Nitriding of tetragonal zirconia in a high current d.c. plasma source

Surface nitriding of tetragonal zirconia (t-ZrO2) has been performed with the aim of combining the optical properties of zirconium nitride (ZrN) with the hardness and toughening properties of tetragonal zirconia. A high current d.c. arc plasma source has been used to create a reactive environment of atomic hydrogen and NH radicals. Plasma analysis showed that a highly reductive atmosphere is necessary to transform the tetragonal zirconia. X-ray diffraction and transmission electron microscopy analysis show an efficient transformation of the t-ZrO2 at the surface which exhibits the typical yellow-gold color of ZrN and high wear resistance. For a 2 h treatment at 750 degreesC the nitriding is accompanied by the formation of a 250 nm thick gradient layer of ZrN structure and a partial transformation of t-ZrO2 into cubic zirconia deeper in the bulk. (C) 2002 Elsevier Science B.V. All rights reserved.


Published in:
Thin Solid Films, 425, 1-2, 113-116
Year:
2003
ISSN:
0040-6090
ISBN:
0040-6090
Other identifiers:
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-01-28


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