Non-mechanical fabrication of carbon-containing work pieces

Details Non-mechanical fabrication of carbon-containing work pieces Non-mechanical fabrication of carbon-containing work pieces

2001-05-17

2004-05-18

Goudreau, George A. (Department: 1763)

Etching a substrate: processes

Forming or treating fibrous article or fiber reinforced...

C216S051000, C216S056000, C216S067000, C216S077000, C216S079000, C216S081000

Reexamination Certificate

active

06736984

ABSTRACT:

BACKGROUND
The present invention relates to a method of forming complex features and fine details in work pieces made of Carbon-Carbon (C—C) composite material and other carbon-containing materials. The present invention also relates to heat exchangers and fuel cells formed of carbon-containing materials.
Carbon-Carbon composite materials are used in certain heat exchangers and fuel cells. Consider a Carbon-Carbon plate-fin heat exchanger core including a stack of plates and fins. The plates may be made from flat thin-gauge two-dimensional Carbon-Carbon woven fabrics, and the fins may be made from thin-gauge two-dimensional Carbon-Carbon woven fabrics that are corrugated. Thickness of the plates and fins may range between about 0.1 millimeters and 1 millimeter.
Fabricating the Carbon-Carbon fins can be both difficult and time consuming. The fins define long, narrow channels that function as fluid passageways. Because many fins have complex shapes, creating a high density of fins (i.e., x number of fins per linear inch) is even more difficult. Yet it is extremely desirable to increase the fin density in order to increase the heat transfer capability of the heat exchanger.
Carbon-Carbon bipolar plates of proton exchange membrane fuel cells are typically flat, having a thickness of about 0.2-1 millimeters and, in addition, having intricately shaped, fine-featured flow fields for channeling the flow of the hydrogen and oxygen gases used in the operation of the fuel cells. These flow fields typically have defined features of submillimeter dimensions. Forming such fine detailed features is extremely difficult.
SUMMARY
Complex shapes and fine details in a carbon-containing work piece are formed using photolithographic etching methodology. A layer may be formed in a specific pattern on one or both sides of the work piece. Selective etching of the exposed portions of the work piece creates the desired features in the work piece.


REFERENCES:
patent: 3642513 (1972-02-01), Sach et al.
patent: 4493855 (1985-01-01), Sachdev et al.
patent: 4502916 (1985-03-01), Umezaki et al.
patent: 4767418 (1988-08-01), Deininger et al.
patent: 5298298 (1994-03-01), Hoffman
patent: 5330616 (1994-07-01), Yamazaki
patent: 5458733 (1995-10-01), Tessmer et al.
patent: 5544775 (1996-08-01), Kerth et al.
patent: 5611942 (1997-03-01), Mitsui et al.
patent: 5670788 (1997-09-01), Geis
patent: 5679269 (1997-10-01), Cohen et al.
patent: 6096149 (2000-08-01), Hetrick et al.
patent: 6312303 (2001-11-01), Yaniv et al.
patent: 6314228 (2001-11-01), Korenaga et al.
patent: 2001/0019467 (2001-09-01), Otsuka et al.
patent: 2002/0051539 (2002-05-01), Moynihan et al.
patent: 11-214756 (1999-08-01), None
patent: WO 99/33660 (1999-07-01), None
“Ion-Bum—Assisted Etching of Diamond”, Efremow et al.; J. Vac. Sci. Tech. B3(1), Jan./Feb. 1985; pp. 416-418.*
“ECR Plasma Etching of Chemically Vapor Deposited Thin Films”; Pearton et al.; Electronics Letters; (19921); 28 (9); pp. 822-824.*
“Polyimide Photolithography”, IEEE/ISHM 12thInternational Electronic Manufacturing Technology Symposium—Germany Apr. 1, 1992, pp. 295-314.
“Method for Fabricating Imaged Sticker Sheet for use in Printed Circuit Cards Boards”, 2244 Research Disclosure. No. 320, Emsworth, GB, Dec. 1990.
Ishikawa Yamoto, Patent Abstracts of Japan. vol. 1996, No. 12; Publication No.: 08203821; Publication Date: Aug. 9, 1996.

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