Inventors:
- Wright-Patterson AFB OH, US
Michael K. Cinibulk - Beavercreek OH, US
Randal S. Hay - Beavercreek OH, US
Pavel Mogilevsky - Beavercreek OH, US
Triplicane A. Parthasarathy - Beavercreek OH, US
Kristin A. Keller - Springboro OH, US
International Classification:
C04B 35/628
C04B 35/626
C04B 35/80
Abstract:
A method of manufacturing a coated reinforcing fiber for use in Ceramic Matrix Composites, the method comprising pre-oxidizing a plurality of silicon-based fibers selected from the group consisting of silicon carbide (SiC) fibers, silicon nitride (SiN) fibers, SiCO fibers, SiCN fibers, SiCNO fibers, and SiBCN fibers at between 700 to 1300 degrees Celsius in an oxidizing atmosphere to form a silica surface layer on the plurality of silicon-based fibers, forming a plurality of pre-oxidized fibers; applying a rare earth orthophosphate (REPO) coating to the plurality of pre-oxidized fibers; and heating the plurality of REPOcoated pre-oxidized fibers at about 1000-1500 degrees Celsius in an inert atmosphere to react the REPOwith the silica surface layer to form a rare earth silicate or disilicate. The pre-oxidizing step may be 0.5 hours to about 100 hours. The heating step may be about 5 minutes to about 100 hours.