Highly hydrophobic ceramic coatings produced by plasma spraying of powder materials
I.P. Gulyaev, V.I. Kuzmin, O.B. Kovalev
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: plasma spraying, suspension plasma spraying, diagnostics of two-phase flow, ZrO, bimodal surface structure, wetting angle, superhydrophobicity, highly hydrophobic coating
Abstract
Hydrophobic and highly hydrophobic zirconium oxide coatings are obtained by air-plasma spraying of powder and suspension materials. The proposed method and the developed equipment make it possible to obtain nanostructured surfaces with water-repellent properties. The high hydrophobicity of the coating is achieved by creating a hierarchical texture of its surface obtained by the combined method of plasma spraying of powder and liquid-phase materials. The developed surface of the coating based on zirconium oxide ZrO2 obtained by the method of sequential plasma spraying of micropowders (with 20-40 μm microparticle sizes) and liquid materials in the form of suspensions (with 50-100 nm nanoparticle sizes) makes it possible to increase the water-wetting angle up to 145 degrees.
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