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Rodrigues, Lc
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article
Effect of sintering pressure on microstructure and mechanical properties of hot-pressed Ti6Al4V-ZrO2 materials
Abstract
The development of new design approaches for biomedical applications using conventional and well accepted bio inert materials is an actual challenge. This study proposes a bilayered materials design approach obtained by hot pressing and is concerned with the influence of sintering pressure on the interface reaction between titanium alloy (Ti6AI4V) and zirconia (ZrO2), on density and mechanical properties of the Ti6AI4V-ZrO2. For this purpose, different sintering pressures were studied (P = 5, 20 and 100 MPa). Bilayered materials were produced by hot pressing process, at T = 1175 degrees C. Microstructural characterization showed that Ti6AI4V reacts with ZrO2 (for P >= 20 MPa) and that the interface reaction is strongly dependent on pressure. Additionally, an oxygen-deficient ZrO2 _ (x) black zirconia layer was obtained for specimens produced at P = 20 and 100 MPa as result of decreased O/Zr ratio due to Ti diffusion into ZrO2 side. Young's modulus and hardness properties were evaluated by nano indentation test. The results showed that these properties are influenced by sintering pressure, increasing with an increase on sintering pressure, with the highest improvement for specimens produced at higher pressure.