摘要
通过对炭/炭复合材料(C/C)和添加难熔金属碳化物炭/炭复合材料(C/C+MC)的微观结构对比分析,研究了二者在电弧加热器上的烧蚀机理。结果表明,难熔金属化合物(MC)在烧蚀过程中进入到距表层几个微米之内的纤维和基体炭微晶内,明显影响了相邻微晶的形貌。MC的存在,一方面,加大了机械剥蚀等力学因素引起的质量损失,增大了试样表面粗糙度,从而进一步加重了烧蚀;另一方面,MC具有降低碳的升华总量的效应。从综合效应来看,C/C+MC复合材料的烧蚀速率比C/C复合材料高。
The microsmlctures of carbon/carbon composites （C/C） and refractory metal carbide-doped car bon/carbon composites （ C/C ＋ MC） were compared to elucidate their ablation mechanism in an arc jet heater. It was found that refractory metal carbides （MC） entered the crystallites of the composites to a depth of several mi- crons from the ablated surface and obviously influenced the texture around them. The existence of MC aggravated not only the weight loss caused by mechanical peeling off but also the surface roughness of the samples. As a result, the ablation speed of C/C ＋ MC was higher than that of C/C although MC decreased the total quantity of sublimed carbon.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期9-13,共5页
New Carbon Materials
