Method of making carbon-carbon composites

Engle, Glen B

Title: Method of making carbon-carbon composites

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Abstract

A process for making a carbon-carbon composite having a combination of high crystallinity, high strength, high modulus and high thermal and electrical conductivity. High-modulus/high-strength mesophase derived carbon fibers are woven into a suitable cloth. Layers of this easily graphitizable woven cloth are covered with petroleum or coal tar pitch and pressed at a temperature a few degrees above the softening point of the pitch to form a green laminated composite. The green composite is restrained in a suitable fixture and heated slowly to carbonize the pitch binder. The carbonized composite is then impregnated several times with pitch by covering the composite with hot pitch under pressure. The composites are given a heat treatment between each impregnation step to crack up the infiltrated carbon and allow additional pitch to enter the microstructure during the next impregnation cycle. The impregnated composites are then given a final heat treatment in the range 2500.degree. to 3000.degree. C. to fully graphitize the fibers and the matrix carbon. The composites are then infiltrated with pyrolytic carbon by chemical vapor deposition in the range 1000.degree. to 1300.degree. C. at a reduced pressure for approximately one hundred and fifty (150) hours.

Inventors:

Engle, Glen B ^[1]

16716 Martincoit Rd., Poway, CA 92064

Issue Date:: 1991-01-01

Research Org.:: NAMCO J S

OSTI Identifier:: 868048

Patent Number(s):: 5061414

Assignee:: Engle, Glen B. (16716 Martincoit Rd., Poway, CA 92064)

Patent Classifications (CPCs):: C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B35/83 - Carbon fibres in a carbon matrix

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T29/49982 - Coating

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DOE Contract Number:: AC03-86ER80418

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: method; carbon-carbon; composites; process; composite; combination; crystallinity; strength; modulus; thermal; electrical; conductivity; high-modulus; high-strength; mesophase; derived; carbon; fibers; woven; suitable; cloth; layers; easily; graphitizable; covered; petroleum; coal; tar; pitch; pressed; temperature; degrees; softening; form; green; laminated; restrained; fixture; heated; slowly; carbonize; binder; carbonized; impregnated; times; covering; hot; pressure; heat; treatment; impregnation; step; crack; infiltrated; allow; additional; enter; microstructure; cycle; final; range; 2500; degree; 3000; graphitize; matrix; pyrolytic; chemical; vapor; deposition; 1000; 1300; reduced; approximately; hundred; fifty; 150; hours; laminated composite; carbon-carbon composites; matrix carbon; pyrolytic carbon; reduced pressure; carbon fibers; carbon fiber; chemical vapor; vapor deposition; heat treatment; electrical conductivity; carbon composite; carbonized composite; woven cloth; coal tar; mesophase derived; final heat; infiltrated carbon; high-strength mesophase; carbon composites; carbon-carbon composite; /264/29/423/427/

Citation Formats


                    Engle, Glen B. Method of making carbon-carbon composites.  United States: N. p., 1991. 
        Web.

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                    Engle, Glen B. Method of making carbon-carbon composites.  United States.

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                    Engle, Glen B. Tue .  
        "Method of making carbon-carbon composites".  United States.  https://www.osti.gov/servlets/purl/868048.

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@article{osti_868048,

  title        = {Method of making carbon-carbon composites},

  author       = {Engle, Glen B},

  abstractNote = {A process for making a carbon-carbon composite having a combination of high crystallinity, high strength, high modulus and high thermal and electrical conductivity. High-modulus/high-strength mesophase derived carbon fibers are woven into a suitable cloth. Layers of this easily graphitizable woven cloth are covered with petroleum or coal tar pitch and pressed at a temperature a few degrees above the softening point of the pitch to form a green laminated composite. The green composite is restrained in a suitable fixture and heated slowly to carbonize the pitch binder. The carbonized composite is then impregnated several times with pitch by covering the composite with hot pitch under pressure. The composites are given a heat treatment between each impregnation step to crack up the infiltrated carbon and allow additional pitch to enter the microstructure during the next impregnation cycle. The impregnated composites are then given a final heat treatment in the range 2500.degree. to 3000.degree. C. to fully graphitize the fibers and the matrix carbon. The composites are then infiltrated with pyrolytic carbon by chemical vapor deposition in the range 1000.degree. to 1300.degree. C. at a reduced pressure for approximately one hundred and fifty (150) hours.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1991},

  month        = {1}

}

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