时尚汽车_汽车生活移动版

As mentioned above, the segment portion 102 and the attachment portions described herein can be provided as an integrally-formed ceramic matrix composite (CMC) structure. In one embodiment, such a CMC structure may be formed by providing a preform structure and providing a ceramic matrix material (i.e., aluminum oxide, zirconium oxide, silicon oxide, silicon carbide, or the like or a combination thereof) which, for example, infiltrates the preform structure. Generally, the preform structure includes a reinforcement material (e.g. woven or unwoven fibers, whiskers, or the like, formed of carbon, silicon oxide, silicon carbide, aluminum oxide, aluminum nitride, mullite, titanium boride, zirconium oxide, or the like or a combination thereof). The ceramic matrix material may be provided by any suitable process such as chemical vapor deposition, chemical vapor infiltration, dipping, spraying, electroplating, or the like or a combination thereof.

Referring to FIG. 6, a preform structure 600 includes a preform core 602 and a plurality of reinforcement wraps such as first reinforcement wrap 604, second reinforcement wrap 606 and third reinforcement wrap 608. Because FIG. 6 only partially illustrates the preform structure 600 (i.e., illustrating one axial end of the preform structure 600), it should be appreciated that the preform structure 600 may extend along the axial direction any desired length. It should also be appreciated that the structure of the opposite axial end of the preform structure 600 may be the same as or different from the axial end of the preform structure 600 illustrated in FIG. 6.

In one embodiment, as will be discussed in greater detail below, the preform core 602 may include reinforcement material (i.e., 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). In another embodiment, the preform core 602 may be provided as a monolithic piece formed from a material such as silicon carbide. Each reinforcement wrap may be formed of one or more plies of reinforcement material. In one embodiment, each reinforcement wrap is formed of four plies of reinforcement material. In another embodiment, the number of plies of reinforcement material in one or more of the first, second and third reinforcement wraps 604, 606 and 608 may be the same as or different from the number of plies of reinforcement material in any other of theirst, second and third reinforcement wraps 604, 606 and 608. In one embodiment, the reinforcement material included in one or more of the first, second and third reinforcement wraps 604, 606 and 608 may be the same as or different from the reinforcement material in any other of the first, second and third reinforcement wraps 604, 606 and 608. In another embodiment, the orientation of one or more plies of reinforcement material in one or more of the first, second and third reinforcement wraps 604, 606 and 608 may be the same as or different from the orientation of one or more plies of reinforcement material in any other of the first, second and third reinforcement wraps 604, 606 and 608.

The first reinforcement wrap 604 is disposed on a radially-facing inner surface 610 of the preform core 602, the second reinforcement wrap 606 is disposed on a second axially-facing surface 612 and a radially-facing outer surface 614 of the preform core 602, and the third reinforcement wrap 608 is disposed on the first and second reinforcement wraps 604 and 606. In one embodiment, the first and second reinforcement wraps 604 and 606 extend axially beyond the second axially-facing surface 612 of the preform core 602 to form a rim portion 616. The third reinforcement wrap 608 may be disposed on the lower, side and upper surface of the rim 616 to thereby surround the rim 616. In the illustrated embodiment, the third reinforcement wrap 608 is provided such that an edge 618 of the third reinforcement wrap 608 is substantially coplanar with preform termination surface 620 of the second reinforcement wrap 606. In other embodiments, the third reinforcement wrap 608 can be provided such that the edge 618 is recessed below the preform termination surface 620, or may alternatively be provided such that the edge 618 is positioned beyond the preform termination surface 620.