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Tribological Behavior of Ti2SC at Ambient and Elevated Temperatures

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The tribological properties of Ti2SC were investigated at ambient temperatures and 550°C against Ni-based superalloys Inconel 718 (Inc718) and alumina (Al2O3) counterparts. The tests were performed using a tab-on-disk method at 1 m/s and 3N (≈0.08 MPa). At room temperature, against the superalloy, the coefficient of friction, , was ∼0.6, and at ∼8 × 10−4 mm3·(N·m)−1 the specific wear rate (SWRs), was high. However, against Al2O3, at ∼5 × 10−5 mm3·(N·m)−1 and ∼0.3, the SWRs and  were significantly lower, which was presumably related to more intensive tribo-oxidation at the contact points. At 550°C, the Ti2SC/Inc718 and Al2O3 tribocouples demonstrated comparable 's of ∼0.35–0.5 and SWRs of ∼7–8 × 10−5 mm3·(N·m)−1. At 550°C, all tribosurfaces were covered by X-ray amorphous oxide tribofilms. At present, Ti2SC is the only member of a family of the layered ternary carbides and nitrides (MAX phases) that can be used as a tribo-partner against Al2O3 in the wide temperature range from ambient to 550°C.

Document Type: Research Article


Affiliations: 1: Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104 2: Honeywell International Inc., Morristown, New Jersey 07962 3: 3-ONE-2, Voorhees, New Jersey 08043

Publication date: 2007-11-01

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