Effect of ablative angles on the ablation behaviors of ZrB2-SiC modified carbon/carbon composites

JOURNAL OF ALLOYS AND COMPOUNDS

卷:745

Article

Wang, Chuang^1,2  Li, Ke-zhi²  Lu, Ying²  Peng, Lei¹  Li, Bingliang¹  Zhao, Zhigang² 

[1] Shaanxi Railway Inst, Shaanxi Prov Engn Lab High Performance Concrete, Weinan 714099, Peoples R China

[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710072, Shaanxi, Peoples R China

关键词: Carbon/carbon;    Ceramic-matrix composites;    Ablative angle;    Morphology;   

DOI  :  10.1016/j.jallcom.2018.02.228

来源: Elsevier

【 摘 要 】

To analyze the effect of different ablation angles on the ablative property of carbon/carbon(C/C) composites modified by ZrB2-SiC, C/C-ZrB2-SiC composites (ZS) were prepared via precursor infiltration and pyrolysis (PIP). The prepared composites (ZS) were then ablated by oxyacetylene flame at 90 degrees and 0 degrees angles (ZS-90 degrees and ZS-0 degrees), respectively. The results show that, at ZS-0 degrees angle, the ablation resistance was worse due to the existence of turbulent flame. The temperature in the inner cone and the gas flow velocity at ZS-0 degrees were higher than those at ZS-90 degrees. At ZS-90 degrees, the damage of the composites was dominated by the thermo-chemical ablation. The ablation mechanism at ZS-0 degrees was mainly the mechanical denudation with the thermo-chemical ablation as supplement. The dissimilar ablation angles of the C/C-ZrB2-SiC composites under the oxyacetylene flame resulted in the distinct ablation resistance on the surfaces, hence different ablation mechanisms. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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