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

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Autor(es):
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]
Número total de Autores: 8
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Materials Science & Engineering C-Materials for Biological Applications; v. 107, FEB 2020.
Citações Web of Science: 0
Resumo

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)

Processo FAPESP: 16/09350-2 - Desenvolvimento de implantes customizados em biomateriais metálicos utilizando sinterização direta de metais por laser
Beneficiário:Rubens Maciel Filho
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
Processo FAPESP: 07/54829-5 - Estrutura eletrônica e geométrica de nano materiais: um estudo por radiação sincroton
Beneficiário:Richard Landers
Linha de fomento: Auxílio à Pesquisa - Temático