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- 2017
连续碳纤维/Mg复合材料异形薄板件预制体制备与成型
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Abstract:
针对连续碳纤维增强镁基（Cf/Mg）复合材料异形薄板件预制体制备成本高、性能不稳定等问题，提出了"仿形编织-环向缠绕-铺放定位-缝合增强"的低成本组合制备工艺，设计开发了与之相配套的预制体制备装置。通过理论与实验研究，确定薄板与凸台预制体分体制备：薄板预制体采用径向编织、环向缠绕，仿形无纬布织物与环向纤维层针刺合成，其中纬纱引纬张力控制在1.7~2.3 N；凸台预制体采用无纬布横向叠层，再与环状薄板预制体缠绕缝合而成。所制备预制体外形完整，形态良好，环向碳纤维分布均匀、与径向增强碳纤维呈规则排列。经液固挤压制备的Cf/Mg复合材料异形薄板件表明，凸台与薄板连接强度良好，为成形高质量Cf/Mg复合材料异形薄板件奠定了基础。 Besides the high cost, the preforms of Cf/Mg composites sheet-shaped components prepared by the traditional fabrication techniques own the unstable performance. To overcome these disadvantages, a new fabrication technique entitled "Profiling weave-Hoop winding-Oriented placement-Stitched reinforcement" was proposed and consequently the related experimental devices were developed. Based on the experimental investigations, the separate preparations of the circular sheet preform and protruding table preform were fabricated and then protruding table preform was stitched to the sheet preform. The circular sheet preform was fabricated through the radial weave and circumferential winding of the fibers and the combination of the non-woven fabrics and hoop fiber layers, wherein the weft insertion weft tension control in 1.7-2.3 N. The protruding table preform was fabricated through the stack of the horizontal non-woven fabrics. The fabricated sheet-shaped preform preforms have the intact morphology with the uniformly distributed circular and radial fibers. Meanwhile, the Cf/Mg composites sheet-shaped components fabricated by the liquid-solid extrusion process show that the connection between the protruding table and circular sheet preform is of good quality. 国家863计划（2015AA8011004B）；国家自然科学基金（51472203；51521061；51575447）
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