Dynamic oxidation protective ultrahigh temperature ceramic TaB2-20%wtSiC composite coating for carbon material

Abstract TaB 2 –20%wtSiC composite coating containing high content of TaB 2 was synthesized by liquid phase sintering method to enhance the anti-oxidation property of the carbon materials. The coated sample exhibits a trend of sustained weight gain whose final value is about 1.35%, while there is no weight loss zone in weight loss rate curves, but a rapid weight gain region around 800 °C. The generated compound glass layer presents a structure of Ta-oxides/Ta B Si O/SiO 2 triple glass layer. The rough surface of top Ta-oxides layer increases the oxidation defensive area of the glass layer, while the self-sealing Ta B Si O/SiO 2 compound glass ceramics layer can arrest the microcracks, blocking the fast diffusion channel of oxygen.