Wettability of Atmospheric Plasma Sprayed Fe, Ni, Cr and Their Mixture Coatings

Wetting behaviors of plasma sprayed Fe, Ni, Cr and their mixture coatings were investigated. The contact angle of water droplets on the surfaces increases with time when the surfaces are exposed to air, with the highest value greater than 150°. To the best of our knowledge, this is the first report that superhydrophobicity can be achieved by one step plasma spraying. It is found that the feedstock particle size distribution has a significant influence on the coating morphology. For the mixture coating, a micro/submicro dual scale roughness is obtained. The carbon content in the surface is found increasing with time. Results of X-ray diffraction, X-ray photoelectron spectroscope analysis and heat treatment in CO2/Ar atmospheres suggest that the surface may contain some active ferrites which can decompose carbon dioxide into carbon. The origin of the superhydrophobicity is attributed to the accumulation of surface carbon materials and the dual scale roughness.

[1]  Lili Zheng,et al.  Melting and oxidation behavior of in-flight particles in plasma spray process , 2005 .

[2]  Zexiang Shen,et al.  Reversible UV-light-induced ultrahydrophobic-to-ultrahydrophilic transition in an alpha-Fe2O3 nanoflakes film. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[3]  F. Xuan,et al.  Microstructural and porosity variations in the plasma-sprayed Ni-alloy coatings prepared at different spraying powers , 2009 .

[4]  D. Stöver,et al.  Improving Powder Injection in Plasma Spraying by Optical Diagnostics of the Plasma and Particle Characterization , 2010, International Thermal Spray Conference.

[5]  T. Qiu,et al.  Effects of Surface Chemistry on Splat Formation During Plasma Spraying , 2008, International Thermal Spray Conference.

[6]  Xian‐Cheng Zhang,et al.  Porosity and effective mechanical properties of plasma-sprayed Ni-based alloy coatings , 2009 .

[7]  Michael Nosonovsky,et al.  Multiscale roughness and stability of superhydrophobic biomimetic interfaces. , 2007, Langmuir : the ACS journal of surfaces and colloids.

[8]  J. Rühe,et al.  Some thoughts on superhydrophobic wetting , 2009 .

[9]  Y. Zheng,et al.  Microstructure and properties of Fe-based amorphous metallic coating produced by high velocity axial plasma spraying , 2009 .

[10]  Neelesh A. Patankar,et al.  On the Modeling of Hydrophobic Contact Angles on Rough Surfaces , 2003 .

[11]  Ghislain Montavon,et al.  From Powders to Thermally Sprayed Coatings , 2010 .

[12]  S. Peng,et al.  Reduction of carbon dioxide into carbon by the active wustite and the mechanism of the reaction , 1999 .

[13]  Lidong Zhao,et al.  Influence of the spraying processes on the properties of 316L stainless steel coatings , 2003 .

[14]  S. Lee,et al.  Study on porosity of plasma-sprayed coatings by digital image analysis method , 2004, Thermal Spray 2004: Proceedings from the International Thermal Spray Conference.

[15]  P. Basheer,et al.  Microstructural and mechanical properties of nickel-base plasma sprayed coatings on steel and cast iron substrates , 2005 .

[16]  Bharat Bhushan,et al.  Natural and biomimetic artificial surfaces for superhydrophobicity, self-cleaning, low adhesion, and drag reduction , 2011 .

[17]  P. Munroe,et al.  Study of the Splat Microstructure and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed onto Stainless Steel Substrates , 2010 .

[18]  Pierre Fauchais,et al.  Understanding plasma spraying , 2004 .

[19]  Lichao Gao,et al.  The "lotus effect" explained: two reasons why two length scales of topography are important. , 2006, Langmuir : the ACS journal of surfaces and colloids.

[20]  S. Peng,et al.  Studies on the decomposition of carbon dioxide into carbon with oxygen-deficient magnetite I. Preparation, characterization of magnetite, and its activity of decomposing carbon dioxide , 2000 .

[21]  P. Munroe,et al.  Study of the Splat Microstructure, Splat-Substrate Interface, and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed on to Aluminum Substrates , 2010 .

[22]  Yutaka Tamaura,et al.  Complete reduction of carbon dioxide to carbon using cation-excess magnetite , 1990, Nature.

[23]  P. Munroe,et al.  Effects of Substrate Roughness on Splat Formation for Ni-Cr Particles Plasma Sprayed onto Aluminum Substrates , 2010 .

[24]  C. Ding,et al.  Microstructure and mechanical properties of Al2O3–Al composite coatings deposited by plasma spraying , 2008 .

[25]  W. Marsden.  I and J , 2012 .

[26]  刘维民,et al.  Superhydrophobic surfaces: from natural to biomimetic to functional , 2011 .

[27]  Fu-chi Wang,et al.  Microstructure and Electrochemical Behavior of Fe-Based Amorphous Metallic Coatings Fabricated by Atmospheric Plasma Spraying , 2010, International Thermal Spray Conference.

[28]  Peter Englezos,et al.  Patterned superhydrophobic metallic surfaces. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[29]  M. Khedr,et al.  Reduction of carbon dioxide into carbon by freshly reduced CoFe2O4 nanoparticles , 2006 .

[30]  P. Ctibor,et al.  Microstructure and abrasion resistance of plasma sprayed titania coatings , 2006 .

[31]  S. Sampath,et al.  Three-dimensional simulation of plasma spray: effects of carrier gas flow and particle injection on plasma jet and entrained particle behavior , 2004 .

[32]  Erkki Levänen,et al.  Wetting behaviour of plasma sprayed oxide coatings , 2006 .

[33]  S. Kuroda,et al.  Comparison of oxidation behavior of Ni–20Cr alloy and Ni-base self-fluxing alloy during air plasma spraying , 2009 .

[34]  Satoshi Takeda,et al.  Surface OH group governing adsorption properties of metal oxide films , 1999 .

[35]  M. Khedr,et al.  CO2 decomposition over freshly reduced nanocrystalline Fe2O3 , 2007 .