Infrared radiative performance and ablation resistance of coatings sprayed with Pr6O11 core–shell-structured ZrB2-SiC powders

Shao Pu Liu, Zhuang Ma*, Yanbo Liu*, Shizhen Zhu, Ling Liu, Jun Jie Xu, Ze Zhang, Huanyu Chi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To improve the ablation resistance of carbon/carbon (C/C) composites, ZrB2-SiC coatings sprayed with Pr6O11 core–shell-structured ZrB2-SiC powders were prepared via atmospheric plasma spraying. The phase composition, microstructure, infrared radiative performance, and ablation resistance of the powders and coatings were investigated. The results show that the Pr6O11 shell is uniformly distributed around the induction plasma spheroidization-treated (IPS) ZrB2-SiC powder and reduces the formation of low-emissivity phases, such as ZrO2 and SiO2, induced by oxidation during spraying. Stripe-shaped Pr6O11 appears in the coatings as a sealing phase, and the emissivity of the modified coating improves due to the high emissivity of Pr6O11. When the molar percent of Pr6O11 is 10 %, the coating indicates the highest emissivity (i.e. 0.94) in the 3–6 μm band at 750 °C. During a 60 mm-180 s oxyacetylene torch test, the surface temperature of the coating modified with 10 % Pr6O11 decreases by 150 K and reaches 1923 K owing to its high emissivity, resulting in minimal volatilization in the sealing phase. Furthermore, the mass ablation and linear ablation rates of the coating above are 1.67 × 10−4 g/s and 1.82 × 10−4 mm/s, respectively, which are 34 % and 42 % lower than those of unmodified coating. These results confirm that the introduction of Pr6O11 can increase the emissivity of the coating in the 3–6 μm band and provide considerable ablation protection for the C/C composites.

Original languageEnglish
Pages (from-to)3879-3889
Number of pages11
JournalCeramics International
Volume51
Issue number3
DOIs
Publication statusPublished - Jan 2025

Keywords

  • Ablation resistance
  • Carbon/carbon composites
  • Coating
  • Infrared emissivity
  • PrO

Fingerprint

Dive into the research topics of 'Infrared radiative performance and ablation resistance of coatings sprayed with Pr6O11 core–shell-structured ZrB2-SiC powders'. Together they form a unique fingerprint.

Cite this