US 11,852,416 B2
Carbon fiber, carbon composite and furnace purification by hydrogen reduction followed by thermal heat treatment
Weiming Lu, Akron, OH (US)
Assigned to GOODRICH CORPORATION, Charlotte, NC (US)
Filed by GOODRICH CORPORATION, Charlotte, NC (US)
Filed on Aug. 25, 2021, as Appl. No. 17/411,929.
Application 17/411,929 is a division of application No. 15/936,025, filed on Mar. 26, 2018, granted, now 11,131,503.
Prior Publication US 2021/0381769 A1, Dec. 9, 2021
Int. Cl. F27D 7/06 (2006.01); F27D 19/00 (2006.01); C04B 35/64 (2006.01); F16D 65/12 (2006.01); C04B 35/83 (2006.01); F27D 21/00 (2006.01)
CPC F27D 7/06 (2013.01) [C04B 35/64 (2013.01); C04B 35/83 (2013.01); F16D 65/126 (2013.01); F27D 19/00 (2013.01); C04B 2235/614 (2013.01); C04B 2235/652 (2013.01); C04B 2235/656 (2013.01); C04B 2235/658 (2013.01); C04B 2235/6567 (2013.01); C04B 2235/6581 (2013.01); C04B 2235/6582 (2013.01); C04B 2235/661 (2013.01); C04B 2235/664 (2013.01); C04B 2235/72 (2013.01); C04B 2235/725 (2013.01); C04B 2235/728 (2013.01); C04B 2235/77 (2013.01); F16D 2200/0052 (2013.01); F16D 2250/0023 (2013.01); F27D 21/0014 (2013.01); F27D 2007/063 (2013.01); F27D 2019/0003 (2013.01); F27D 2019/0031 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of removing contamination from at least one of a furnace and an intermediate product of a carbon/carbon part within the furnace comprising:
introducing a gaseous reducing agent into the furnace at a first temperature;
bringing the furnace to a second temperature to cause the gaseous reducing agent to reduce a contaminate, the second temperature being greater than the first temperature;
substantially removing the gaseous reducing agent from the furnace by at least one of creating a first pressure differential and creating a first purging gas flow;
bringing the furnace to a third temperature that is greater than the second temperature and decreasing a pressure within the furnace, after removing the gaseous reducing agent, to vaporize the contaminate; and
removing the vaporized contaminate from the furnace by at least one of creating a second pressure differential or flowing a second purging gas through the furnace.