J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (10): 996-1002.DOI: 10.1016/j.jmst.2016.06.019

• Orginal Article • Previous Articles     Next Articles

Effect of Monolithic LaB6 on the Ablation Resistance of ZrC/SiC Coating Prepared by Supersonic Plasma Spraying for C/C Composites

Jia Yujun,Li Hejun(),Li Lu,Fu Qiangang(),Li Kezhi   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2016-02-23 Accepted:2016-06-14 Online:2016-10-10 Published:2016-11-05
  • Contact: Li Hejun,Fu Qiangang

Abstract:

Ablation resistance of monolithic LaB6-doped ZrC coating for SiC-coated carbon/carbon composites by supersonic atmospheric plasma spray was investigated under an oxyacetylene torch with a heat flux of 4.18 MW/m2. Result shows that ZrC coating with 10 vol.% LaB6 has a good ablation resistance compared with pure ZrC, ZrC with 20 vol.% LaB6 and SiC-doped ZrC coating. After ablation for 15 s, the weight is increased by 1.12 mg/s. The good ablation resistance is ascribed to the formation of a stabilized scale which consists of protective La2Zr2O7-containing molten phase and ZrO2 particles keeping the integrity of the coating.

Key words: Ceramic coating, C/C composites, Ablation performance