Journal
TRIBOLOGY INTERNATIONAL
Volume 43, Issue 3, Pages 685-693Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2009.10.008
Keywords
Scratch resistance; Automotive clearcoat; Nano silica and viscoelastic properties
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Scratches are a consequence of tribological events encountered by automotive coatings during their service lives. A series of analytical techniques such as laboratory carwash simulator, nano-indentation, tensile, DMTA, SEM, etc. were used in order to compare the effects of addition of various contents of a nano silica on changes in the viscoelastic properties and scratch morphologies of the resultant clearcoats. The results illustrate, that incorporating increased amounts of hydrophobic nano silica particles into an automotive clearcoat decreased its T-g whilst increasing its toughness. Increasing nano silica content also gave progressive transitions from fracture type scratches to plastic type scratches, (C) 2009 Elsevier Ltd. All rights reserved.
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