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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sintering technique for implant applications

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Author(s):
Girao, Daniel de Castro [1] ; Beres, Miloslav [2, 1] ; Jardini, Andre Luiz [2] ; Maciel Filho, Rubens [2] ; Silva, Cleiton Carvalho [1] ; de Siervo, Abner [3] ; Gomes de Abreu, Hamilton Ferreira [1] ; Araujo, Walney Silva [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Ceara, Dept Met & Mat Engn, BR-60440900 Fortaleza, CE - Brazil
[2] Univ Estadual Campinas, Fac Chem Engn, BIOFABRIS Natl Inst Sci & Technol Biomfg, BR-13081970 Campinas, SP - Brazil
[3] Univ Estadual Campinas, Inst Phys Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Materials Science & Engineering C-Materials for Biological Applications; v. 107, FEB 2020.
Web of Science Citations: 0
Abstract

CoCrMo alloys have been used for several decades in implantable devices due to their favourable mechanical properties, low wear rate in addition to good biocompatibility and high corrosion resistance. These alloys are conventionally produced via casting and/or forging route, however additive manufacturing techniques being recently employed in their fabrication. In this work, CoCrMo samples were produced by direct metal laser sintering additive manufacturing process. The microstructure and surface composition were examined employing scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy (XPS). The corrosion resistance was measured in 0.14 M sodium chloride solution and in phosphate buffered solution (PBS) both with and without addition of albumin at pH 7.4 and 37 degrees C. For this, potentiodynamic tests in addition to electrochemical impedance spectroscopy were employed. The studied CoCrMo alloy exhibits a good corrosion resistance in solutions tested being the highest in PBS solution without albumin addition. The XPS analysis showed that the passive film composition and its thickness are not modified by the adsorbed layer. Microstructural analysis revealed occurrence of strain-induced martensitic transformation. (AU)

FAPESP's process: 16/09350-2 - Development of customized metallic implants using direct metal laser sintering
Grantee:Rubens Maciel Filho
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 07/54829-5 - Electronic and geometric structure of nano-materials: synchrotron radiation studies
Grantee:Richard Landers
Support type: Research Projects - Thematic Grants