Abstract
LaB6-modified MoSi2-SiC (MSL) oxidation resistant coating was designed and successfully fabricated on SiC-coated carbon/carbon (C/C) composites using efficient supersonic atmospheric plasma spraying (SAPS) method. The MSL coating protected the C/C composites from static oxidation at 1773 K for 100 h with a mass loss of 6.52 mg cm−2 and dynamic ablation about 2023 K for six cycles with a mass loss of 29.86 mg cm−2, which was superior to the MoSi2-SiC (MS) coating without La-doping. The presence of rare earth La element promoted the liquid phase sintering of MoSi2 and B element facilitated the high-temperature stability of SiO2-rich glass scale, resulting in the formation of La-Si-O-B compound scale with a low volatility and oxygen permeability cover the coating surface, which contributed to improving the resistant to oxidative response of the MSL coating.
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