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Fabrication and Characterization of Plasma-Sprayed Cr3C2-25 Cr/Al2O3-40TiO2 Duplex Coating
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DOI：10.1007/s11666-022-01423-y.png)
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Abstract
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The atmospheric plasma spray process is considered here as a suitable techniques for fabricating ceramic coatings. The duplex coating system consists of two layers: Cr3C2-25NiCr (as bond coat) and Al2O3-40TiO(2) (as top coat). Plasma spraying parameters including spraying distance (100-200 mm), powder feed rate (10-50 g/min), and arc current (500-600 A) were used to fabricate this coating system on a S45C steel surface. The effect of plasma spraying parameters on coating properties and structure was evaluated. The experimental results showed that the optimal operating conditions provided the lowest value of coating porosity (similar to 4%), corrosion current density i(co)(rr) (similar to 6.12 mu A/cm(2)), HV0.1 microhardness (similar to 846) at 10 g/min powder feed rate, 100 mm spraying distance, and 600 A current. The sample sprayed at 30 g/min powder feed rate, 150 mm spray distance, and 550 A arc current had the highest value of coating adhesion (similar to 55 MPa). The results of X-ray diffraction analysis on the surface of the coating samples showed that most TiO2 crystals were dissolved in gamma-Al2O3 to form a solid Al2TiO5 solution. [GRAPHICS] .
Keywords:
Al2O3-TiO2
Cr3C2-25NiCr
cermet
bilayer coating
plasma spray
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