The invention relates to a preparation method of a carbon material surface
boride-modified
silicon-based antioxidation
coating layer, and belongs to a preparation method of a carbon material surface high-temperature antioxidation
coating layer. The preparation method of the antioxidation
coating layer comprises the following steps of firstly, preparing a
boride MB2
slurry with controllable content, wherein M in MB2 is Zr (
zirconium), Ta (
tantalum) or Hf (
hafnium); brushing, impregnating or spraying a preset layer of MB2
slurry to the surface of a carbon material substrate with an SiC (siliconcarbide) inner coating layer; after the preset layer is obtained, performing superhigh-temperature heat treatment
sintering, so as to obtain the coating layer. The preparation method is characterizedin that by regulating, controlling and designing a proportional ratio of the
slurry powder of
composite ceramic, the content of component in the MB2-SiC (M is Zr, Ta or Hf) coating layer can be controlled; by controlling the brushing, impregnating or spraying times, the thickness of the MB2-SiC (M is Zr, Ta or Hf) coating layer can be controlled; the preset layer is subsequently subject to superhigh-temperature
sintering heat treatment, so that the density of the coating layer is improved, and the
bonding strength of interface of the inner coating layer is improved. The preparation method hasthe advantages that the preparation technology is simple, the coating layer is dense and uniform, the production cost is lower, and the preparation method is suitable for carbon material parts with various shapes and sizes.