US 12,391,622 B2
Microstructured fiber interface coatings for composites
Richard Wesley Jackson, Mystic, CT (US); Ying She, East Hartford, CT (US); and Gajawalli V. Srinivasan, South Windsor, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Nov. 8, 2019, as Appl. No. 16/678,833.
Prior Publication US 2021/0139384 A1, May 13, 2021
Int. Cl. C04B 35/80 (2006.01); C04B 35/01 (2006.01); C04B 35/622 (2006.01); C04B 41/50 (2006.01)
CPC C04B 41/5042 (2013.01) [C04B 35/62236 (2013.01); C04B 35/62281 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A coated ceramic fiber comprising:
a zirconium interface coating layer consisting of zirconium metal deposited on the ceramic fiber, a zirconium dioxide interface coating layer directly adjacent to the zirconium interface coating layer, and an additional interface coating layer directly adjacent to the zirconium dioxide interface coating layer, wherein the zirconium dioxide interface coating layer forms micro cracks after a crystal structure transformation;
wherein the additional interface coating layer consists of zirconium and silicon carbide, zirconium boride, or a combination thereof;
wherein the zirconium dioxide interface coating layer has a thickness greater than 200 nm and includes monoclinic zirconium dioxide which forms micro cracks after transforming to tetragonal zirconium dioxide and back to monoclinic zirconium dioxide; or
wherein the zirconium dioxide interface coating layer has a thickness less than 200 nm and includes tetragonal zirconium dioxide which forms micro cracks after transforming to monoclinic zirconium dioxide.