Possible Applications of Self-Decomposing ilntermetallic Fe-AIType Powders in the Form of HVOF and D-Gun Spraying ProtectiveCoatings

摘要

The possibilities of practical applications of self-decomposing Fe-AI powders to form protective, heat resistant, intermetallic Fe-AI type coatings obtained by HVOF and D-gun spraying methods were analyzed. The morphology, microstructure, micro-hardness and phase, as well as chemical homogeneity were investigated, directly after the powders forming and milling process. It was found that the intermetallic alloys powders from Fe-AI phase diagram, obtained by self-decomposition technique, even with near granulation, contain different morphology, and the powders are characterized by wide range of chemical composition in specific particles. Moreover, it was observed that morphology of powder particles may change as a result of milling and as a effect of aging after self-decomposition process. Simultaneously, it was confirmed that, in the selected range of 38-75 μm, the particle morphology differences of investigated powders do not affect the DGS process as well as the application properties of obtained coatings.