| 摘要 |
PCT No. PCT/FR98/02895 Sec. 371 Date Aug. 27, 1999 Sec. 102(e) Date Aug. 27, 1999 PCT Filed Dec. 28, 1998 PCT Pub. No. WO99/33767 PCT Pub. Date Jul. 8, 1999A fiber structure is made by superposing plies of fiber fabric and bonding the plies together by needling, so that the fibers of the superposed plies extend essentially in a first direction (X) and in a second direction (Y) orthogonal thereto, the plies being bonded together by fibers that are moved by the needling in a third direction (Z) extending transversely relative to the plies, and a piston preform is cut out from the needled fiber structure so that one of the first and second directions (X, Y) is parallel to the generator lines of the surface of the preform that corresponds to the cylindrical side surface of the piston. The preform is densified at least in part by the substance that constitutes the matrix of the composite material, and the piston is machined from the densified preform. |
