Methods of coating a surface and articles with coated surface

A method of coating a substrate, comprising:

• feeding a feedstock to a thermal spray torch, the feedstock comprising a liquid carrier and a plurality of ceramic particles disposed in the carrier, wherein at least 50% of the particles in the plurality have a diameter less than about 2 microns;
• disposing the feedstock on the substrate by a suspension plasma spray process under conditions selected to produce a textured surface comprising a hierarchical structure, wherein the hierarchical structure comprises agglomerations of at least partially melted and solidified ceramic particles derived from the feedstock with individual at least partially melted and solidified particles derived from the feedstock disposed on a surface of the agglomerations;
• and
• applying a low surface energy modification material over the textured surface.

An article, comprising:

• a component having a coated surface comprising a coating, wherein the coating comprises
• a first layer, wherein the first layer comprises a textured surface comprising a hierarchical structure comprising agglomerations of at least partially melted and solidified particles derived from a feedstock with individual at least partially melted and solidified particles derived from the feedstock disposed on a surface of the agglomerations;
• and
• a second layer, wherein the second layer comprises a low surface energy material disposed on the textured surface.