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Laser surface powder alloying of titanium with niobium and molybdenum

Grant number: 11/19982-2
Support Opportunities:Regular Research Grants
Duration: February 01, 2012 - January 31, 2014
Field of knowledge:Engineering - Mechanical Engineering - Manufacturing Processes
Principal Investigator:João Batista Fogagnolo
Grantee:João Batista Fogagnolo
Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


Surface modifications have been used in titanium implants in order to increase the implant-bone interaction, such as the formation of surface roughness or porosity, or increase biocompatibility, wear and corrosion resistance by depositing special coatings. However, such modifications usually decrease the fatigue resistance. On the other hand, the specific surface modifications used to increase the fatigue resistance does not meet the typical requirements for biomaterials, such as good interaction with bone tissue, wear and corrosion resistance. The main objective of this research project is to develop a titanium surface modification that can increase the fatigue strength without affecting other implant requests. To achieve this aim, titanium and Ti-6Al-4V alloy parts will be modified by laser surface powder alloying, producing chemical composition gradients that stabilizes the titanium phase at the surface. We hope that the lower elastic tension developed at the surface due the lower Young modulus can delay the fatigue crack initiation, increasing the fatigue resistance. Niobium and molybdenum powder will be used, providing ²-phase-stabilizer elements to the alloy. The coating will be characterized to determine their microstructure, phases present, hardness and elastic modulus. The results of this project can make a significant contribution to the use of titanium in prostheses and, more broadly, with structural purposes. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FOGAGNOLO, JOAO B.; RODRIGUES, ADILSON V.; SALLICA-LEVA, EDWIN; LIMA, MILTON S. F.; CARAM, RUBENS. Surface stiffness gradient in Ti parts obtained by laser surface alloying with Cu and Nb. SURFACE & COATINGS TECHNOLOGY, v. 297, p. 34-42, . (11/19982-2)
DA COSTA, FERNANDO HENRIQUE; PINHAO, RODRIGO; DOS ANJOS, SERGIO; CARAM, RUBENS; FOGAGNOLO, JOAO BATISTA. Stiffness and hardness gradients obtained by laser surface melting of an aged beta-Ti alloy. Materials Letters, v. 260, . (11/19982-2)
FANTON, LEONARDO; DE LIMA, NELSON BATISTA; RAYON ENCINAS, EMILIO; AMIGO BORRAS, VICENTE; MOREIRA AFONSO, CONRADO RAMOS; FOGAGNOLO, JOAO BATISTA. Effects of laser surface melting on crystallographic texture, microstructure, elastic modulus and hardness of Ti-30Nb-4Sn alloy. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, v. 30, n. 2, p. 392-404, . (11/19982-2)
FANTON, LEONARDO; DE LIMA, NELSON BATISTA; FRANCA HAYAMA, ALEXANDRA DE OLIVEIRA; CARAM, RUBENS; FOGAGNOLO, JOAO BATISTA. Texture Development in Cold Deformed and Recrystallized Ti-30Nb-4Sn Alloy and Its Effects on Hardness and Young's Modulus. ADVANCED ENGINEERING MATERIALS, v. 19, n. 6, . (11/19982-2)
SALLICA-LEVA, E.; CARAM, R.; JARDINI, A. L.; FOGAGNOLO, J. B.. Ductility improvement due to martensite alpha ` decomposition in porous Ti-6Al-4V parts produced by selective laser melting for orthopedic implants. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 54, p. 149-158, . (11/19982-2)
AZEVEDO DE CARVALHO, LISIANE ROCHA; SALLICA-LEVA, EDWIN; RAYON ENCINAS, EMILIO; BATISTA FOGAGNOLO, JOAO. Less-rigid coating in Ti obtained by laser surface alloying with Nb. SURFACE & COATINGS TECHNOLOGY, v. 346, p. 19-28, . (11/19982-2)

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