Abstract
Friction measurements have been performed on microcrystalline, ultrananocrystalline, and diamond-like carbon (DLC) films with natural diamond counterfaces in the temperature range of 8 K to room temperature. All films exhibit low friction (μ≤0.1) in air at room temperature. In ultrahigh vacuum, microcrystalline diamond quickly wears into a high friction state (μ≈0.6), which is independent of temperature. DLC has low friction even at the lowest temperatures. In contrast, friction in ultrananocrystalline films has a significant temperature dependence, with a broad transition from a low to a high friction state between 120 and 220 K observed on both heating and cooling. The role of hydrogen transport in determining the temperature dependence of friction is discussed.
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