| abstract |
A coated substrate comprising: a substrate; a first layer on at least a portion of the substrate, the first layer comprising: - a polymer selected from the group consisting of an acrylic, an epoxy, a polyurethane, a copolymer thereof and a mixture thereof and - a selected additive of the group consisting of an ultraviolet (UV) light absorber, a UV stabilizer and a mixture thereof; a second layer on at least a portion of the first layer, the second layer comprising: a polysiloxane polymer, a polyurethane polymer, an epoxy polymer, a copolymer thereof or a mixture thereof and having a higher hardness than that of the first layer; and a third layer on at least a portion of the second layer, the third layer comprising: a silicon-based layer, a boron-based layer, an aluminum-based layer, a zirconium-based layer, a base of chromium, a layer based on tantalum, a layer based on titanium, diamond-like carbon and / or diamond-like carbon doped with silicon and / or the like and having a higher hardness than that of the second layer, wherein the Hardness is measured using an MTS Nanoindentor XP (available from MTS Systems Corporation) using a Berkovich diamond tip that has trigonal geometry, measurements are made using an indentation depth of 4 μm, a tension speed of 0.05 s-1 , a harmonic displacement of 2 nm, a frequency of 45 Hz and an assumed Poisson's ratio of 0.35, a depth of 0.2 to 0.3 μm is used to determine the average values. |