Surface characterization of Ti-7.5Mo alloy modified by biomimetic method |
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Authors: | ALA Escada D Rodrigues Jr APR Alves Claro |
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Affiliation: | a Department of Materials, Faculty of Engineering Guaratinguetá, São Paulo State University-UNESP, Av. Dr. Ariberto Pereira da Cunha, 333, Pedregulho, CEP 12.516-410, Guaratinguetá, SP, Brazilb Department of Engineering Materials (DEMAR), School of Engineering Lorena, University of São Paulo EEL/USP, 12.601-810, Lorena, SP, Brazilc Associated Laboratory of Sensors and Materials, LAS, National Institute for Space Research, INPE, Av. dos Astronautas, 1758, Jd. Granja, CEP 12227-010, São José dos Campos, SP, Brazil |
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Abstract: | Titanium and its alloys have been used in dentistry due to their excellent corrosion resistance and biocompatibility. It was shown that even a pure titanium metal and its alloys spontaneously form a bone-like apatite layer on their surfaces within a living body. The purpose of this work was to evaluate the growth of calcium phosphates at the surface of the experimental alloy Ti-7.5Mo. We produced ingots from pure titanium and molybdenum using an arc-melting furnace. We then submitted these ingots to heat treatment at 1100 °C for one hour, cooled the samples in water, and cold-worked the cooled material by swaging and machining. We measured the media roughness (Ra) with a roughness meter (1.3 and 2.6 μm) and cut discs (13 mm in diameter and 4 mm in thickness) from each sample group. The samples were treated by biomimetic methods for 7 or 14 days to form an apatite coating on the surface. We then characterized the surfaces with an optical profilometer, a scanning electron microscope and contact angle measurements. The results of this study indicate that apatite can form on the surface of a Ti-7.5Mo alloy, and that a more complete apatite layer formed on the Ra = 2.6 μm material. This increased apatite formation resulted in a lower contact angle. |
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Keywords: | Titanium alloys Surface roughness Chemical treatment |
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