J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (1): 77-82.DOI: 10.1016/j.jmst.2014.01.015

• Orginal Article • Previous Articles     Next Articles

Ablative and Mechanical Properties of C/C-ZrC Composites Prepared by Precursor Infiltration and Pyrolysis Process

Kezhi Li*, Jing Xie, Hejun Li, Qiangang Fu   

  1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2013-11-19 Online:2015-01-20 Published:2015-07-23
  • Contact: * Corresponding author. Prof., Ph.D.; Tel./Fax: +86 29 88495764; E-mail address: likezhi@nwpu.edu.cn (K. Li).
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 51221001 and 51272213), the Foundation for the Author of National Excellent Doctoral Dissertation of China201036, the Research Fund of State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 25-TZ-2009) and the “111” Project (Grant No. B08040).

Abstract: C/C-ZrC composites with continuous ZrC matrix were prepared by precursor infiltration and pyrolysis process using zirconium-containing polymer. Ablation properties of the composites were investigated by oxyacetylene flame with heat flux of 2380 and 4180 kW/m2, respectively. The results showed that C/C-ZrC composites exhibited excellent ablation resistance under the heat flux of 2380 kW/m2 for 120 s and a tree-coral-like ZrO2 protective layer formed after ablation. However, when the heat flux increased to 4180 kW/m2, the maximum temperature of ablated surface reached 2500 °C and a strong degradation of ablation resistance was observed due to the weak bonding between the formed ZrO2 layer and the composites. The flexural strength of C/C-ZrC composites was 110.7 ± 7.5 MPa. There were a large number of carbon fiber bundles pull-out, and the composites exhibited a pseudo-plastic fracture behavior.

Key words: C/C composites, Ceramic-matrix composites, Ablation performance, Mechanical properties