Effect of thin SiO2 layers deposited by means of atomic layer deposition method on the mechanical and physical properties of stainless steel

The aim of this study was to assess the suitability of the atomic layer deposition method in terms of using it for 316 LVM (low carbon vacuum melt) steel surface modification that is used for blood‐contacting implants in determined technological conditions. As part of a suitability assessment of thin layer deposition technology, the performance of mechanical and physical properties testing was proposed. The investigation influences the evaluation of the analysed material in the cardiovascular system's behavior used for blood. 316 LVM stainless steel was the initial material to be tested. The 316 LVM steel was subjected to the following surface modifications: electrolytic polishing, chemical passivation and deposition of a silicon dioxide (SiO2) layer using the atomic layer deposition method. The layer was applied at a variable thickness depending on the atomic layer deposition process, at constant temperature. In terms of mechanical properties, the analyzing adhesion of applied layers to the metallic base and its hardness were examined. What is more, during the evaluation of physical properties, testing of surface wettability was performed, which has a fundamental significance in case of implants used in the cardiovascular system. The obtained results have direct impact on optimization process of SiO2 layers deposition with atomic layer deposition method on blood‐contacting implants, which surface was made of steel 316 LVM, there by resulting in their have a direct impact functional properties improvement.