| 摘要 |
A composite with a polymeric binder contains short fibers of carbon, ceramic, glass, metal or organic polymers with a mean length of 3 to 50 mm and a bundle thickness of 0.1 to 10 mm. The length of at least 75 % of the fibers lies between 90 and 110 % of the mean. The ratio of length to bundle thickness is between 2 and 100 to 1 and the reinforcement comprises at most three fiber layers. Independent claims are also included for the following: (1) The process of saturating filament yarn with a resin or a thermoplastic, placing parallel lengths into a sheet, and then pressing, hardening and cutting to the required length and width; (2) A fiber reinforced composite containing fibers of the claimed specified length and width distribution, including a matrix containing a ceramic; (3) Producing a fiber reinforced ceramic composite based on this process using the additional steps of mixing the cut fibers with carbonisable polymer, e.g. phenolic resin, pressing to shape, heating while excluding oxygen to obtain a porous carbon matrix and then infiltrating with carbide-forming elements, e.g. liquid silicon at 1550 [deg]C, to convert at least some of the carbon to carbide. |
