J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (4): 345-354.DOI: 10.1016/j.jmst.2014.11.021

• Orginal Article • Previous Articles     Next Articles

Effect of SiC Location on the Ablation of C/C-SiC Composites in Two Heat Fluxes

Lei Liu, Hejun Li*, Kui Hao, Xiaohong Shi, Kezhi Li, Chang Ni   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2014-05-25 Online:2015-04-20 Published:2015-07-23
  • Contact: Corresponding author. Prof., Ph.D.; Tel.: +86 29 88495004; Fax: +86 29 88492642.
  • Supported by:
    This work is supported by the National Natural Science Foundation of China under Grant No. 51402238 and 51221001, the Fundamental Research Foundation of Northwestern Polytechnical University under Grant No. GBKY1021, the Research Fund of State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 25-TZ-2009) and the ‘‘111’’ Project under Grant No. B08040.

Abstract: How layer-segregated distribution of SiC affects the ablation of C/C-SiC composites was studied in the present work. A certain amount of SiC particles was deposited at the non-woven (C/C-SiC-1) and web (C/C-SiC-2) layer of 2D needle-punched carbon fibre fabric reinforced pyrocarbon composites, respectively. Ablation under oxyacetylene torch demonstrated that the two composites have similar ablation rates in heat flux of 2.38 MW/m2 whereas ablation rates of C/C-SiC-2 were much higher than those of C/C-SiC-1 when heat flux was 4.18 MW/m2. SiO2 covered partially the defective surface of both composites in the lower heat flux. The different SiC locations induced distinct defects and then led to the two composites' dissimilar ablation rates in the higher heat flux.

Key words: C/C composites, SiC, Distribution, Ablation performance