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Corrosion behavior of Ti and Ti reinforced by addition of ceramic particles obtained by combination of Colloidal and Powder metallurgy techniques

  • : ROBERTO G NEVES1, EDUARDO TABARES1, BEGOÑA FERRARI2, JAVIER SANCHEZ-HERENCIA2, AMAYA GARCÍA-CASAS1, ANTONIA JIMENEZ-MORALES1
  • : 1UNIVERSITY CARLOS III OF MADRID, 2INSTITUTE OF CERAMICS AND GLASS
  • : PDF Download
  • : 2015

Abstract

The aim of this work was to study the corrosion behaviour of Ti reinforced with submicron- and nano-sized ceramic particles (Al2O3, t-ZrO2 and Y2O3) processed by a combination of colloidal and powder metallurgy techniques. The former technique permitted homogeneous distribution of ceramic particles on the surfaces of titanium particles through the production of concentrated and stable aqueous suspensions. Suspensions were spray-dried to obtain easy-to-press agglomerates for subsequent uniaxial pressing and sintering. The corrosion behaviour of the composites and elemental Ti was evaluated by Electrochemical Impedance Spectroscopy (EIS). Immersion tests were performed in an aggressive aqueous solution (3.5 wt.% NaCl) at 25 C for up to 30 days. Microstructural inspection was carried out before and after the EIS tests in order to evaluate the evidence of corrosion events. Notable improvement in corrosion resistance was observed for Ti reinforced with ceramic particles as compared to elemental Ti processed by conventional powder metallurgy.

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