Electrochemical Deposition of Hydroxyapatite Coatings on CoCrMo Alloy

摘要

Hydroxyapatite (HA) is widely applied as bone graft material due to its osteoconductive potential and well-established biocompatibility. The high osteoconductive potential of the HA coating provides a potential structure for use as bone substitute in orthopedic, oral, and cranio-maxillofacial reconstructive surgery, and as dento-alveolar implants. The aim of this work is to present hydroxyapatite coatings which were prepared on CoCrMo as-cast alloy by electrochemical deposition technology in the mixed solution Ca(NO_3)_2·4H_2O and NH_4H_2PO_4. CoCrMo alloy complies with the ISO 5832-4 standard and is widely used in the manufacturing of orthopedic implants because of its high strength, good corrosion resistance and excellent biocompatibility properties. HA coating is used to ensure sufficient bioactivity, but application of hydroxyapatite in orthopedic implants suffers from its low fracture toughness and poor wear resistance. Carbon nanotube (CNT), with its high stiffness and mechanical strength, is an attractive reinforcement for HA to surmount these issues.