Abstract
Surface nitriding of yttria (Y2O3) stabilized tetragonal zirconia (t-ZrO2) has been performed using the pulsed Nd-YAG laser irradiation in the nitrogen atmosphere. The results show modification of the crystallographic structure between the original t-ZrO2 and the treated one. Nitrogen atoms enter in ZrO2 substituting oxygen atoms in the network. X-Ray diffraction and Raman spectra show an efficient transformation of the t-ZrO2 at the surface that exhibits typical yellow-gold color of ZrN with high hardness and wear resistance. The hardness measured with Vickers indenter yields a high value of 1410 HV. Nitriding is accompanied by the formation of a few micron thick gradient layer of ZrN structure on the top and a partial transformation of t-ZrO2 into cubic zirconia (c-ZrO2) beneath deep in the bulk due to nitrogen concentration gradient.
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