Patent DE-102011084626-A1 (DE)
Title: Preform for producing molded part such as friction washer, comprises two scrim layers that are arranged and impregnated with matrix, where two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving
Inventor: KRUPKA MARIO
IPC: C04B35/83
Filed: 2011-10-17
Abstract: The preform comprises two scrim layers that are arranged on top of each other and impregnated with matrix, where the two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving. The preform is made of fiber-reinforced composite material. One of the two scrim layers is sewed with other of the two scrim layers. The carbon fiber roving and/or the silicon carbide fiber roving of one of the two scrim layers is angularly transferred to the other carbon fiber roving and/or the silicon carbide fiber roving of the scrim layer. The matrix is made of carbon. The preform comprises two scrim layers that are arranged on top of each other and impregnated with matrix, where the two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving. The preform is made of fiber-reinforced composite material. One of the two scrim layers is sewed with other of the two scrim layers. The carbon fiber roving and/or the silicon carbide fiber roving of one of the two scrim layers is angularly transferred to the other carbon fiber roving and/or the silicon carbide fiber roving of the scrim layer. The matrix is made of carbon, silicon carbide, carbon and silicon carbide or carbon, silicon and silicon carbide. The scrim layer has a basis weight of 175-225 g/m 2>. The preform: includes the scrim layers of 10-15 and impregnated with the matrix; and is composed of the carbon fiber roving and/or the silicon carbide fiber roving into the matrix. The scrim layers are arranged on top of each other. Each of the scrim layers is sewed with an adjacent scrim layer. The preform includes 6 biaxial scrims arranged on top of each other and impregnated with the matrix. Each of the biaxial scrims is made of two scrim layers sewed from the respective carbon- and/or silicon carbide- fiber roving. The carbon- and/or silicon carbide- fiber roving of the two sewed scrim layers is angularly arranged to each other. An individual biaxial scrim is not sewed with one another. Each of the biaxial scrims is angularly arranged with respect to the adjacent biaxial and/or the adjacent biaxial scrim. The biaxial scrims are constructed and oriented so that the angle of the carbon- and/or silicon carbide- fiber roving differentiates: from the scrim layers of the biaxial scrim with respect to a reference axis of 80-100[deg] lying in a plane of the respective scrim; and from one another adjacent to each other unsewed scrim layers of different biaxial scrim with respect to the reference axis of 40-50[deg] . The preform includes 4 triaxial scrim layers arranged on top of each other and impregnated with the matrix. Each of the triaxial scrim layers is made of three scrim layers sewed from the respective carbon- and/or silicon carbide- fiber roving. The carbon- and/or silicon carbide- fiber roving of the three scrim layers is angularly arranged to each other. An individual triaxial scrim is not sewed with one another. The preform includes 3 quadraxial scrim layers arranged on top of each other and impregnated with the matrix. Each of the quadraxial scrim layers is made of quadraxial scrim layers sewed from the respective carbon- and/or silicon carbide- fiber roving. The carbon- and/or silicon carbide- fiber roving of the four scrim layer is angularly arranged to each other. An individual quadraxial scrim is not sewed with one another. Independent claims are included for: (1) a method for producing preform; and (2) a method for producing molded part such as friction washer for a clutch or a brake of a motor vehicle.