Abstract
This study attempts to simultaneously machine and synthesize a biomimetic nanoporous hydroxyapatite coating on the Zr67Cu11Ni10Ti9Be3 bulk metallic glass (BMG) surface. The aim is to investigate and optimize the hydroxyapatite deposition rate and the surface roughness during the electro-discharge coating of Zr67Cu11Ni10Ti9Be3 BMG. Scanning Electron Microscopy (SEM), X-ray powder Diffraction (XRD) and Energy-dispersive X-ray Spectroscopy (EDS) were employed to characterize and analyze the results. Response Surface Methodology using D-optimum custom design approach was utilized to generate the models and optimize the input parameters. A globule nanostructured and nanoporous coating of about 25.2 µm thick, containing mainly Ca, O, and K were ascertained. Further XRD analysis confirmed the deposition of biocompatible oxides (HA, CaZrO3, and ZrO2) and hard ZrC coating on the Zr67Cu11Ni10Ti9Be3 BMG surface. A significant improvement in cell viability was observed in the HA electro-discharge coated BMG specimens. The numerical models for the Hydroxyapatite Deposition Rate (HDR) and Surface Roughness (SR) were developed and experimentally validated using the optimized parameters setting suggested by the software. The achieved average predicted error of 4.94 and 5.09% for the HDR and SR respectively confirmed the excellent reproducibility of the developed models.
Highlights
The liquid-like, non-crystalline alloy called Bulk Metallic Glass (BMG) is produced by rapid quenching of liquid melts
Coating ofCoating about 25.2-μm thick was deposited on the Zr67 Cu11 Ni10 Ti9 Be3 bulk metallic glass (BMG) surface
electro-discharge machining (EDM) machine has a wide range of parameters which might be influential to the responses Hydroxyapatite Deposition Rate (HDR)
Summary
The liquid-like, non-crystalline (amorphous) alloy called Bulk Metallic Glass (BMG) is produced by rapid quenching of liquid melts. Processes 2020, 8, 635 high strength, high hardness, and excellent corrosion and wear resistance. This endows them with a wide range of applications. Inoue and Nishiyama [1] presented the applications of BMG as a structural, micro-sensing, and chemical materials. Various forms of BMG were currently developed, an in-vivo study conducted by Wei, et al [2] revealed the suitability of. Zr67 Cu11 Ni10 Ti9 Be3 BMG in producing orthopedic implants, due to its superior biocompatibility and efficient bonding to the surrounding tissues after implantation.
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