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Title: Shot Peening of a Titanium Alloy for Medical Implant Applications with Zirconia Shot
Author: Schuh Holzwarth Zeiler Kachler Göske Knetsch Eigen
Source: Conf Proc: ICSP-9 (pg 54-59)
Publication year 2005
Document number: 2005051
Number of pages: 6
Abstract:
Authors: A. Schuh, U. Holzwarth, G. Zeiler, W. Kachler, J. Göske, T. Knetsch, B. Eigenmann
ABSTRACT
Shot peening with steel shot followed by a cleaning process with glass beads is commonly used as surface finish in the production of modular hip endoprostheses. The induced
compressive residual stresses increase the resistance against fatigue and fretting fatigue. The surface roughness can be adjusted in a range that enhances the physiological
acceptance / compatibility of monolithic implants. However, an increasing number of publications show that there is a significant contamination of residual glass fragments
at the finished surfaces. Latest research suggested an association between glass particle contamination and increased corrosion or fretting fatigue, respectively of the
morse taper junction. The particles cause damage of the natural passivation layer of the Ti-alloy since the Ti-oxides show relatively poor mechanical properties. There are
also hints that particle contamination causes local osteolysis of the surrounding femur. The aim of this study was to evaluate the effects of shot peening with zirconia shot
in comparison with glass and/or steel shot. Zirconia beads offer higher hardness and strength/fracture resistance than glass beads. The surfaces of TiAI6V4 rods were shot
peened with zirconia shot using different Almen intensities and coverages. A field emission scanning electron microscope was used for the detection of the residual particle
contamination on the surfaces. The near-surface residual stress distributions induced by the shot peening processes were measured by X-ray diffraction. The results of the
scanning electron microscopy and X-ray residual stress analyses are discussed with respect to application of the shot peening processes as finish of monolithic and modular
hip endoprostheses.
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