FEATURES OF THE FORMATION AND SURFACE MORPHOLOGY OF BIOCOATINGS SATURATED WITH NATURAL SILICON COMPOUNDS

Abstract

The paper examines the stages of the process of synthesis of bio-coatings, which were formed in the plasma of spark discharges by the PEO method. Findings of the electrophysical parameters of the synthesis process of coatings formed without diatomite and with its addition to the electrolyte showed that the introduction of diatomite into the electrolyte leads to stabilization of the synthesis process, and an increase in the concentration of electrolyte components leads to an increase in the voltage at which PEO occurs. Conducted experiments to establish open porosity made it possible to determine that the highest porosity indicator (0.75%) has a coating formed in an electrolyte without diatomite, but more water absorption is characteristic of coatings synthesized in an electrolyte of 20 g/l KOH + 20 g/l r.s. .+20 g/l Na₆P₆O₁₈+20 g/l Na₄P₂O₇ + 20 g/l diatomite. It was established that when hydroxyapatite is added to the electrolyte, coatings with a larger number of craters on the surface are formed, but they are smaller in size.