Abstract
In this work we produced wollastonite-containing glass-ceramic coatings on alumina substrates by airbrush spraying of glass-based aqueous suspensions followed by sintering. Investigations by scanning electron microscopy revealed that layer-wise slurry deposition is a suitable technique to manufacture homogeneous and continuous bioceramic coatings without flaws or cracks at the coating/substrate interface. Coating thickness can be designed by controlling the number of spraying cycles. The bonding strength of the coating (about 22MPa) was found adequate for biomedical applications. A mechanical model based on the innovative concepts of quantized fracture mechanics was developed to predict the bonding strength and estimate the fracture toughness of the coating on the basis of experimental data from tensile tests. The approach proposed in this work can contribute to optimize the design and manufacturing of bioceramic coatings with the aim of improving their mechanical properties and suitability for clinical applications.
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