Patent ID: 10202715

Abstract:
Disclosed are an annular fibrous preform and a method of preparing the 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 with an annular fibrous web (1) in advance. The method of preparing a preform involves needle-punching an annular fibrous fabric (2) formed of abutted sector-shaped fibrous fabrics with an annular fibrous web (1) in advance and fixedly joining the same into an annular composite fabric (4), and then needle-punching and forming annular units (5) to realize the preparation of the annular fibrous preform. The present method effectively eliminates the occurrence of deformation and misplacement of sector-shaped abutted fibrous fabric during needle-punching at a later stage such that the in-plane and interlayer uniformity and consistency are good, and has advantages such as high fiber content, excellent mechanical performance, and a high utilization rate of raw material, 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 baking systems of high-speed trains and high-end automobiles.