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Nano-crystallization and surface analysis of electrolytic ZrO2 coatings on Co-Cr alloy.

Authors
  • Yen, S K
  • Hsu, H C
Type
Published Article
Journal
Journal of materials science. Materials in medicine
Publication Date
Jun 01, 2001
Volume
12
Issue
6
Pages
497–501
Identifiers
PMID: 15348264
Source
Medline
License
Unknown

Abstract

Zirconia coatings were formed on Co-Cr substrates by electrolytic deposition. The microstructure of electrolytic zirconia-coated films on Co-Cr substrates was examined. According to the results of ESCA, the bonding energies of ZrO2 coating surface layer which changed with the annealing temperature from 400 degrees C, 500 degrees C to 600 degrees C are attributed to amorphous (a), tetragonal (t) and monoclinic (m) structure, respectively. The X-ray diffraction (XRD) of the coatings on the Co-Cr substrates annealed at 400, 500 and 600 degrees C revealed the major crystallization from m through t and then to m+t. However, TEM observations clearly showed that the interface layer of the coatings were nanosize crystallites, first the formation of tetragonal and monoclinic ZrO2 structures. These different phase transformations are mainly due to the different surface energy of ZrO2 coating in air, in bulk or on Co-Cr alloy.

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