title: Corrosion and tribocorrosion behavior of Ti-B4C composite intended for orthopaedic implants.
abstract: 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 24vol% B4C particle reinforced composites were processed by hot pressing. Corrosion behaviour was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization in 9g/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.
authors: CMEMS-UMinho - Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal; Universidade do Minho, Dept. Eng. Mecânica, Azurém, 4800-058 Guimarães, Portugal. Electronic address: ftoptan@dem.uminho.pt.
authors: F
authors: F
authors: Toptan
authors: CMEMS-UMinho - Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal.
authors: A
authors: A
authors: Rego
authors: CMEMS-UMinho - Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal.
authors: A C
authors: AC
authors: Alves
authors: CMEMS-UMinho - Center for MicroElectroMechanical Systems, Universidade do Minho, Azurém, 4800-058 Guimarães, Portugal; Universidade do Minho, Dept. Eng. Mecânica, Azurém, 4800-058 Guimarães, Portugal.
authors: A
authors: A
authors: Guedes
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D003343:Corrosion; D008422:Materials Testing; D009985:Orthopedics; D019736:Prostheses and Implants; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D014025:Titanium
keywords: Biomaterials; Boron carbide; Corrosion; Metal matrix composite; Titanium; Tribocorrosion