Deniz Harp Okulu

In this study, the wear and friction behavior of cathodic arc phys. vapor deposited AlTiSiN+TiSiN coatings on H13 tool steels were investigated by using CrN, TiN and AlCrN interlayers with tribometer tests both under unlubricated and boundary lubricated conditions. 6 mm alumina balls were used as counter surfaces to test ceramic hard coatings.Surface coatings were characterized through nanoindentation, SEM coupled with an energy-dispersive X-ray spectrometer (SEM/EDXS), optical profilometry, and at. force microscopy (AFM) techniques.The results showed that especially AlTiSiN+TiSiN coating with TiN interlayer resulted in a much more enhanced tribol. performance of the tool steels at both unlubricated and the boundary lubricated conditions even at elevated contact pressures.

In a recent issue of the Revista Española de Enfermedades Digestivas, we read with interest the article by Coskun et al. "The diagnostic value of a globulin/platelet model for evaluating liver fibrosis in chronic hepatitis B patients". However, we wanted to emphasize some points about the article.