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 Title: |
US5916633:
Fabrication of carbon/carbon composites by forced flow-thermal gradient chemical vapor infiltration
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lackey, Walter Jackson; Marietta, GA
Vaidyaraman, Sundar; Atlanta, GA
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| Assignee: |
Georgia Tech Research Corporation, Atlanta, GA
other patents from GEORGIA TECH RESEARCH CORP. (221085) (approx. 433)
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| Published / Filed: |
1999-06-29
/ 1995-05-19
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| Application Number: |
US1995000445425
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| IPC Code: |
Advanced:
C04B 35/83;
C23C 16/04;
C23C 16/26;
Core:
more...
IPC-7:
C23C 16/26;
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| ECLA Code: |
C04B35/83; C23C16/04D; C23C16/26;
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| U.S. Class: |
Current:
427/249.3;
427/008;
427/228;
427/249.4;
427/255.24;
Original:
427/249;
427/008;
427/255.1;
427/228;
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| Field of Search: |
427/008,249,255.1,228
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| Priority Number: |
| 1995-05-19 |
US1995000445425 |
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| Abstract: |
The fabrication of carbon/carbon composite disks using forced flow-thermal gradient chemical vapor infiltration process using propylene diluted with hydrogen as the reagent is disclosed. The independent variables included concentration of the reagent, total flow rate and preform bottom temperature. The response variables included infiltration time, final porosity, rate of weight gain and deposition rate. The infiltration time and rate of weight gain are affected only by the three independent variables. The densification of the composites is monitored by the back pressure. The composites were cut into slices 1 cm long, 4 mm wide and 2 mm deep to measure the uniformity of densification, which varied very little within a composite. Coating thickness as a function of position increased exponentially from the cold side to the hot side of the composite. The coating thicknesses near the cold side and the hot side are used to calculate the rate constant for the pyrolysis of propylene in the preform. The activation energy is approximately 18.6 Kcal/mol and the rate constant is given by 1n k=8.2--9375.1/T (K)
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| Attorney, Agent or Firm: |
Deveau, Colton & Marquis ;
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| Primary / Asst. Examiners: |
Beck, Shrive; Meeks, Timothy
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 25 claims |
What is claimed is:
1. A method for fabricating carbon fiber-carbon matrix composites comprising the steps of:
- a. preparing a preform consisting essentially of multiple layers of carbon cloth;
- b. placing the preform in a furnace reactor chamber comprising a feed end and a discharge end, wherein said preform approximately conforms in dimension and shape to the inside walls of said furnace reactor chamber;
- c. establishing a thermal gradient across the preform;
- d. introducing a process feed gas comprising a carbon source into the furnace reactor chamber through the feed end; and
- f. establishing a pressure gradient across said preform by maintaining the pressure at the feed end approximately 3.4 kPa or more above the pressure at the discharge end, thereby forcing the process feed gas to flow through the preform resulting in the deposition of carbon from the carbon source within the preform, the pressure at the feed end increasing as the carbon is deposited within the preform.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 6 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
CHEMABS 131(04)048257Q
CHEMABS 131(04)048257Q
DERABS C1999-384705
DERABS C1999-384705
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| Other References: |
Kimura, et al., High Temp. High Press. 13, 193 (1980) (month unknown).
Beaty, R.L. and D.V. Kiplinger, Nucl. Appl. Tech., 8, 488 (1970) (month unknown).
Sugiyama, K., and T. Nakamura, J. Mat. Sci. Lett., 6, 331, (1987) (month unknown).
(3 pages)
Cited by 2 patents
Buckley, J.D., and Dan D. Edie, Noyes Publications, Park Ridge, N.J., pp. 111-118, and 211-215 (1993) (month unknown).
Lackey, W.J., T.L. Starr, Fiber Reinforced Ceramic Composites, ed. by K.S. Mazdiyansi, 397-449 (Noyes Publications, N.J. 1991) (month unknown).
Vaidyaraman, S., W.J. Lackey, G.B. Freeman, P.K. Agrawa, and M.D. Langman, J. Mat. Res., vol. 10, No. 6, Jun., 1995.
McAllister, P., J.F. Hendricks and E.E. Wolf, Carbon, 28, 579 (1990) (month unknown).
(10 pages)
Oh, S.H., and J.Y. Lee, Carbon, 26, 763-769 (1988) (month unknown).
(6 pages)
Cited by 3 patents
Box, G.E.P. and D.R. Cox, J. Royal Stat. Soc. B., 26. 211 (1964) (month unknown).
Caputo, A.J., R.A. Lowden and D.P. Stinton, Improvements in the Fabrication of Ceramic-Fiber-Ceramic-Matrix Composites by Chemical Vapor Infiltration, ORNL/TM-9651, Oak Ridge Nat. Lab., Oak Ridge, TN (Jun. 1985).
Tesner, P.A., Chemistry and Physics of Carbon, ed. P.A. Thrower, 19, 65 (1983) (month unknown), pp. 66-161.
Oh, S.M., and J.Y. Lee, Carbon, 27, 423-430 (1989) (month unknown).
(8 pages)
Marinkovic, S. and S. Dimitrijevic, Carbon, 23, 691-95 (1985) (month unknown).
(9 pages)
Savage, G. Carbon-Carbon Composites, Chapman & Hall, N.Y., 1993 (no month).
Thomas, C.R. ed., Essentials of Carbon-Carbon Composites, Royal Society of Chemistry, London, 1993. (no month).
Oh et al. Carbon, vol. 27, No. 3, pp. 423-430 (1989). (month unknown).
(8 pages)
Vaidyaraman et al. "Rapid Processing of Carbon-Carbon Composites by Forced-Flow Thermal Gradient Chemical Vapor Infiltration", Materials Research Society Symposium Proceedings, v. 365, 1995, pp. 325-330 (month unknown).
Kotlensky, "A Review of CVD Carbon Infiltration of Porous Substrates", Proc. 16th Nat. Symposium of the Soc. of Aerospace Mat. & Proc. Eng., Apr., 1971, pp. 257-265.
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