Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – With carbonizing – then adding carbonizable material and...
Reexamination Certificate
2011-05-10
2011-05-10
Johnson, Christina (Department: 1742)
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
With carbonizing, then adding carbonizable material and...
C264S103000, C264S171100
Reexamination Certificate
active
07938992
ABSTRACT:
Method for manufacturing pitch-densified carbon-carbon composite brake discs from carbon fiber preforms, by the following sequential steps: (a) providing a carbon-carbon composite brake disc preform; (b) heat treating the preform; (c) subjecting the heat-treated preform to Chemical Vapor Deposition/Chemical Vapor Infiltration processing; (d) infiltrating the preform with an isotropic low to medium char-yield pitch by Vacuum Pitch Infiltration processing or Resin Transfer Molding processing; (e) carbonizing the pitch-infiltrated preform; (f) machining the surfaces of the resulting carbonized preform; and (g) repeating steps (d) through (f) until the density of the carbon-carbon composite preform is at least 1.70 g/cc. The use of VPI equipment with isotropic, low to medium char-yield pitches for all densification steps following an initial CVD densification reduces capital and pitch materials cost. However, one or more RTM processing steps employing low to medium char-yield pitches may also be used to obtain improved economics.
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La Forest Mark L.
Murdie Neil
Simpson Allen H.
Honeywell International , Inc.
Johnson Christina
Shumaker & Sieffert P.A.
Thrower Larry
LandOfFree
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