C/C-Cu复合材料微观结构及高温耐烧蚀性能研究  

Microstructure and high temperature ablative property of C/C-Cu composites

作　　者：禹正华 杨鑫[1] 陈飞雄[2] 颜君毅[2] 黄启忠[1] 江睿 韩非江 Yu Zheng-hua;Yang Xin;Chen Fei-xiong;Yan Jun-yi;Huang Qi-zhong;Jiang Rui;Han Fei-jiang(State Key Laboratory of Powder Metallurgy,Central South University,Hunan Changsha 410083,China;Advanced Technology&Materials Co.,Ltd.,Beijing 100081,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]安泰科技股份有限公司,北京100081

出　　处：《炭素技术》2022年第1期32-36,58,共6页Carbon Techniques

摘　　要：为提高C/C复合材料的高温耐烧蚀性能,采用化学气相沉积与高温渗铜工艺制备了密度为2.01 g/cm^(3)的C/C-Cu复合材料。采用高温氧乙炔焰考察了复合材料的高温耐烧蚀性能,并利用X射线衍射仪(XRD)与扫描电子显微镜(SEM)对复合材料烧蚀前后的物相与微观结构进行了表征。结果表明:经20 s的氧乙炔焰烧蚀后,复合材料的线烧蚀率与质量烧蚀率分别为0.01 mm/s、0.0033 g/s。烧蚀过程中,由于铜的液化及气化会吸收大量的热量,对材料起到了较好的发汗冷却效果,因此,烧蚀后复合材料表面没有形成明显的烧蚀凹坑,且表面出现了大量毫米级Cu及其氧化物球状熔融颗粒。在烧蚀过渡区与烧蚀边缘区,由于残留球状熔融颗粒的发汗冷却作用,炭纤维与基体结构完好,未发生明显的烧蚀破坏痕迹。To improve the ablative property of C/C composites at high temperature,the C/C-Cu composites with a density of 2.01 g/cm^(3)are fabricated by chemical vapor deposition and copper vacuum-pressure infiltration methods.The ablative property of the C/CCu composites is investigated by using oxyacetylene flame.The phase compositions and micro-structure of the composites before and after ablation are examined by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results show that after 20 s of oxyacetylene flame ablation,the linear and mass ablation rates of the composites are 0.01 mm/s and 0.0033 g/s,respectively.Due to the liquefying and gasification of copper,a large amount of heat is absorbed during the ablation process,causing a sweat cooling effect on the composites.Therefore,no obvious ablation pits are observed in the ablation center,and a large number of millimeter-size spherical particles of Cu and its oxides are generated on the ablated surface.In the transition zone and the ablation rim,the carbon fibers and the matrix maintain the intact structure because of the sweat cooling effect of the remained molten spherical particles.

关 键 词：C/C-CU复合材料 耐烧蚀性能 烧蚀机理 

分 类 号：TB35[一般工业技术—材料科学与工程]