Hydroxyapatite coating on C/C with graphene oxide interlayer

ABSTRACTHydroxyapatite (HA) coatings were synthesised on carbon/carbon composites (C/C) with a graphene oxide (GO) interlayer. The morphology and microstructure of the GO interlayer and the HA coating were researched. The effect of applying GO interlayer on the morphology and microstructure of HA coating was investigated. The in vitro bioactivity of HA coating for C/C with GO interlayer was investigated. The results indicated that the GO interlayer was spread on the surface of C/C substrate uniformly. The morphology of the HA coating on original C/C was uneven composed of HA grains with a length 10–50 μm and nanoplate structure HA grains. The morphology of the HA coating with GO interlayer was uniform composed of single nanoplate structure HA grains. The formation process of the HA coating on C/C with GO interlayer was discussed. In addition, the simulated body fluid immersion tests showed that the HA coating with GO interlayer exhibited good bioactivity.