| 摘要 |
Disclosed are an annular fibre preform and a method of preparing same. The preform is formed by superposing and needle-punching annular units (5) containing an annular composite fabric (4), and the annular composite fabric (4) is shaped by needle-punching sector-shaped fibrous fabric (3) of the same type as an annular fibre mesh tyre (1) in advance. The method of preparing a preform involves an annular fibrous fabric (2) of spliced sector-shaped fibrous fabric being needle-punched in advance with an annular fibre mesh tyre (1) and fixedly joined into an annular composite fabric (4), and then needle-punching and forming annular units (5) to realise the preparation of the annular fibre preform. The present method effectively eliminates the occurrence of deformation and misplacement of sector-shaped spliced fibrous fabric during needle-punching at a later stage such that the uniformity and consistency between layers and within surfaces are good, and has advantages such as high fibre content, excellent mechanical performance, and a high raw material utilization rate, so that the friction performance of friction material is improved after a C/C composite is formed, and the combination property is excellent. The method can be applied to the production of composite material preforms for aircraft brake discs, and can also be applied to the production of friction material preforms in braking systems of high-speed trains and high-end automobiles. |
