Oxidation inhibition behaviors of the HfB2-SiC-TaSi2 coating for carbon structural materials at 1700 °C

Oxidation inhibition behaviors of the HfB2-SiC-TaSi2 coatings fabricated by spark plasma sintering method were investigated at 1700 degrees C. The inerting protection capability and volume expansion effect of TaSi2 is conducive to inhibiting the active oxidation of SiC and loosening of HfB2 at 1700 degrees C, enhancing the structural blocking ability of the coatings. The dispersion of dual transition metal Hf/Ta-oxide nanocrystalline particles were accelerated by the autogenous separation of TaSi2 and exogenous exfoliation of SiO2 glass to form the Hf-Ta-B-Si-O compound glass layer, which conduce to decrease oxygen permeability of the compound glass layers and enhance oxidation protection efficiency of the coatings.