Sliding wear performance of TiAl-based nitride coatings deposited on ADI by cathodic arc deposition and plasma based ion implantation and deposition

Abstract

This work studied the sliding wear performance of TiAl-based nitride coatings synthesized on austempered ductile iron (ADI) by cathodic arc deposition (CAD) and plasma-based ion implantation and deposition (PBIID). Monolayer CAD TiAlN films and bilayer CAD and PBIID TiAl/TiAlN films deposited on an experimental device were analyzed and benchmarked against a commercial bilayer CAD film. Sliding wear was evaluated in a pin-on-disc tribometer. Two test conditions were employed, one intended to prevent damage (low load, short distance) and another intended to promote damage (higher load, longer distance). Regarding low load tests, all coated samples showed friction coefficients of 0.40-0.45 and negligible wear. Regarding high load tests, all coated variants exhibited lower or equal disc and pin wear rates with respect to uncoated ADI. In addition, coated samples displayed steady-state friction coefficients between 0.2 and 0.6 while uncoated ADI steady-state coefficients between 0.6 and 0.85.

Thin TiN coating on NiTi substrate through PVD method: Improvement of the wear resistance

“…Surface lubricity, coefficient of friction, microhardness and elastic modulus were improved by controlling the carbon content. Colombo et al [22] reported that TiAlN-coated iron samples displayed steady-state friction coefficients between 0.2 and 0.6 lower than that of the uncoated samples. Larsson et al [23] studied the mechanism of coating failure in TiN-coated steel.…”