Journal
SURFACE & COATINGS TECHNOLOGY
Volume 357, Issue -, Pages 48-56Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.09.060
Keywords
Supersonic atmospheric plasma spraying; Coating; Hafnium boride; Carbon/carbon composite; Ablation resistance
Funding
- National Natural Science Foundation of China [5172780072, 51672223, 51502028]
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In order to improve the ablation resistance of carbon/carbon (C/C) composites, hafnium boride (HfB2) coatings were prepared on the surface of SiC-coated C/C composites by supersonic atmospheric plasma spraying (SAPS). The anti-ablation property was investigated in an oxyacetylene torch environment under different heat flux. The phase composition, surface and cross-section microstructure and ablation behavior of the prepared coated C/C composites were characterized by using X-ray diffraction and scanning electron microscopy equipped with energy dispersion spectroscopy. The HfB2 coating exhibited excellent ablation resistance under 2400 kW/m(2) after ablation for 30 s and no obvious penetrated crack and critical defect could be observed in the coating. The increase of ablation rates with the formation of rugged surface structure and pores indicated that HfB2 coating suffered more serious mechanical denudation and thermochemical erosion. The formation of protective glassy Hf-O layer with low oxygen permeability, generated due to the oxidation of HfB2 phase, inhibited the inward diffusion of oxygen and improved remarkably the ablation resistance of C/C composites.
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