C/C-Cu复合材料等离子体烧蚀性能

为了研究渗铜对C/C复合材料烧蚀性能的影响,利用化学气相渗透(CVI)和液态压力浸渗工艺制备了C/C-Cu复合材料,并采用等离子体烧蚀装置对C/C-Cu复合材料进行烧蚀,研究其烧蚀性能。结果表明: Cu的加入有效缩短了材料的制备周期;Cu均匀分布在C/C坯体内,呈连续的网状结构;在烧蚀前30 s阶段,Cu通过熔化吸热降低了C/C-Cu试样的升温速度,C/C-Cu复合材料的线烧蚀率低于C/C复合材料,耐烧蚀性能优异;随着烧蚀时间的延长,C/C-Cu复合材料表层的Cu液被火焰带走,表层变为多孔低密度的C/C层,C/C-Cu复合材料的线烧蚀率迅速增加并超过C/C复合材料,耐烧蚀性能降低。

Plasma ablation properties of C/C-Cu composites

In order to study the ablation properties of C/C composites influenced by copper infiltration, C/C-Cu composites were prepared by chemical vapor infiltration (CVI) and liquid pressure infiltration processes.The ablation properties of C/C-Cu composites were verified using a plasma ablation device.The results show that the preparation period is significantly shortened with the addition of Cu in C/C composites.Cu uniformly distributes in C/C composites and forms a continuous network structure.The linear ablation rate of C/C-Cu composites is lower than that of C/C composites in the initial stage within 30 s of ablation, because the melting of Cu could absorb a lot of energy and reduce the heating rate.With the ablation time increases, Cu on surface of C/C-Cu composites is blowing away by plasma flames, the sample surface of C/C-Cu composites becomes a lower density porous C/C framework.Therefore, the linear ablation rate of C/C-Cu composites increases violently, and becomes higher than C/C composites', the ablation resistance of C/C-Cu composites decreases evidently.