The effect of deposition pressure on the microstructure and ablation behavior of ZrB2 coatings deposited by very low pressure plasma spraying is investigated. The results show that under a chamber pressure less than 50 kPa; as the spray chamber pressure decreases; the porosity of the coating deposited at the same distance decreases; and the coating prepared under 100 Pa presents the lowest porosity of 1.79 %. Furthermore; among the ZrB2 coatings deposited at 100 Pa; 5 kPa; 10 kPa and 50 kPa; the dense coating deposited at 100 Pa showed the lowest ablation rate of 0.33 μm/s; 0.75±0.08 mg/s.

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