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iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Engineering > Department of Materials Science and Engineering > Faculty Research and Publications (MSE) > Ta2AlC and Cr2AlC Ag-based composites-New solid lubricant materials for use over a wide temperature range against Ni-based superalloys and alumina

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1649

Title: Ta2AlC and Cr2AlC Ag-based composites-New solid lubricant materials for use over a wide temperature range against Ni-based superalloys and alumina
Authors: Gupta, Surojit
Filimonov, D.
Palanisamy, T.
El-Raghy, T.
Barsoum, Michel W.
Keywords: MAX phases tribology;Solid lubricants;Composite lubricous materials
Issue Date: 2007
Publisher: Elsevier Science B.V.
Citation: Wear, 262(11): pp. 1479-1489.
Abstract: The tribological performances of the two new composite materials, consisting of the layered ternary carbides (MAX phases), Ta2AlC or Cr2AlC, and 20 vol.% Ag, were investigated in the temperature range from ambient to 550 ◦C against a Ni-based superalloy, SA (Inconel 718) and alumina counterparts. Over the entire temperature range, the wear rates, WRs, during dry sliding against the SA counterparts for the Ta2AlC–Ag and Cr2AlC–Ag composites were <5×10−5 and <10−4 mm3/Nm, respectively. The friction coefficients, μ, were <0.5. The WRs of the SA counterparts were also relatively low (<10−4 mm3/Nm). Under thermocycling conditions, the tribological performance of the MAX/Ag composites-Inc718 tribocouples got better with sliding distance. When the composites were tested against Al2O3, their WRs at moderate temperatures were also ≈10−5 mm3/Nm, but at 550 ◦CtheWRsincreased by about an order or magnitude. Both composites had tensile strengths, σt, >150MPa, compressive strengths, σc, >1.5 GPa at ambient temperature and σt > 100MPa at 550 ◦C. Their good tribological performance together with decent mechanical properties and machinability render them promising materials for various high temperature tribological applications.
URI: http://dx.doi.org/10.1016/j.wear.2007.01.028
http://hdl.handle.net/1860/1649
Appears in Collections:Faculty Research and Publications (MSE)

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