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Mechanical Properties of Nanostructured Hard Coating of ZrO2

Published online by Cambridge University Press:  31 January 2011

Renat F. Sabirianov ,
Fereydoon Namavar ,
Xiao Cheng Zeng ,
Jaeil Bai  and
Wai-Ning Mei
Renat F. Sabirianov
Affiliation:
rsabirianov@mail.unomaha.edu, University of Nebraska Omaha, Physics, Omaha, Nebraska, United States
Fereydoon Namavar
Affiliation:
fnamavar@unmc.edu, University of Nebraska Medical Center, Orthopaedic Surgery and Rehabilitation, Omaha, Nebraska, United States
Xiao Cheng Zeng
Affiliation:
xczeng@phase2.unl.edu, University of Nebraska, Chemistry, Lincoln, Nebraska, United States
Jaeil Bai
Affiliation:
jibai@phase1a.unl.edu, University of Nebraska, Chemistry, Lincoln, Nebraska, United States
Wai-Ning Mei
Affiliation:
physmei@mail.unomaha.edu, University of Nebraska Omaha, Physics, Omaha, Nebraska, United States
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Abstract

Nano-crystalline films of pure cubic ZrO2 have been produced by ion beam assisted deposition (IBAD) processes which combine physical vapor deposition with the concurrent ion beam bombardment in a high vacuum environment and exhibit superior properties and strong adhesion to the substrate. Oxygen and argon gases are used as source materials to generate energetic ions to produce these coatings with differential nanoscale (7 to 70 nm grain size) characteristics that affect the wettability, roughness, mechanical and optical properties of the coating. The nanostructurally stabilized chemically pure cubic phase has been shown to possess hardness as high as 16 GPa and a bulk modulus of 235 GPa. We examine the mechanical properties and the phase stability in zirconia nanoparticles using first principle electronic structure method. The elastic constants of the bulk systems were calculated for monoclinic, tetragonal and cubic phases. We find that calculated bulk modulus of cubic phase (237GPa) agrees well with the measured values, while that of monoclinic (189GPa) or tetragonal (155GPa) are considerably lower. We observe considerable relaxation of lattice in the monoclinic phase near the surface. This effect combined with surface tension and possibly vacancies in nanostructures are sources of stability of cubic zirconia at nanoscale.

Keywords

elastic propertieshardnesscoating
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-FF05-11
Copyright
Copyright © Materials Research Society 2010

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