粒子浓度对C/C复合材料烧蚀行为的影响

Effect of Particle Concentration on Ablation Behavior of Carbon/Carbon Composites

为研究不同粒子浓度侵蚀条件下C/C复合材料的烧蚀机理及性能,采用自主研发的氧-煤油烧蚀实验系统对轴棒法编织的C/C复合材料进行烧蚀/侵蚀实验,实验的粒子浓度分别为0,1.37%,2.22%,2.64%。采用扫描电镜(SEM)观察实验后试样的微观形貌,测算了试样的烧蚀率,研究了粒子浓度对材料烧蚀率的影响规律,分析了材料的烧蚀机理。结果表明:不加粒子时试样的质量烧蚀率仅为0.159g/s,线烧蚀率为0.175mm/s,加入粒子后质量烧蚀率与线烧蚀率的最小值分别为0.432g/s和0.843mm/s,且随粒子浓度的增加,烧蚀率均加速增加。粒子的侵蚀作用加剧了试样的烧蚀,冲刷面上径向纤维的烧蚀梯度随粒子浓度的增加而增大。

A self-designed oxygen-kerosene ablation system was employed to study the ablation mechanism and performance of the carbon-carbon composites.Particle concentrations of the gas-solid twophase ablation flow were 0,1.37%,2.22%,and 2.64%respectively.The microstructure of post-test samples was analysed through the scanning electron microscope（SEM）,and the ablation rate was calculated.The influence principle of particle concentrations on the ablation rate of the carbon-carbon composites was studied,and the mechanism of ablation was analysed.Experiment results show that with no particles involved the mass ablation rate is 0.159g/s and the linear ablation rate is 0.175mm/s,while with particles introduced,the minimum mass ablation rate and linear ablation rate are 0.432g/s and 0.843mm/s respectively,with the increase of particle concentrations,the ablation rate becomes accelerated.Particle erosion makes the ablation of sample seriously intensified,and the ablation gradient of radial fiber on erosion surface is increased with the increase of particle concentrations as well.