Effects of high temperature plasma immersion ion implantation on wear resistance of Ti-Si-B sintered alloys
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Data
2013-08-15
Autores
Fernandes, Bruno Bacci
Oliveira, Rogério Moraes
Ueda, Mário
Mariano, Samantha de Fátima Magalhães
Ramos, Alfeu Saraiva [UNESP]
Vieira, Maxson Souza
de Melo, Francisco Cristóvão Lourenço
de Oliveira, Guilherme
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Resumo
Although titanium and its alloys own good mechanical properties and excellent corrosion resistance, these materials present poor tribological properties for specific applications that require wear resistance. In order to produce wear-resistant surfaces, this work is aimed at achieving improvement of wear characteristics in Ti-Si-B alloys by means of high temperature nitrogen plasma immersion ion implantation (PIII). These alloys were produced by powder metallurgy using high energy ball milling and hot pressing. Scanning electron microscopy (SEM) and X-ray diffraction identified the presence of α-titanium, Ti6Si2B, Ti5Si3, TiB and Ti3Si phases. Wear tests were carried out with a ball-on-disk tribometer to evaluate the friction coefficient and wear rate in treated and untreated samples. The worn profiles were measured by visible light microscopy and examined by SEM in order to determine the wear rates and wear mechanisms. Ti-7.5Si-22.5B alloy presented the highest wear resistance amongst the untreated alloys produced in this work. High temperature PIII was effective to reduce the wear rate and friction coefficient of all the Ti-Si-B sintered alloys. © 2013 Elsevier B.V.
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Powder metallurgy, Titanium alloys, Tribological properties, Excellent corrosion resistances, Friction coefficients, High temperature plasma immersion, High-energy ball milling, Plasma immersion ion implantation, Visible light microscopy, Wear characteristics, Alloys, Ball milling, Cerium alloys, Corrosion resistance, Friction, Hot pressing, Ion implantation, Plasma applications, Scanning electron microscopy, Silicon, Sintering, Titanium, Titanium compounds, Tribology, Wear of materials, Wear resistance, X ray diffraction
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Surface and Coatings Technology, v. 228, p. 195-200.