Abstract
In this work, calcium phosphate (CaP) coating was electrodeposited on the three dimensional surface of SLM-Ti scaffolds. The in situ measurement showed that the potential variation within 5 mm thickness porous selective laser melting (SLM)-Ti samples was about 80 mV as a result of the low conductivity of CaP coatings. SEM observation results revealed that the coating morphology depended on the distance between the surface position of porous SLM-Ti electrode and the auxiliary electrode. Based on the compared electrochemical experiments, it was found that the top and the bottom surfaces of SLM-Ti scaffolds exhibited continuous nucleation and instantaneous nucleation behavior respectively. The Electrochemical impedance spectroscopy (EIS) results also revealed that the electrodeposition processes at different depth of SLM-Ti scaffolds were not synchronized. These differences were ultimately caused by the non-uniform distribution of the potential and the current inside porous SLM-Ti electrodes. The present work provides a basic research method for studying the mechanism of the electrochemical process on three dimensional surfaces of SLM-Ti scaffolds.
Highlights
Bone fusion has been one of the most important issues in bone engineering
The variation porous Selective laser melting (SLM)-Ti during the deposition is shown in related topotential the conductivity ofwithin the electrolyte and the samples coating according toCaP
The nucleation and growth behaviors of the electrodeposition of Calcium phosphate (CaP) coating on 3D surfaces
Summary
Bone fusion has been one of the most important issues in bone engineering. Porous titanium possessing interconnecting pores and high porosity enables the host bone to grow into the scaffolds, suggesting a direct bone fusion between the host bone and artificial bone can be achieved [1,2].Selective laser melting (SLM) based on the principle of incremental manufacturing of materials is compatible with titanium and can directly control configurations with dimensional accuracy up to several hundred micros [3,4,5]. Porous titanium possessing interconnecting pores and high porosity enables the host bone to grow into the scaffolds, suggesting a direct bone fusion between the host bone and artificial bone can be achieved [1,2]. Numerous attempts have been made to manufacture novel biomorphic titanium alloy and Ti-based matrix composites by SLM [6,7]. The innovative potential and application prospect of SLM-Ti scaffolds in orthopedic surgery are widely expected. To further promote bone fusion, it is critical to develop biomimetic coatings with specific surface characteristics on titanium-based biomaterials. The biomechanical strength of CaP ceramic is too poor to be used as a load-bearing artificial bone
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