Abstract
In this research, Al2O3 and SiO2 were co-deposited on medical grade 316L stainless steel to synthesize mullite particles for protection and bio-activation of metallic substrates. The parameters affecting coating quality and mullite value such as temperature, voltage and time were taken into account to determine an optimal condition and synthesize a uniform and crack-free coating. Since metallic implants are highly corrosive in contact with biological fluids, a ceramic coating such as mullite is mandatory for their protection. Different analysis, for instance, X-Ray Diffractometer (XRD) was employed to study the structure of coating. Field Emission Scanning Electron Microscopy (FE-SEM) images were taken to see morphology of deposited particles. Surface topography of mullite was authenticated by Atomic Force Microscopy (AFM). The results confirmed existence of a crack free and uniform coating with a superior bonding between substrate and mullite. On the other hand, optimal suspension and coating parameters were found to be T=30°C, 60V and 4 min in which a uniform, dense and crack free coating was achieved. Also, maximum amount of mullite was gained at 1450°C for 2 h.
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