Cross-scale toughened carbon/carbon composite material and preparation method thereof: Fid-Bau Portal

Cross-scale toughened carbon/carbon composite material and preparation method thereof

YIN XUEMIN / HAN LIYUAN / LIU HUIMIN / ZHANG XIN / LI KEZHI / LI HEJUN

The invention relates to a cross-scale toughened carbon/carbon composite material and a preparation method thereof. The cross-scale toughened carbon/carbon composite material comprises a carbon fiber preform, SiC nanowires and carbon nanotubes, wherein the SiC nanowires are in radial in-situ growth on the carbon fiber surface of the carbon fiber preform, and the carbon nanotubes are in random in-situ growth in the growth direction of the surfaces of the SiC nanowires. And the carbon fiber preform on which the radial SiC nanowire-carbon nanotube grows is subjected to isothermal chemical vapor infiltration densification treatment. The method is inspired by a tree root system structure, a carbon fiber-radial SiC nanowire-CNTs multi-scale reinforcement body is obtained, the hierarchical structure is beneficial to load transmission, interface bonding between fibers and a matrix is effectively improved, the excellent toughening effect is achieved, and the mechanical property of the C/C composite material is remarkably improved. According to the technical scheme, the method is simple, the raw material cost is low, repeatability is high, and the method is suitable for preparing composite material components with complex shapes.

本发明涉及一种跨尺度增韧碳/碳复合材料及其制备方法。所述跨尺度增韧碳/碳复合材料包括碳纤维预制体、在碳纤维预制体的碳纤维表面呈放射状原位生长的SiC纳米线、以及在SiC纳米线表面生长方向随机地原位生长的碳纳米管，并且所述生长有放射状SiC纳米线‑碳纳米管的碳纤维预制体经过等温化学气相渗透致密化处理。本方法受到树木根系结构启发，获得了碳纤维‑辐射状SiC纳米线‑CNTs的多尺度增强体，这种分级结构有利于载荷的传递，有效改善纤维与基体之间的界面结合，具有优异的增韧效果，显著提升C/C复合材料的力学性能。本发明的技术方案方法简单，原料成本低，可重复性强，适合于制备形状复杂的复合材料构件。

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