Publication detail
Fabrication and characterization of DLC coated microdimples on hip prosthesis heads
CHOUDHURY, D. CHING, H.A. MAMAT, A.B. ČÍŽEK, J. ABU OSMAN, N.A. VRBKA, M. HARTL, M. KŘUPKA, I.
Czech title
Aplikace mikrovtisků a DLC vrstev na hlavice kyčelních endoprotéz
English title
Fabrication and characterization of DLC coated microdimples on hip prosthesis heads
Type
journal article in Web of Science
Language
en
Original abstract
Diamond like carbon (DLC) is applied as a thin film onto substrates to obtain desired surface properties such as increased hardness and corrosion resistance, and decreased friction and wear rate. Microdimple is an advanced surface modification technique enhancing the tribological performance. In this study, DLC coated microdimples were fabricated on hip prosthesis heads and their mechanical, material and surface properties were characterized. An Electro discharge machining (EDM) oriented microdrilling was utilized to fabricate a defined microdimple array on stainless steel (SS) hip prosthesis heads. The dimpled surfaces were then coated by hydrogenated amorphous carbon (a-C:H) and tetrahedral amorphous carbon (Ta-C) layers by using a magnetron sputtering technology. A preliminary tribology test was conducted on these fabricated surfaces against a ceramic ball in simulated hip joint conditions. It was found that the fabricated dimples were perpendicular to the spherical surfaces and no cutting-tools wear debris was detected inside the individual dimples. The a-C:H and Ta-C coatings increased the hardness at both the dimple edges and the nondimpled region. The tribology test showed a significant reduction in friction coefficient for coated surfaces regardless of microdimple arrays: the lowest friction coefficient was found for the a-C:H samples, followed by Ta-C, as compared to the SS surface.
Czech abstract
Článek se zabývá aplikací mikro-vtisků a DLC vrstev na třecí povrchy hlavic kyčelních endoprotéz. Jsou sledovány mechanické, materiálové a tribologické vlastnosti navržených úprav třecích povrchů. Tribologické testy prokázaly, že DLC vrstva významně snižuje součinitel tření kloubního páru.
English abstract
Diamond like carbon (DLC) is applied as a thin film onto substrates to obtain desired surface properties such as increased hardness and corrosion resistance, and decreased friction and wear rate. Microdimple is an advanced surface modification technique enhancing the tribological performance. In this study, DLC coated microdimples were fabricated on hip prosthesis heads and their mechanical, material and surface properties were characterized. An Electro discharge machining (EDM) oriented microdrilling was utilized to fabricate a defined microdimple array on stainless steel (SS) hip prosthesis heads. The dimpled surfaces were then coated by hydrogenated amorphous carbon (a-C:H) and tetrahedral amorphous carbon (Ta-C) layers by using a magnetron sputtering technology. A preliminary tribology test was conducted on these fabricated surfaces against a ceramic ball in simulated hip joint conditions. It was found that the fabricated dimples were perpendicular to the spherical surfaces and no cutting-tools wear debris was detected inside the individual dimples. The a-C:H and Ta-C coatings increased the hardness at both the dimple edges and the nondimpled region. The tribology test showed a significant reduction in friction coefficient for coated surfaces regardless of microdimple arrays: the lowest friction coefficient was found for the a-C:H samples, followed by Ta-C, as compared to the SS surface.
Keywords in Czech
modifikace povrchů; mikro-vtisk; DLC vrstva; endoprotéza kyčelního kloubu
Keywords in English
surface modification; micro dimple; diamond like carbon; hip prosthesis; implant interface
RIV year
2014
Released
01.07.2015
Publisher
Wiley Periodicals, Inc.
Location
USA
ISSN
1552-4973
Volume
103
Number
5
Pages from–to
1002–1012
Pages count
11
BIBTEX
@article{BUT109778,
author="Dipankar {Choudhury} and Jan {Čížek} and Martin {Vrbka} and Martin {Hartl} and Ivan {Křupka},
title="Fabrication and characterization of DLC coated microdimples on hip prosthesis heads",
year="2015",
volume="103",
number="5",
month="July",
pages="1002--1012",
publisher="Wiley Periodicals, Inc.",
address="USA",
issn="1552-4973"
}