Titanium and Titanium Alloy Castings for Biomedical Application

摘要

The aim of this study is to optimize the economic net-shape forming of titanium and titanium alloys for the biomedical application. The alpha-case formation reaction between titanium, and Al_2O_3, ZrO_2, CaO stabilized ZrO_2 and ZrSiO_4 mold were examined in a plasma arc melting furnace. Regardless of the thermodynamic approach, alpha-case formation reactions still remain to be eliminated with the complex chemical milling processes. The reason why the alpha-case generated cannot be explained by the conventional a-case formation mechanism. However, from the experimental results and thermodynamic consideration, it can be confirmed that the a-case is formed not only by interstitial oxygen atoms but also by substitutional metal atoms dissolved from mold materials. Based on the interstitial and substitutional alpha-case formation mechanism, a-case controlled net-shape forming of titanium and titanium alloys can be possible for the biomedical application.