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Ta2AlC and Cr2AlC Ag-based composites-New solid lubricant materials for use over a wide temperature range against Ni-based superalloys and alumina
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http://hdl.handle.net/1860/1649
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| 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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