Abstract
Yttria-stabilized hafnia is shown to be another transformation toughening ceramic with good tribological properties. The hafnia was rf-diode sputtered over a 300 nm chromium underlayer on textured aluminum-NiP 130 mm diameter substrates. Wear properties of the hafnia overcoat were evaluated, via contact start-stop (css) testing, as a function of oxygen partial pressure, substrate bias potential and argon pressure. Depending on deposition conditions, a wide range of wear properties were observed. Lower oxygen partial pressures <1×10−4 Torr, produced the lowest average friction levels of 0.4–0.5 after 30 000 css. Use of simultaneous substrate bias during deposition, produced hafnia overcoats with relatively high friction levels of 0.7–0.9 after 30 000 css. TEM micrographs revealed some microcracking of the overcoats along texture lines.
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