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• W2034873903 abstract "5 µm thick CrN–Ag composite layers with 22 at.% Ag were deposited by reactive magnetron co-sputtering on 440C stainless steel substrates. Increasing the growth temperature from Ts = 500 to 600 to 700 °C leads to Ag segregation within the CrN matrix and the formation of embedded lamellar Ag aggregates with increasing size, < 105, 9 × 106, and 7 × 107 nm3, respectively. Ball-on-disk tests against 100Cr6 steel, followed by optical profilometry and energy dispersive spectroscopy, indicate that the Ag grains for Ts = 500 °C are too small to facilitate an effective lubricious surface layer, resulting in a friction coefficient μ = 0.58 and a composite coating wear rate of 3.8 × 10− 6 mm3/Nm that are nearly identical to those measured for pure CrN with μ = 0.64 and 3.6 × 10− 6 mm3/Nm. The Ts = 600 °C coating exhibits a Ag concentration which is 15% higher within than outside the wear track, and acts as a lubricious layer that reduces μ to 0.47 and yields a 16× and 2.4× lower wear rate for coating and counterface, respectively. Ts = 700 °C leads to a dramatic increase in surface roughness and an associated increase in friction, μ = 0.85, and wear, 9.9 × 10− 6 mm3/Nm. Replacing the steel counterface with an alumina ball results in the lowest μ = 0.50 for Ts = 500 °C, attributed to the presence of Ag and the relatively low hardness of 16.5 GPa for this particular coating. In contrast, friction and wear increase dramatically for Ts = 600 °C, which is attributed to a breakdown of the lubricious Ag layer by the harder counterface. The transient friction coefficient μt during experiments with continuously increasing testing temperature Tt = 25–700 °C initially decreases for all samples, attributed to drying of the environment and an effective softening of both coating and counterface. For the Ts = 500 °C coating, a temperature activated solid lubricant transport yields a lubricious Ag surface layer and a very low μt = 0.05 at Tt ~ 500 °C. All coatings exhibit an increasing μt for Tt > 500 °C, which is attributed to oxidative degradation." @default.
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• W2034873903 date "2010-01-01" @default.
• W2034873903 modified "2023-10-06" @default.
• W2034873903 title "CrN–Ag nanocomposite coatings: Tribology at room temperature and during a temperature ramp" @default.
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• W2034873903 doi "https://doi.org/10.1016/j.surfcoat.2009.09.018" @default.
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