Development of a bioactive surface on a Co- Cr- Mo alloy during investment casting or heat treatment

摘要

Two different techniques were used to promote a bioactive surface on a cobalt base alloy: ⅰ) the cobalt alloy melt was cast into wollastonite-coated cavities of an investment mold, or ⅱ) wollasonite-encapsulated as-cast samples were heat treated at 1220°C for 1 h, this is the typical treatment performed to this alloy for improving its mechanical behavior. In vitro bioactivity was assessed by immersing samples in a simulated body fluid for 21 days. Potentially bioactive layers were obtained in both of the cases. A thicker apatite layer was formed on the samples obtained by investment casting. However, since the heat treatment needs to be performed, the heat treatment method is also a promising technique for promoting the bone-bonding ability of this Co alloy.