Premium
Nd‐YAG Laser Nitriding of t‐Zirconia
Author(s) -
Kathuria Yash P.
Publication year - 2007
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200731802
Subject(s) - nitriding , materials science , cubic zirconia , raman spectroscopy , yttria stabilized zirconia , tetragonal crystal system , nitrogen , layer (electronics) , diffraction , metallurgy , indentation hardness , analytical chemistry (journal) , crystallography , composite material , crystal structure , microstructure , chemistry , optics , ceramic , physics , organic chemistry , chromatography
Surface nitriding of yttria (Y 2 O 3 ) stabilized tetragonal zirconia (t‐ZrO 2 ) 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‐ZrO 2 and the treated one. Nitrogen atoms enter in ZrO 2 substituting oxygen atoms in the network. X‐Ray diffraction and Raman spectra show an efficient transformation of the t‐ZrO 2 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‐ZrO 2 into cubic zirconia ( c ‐ZrO 2 ) beneath deep in the bulk due to nitrogen concentration gradient.