Tribological properties of TiN/diamond and TiAlN/diamond bilayer films sliding against carbon steel

Abstract

In this study, the tribological properties of the monolayer micro-crystalline diamond and nano-crystalline diamond films, TiN/diamond and TiAlN/diamond bilayer films on cemented tungsten carbide substrates are evaluated by dry sliding against the medium carbon steel counterpart balls, in terms of the coefficient of friction, wear rate, worn surfaces, and chemical transitions in the contacting wear zones. The significant coefficient of friction reducing effect of top-layer TiN and TiAlN coating only happens on the nano-crystalline diamond film, where the stable coefficient of friction of TiN/nano-crystalline diamond or TiAlN/nano-crystalline diamond bilayer coating reduces 9% or 53% compared with the nano-crystalline diamond film. The formed ionic metal oxides such as Fe 2 O 3 or Fe 3 O 4 coming from the chemisorbing of the atmospheric molecular water, oxygen in the air and the delamination of steel ball due to the repeated friction interaction is supposed to be responsible for the coefficient decreasing effect. The TiN or TiAlN film on diamond layer exhibits lower positive wear rate compared with the TiN or TiAlN film itself, due to the load support ability improvement resulted from the high hardness of diamond interlayers. Among all the tested hard films, the TiAlN/nano-crystalline diamond bilayer coating exhibits the valid potential to be the optimized tool coating in carbon steel machining in terms of its low coefficient of friction and wear rate, which may come from the self-lubricated transfer tribolayer formation on the TiAlN layer, as well as the enhanced mechanical supporting capacity of the underneath smooth and hard nano-crystalline diamond interlayer.

Experimental study on the effect of surface texture on tribological properties of nanodiamond films under water lubrication

“…At a magnification of 50 times, a Zeiss optical microscope was used to observe the wear surface of the friction ball to calculate the wear rate of the ball according to the wear condition. The wear rate of the WC–Co ball can be calculated by equation (1) 39,40 : where K is the specific wear rate of the ball, F is the applied load, S is the sliding distance (in meters), d is the diameter of the near-circular friction zone of the ball, and r is the radius of the ball.…”