RT Journal Article
T1 Functionalizing organic powder coatings with nanoparticles through ball milling for wear applications
A1 Fernández Álvarez, María
A1 Velasco López, Francisco Javier
A1 Bautista Arija, María Asunción
A1 Galiana Blanco, Beatriz
AB Epoxy powder coatings were functionalized with nanosilica to improve wear resistance. Ten different organic coatings were studied: 0.25&-1% (by wt.) of SiO2 nanoparticles (both hydrophilic -HL- and hydrophilic -HB-) were added to epoxy powders. The homogeneity of the distribution of the silica nanoparticles in the epoxy powder matrix was achieved with an innovative ball-milling mixing method. This homogeneity was confirmed through transmission electron microscopy (TEM) observations. Powder coatings were sprayed and cured on steel sheets. The wear resistance of the coatings was evaluated in reciprocating wear equipment, measuring the depth and the width of the wear tracks obtained by an optoelectronic microscopy. Results reveal very significant improvement in wear resistance, with the best wear performance being observed for the epoxy reinforced with 0.75%HB SiO2 nanoparticles. This is related to the enhanced crosslinking of the matrix in the coatings due to SiO2, as shown by the mechanical properties. The curing kinetics of the functionalized epoxy powders was studied by non-isothermal differential scanning calorimetry (DSC). Activation energies (Ea) calculated from DSC are related to in the diffusion-controlled reactions.
PB Elsevier
SN 0169-4332
YR 2020
FD 2020-05-30
LK https://hdl.handle.net/10016/31828
UL https://hdl.handle.net/10016/31828
LA eng
NO The authors acknowledge Cubson International Consulting for their help with the coating process. This work was supported by Interreg SUDOE, through the KrEaTive Habitat project, grant number SOE1/P1/E0307 and the Spanish Ministry of Science, Innovation and Universities (MICINN) through the Spanish project RTI2018-101020-B-100.
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RD 1 sept. 2024