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Effect of Applied Load and Surface Roughness on the Tribological Properties of Ni-Based Superalloys Versus Ta2AlC/Ag or Cr2AlC/Ag Composites
Journal article   Peer reviewed

Effect of Applied Load and Surface Roughness on the Tribological Properties of Ni-Based Superalloys Versus Ta2AlC/Ag or Cr2AlC/Ag Composites

D. Filimonov, S. Gupta, T. Palanisamy and M. W. Barsoum
Tribology letters, v 33(1), pp 9-20
2009
DOI: https://doi.org/10.1007/s11249-008-9384-4

Abstract

Chemistry and Materials Science Corrosion and Coatings Materials Science Nanotechnology Original Paper Physical Chemistry Surfaces and Interfaces Theoretical and Applied Mechanics Thin Films Tribology
The novel Ta 2 AlC–20 vol.% Ag (TaAg) and Cr 2 AlC–20 vol.% Ag (CrAg) composites were tribologically tested versus a Ni-based superalloy Inc718 (SA) by dry sliding at a sliding speed of 1 m/s at room temperature in air at loads from 3 N to 18 N. The TaAg composites were also tested at 8 and 18 N at 550 °C, and at a 3 N load against the SA with different surface roughnesses at 26 °C and 550 °C. At room temperatures, the coefficients of friction, μ’s, decreased from ~0.8–0.9 to ~0.3–0.4 for both the TaAg and CrAg composites as the applied normal force increased from 3 N to 8 N. Further increases in load to 18 N did not change the μ’s. The specific wear rates, sWR, increased with increased loads for the TaAg composite; they remained almost unchanged for the CrAg composite. This behavior was attributed to the formation of glaze tribofilms—similar to ones observed previously in these tribocouples at elevated temperatures and 3 N—promoted by the increased loads. Preconditioning of the SA surface by sliding against the TaAg composite at 550 °C and 8 N resulted in μ’s of <0.2 and sWR < 10 −6  mm 3 /N-m in subsequent room temperature sliding at 3 N. Somewhat higher, but stable room temperature μ’s of ~0.3 and sWR of ~3 × 10 −5  mm 3 /N-m were observed when the TaAg composites were slid versus a sandblasted SA surface at 500 °C and 3 N. It follows that in situ preconditioning of the tribo-surfaces is a powerful tool for improving the properties of the MAX/Ag-SA tribocouples. The relationship between sliding conditions, chemistries of tribofilms, and their properties are discussed.

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Industry collaboration
Domestic collaboration
Web of Science research areas
Engineering, Chemical
Engineering, Mechanical
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