Effect of water based lubricants on wear of coated material

The effects of water base lubricants on wear of coated tools are examined by a crossed-cylinder wear test from environmental protection viewpoint. The lubricating property of pure water is inadequate. However, the addition of solid lubricant (melamine cyanuric acid adduct, MCA) to water, shows good tribological performance. Such a mixture provides the advantage of separating solid components from the water easily through filtration. The combined use of water base lubricant with addition of 10 wt.% MCA with Ti-base coated tool shows good tribological performance when in contact with carbon steel. The wear rate of Ti-base coated tool in contact with copper is very high. However, good performance results when the lubricant in this case is a combination of water with MCA and CrN or DLC coating.