Abstract:Although the 6150 steel has an excellent fatigue and impact resistance, it is unsuitable to operate it when the corrosion is a limited factor. We propose here a sequence of steel pre-treatment by carburizing, carbonitriding and nitriding in order to improve the poor adhesion between Diamond Like-Carbon coatings on steel. This sequence is our attempt to reduce the difference between the coefficients of thermal expansion of steel and DLC through the graded interface. This work demonstrates the quantitative analy… Show more
“…In As expected, the roughness of the TiN deposited by PVD system was low and follows the shape of the substrate, indicating that the coating has satisfactory adhesion. In the other hand, DLC is a new technology and needs better attention due adhesion issues that limits its use 15,16 , although is an interesting type of coating because of its high hardness and chemical inertness 17 . The DLC with 1 μm thickness shows satisfactory adhesion, and the interface between coating and substrate is clear, as shown in Figure 4.…”
Titanium nitride (TiN) coatings are widely used in machining because of its mechanical characteristics which modify the surface of the substrate increasing the capacity of load support and reduction of friction, while a coating as diamond-like carbon (DLC), which also has interesting mechanical properties, needs better attention. In this sense, the development of new coatings such as DLC is as important as wear analysis techniques. This work discusses the methods available to assess abrasive wear of coatings. For this, it has been used the data of the crater volume formed in ball cratering test and compared the difference between the specific wear coefficients of substrate and coating (ks and kc). These coefficients depend of the methods used for data analyses, thus, it has been used four equations to calculate ks and kc. Moreover, profilometry (pf) has been used to calculate the volumes, and thus ks and kc. Also, the roughness of the coatings, the thickness, the images corresponding to the crater formed, the coefficient of friction, the data obtained in wear tests due to the volume removed and, in the end, a comparison between ks and kc by different methods of data analyzes are presented.
“…In As expected, the roughness of the TiN deposited by PVD system was low and follows the shape of the substrate, indicating that the coating has satisfactory adhesion. In the other hand, DLC is a new technology and needs better attention due adhesion issues that limits its use 15,16 , although is an interesting type of coating because of its high hardness and chemical inertness 17 . The DLC with 1 μm thickness shows satisfactory adhesion, and the interface between coating and substrate is clear, as shown in Figure 4.…”
Titanium nitride (TiN) coatings are widely used in machining because of its mechanical characteristics which modify the surface of the substrate increasing the capacity of load support and reduction of friction, while a coating as diamond-like carbon (DLC), which also has interesting mechanical properties, needs better attention. In this sense, the development of new coatings such as DLC is as important as wear analysis techniques. This work discusses the methods available to assess abrasive wear of coatings. For this, it has been used the data of the crater volume formed in ball cratering test and compared the difference between the specific wear coefficients of substrate and coating (ks and kc). These coefficients depend of the methods used for data analyses, thus, it has been used four equations to calculate ks and kc. Moreover, profilometry (pf) has been used to calculate the volumes, and thus ks and kc. Also, the roughness of the coatings, the thickness, the images corresponding to the crater formed, the coefficient of friction, the data obtained in wear tests due to the volume removed and, in the end, a comparison between ks and kc by different methods of data analyzes are presented.
“…provides an accurate existence percentage for hydrogen atoms in films, and the hydrogen atom contents for various films have been quantified 45) . X-ray diffraction (XRD) is not so major for such film analysis, but the residual stress in films has been quantified in the past studies 1,[46][47][48] . XRD is excellent for quantitative analysis of bonding structures because it enables the number of sp 2 and sp 3 bonds to be individually estimated in principle if the pair distribution functions can be obtained because the atomic distances in sp 2 and sp 3 bonding structures differ.…”
Amorphous carbon films have several outstanding tribology characteristics, including high hardness, surface smoothness, and low friction. Under tribological conditions, their surface is generally exposed to high-temperature and pressure. Although the structure of amorphous carbon films is likely changed by high temperature and pressure, there have been no reports on such structural changes of the films. To obtain information about their structural changes, synchrotron X-ray diffraction was used to analyze two kinds of amorphous carbon films, a-C:H and a-C:H:Si, under high-temperature and high-hydrostatic pressure conditions. Synchrotron X-ray diffraction was applied to films pressurized by a multi-anvil press installed in the PF-AR NE5C beamline at KEK at room temperature and at a high-temperature around 200ºC. The pair distribution functions derived by Fourier transformation of the obtained scattering intensity profiles showed that the sp 2 /sp 3 ratios for both films decreased as the pressure increased and that the sp 2 /sp 3 ratio for the a-C:H film increased as the
“…Despite its relatively limited corrosion resistance, carbon steel is used in large tonnages in marine applications, chemical processing, petroleum production and refining, construction and metal processing equipment 1,2 . The economic consequences of corrosion of iron and its alloys in various industrial sectors, including oil and gas operations, are investigated 3 . There are different ways to control corrosion including inhibitors, coatings, applying anodic/cathodic protection and proper design 4 .…”
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