Design and optimization of oxidation resistant coating for C/C aircraft brake materials

Shangwu Fan, Xu Ma, Zuo Li, Jing Hu, Zan Xie, Juanli Deng, Litong Zhang, Laifei Cheng

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A SiCN/borosilicate glass anti-oxidation coating with double-layer structure was designed for C/C aircraft brake materials. The SiCN layer was introduced as transition layer to improve the wettability between borosilicate glass and C/C composites, and the microstructure results indicated that the coating with SiCN inner layer was dense and uniform. The oxidation resistance evaluation of the coated samples was conducted at 800 °C in air for 10 h. The weight loss of SiCN/borosilicate glass coated samples valued ~ 5.66% indicated that the oxidation resistant property of the simple SiCN/borosilicate glass coating was not good, which was mainly due to the relative large viscosity of borosilicate glass at 800 °C. B4C was introduced to add into the outer glass coating to improve the self-healing ability of the coating. After oxidized at 800 °C in air for 10 h, the weight loss of the SiCN/borosilicate glass-B4C coated samples was ~ 2.48%. B4C could consume the oxygen diffused into the coating and the reacted product B2O3 with a better fluidity at 800 °C could effectively heal cracks and pores in the coating to improve the oxidation resistance property. The reaction of B4C oxidized to B2O3 was accompanied with ~ 1.5 times volume expansion, which was also beneficial for the healing of defects.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalCeramics International
Volume44
Issue number1
DOIs
StatePublished - Jan 2018

Keywords

  • C. Anti-oxidation property
  • D. BC
  • D. Borosilicate glass
  • E. C/C brake

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