Effect of the modification by titanium dioxide nanotubes with different structures on the fatigue response of Ti grade 2

Author(s)

Campanelli, Leonardo Contri ^[1] ; Pereira da Silva, Paulo Sergio Carvalho ^[1] ; Camarinho Oliveira, Nilson Tadeu ^[2] ; Bolfarini, Claudemiro ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Chem Sao Carlos, Ave Trabalhador Saocarlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 20, n. 2, p. 120-124, 2017.
• Web of Science Citations: 1

Abstract

Nanotechnology is seeing as having potential to raise benefits to several research and application areas. Recently materials with nanostructured surfaces of nanopores, nanotubes and nanowires have become an important investigation field, since their chemical and physical properties may be substantially different from those of the corresponding substrate. In face of the necessity of assuring that such modifications are not deleterious to the mechanical behavior, the purpose of this work was to evaluate the fatigue performance of CP-Ti grade 2 with the surface modified by the formation of nanotubes on their different crystalline structures. The nanotubes layers were produced by anodic oxidation using a potential of 20V during 1h and a solution of glycerol, H2O and NaF, and analyzed by scanning electron microscopy. In order to obtain the anatase and rutile structures, annealing treatments were respectively performed at 450 degrees C and 650 degrees C. The axial fatigue tests were conducted in physiological solution at 37 degrees C following the stepwise load increase approach. When compared to the material without surface modification (polished surface), the results showed that the anatase phase did not affect the fatigue response, maintaining the fracture stress in 500 MPa, whereas the rutile phase caused a decrease to 450 MPa. (AU)

• FAPESP's process: 16/12995-5 - Fatigue of a metastable beta titanium alloy for application as biomaterial
• Grantee: Leonardo Contri Campanelli
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/01652-9 - Development of nanostructured surfaces, by electrochemical techniques, on biomedical titanium alloys
• Grantee: Nilson Tadeu Camarinho de Oliveira
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 13/04423-3 - Fatigue behavior of beta titanium alloys
• Grantee: Leonardo Contri Campanelli
• Support Opportunities: Scholarships in Brazil - Doctorate