热解炭涂层对C/C复合材料高温氧乙炔焰烧蚀性能的影响  

Effect of pyrolytic carbon coating on ablation resistance of C/C composites under oxyacetylene torch flame

作　　者：杨鑫[1,2] 苏哲安[1] 黄启忠[1] 柴立元[2] 殷腾[1] 房啸[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学冶金科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2013年第4期585-593,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB605801);中国博士后科学基金资助项目(2012M511752;2013T60776);中央高校基本科研业务费专项资金资助项目;中南大学自由探索计划资助项目(2012QNZT004);中南大学贵重仪器设备开放共享基金资助项目(CSUZC2012026)

摘　　要：采用化学气相沉积工艺在C/C复合材料表面制备热解炭涂层,利用扫描电镜以及能谱仪等分析手段研究涂层的结构,通过氧乙炔焰烧蚀试验考察热解炭涂层对C/C复合材料高温耐烧蚀性能的影响。结果表明:在C/C复合材料表面沉积热解炭涂层可显著提高材料的短时高温耐烧蚀性能。经过20 s的高温氧乙炔焰烧蚀后,与无热解炭涂层的C/C复合材料试样相比,涂层试样的线烧蚀率和质量烧蚀率分别下降26.92%和75.76%。在烧蚀中心区,热解炭涂层完全被烧蚀损耗掉;在烧蚀过渡区,涂层表现为局部烧穿;而在烧蚀边缘区,涂层表面烧蚀后形成了众多的烧蚀孔洞,呈现出蜂窝状的结构形貌。烧蚀过程中,涂层的烧蚀机制以热氧化和燃气冲刷为主。Ablation resistant pyrolytic carbon coating was prepared on C/C composites surface by chemical vapor deposition（CVD） technology.The structure of the coating was studied by scanning electron microscope（SEM） and energy dispersion spectrometer（EDS） analysis,and the effect of the coating on ablation resistance of C/C composites was investigated by oxyacetylene torch flame test.The results show that the prepared pyrolytic carbon coating can effectively improve the ablation resistance of C/C composites in short time ablation.Compared with C/C composites without coating,the linear ablation rate and mass ablation rate of the coated C/C composites after 20 s ablation reduce 26.92% and 75.76%,respectively.In the ablation center,the pyrolytic carbon coating was ablated or scoured completely;in the transitional field,partial of the coating was ablated;while in the ablation rim,ablation holes that revealed as honeycomb structure were formed on the coating surface.In the ablation process,the ablation mechanism of the coating is mainly controlled by thermo-oxidation and scouring.

关 键 词：C C复合材料 耐烧蚀涂层 热解炭 氧乙炔焰烧蚀 

分 类 号：TB332[一般工业技术—材料科学与工程]