US 11,655,871 B2
Composites and methods of forming composites via pitch infiltration
Weiming Lu, Akron, OH (US); and Gary Pruett, Boradview Heights, OH (US)
Assigned to Goodrich Corporation, Charlotte, NC (US)
Filed on Mar. 13, 2020, as Appl. No. 16/818,930.
Prior Publication US 2021/0285511 A1, Sep. 16, 2021
Int. Cl. F16D 69/02 (2006.01); F16D 65/12 (2006.01); C23C 16/26 (2006.01)
CPC F16D 69/023 (2013.01) [F16D 65/126 (2013.01); C23C 16/26 (2013.01); F16D 2200/0052 (2013.01); F16D 2200/0065 (2013.01); F16D 2200/0091 (2013.01)] 14 Claims
OG exemplary drawing
1. A method of pitch infiltration, the method comprising:
infiltrating a carbon fiber preform with carbon using chemical vapor infiltration or deposition (CVI/CVD) processing to increase a density of the carbon fiber preform to form a densified preform having an open porosity between 8% and 15%;
disposing a pitch on a densified preform surface of the densified preform, wherein the pitch is a mesophase pitch;
heating the pitch and making the pitch into an anisotropic network structure;
guiding the pitch through the densified preform in a predetermined direction;
managing a crystal size of the pitch;
aligning the pitch in a predetermined orientation;
stabilizing the pitch in the densified preform to form a composite with a pitch-based carbon; and
carbonizing the composite and further managing the crystal size of the pitch-based carbon in the composite to form a carbon/carbon brake disk having a second open porosity of less than 5%.