Obtaining and characterization of high hardness layerson Ductile Irons by means of Thermoreactive Diffusion techniques
DOI:
https://doi.org/10.46842/ipn.cien.v24n2a09Keywords:
ductile iron, niobium carbide, scanning electron microscopy, thermoreactive diffusion, XRDAbstract
This research describes the work carried out to generate layers, with a significant presence of high hardness niobium carbide, on a pearlitic matrix ductile iron, by means of thermoreactive diffusion techniques (TRD). The processes were carried out using a borax bath at 950 and 1025°C for 4 and 6 hours. The substrates were characterized by atomic emission spectroscopy, optical microscopy, scanning electron microscopy. The deposited layers were characterized by vickers microhardness tests, scanning electron microscopy and X-ray energy dispersive spectrometry (EDS) and X-ray diffraction. The hardness values of coatings of the order of 2600 Vickers with thickness close to 25 µm, where the EDS analysis shows mainly the presence of Fe, Nb and V. The process represents a lower cost and more environmentally friendly alternative to technologies such as CVD and is considered an attractive option to provide greater wear resistance (and other characteristics), to ductile iron.
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