时尚汽车_汽车生活移动版

Referring to FIG. 8, the preform core 602 may include a plurality of plies 800a to 800n (also generically referred to herein as “plies 800′ or as a “ply 800”) of reinforcement material arranged in a stacked configuration. The reinforcement material may be provided as any suitable arrangement of woven or unwoven fibers, whiskers, or the like, formed of one or more materials such as carbon, silicon oxide, silicon carbide, aluminum oxide, aluminum nitride, mullite, titanium boride, zirconium oxide, or the like or a combination thereof.

As exemplarily shown in FIG. 8, the bottommost ply in the stack 800 (i.e., ply 800a) forms the radially-facing inner surface 610 of the preform core 602, and the topmost ply in the stack 800 (i.e., ply 800n) forms the radially-facing outer surface 614 of the preform core 602. In one embodiment, the plies 800 lay substantially flat so that second axially-facing surfaces of the plies 800 cooperatively form the second axially-facing surface 612 of the preform core 602. As exemplarily shown, the second axially-facing surface 612 of the preform core 602 includes a transition surface 802 and an inclined surface 804. Transitions can take the form of a noodle in some embodiments.

In one embodiment, the location and shape of the transition surface 802 of the preform core 602 generally corresponds to the location and shape of the transition surface 122 of the blade track 100. In another embodiment, the location and shape of the inclined surface 804 of the preform core 602 generally corresponds to the location and shape of the mating surface 124 of the blade track 100. In one embodiment, the preform core 602 shown in FIG. 8 may be formed by arranging the plies $00 in a stack and impregnating the stack with a material such as a wax, a polymer, or the like. The resulting structure can then optionally be machined as desired.

Referring to FIG. 9, the preform core 602 may include a plurality of plies 900a to 900n (also generically referred to herein as “plies 900” or as a “ply 900”) of reinforcement material arranged in a stacked configuration, and a preform insert 902. The reinforcement material may be provided as exemplarily described with respect to the reinforcement material of the plies 800. In one embodiment, the preform insert 902 is formed of any suitable reinforcement material as exemplarily discussed above. In another embodiment, the preform insert 902 may be formed of any suitable ceramic matrix material as exemplarily discussed above. In another embodiment, the preform insert 902 may be provided as a GMC structure.

As exemplarily shown, the bottommost ply in the stack 900 (i.e., ply 900a) forms a portion of the radially-facing inner surface 610 of the preform core 602, and the radially-facing outer surface 614 of the preform core 602 is formed by a plurality of plies including the topmost ply in the stack 900 (i.e., ply 900n). In one embodiment, the plies 900 are bent to have a generally horizontal portion and an inclined portion so that when the plies 900 are stacked, the inclined surface 804 of the preform core 602 is formed substantially by only the bottommost ply 900 in the stack (i.e., by ply 900a). It will be appreciated, however, that the ply 900a and one or more other plies 900 may be structured to form the inclined surface 804. As exemplarily shown, the preform insert 902 forms a portion of the radially-facing inner surface 610 of the preform core 602, and also forms the transition surface 802 of the preform core 602. It should be appreciated, however, that the preform insert 902 may also be structured to form at least a portion of the inclined surface 804. In one embodiment, the preform core 602 shown in FIG. 9 may be formed by arranging the plies 900 in a stack, providing the preform insert 902 to abut against ply 900a (i.e., at an axially rearward side of the stack), and impregnating the resulting structure with a material such as a wax, a polymer, or the like, sufficient to at least temporarily couple the preform insert 902 to the stack of plies 900. The resulting structure can then be optionally machined as desired.