Journal
SURFACE & COATINGS TECHNOLOGY
Volume 300, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.05.028
Keywords
Carbon/carbon composites; ZrB2-SiC-ZrC coating; Supersonic atmosphere plasma spraying; Ablation; Layered structure
Funding
- National Natural Science Foundation of China [51272213, 51521061]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [98-QZ-2014]
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To improve the ablation resistance of carbon/carbon (C/C) composites at high temperature, a ZrB2-SiC-ZrC coating was prepared on the surface of SiC-coated C/C composites by supersonic atmosphere plasma spray (SAPS). Ablation resistance of the coated C/C composites was tested in an oxyacetylene torch environment with a heat flux of 2400 kW/m(2) for 120,150 and 200 s, respectively. After ablation for 120 s, the coating exhibited a three layered structure consisting of a porous ZrO2 layer, a ZrO2-SiO2 thin layer and a SiC-depleted layer, whereas it transformed into a two-layered structure (ZrO2 recrystallized layer and ZrO2-SiO2 layer) after ablation for 150 s. With the increase of ablation time, the SiC inner coating was almost consumed and a gap emerged between the ZrO2 layer and the C/C matrix after ablation for 200 s. The good ablation resistance of the sprayed coating is mainly attributed to the layered structure acting as a thermal barrier and inhibiting inward diffusion of oxygen. (C) 2016 Elsevier B.V. All rights reserved.
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