| 摘要 |
A CMC airfoil ( 20 ) formed with CMC stitches ( 37 ) interconnected between opposed walls ( 26, 28 ) of the airfoil to restrain outward flexing of the walls resulting from pressurized cooling air within the airfoil. The airfoil may be formed of a ceramic fabric infused with a ceramic matrix and dried, and may be partially to fully cured. Then holes ( 32, 34 ) are formed in the opposed walls of the airfoil, and a ceramic stitching element such as ceramic fibers ( 36 ) or a ceramic tube ( 44 ) is threaded through the holes. The stitching element is infused with a wet ceramic matrix before or after threading, and is flared ( 38 ) or otherwise anchored to the walls ( 26, 28 ) to form a stitch ( 37 ) there between. The airfoil and stitch are then cured. If the airfoil is cured before stitching, a pre-tension is formed in the stitch due to relative curing shrinkage.
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