Abstract
For better understanding on effects of ablation environmental factors (oxygen partial pressure P(O2) and gas flow scouring), multiple experiments and multiscale simulations based on thermally sprayed ZrC-TaC system were conducted. High P(O2) was found helpful to accelerate Ta2O5/ZrO2 mutual diffusion by variable P(O2) oxidation at 1500 ℃ (5-50 kPa). Effects of gas flow scouring was evaluated by flow filed simulation coupling laser and oxyacetylene ablations, from which its promotion effect on Ta2O5/ZrO2 diffusion efficiency was found. The increased Ta2O5/ZrO2 diffusion efficiency will accelerate the structure instability of Ta doped c-ZrO2 skeletons due to Zr-O bond length extension around Ta atoms.
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