Control of the hydrophobicity of rare earth oxide coatings deposited by solution precursor plasma spray by hydrocarbon adsorption  

作　　者：Pengyun Xu Guohui Meng Larry Pershin Javad Mostaghimi Thomas W.Coyle 

机构地区：[1]Centre for Advanced Coating Technologies,University of Toronto,Toronto,ON M5S 3G8,Canada

出　　处：《Journal of Materials Science & Technology》2021年第3期107-118,共12页材料科学技术（英文版）

基　　金：supported by Natural Science and Engineering Research Council Canada Discovery Grants Program(No.RGPIN-2015-06377(TWC));Natural Science and Engineering Research Council Canada Green Surface Engineering for Advanced Manufacturing(Green-SEAM)Strategic Network。

摘　　要：The basis of the hydrophobicity of lanthanide rare earth oxides(REOs)has been the subject of considerable debate.To explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_(2)o_(3)(one of the REOs)coatings and non-REO Al_(2)o_(3)coatings deposited via solution precursor plasma spray process were investigated in this work.The Yb_(2)o_(3)coatings were subjected to a number of post-deposition treatments including vacuum(1-15 Pa)treatment,Ar-plasma treatment,heat treatment(400℃),long-time air exposure and ultra-high vacuum(1×10^(-7)Pa)treatment.Subsequent characterization showed that different post-deposition treatments resulted in different wetting behavior for the Yb_(2)o_(3)coatings which correlated with the content of hydrocarbon on the surface.Yb_(2)o_(3)coatings exhibited reversible transitions between superhydrophobicity after vacuum treatment and superhydrophilicity after Ar-plasma or heat treatment,linked to hydrocarbon adsorption onto and desorption from the surface.Yb_(2)o_(3)coatings after long-time air exposure and ultra-high vacuum treatment both remained hydrophilic and showed a smaller hydrocarbon content than coatings after vacuum treatment.Al_(2)o_(3)coatings with hierarchical surface structures similar to the Yb_(2)o_(3)coatings showed an increase in WCA to only-170 after the same vacuum treatment,indicating the REO has a much higher affinity for hydrocarbon adsorption than Al_(2)o_(3),and that the content of hydrocarbon adsorbed on the surface of the REO determined the wetting behavior.

关 键 词：Rare earth oxide HYDROPHOBICITY Solution precursor plasma spray Post-deposition treatments 

分 类 号：TB306[一般工业技术—材料科学与工程]