in such a manner that their content varies along the thickness of the composite, thereby imparting to the composite improved properties with respect to at least one of mechanical strength, impact resistance, wear resistance, and electric conductivity.
Inventors
- 👤 Kiyoshi Sudani
- 👤 Masato Kano
- 👤 Yukihiro Sugimoto
- 👤 Takashi Fukuda
- 👤 Toru Iwahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/74; C04B35/76; C04B35/515; C04B35/52; C04B35/528; C04B35/532; F; F16; F16D; F16D69/00; F16D69/02; F16D69/023; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12035; Y10T428/12063; Y10T428/12069; Y10T428/12104; Y10T428/12111; Y10T428/249921; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
57 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a metal having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers.
Claim 2
Dependent Claim
57 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a metal having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers.
Claim 3
Dependent Claim
26 words
A carbon/metal composite as claimed in claim 1, wherein the metal fibers are those of rod-shaped, needle-shaped, wedge-shaped, wave-shaped, net-shaped, or a mixture of these shapes.
Claim 4
Dependent Claim
20 words
The carbon/metal composite of claim 1, wherein the composite has a bending strength of at least 1420 kg/cm 2 .
Claim 5
Dependent Claim
20 words
The carbon/metal composite of claim 1, wherein the composite has an impact strength of at least 15 kgcm/cm 2 .
Claim 6
Dependent Claim
51 words
The carbon/metal composite of claim 1, wherein the composite has a wear resistance of less than 13 mm 3 per 100 km of sliding distance wherein a test surface of the composite is rotated at 100 km/hour against a copper plate rotating at 2000 rpm under a load of 1.5 kg.
Claim 7
Dependent Claim
18 words
The carbon/metal composite of claim 1, wherein the composite has an electrical resistance of less than 110 μΩcm.
Claim 8
Dependent Claim
26 words
The carbon/metal composite of claim 1, wherein the fibers have a diameter of no greater than 0.5 mm and a length of at least 1 mm.
Claim 9
Dependent Claim
26 words
The carbon/metal composite of claim 1, wherein the fibers have a diameter of no greater than 0.3 mm and a length of at least 3 mm.
Claim 10
Dependent Claim
17 words
The carbon/metal composite of claim 1, wherein the fibers have an aspect ratio of at least 10.
Claim 11
Dependent Claim
23 words
The carbon/metal composite of claim 1, wherein the fibers are present in an amount of at least 10% by volume of the composite.
Claim 12
Dependent Claim
23 words
The carbon/metal composite of claim 1, wherein the fibers are present in an amount of 10 to 40% by volume of the composite.
Claim 13
Dependent Claim
21 words
The carbon/metal composite of claim 1, wherein the material coated on the fibers has a thickness of at least 0.1 μm.
Claim 14
Dependent Claim
17 words
The carbon/metal composite of claim 1, wherein at least 50% by weight of the fibers are coated.
Claim 15
Dependent Claim
84 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a metal having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers, said metal fibers being steel fibers and said barrier metal being one or more metals selected from the group consisting of copper, nickel, cobalt, aluminum, and silicon.
Claim 16
Dependent Claim
84 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a metal having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers, said metal fibers being steel fibers and said barrier metal being one or more metals selected from the group consisting of copper, nickel, cobalt, aluminum, and silicon.
Claim 17
Dependent Claim
17 words
A carbon/metal composite as claimed in claim 14, wherein a steel fibers are low carbon steel fibers.
Claim 18
Dependent Claim
73 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a material having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers, the surface of at least a portion of the metal fibers being coated with said material.
Claim 19
Dependent Claim
73 words
A carbon/metal composite comprising a carbon matrix and metal fibers distributed in the carbon matrix, the surfaces of at least a portion of the metal fibers being coated or alloyed with a material having a tendency to form carbides equal to or less than the metal fibers and which suppresses formation of carbides in the metal fibers, the surface of at least a portion of the metal fibers being coated with said material.
Claim 20
Dependent Claim
25 words
A carbon/metal composite as claimed in claim 1, wherein the surface of at least a portion of the metal fibers is alloyed with said metal.
Claim 21
Dependent Claim
28 words
A carbon/metal composite as claimed in claim 1, wherein the metal fibers are distributed in the composite so as to be substantially undirectional with respect to each other.
References Cited (Backward Citations)
US4123596A
Cited
JPS57155336A
Cited
JPS58135647A
Cited
US4725677A
Cited
JPS6096742A
Cited
US4581263A
Cited
US4892790A
Cited
JPS61294228A
Cited
EP0212666A2
Cited
US4799957A
Cited
US4761206A
Cited
US4952440A
Cited
JPS6438227A
Cited
JPH01111830A
Cited
JPH01294583A
Cited
JPH01252741A
Cited
JPH0255737A
Cited
US4894286A
Cited
US4928645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |