Abstract
Diamond is a great importance material for the industry because of its physical and chemical properties. One of the applications that it is utilized a large scale is the cutting of ornamental rocks. This activity exposes them to ideal conditions for the occurrence of two phenomena responsible for the wear of the crystals: oxidation and graphitization. With the objective of reducing this problem, diamonds with coating were developed. However, it is not clear the protective capability of the coatings. In this work, diamonds without the coating and with titanium carbide (TiC) coating were exposed to degradable conditions and had their results compared. Both diamonds were heat-treated at 1200 °C along different periods of time and characterized prior to and after the treatments. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were utilized to investigate the behavior of diamonds at high temperatures. In order to, evaluate the structures present in the samples, it was used X-ray diffraction. Scanning electron microscopy (SEM) was employed with the objective to observe details on the diamond surface. Confocal laser microscopy was utilized to analyze the roughness of the diamond. The results illustrate the protective capacity of the TiC coating and explain this mechanism.
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