Morphology of the silicon carbide surface after micro cutting of molybdenum

The present research was carried out when molybdenum was micro cut by green silicon carbide crystals. The top of the crystal is cone-shaped with an apex angle of 120° and a radius of curve of 25–30 microns. After the micro cutting, a wear site is formed on the surface of the silicon carbide crystal that is covered with nearly parallel micro cracks. The width of the micro cracks is up to 0.4 microns, the depth is 3–5 microns. The depth of the micro cracks is measured on a micro cross-sectional vertical wall obtained by ion etching of a selected portion of the surface directly in the chamber of the electron microscope Versa 3D. It has been found that molybdenum fills the majority of the cracks formed at the wear site. It penetrates to the depth of 2–3 microns when the crack width at the metal penetration boundary is about 40 nm. The presence of molybdenum and the penetration depth is determined by local micro X-ray spectral analysis. The metal may adhere to the surface of the wear site and form patches. The rate of molybdenum transfer onto the wear site of the silicon carbide crystal is substantially less than when micro cutting titanium and niobium.

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