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通过化学气相渗透法(CVI)制备出一种新型的“三明治”结构的C/C复合材料。其两侧是纯网胎结构的功能层,主要承担摩擦功能;中间为承担结构作用的结构层,与传统针刺毡结构一致。系统研究了材料的微观组织结构特征及其摩擦磨损性能。结果表明:“三明治”C/C复合材料各个区域的热解炭都为粗糙层结构;刹车性能较传统三维针刺结构C/C复合材料的摩擦性能稳定;在摩擦试验过程中,摩擦面能够形成一层连续均匀的薄膜,使材料在刹车过程中具有较稳定的摩擦系数并能够有效降低材料的磨损率。
A new type of “sandwich” C / C composite was prepared by chemical vapor infiltration (CVI). Its both sides are pure mesh tire structure function layer, which mainly undertakes the friction function; the middle is the structural layer which takes the structural effect, which is consistent with the traditional needle felt structure. The microstructural characteristics of the material and its friction and wear properties were studied systematically. The results show that the pyrolytic carbon in all areas of the “sandwich” C / C composites is rough layer structure; the friction performance of C / C composites with brake performance is more stable than the traditional three-dimensional acupuncture structure; in the friction test, the friction Surface to form a continuous layer of uniform film, the material in the braking process has a more stable coefficient of friction and can effectively reduce the wear rate of the material.