Formation of calcium phosphate coating on carbon fibre with pyrolytic carbon interlayer

ABSTRACT

Pyrolytic carbon interlayer modified carbon fibers (PCF) were fabricated by chemical vapour deposition method. The original carbon fibers (OCF) and carbon fibers treated by H₂O₂ (HCF) were used as control samples. The CaP coatings were applied on OCF, HCF and PCF using pulse electrochemical deposition (PED) method. The morphology, microstructure and element composition of the CaP coatings for OCF, HCF and PCF were analyzed. The results showed that PCF exhibited smooth surface, whereas OCF and HCF had a grooved surface. More CaP crystals were formed on PCF than those on OCF and HCF using same deposition parameters. The introduction of pyrolytic carbon interlayer resulted in that the CaP coatings on carbon fibers transformed from octacalcium phosphate (OCP) to hydroxyapatite (HA). Simulated body fluid (SBF) immersion behavior of the CaP coating for PCF showed that the CaP coating could induce the formation of new apatite layer and exhibited good in-vitro bioactivity.

KEYWORDS:

• Bioceramics
• surfaces
• pulse electrochemical deposition

Acknowledgments

We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for X-ray photoelectron spectrometer characterization.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant Number 51872232], the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [Grant Number 136-QP-2015] and ‘111’ project of China (Grant Number B08040).