轻质C_f/Mg复合材料构件预制体制备与试验研究

Fabrication and Experiment Study of Lightweight C_f/ Mg Composite Component Preform

针对轻质碳纤维增强镁基复合材料构件应用研究过程的预制体制备成本高、难度大等问题,开发了能够实现纤维铺放、缠绕、缝合、编织四种预制体制备工艺的成型装置,提出＂依模铺覆—缠绕定型—局部缝合—编织加固＂变截面筒形构件预制体低成本制备工艺。实验结果表明,在环轴向铺层比例为1：1,碳纤维缠绕张力为13.6~56.3N,缝合密度为7~9针/cm2,缝合类型为改进锁式缝合的工艺条件下,所制备的碳纤维预制体效果较好,以此成形的Cf/Mg复合材料构件外形完整、形态良好,预制体未发生明显变形和破坏,碳纤维在基体中分布均匀。

Fiber placement,filament winding,stitching,and weaving are designed and integrated in a fabrication device to solve the high production cost and complex process of performs in the application of lightweight carbon fiber reinforced magnesium matrix composite components. A novel fabricating process named ＂covering on the mould,winding and fixing,stitching the local,and reinforcing by weaving＂is proposed to fulfill the low price and high efficiency in the variable cross-section cylindrical component preforms. The experiment results show that the preforms are successfully fabricated by the developed device and carbon fiber reinforced magnesium matrix composite components are obtained; the shape of preforms is complete and excellent under the parameters as follows： circumferential / axial ply ratio of 1： 1,winding tension of 13. 6 ~ 56. 3N,stitch density of 7 ~ 9 pins / cm2,and improved lock stitch type. The composite components are not obvious deformation and failure,and the carbon fiber distributes homogeneously in the matrix alloy.