Abstract
To protect carbon/carbon (C/C) composites against oxidation, zirconium diboride–silicon carbide (ZrB2–SiC) coating was prepared by in-situ reaction using ZrC, B4C and Si as raw materials. The in-situ ZrB2–SiC coated C/C presented good oxidation resistance, whose weight loss was only 0.15% after isothermal oxidation at 1500°C for 216h. Microstructure evolution of coating at 1500°C was studied, revealing a two-layered structure: (1) ZrO2 (ZrSiO4) embedded in SiO2-rich glass, and (2) unaffected ZrB2–SiC. The formation and collapse of bubbles influenced the coating oxidation greatly. A model based on the evolution of oxide scale was proposed to explain the failure mechanism of coating.
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