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Ephemeral memories dlc12/29/2023 The frictional coefficient values of the MAOB coating were similar to those of the MAO coating using dry sliding tests, while the B-coating on the MAO-coated surface significantly improved the wear resistance of the AZ91D Mg alloy. Compared with the MAO-coated sample, the corrosion current density of the MAOB-coated Mg alloy decreased by two or three orders of magnitude and no corrosion phenomenon was observed during a long-term immersion test of about 500 h (severe corrosion pits were found for MAO-treated samples after about 168 h of immersion). The results show that a dense 92 m thick B-coating was tightly deposited onto the MAO-coated Mg alloy and exhibited a good mechanical interlock along the rough interface. The structure, composition, corrosion resistance, and tribological behaviour of the coatings were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electrochemical and long-term immersion test, and ball-on-disc friction test. The film showed good wear resistance and biocompatibility.Ī duplex coating (called MAOB coating) was fabricated on AZ91D Mg alloy by combining the process of micro-arc oxidation (MAO) with baking coating (B-coating). This result shows that the PIXE technique can be applied to identify and evaluate the incorporation of bioactive elements by W-DLC films. PIXE measurements revealed the presence of Ca and P in the W-DLC film after immersion in Hanks' solution. EIS measurements suggest that this behavior was closely related to the corrosion attack through the coating pores. The corrosion resistance of the stainless steel substrate decreased in the presence of the PVD layer. The in vitro biocompatibility of the W-DLC film was evaluated by cytotoxicity tests. The wear behavior was assessed using the sphere-on-disc geometry. The film structure was analyzed by X-ray diffractometry and micro-Raman spectroscopy. Particle induced X-ray emission (PIXE) measurements were performed to evaluate the incorporation of potentially bioactive elements from the physiological solution. The corrosion stability of a W-DLC coated surgical AISI 316L stainless steel in Hanks' solution has been evaluated. In order to achieve the low and stable friction of the DLC coating with the W-DLC layer on AISI316L, it is necessary to improve the smoothness of the surface and the adhesion between the DLC coating and the W-DLC layer. During the friction studies, the top DLC layer was removed from the adhesive W-DLC layer because the adhesive strength at this part was not enough. This was due to wear debris which had risen to the friction surface resulting in unstable friction on the DLC-1 coating. The observed friction of the DLC-1 coating was unstable compared with the DLC-2 or DLC-3 coatings. Friction tests were performed using a rotation-type ball-on-flat configuration tribometer. This feature was derived from the surface roughness of the initial surface of the AISI316L substrate. The surface roughness of the DLC-1 coating was greater than that of the DLC-2 coating. At the boundary between the W-DLC layer and the AISI316L substrate, microscopic decohesion or delamination was not observed. The structural characterizations were performed by transmission electron microscopy and tapping mode atomic force microscopy. In this study, three types of coatings were evaluated: DLC/W-DLC on AISI316L (DLC-1), DLC/W-DLC on Si wafer (DLC-2), and DLC on Si wafer (DLC-3). Methane and argon gases were used as the precursor of the coatings. The coatings were deposited onto AISI316L steel substrates and Si wafers using plasma enhanced chemical vapor deposition and tungsten co-sputtering of the metal target. Tribological properties of a diamond-like carbon (DLC) coating with an adhesive tungsten-containing DLC (W-DLC) layer were investigated.
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