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- W4248415375 abstract "The tribological properties of diamond-like carbon (DLC) coatings produced by pulsed laser deposition (PLD) are investigated. Films are grown onto steel substrates to 0.5 μm using a 248 nm laser to ablate graphite and polycarbonate targets in high vacuum. Chemical bonding is studied with Raman, XPS and EELS techniques; mechanical and tribological properties are evaluated using microindentation and ball-on-disk friction tests. Coatings grown from graphite targets are amorphous DLC (a-C), while those grown from polycarbonate targets are amorphous hydrogenated carbon (a-C:H). The hardness of the a-C coatings is 55–70 GPa and the hardness of the a-C:H coatings is 12–20 GPa depending on the substrate bias. Friction coefficients of the coatings against steel and sapphire balls are determined in several environments: in air as a function of relative humidity, in dry nitrogen, and in 10 Pa vacuum. For a-C coatings, the friction coefficients are typically below 0.1 and are as low as 0.03 in dry nitrogen. In wear tests, a critical contact pressure of 1.4 GPa led to catastrophic adhesive failure of a-C coatings, whereas failure of a-C:H coatings is by wear-through after 5 x 103 cycles. Extremely low wear rates of 10−9 mm3 N−1 m−1 are found for a-C coatings at the contact pressure of 0.8 GPa." @default.
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- W4248415375 date "1995-12-01" @default.
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- W4248415375 title "Mechanical and tribological properties of diamond-like carbon coatings prepared by pulsed laser deposition" @default.
- W4248415375 doi "https://doi.org/10.1016/02578-9729(50)25219-" @default.
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