Publication: Estudio de tratamiento superficial sobre sustratos de TI-6AL-4V pulvimetalúrgicos y laminados y evaluación de su resistencia a la oxidación
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2014
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2014-04-25
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Abstract
La aleación Ti6Al4V se utiliza en diversas aplicaciones debido a su buena combinación de propiedades. Sin embargo, en aplicaciones de alta temperatura sufre una importante oxidación en contacto con el oxigeno que limita la temperatura y el tiempo de su vida en servicio. Se realizó un tratamiento termoquímico sobre sustratos de Ti-6Al-4V con una sal halogenada (KBF4) con concentración del 3% en peso a las temperaturas de 2000, 9500, y 10500C, seguido de un tratamiento de oxidación de 300 horas a 6000C. Posteriormente las muestras tratadas se han analizado con rayos X, y mediante análisis microestructural de secciones transversales, utilizando un MEB (microscopio electrónico de barrido). A la vista de los resultados obtenidos, el tratamiento con KBF4 no resulta beneficioso a las temperaturas de 1050ºC y 950ºC puesto que aparece oxido de titanio en la superficie de las muestras. Sin embargo, a la temperatura de 200ºC aparece una capa de Al2O3 que protege a las muestras de una mayor oxidación. El propósito del presente estudio es analizar la efectividad de un tratamiento de halogenación con flúor sobre muestras de Ti6Al4V producidas por pulvimetalúrgia y laminadas para aminorar el efecto de la oxidación. Este proyecto se ha realizado en el laboratorio Dpto. Ciencia e Ingeniería de Materiales e Ingeniería Química de la Universidad Carlos III de Madrid.
Ti6Al4V alloy is used in several applications due to their good combination of properties. However, at high temperature applications this alloy oxidation suffers an important oxidation in contact with oxygen which limits the operating temperature and time in service conditions. A thermochemical treatment was carried out on Ti-6Al-4V substrates with a mixture of halogenated salt (KBF4) at a concentration of 3% wt at temperatures of 200ºC, 950ºC, and 1050ºC, followed by an oxidation treatment of 300 hours at 600ºC. Subsequently treated samples were analyzed with X-ray and by microstructural analysis of cross-sections using a SEM (scanning electron microscope). In view of the results obtained, KBF4 treatment does not seem to be beneficial at 1050ºC and 950ºC temperatures since titanium oxide appears in the surface of the samples. However, a layer of Al2O3 appears at 200ºC temperature and protects samples of greater oxidation. The purpose of this study is to analyze the effectiveness of a treatment halogenation with fluorine in powder metallurgy a wrought samples of Ti6Al4V to minimize the effect of oxidation. This project was carried out in the laboratory of the Department of Science and Materials Engineering and Chemical Engineering in University Carlos III of Madrid.
Ti6Al4V alloy is used in several applications due to their good combination of properties. However, at high temperature applications this alloy oxidation suffers an important oxidation in contact with oxygen which limits the operating temperature and time in service conditions. A thermochemical treatment was carried out on Ti-6Al-4V substrates with a mixture of halogenated salt (KBF4) at a concentration of 3% wt at temperatures of 200ºC, 950ºC, and 1050ºC, followed by an oxidation treatment of 300 hours at 600ºC. Subsequently treated samples were analyzed with X-ray and by microstructural analysis of cross-sections using a SEM (scanning electron microscope). In view of the results obtained, KBF4 treatment does not seem to be beneficial at 1050ºC and 950ºC temperatures since titanium oxide appears in the surface of the samples. However, a layer of Al2O3 appears at 200ºC temperature and protects samples of greater oxidation. The purpose of this study is to analyze the effectiveness of a treatment halogenation with fluorine in powder metallurgy a wrought samples of Ti6Al4V to minimize the effect of oxidation. This project was carried out in the laboratory of the Department of Science and Materials Engineering and Chemical Engineering in University Carlos III of Madrid.
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Industria metalúrgica, Materiales de recubrimiento, Aleación Ti6Al4V, Halogenación con flúor, Pulvimetalúrgia