With the newly developed portable DZ9000 supersonic oxygen gas flame spraying system, the ideal spray coating of Cr2O3 powder with different particle size range is obtained. By testing the microstructure and performance of the coating, it is proved that the system sprays different particle size Cr2O3 powders, and the coatings have no obvious layered structure; the coarse-grained powder coating has a larger porosity than the fine-grained powder coating; the coarse-grained powder coating The microhardness of the layer is higher; the particle size of the powder has little effect on the phase structure of the coating.
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