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The sintered specimens were subjected to accelerated ageing in deionized water at 134 °C for up to 48 h and verified in terms of the amount of the transformed monoclinic fraction, the thickness of the transformed layer, and the bi-axial flexural strength.
From the analysis of the thickness of the transformed layer and surface roughness, σ⁎, of various DLC coatings, we observed that the friction coefficient of the DLC under oil boundary lubrication was determined by the possibility of breaking the transformed layer.
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The purpose of this study was to develop a quantitative method for measuring the thickness of the transformed layer in hydrogen-free DLC (ta-DLC) and two types of hydrogenated DLC coatings.
Consequently, we observed that there were optimum ranges of wavelengths and optical models for measuring the transformed layer of the DLC.
As a consequence, it exhibited the fastest linear aging kinetics accompanied by more extensive micro-cracking of the transformed layer, as well as largest amount of intergranular fracture and the greatest resistance to fracture.
However, there are few reports on such layers, especially the transformed layer in oil lubrication, because this transformed layer could be too thin to be measured quantitatively.
The transferred or transformed layer, which has a high sp2 carbon content induced by cyclic friction, results in an ultralow friction coefficient in ambient air.
The spectroscopic reflectometry technique has been applied to measure the thickness of the transformed layer of the DLC's wear scar after friction under oil boundary lubrication.
Then, we clarified the friction model of these DLC coatings under oil lubrication as the transformed layer was the solid lubricant film.
Each of the three transformed layers is composed of one low-pass subband and three high frequency images.
Chung, et al [18], conclude that the wear coefficient in ambient room temperature is lower than 80°CC in water conditions and explain that the protective nature of the tribologically transformed layers could decrease the wear volume.
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