US5045298A
Expired / Lapsed
US
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Carbon material and process for production thereof
Assignee: Kobe Steel Ltd
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Filing: 1989-08-31
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Granted: 1991-09-03
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Expires: 2009-08-31
Abstract
Abstract A carbon material is provided which comprises spherical crystal amorphous carbon having a void diameter in the crystallite of 30 Å or below, and there is also provided a process of the production of a carbon material, in which a thermosetting resin that will be converted to amorphous carbon after using for the carbonization is molded, the molded thermosetting resin is preliminarily heated at a temperature of 1,000° to 1,900° C., and an isostatic pressure of 1,000 atmospheres or over is applied to the preliminarily heated body at a temperature of 2,050° C. or over.
Inventors
- 👤 Kazuo Muramatsu
- 👤 Kazuo Inoue
- 👤 Yoshihiko Sakashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; C01; C01B; C01B32/00; C01B32/05; C04B35/524
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
A carbon material comprising amorphous carbon containing spherical crystals having a void diameter, in the crystallite structure, of 30 Å or below and apparent specific gravity of 1.80 or over.
Claim 2
Dependent Claim
30 words
A carbon material comprising amorphous carbon containing spherical crystals having a void diameter, in the crystallite structure, of 30 Å or below and apparent specific gravity of 1.80 or over.
Claim 3
Dependent Claim
46 words
A carbon material as defined in claim 1, wherein a compressive stress layer is formed to the surface of said carbon material by injecting at least one of elements selected from the group consisting of N, Ar, Cr, Fe, Ni, B Cu, Mo, Ta and Ti.
Claim 4
Dependent Claim
60 words
A carbon material as defined in claim 1, wherein a layer of an intercalation compound comprising at least one of elements selected from the group consisting of Mn, Fe, Ni, Co, Zn, Mo, MgCl 2 , FeCl 2 , FeCl 3 , NiCl 2 , AlCl 3 and F, and graphite is formed to the surface of said carbon material.
Claim 5
Dependent Claim
74 words
A process of producing a carbon material which comprises the steps of: (a) molding a thermosetting resin which will be converted to an amorphous carbon by firing for carbonization, (b) preliminarily heating said molded thermosetting resin at a temperature of 1000° to 1900° C. to prepare a heated body, and (c) applying an isostatic pressure of not less than 1000 atm to said heated body at a temperature of not less than 2050° C.
Claim 6
Dependent Claim
74 words
A process of producing a carbon material which comprises the steps of: (a) molding a thermosetting resin which will be converted to an amorphous carbon by firing for carbonization, (b) preliminarily heating said molded thermosetting resin at a temperature of 1000° to 1900° C. to prepare a heated body, and (c) applying an isostatic pressure of not less than 1000 atm to said heated body at a temperature of not less than 2050° C.
Claim 7
Dependent Claim
36 words
A process as defined in claim 4, wherein the molded thermosetting resin is preliminarily heated at a temperature of 1,500° to 1,900° C., so that the remaining hydrogen amount is reduced to 100 ppm or below.
Claim 8
Dependent Claim
59 words
A process as defined in claim 4, further comprising the step of injecting at least one element selected from the group consisting of N, Ar, Cr, Fe, Ni, Cu, Mo, Ta, B and Ti to the surface of the carbon material obtained by applying isostatic pressure, thereby forming a compressive stress layer to the surface of said carbon material.
Claim 9
Dependent Claim
72 words
A process as defined in claim 4, further comprising the step of bringing the carbon material obtained by applying isostatic pressing into contact with at least one element selected from the group consisting of Mn, Fe, Ni, Co, Zn, Mo, MgCl 2 , FeCl 2 , FeCl 3 , NiCl 2 , AlCl 3 and F, thereby forming a layer of intercalation compound with graphite to the surface of said carbon material.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |