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TitleCorrosion and tribocorrosion behaviour of Ti−B4C composite intended for orthopaedic implants
Author(s)Toptan, Fatih
Rego, Alberto
Alves, Alexandra Manuela Vieira Cruz Pinto
Guedes, A.
KeywordsBoron carbide
Metal matrixcomposite
Issue date2016
JournalJournal of the Mechanical Behavior of Biomedical Materials
CitationF. Toptan, A. Rego, A.C. Alves, A. Guedes, Journal of the Mechanical Behavior of Biomedical Materials 61 (2016) 152-163
Abstract(s)Poor wear resistance of titanium is a major concern since relative movements due to the cyclic loads in body environment cause wear between the bone and the implant material leading to detachment of the wear debris and release of metal ions due to the simultaneous action of corrosion and wear, defined as tribocorrosion. In order to increase the tribocorrosion resistance, Grade 2 Ti matrix 24 vol.% B4C particle reinforced composites were processed by hot pressing. Corrosion behaviour was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization in 9 g/L NaCl solution at body temperature. Tribocorrosion tests were performed under open circuit potential, as well as under potentiodynamic polarization using a reciprocating ball-on-plate tribometer. Results suggested that the addition of B4C particles provided lower tendency to corrosion and lower corrosion kinetics under sliding, along with significantly reduced wear loss, mainly due to the load carrying effect given by the reinforcement particles.
Appears in Collections:DEM - Artigos em revistas de circulação internacional com arbitragem científica
CIICS - Artigos em revistas de circulação internacional com arbitragem científica

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