Abstract
The use of ceramic nanoparticles in coatings can significantly improve their mechanical properties such as hardness, adhesion to substrate, and scratch and abrasion resistance. A successful enhancement of these properties depends strongly on the coating formulation used, and the subsequent structure formed during coating. The aim of the present work was to enhance the adhesion between nanoparticulate coatings and stainless-steel substrates. A covalent particle structure was formed and better mechanical properties were achieved by modifying alumina nanoparticles, as well as substrates, with 3-aminopropyltriethoxysilane and by using a formulation consisting of solvent, modified particles, and bisphenol-A-diglycidylether as cross-linking additive. In addition to the adhesion force needed to remove the coating from the substrate, the type of failure (adhesive or cohesive) was characterized to gain a deeper understanding of the structure formation and to identify interdependencies between process, formulation, and coating structure properties. The modification process and the formulation composition were varied to achieve a detailed conception of the relevant correlations. By relating the results to other structural properties, such as the theoretical porosity and thickness, it was possible to understand the formation of the coating structure in more detail.
Highlights
The use of ceramic nanoparticles in coatings can significantly improve their mechanical properties such as hardness, adhesion to substrate, and scratch and abrasion resistance
APTES–ethanol butvarious processed with various coating speeds achieve achieve different wet film thicknessessolution and ligand concentrations on the to substrate different film3thicknesses various ligand concentrations on themodified substratenanoparticles surfaces
Figure surfaces. wet Figure shows an and exemplary cross-section of a coating with and shows an exemplary of a coating with modified nanoparticles andthe cross-linking cross-linking additivecross-section on a stainless-steel substrate, which was modified with maximumadditive coating on a stainless-steel substrate, wasobtained modifiedwith withathe maximum coating speedeach (v = 500 mm/min)
Summary
The use of ceramic nanoparticles in coatings can significantly improve their mechanical properties such as hardness, adhesion to substrate, and scratch and abrasion resistance. A successful enhancement of these properties depends strongly on the coating formulation used, and the subsequent structure formed during coating. The aim of the present work was to enhance the adhesion between nanoparticulate coatings and stainless-steel substrates. A covalent particle structure was formed and better mechanical properties were achieved by modifying alumina nanoparticles, as well as substrates, with 3-aminopropyltriethoxysilane and by using a formulation consisting of solvent, modified particles, and bisphenol-A-diglycidylether as cross-linking additive. In addition to the adhesion force needed to remove the coating from the substrate, the type of failure (adhesive or cohesive) was characterized to gain a deeper understanding of the structure formation and to identify interdependencies between process, formulation, and coating structure properties. The use of strategystrategy has already shownshown the potential to increase the the hardness and scratch resistance of nanoparticulate alumina coatings by cross-linking hardness and scratch resistance of nanoparticulate alumina coatings by cross-linking primary primary particles andaggregates aggregates[8]
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