Effects of deposited microstructure on wear behaviors of detonation sprayed Fe-based amorphous coatings

Fe-based amorphous coatings (AMCs) were deposited using the detonation spray at varying spraying distances. The study aimed to characterize the deposition morphologies and elemental composition of splats for single shots under different spraying distances. Additionally, the relationship between spraying distance, particle deposition behavior, spreading morphology, and wear behavior of the coatings was comprehensively discussed. The results indicate that modifying the spraying distance affects the melting state of spray particles, thereby influencing the morphology of deposition and determining the coating`s microstructure. Larger spraying distances result in reduced deposition efficiency and lead to particles depositing in a manner similar to cold spraying, resulting in an uneven coating structure with higher porosity. Consequently, the coating becomes more susceptible to fatiguedelamination wear. Conversely, a moderate spraying distance leads to full melting and acceleration of powders, results in good spreading and the formation of a uniform and dense laminar structure.