Abstract
As for the air plasma sprayed ZrB2-based coatings, B content change caused by inevitable oxidation is predictable but commonly ignored. Affected by air plasma flame, the B element loss and residual B2O3 in the sprayed ZrB2 coating were observed. Moreover, how the B content change affects the microstructure, phase evolution, and ablation resistance (2.4 MW/m2, 60 s) of ZrB2-based coatings with different secondary phases (SiC, MoSi2, and TaC) was investigated. The B element loss contributed to the increase in surface temperature and the decline in the sintering degree of the ZrO2 layer. The evaporation of residual B2O3 caused damage to the coating structure in the form of pores, whose negative effect was enhanced and reduced by MoSi2 and TaC secondary phases, respectively. This work will provide some insight into thermally sprayed non-oxide ceramic coatings in the atmosphere.
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