OBRABOTKAMETALLOV Vol. 26 No. 2 2024 technology The results of the study of the phase composition of the initial powders are summarized in Table 3. The results of the study of the particle size distribution of the initial powders are summarized in Table 4. Figure 4 shows the SEM images of the experimental coating specimens sections. A 5 µm thick coating of Fe2O3 powder was formed on St3 steel (Figure 4, a). The contact zone between the coating and the substrate has no defects or microcracks, which indicates high strength of the joint. The coating applied from a composition of Al2O3 + 10 % Fe2O3 powders (Figure 4, b) is continuous, without chipping, bubbles and through cracks. The thickness of the obtained coating is 50 µm. When studying the structure of the coating formed from the composition of powders Ti + 10 % Fe2O3 (Fig. 4, c), it was found that it has a developed lamellar structure with a large number of interphase boundaries. The coating is dense, there are no cracks and pores, and the coating thickness is 5 µm. The results of energy dispersive spectroscopy are summarized in Table 5. Ta b l e 3 Phase composition of the initial powders Name, grade Phase Spatial group PTS-1 powder Ti 194:P63/mmc Powder PDAAl2O3 γ-Al2O3 227:Fd3m Powder extra-pure 2-4 Fe2O3 α-F2O3 167:R-3c Ta b l e 4 Granulometric composition of the initial powders Name, grade Particle size distribution, µm d(10) d(50) d(90) Ti powder, PTS-1 9.54 24.69 50.76 Powder Al2O3 2.28 19.96 46.36 Powder Fe2O3 0.23 5.54 27.9 a b c Fig. 4. Microstructure and morphology of the cross-section surface of experimental coating samples: Fe2O3 (a), Al2O3 + 10% Fe2O3 (b), Ti + 10% Fe2O3 (c)
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