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The fabrication process of bioactive bearing grade PEEK was consisted of three steps. First, micropores were formed on the bearing grade PEEK plates by sulfuric acid treatment. Second, plates were exposed to O2 plasma by glow discharge. Finally, the plates were immediately immersed in SBF controlled at pH 8.4 at 25.0 °C and held at 70 °C for 24 hours. By this final treatment, Apatite Nuclei were precipitated inside of the pores. In order to investigate which step has the most influence on enriching bioactivity, four types of samples were obtained by changing the combinations of each process and evaluated the bioactivity by using SBF.
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Hiruta et al. (2017) studied this question.