Oxidation of TaB2-SiC coatings prepared by spark plasma sintering and effect of pre-oxidation treatments

To suppress the oxidation of TaB2-SiC coatings, the effects of pre-oxidation temperature on the oxygen hindering properties of TaB2-SiC coatings were investigated to prepare TaB2-SiC coatings with enhanced oxidation behavior. The addition of 40 wt% TaB2 made the oxygen permeability of the coating decrease by 62.16%. However, excessive TaB2 weakened the oxygen hindering ability of the coating due to the large ion complex ability of Ta5+. The pre-oxidation temperature at 1500 & DEG;C led to a homogeneous dispersion of Ta-oxide nanocrystal particles in the Ta-B-Si-O complex-phase glass layer. In contrast with the untreated samples, the active factor and inert factor values of the TaB2-SiC coating after pre-oxidation treatment at 1500 & DEG;C decreased by 43.12% and 17.33%, respectively, which improved the dynamic stability of the coating during oxidation.

Automated summary

The effects of pre-oxidation temperature on TaB2-SiC coatings were studied, showing that the addition of appropriate amount of TaB2 can reduce oxygen permeability, and pre-oxidation at 1500°C helps improve the oxidation stability of the coating.