Preparation and ablation properties of C/C-SiC composites
Received date: 2017-02-27
Online published: 2017-12-30
C/C-SiC composites were prepared by adding SiC powder to the carbon felt performed before chemical vapor infiltration (CVI) and precursor infiltration pyrolysis (PIP) using slurry spraying. The micro structure of composites was studied with XRD and SEM. Ablation performance of the composites was investigated using H2-O2 flame ablation equipment. The results show that C/C-SiC composites had better anti-ablative performances compared with C/C composite after ablation for 500 s when SiC content of C/C-SiC composite is 9%. Linear and mass ablation rates of (C-SiC)f/C composites decreased by 63% and 76% respectively. At the ablation center zone, ablation of composites is most serious. The ablation mechanism is dominated by sublimation and mechanic aerosion, accompanied
by oxidation. In the ablation transitional zone, molten SiO2 could heal cracks and holes and other defects, and effectively prevent oxidizing atmosphere into the materials, making the materials exhibit excellent ablation. The main ablation mechanism was thermo-oxidation and H2-O2 flow shear erosion. In the ablation marginal zone, composites were ablated slightly. The main ablation mechanism was thermo-oxidation ablation.
Key words： C/C-SiC composites; H2-O2 flame ablation; SiC powder; slurry spraying
ZUO Yazhuo, LI Hong, GENG Zhenzhen, WANG Shaolei, YANG Min, REN Musu, SUN Jinliang . Preparation and ablation properties of C/C-SiC composites[J]. Journal of Shanghai University, 2017 , 23(6) : 841 . DOI: 10.12066/j.issn.1007-2861.1905
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