Tribology Transactions · 1999 · 37 citations · 12 references
EngineeringMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsSurface ScienceTribologyBearing TribologyCoatingsLubricant PropertiesSurface CoatingsTribological MaterialsWear-resistant MaterialsAir BearingsBearing FrictionFrictionHigh-temperature LubricationLubricating MaterialsLubricationSolid LubricantsWear Testing
The tribological properties of one chrome oxide and one chrome carbide based solid lubricant coating were evaluated in a partial-arc foil bearing at 25° and 500°C. Start/stop bearing operation up to 20,000 cycles were run under 10 kPa (1.5 psi) static deadweight load. Bearing friction (torque) was measured during the test. Specimen wear and SEM/EDS surface analyses were conducted after testing to understand and elucidate the tribological characteristics observed. The chrome oxide coating which contains both Ag and BaF2/CaF2for low and high temperature lubrication, exhibited low friction in sliding against Al2O3 coated foils at 25° and 500°C. The chrome carbide coating, which lacked a low temperature lubricant but contained BaF2/CaF2 as a high temperature lubricant, exhibited high friction at 25°C and low friction at 500°C against both bare and Al2O3 coated superalloy foil surfaces. Post test surface analyses suggest that improved tribological performance is exhibited when a lubricant film from the coating transfers to the foil surface.
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Advances in Thin Film Sensor Technologies for Engine Applications
Jih-Fen Lei, Lisa C. Martin · Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award · 1997 · 65 citations · Full text
Engineering, Aerospace Engineering, Materials Engineering +17
Christopher DellaCorte, Brian J. Edmonds · NASA STI Repository (National Aeronautics and Space Administration) · 1995 · 62 citations · Full text