Study of dynamical properties in $\beta$-TCP/CH layers

Abstract

$\beta$-Tricalcium phosphate/Chitosan ($\beta$-TCP/Ch) coatings were deposited on 316L stainless steel (316L SS) substrates by a cathodic electro-deposition technique at different coating compositions. The crystal lattice arrangements were analyzed by X-Ray diffraction (XRD), and the results indicated that the crystallographic structure of $\beta$-TCP was affected by the inclusion of the chitosan content. The changes in the surface morphology as a function of increasing chitosan in the coatings via scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed the root-mean squares hardness of the $\beta$-TCP/Ch coatings decreased by further increasing chitosan percentage. The elastic-plastic characteristics of the coatings were determined by conducting nanoindentation test, indicating that the increase if chitosan percentage is directly related to increasing the hardness and elastic modulus of the $\beta$-TCP/Ch coatings. Tribological characterization was performed by scratch test and pin-on-disk test to analyze the changes in the surface wear the $\beta$-TCP/Ch coatings. Finally, the results indicated an improvement in the mechanical and tribological properties of the $\beta$-TCP/Ch coatings as a function of increasing of the chitosan percentage.