Hydroxyapatite and Zinc Oxide Based Two-Layer Coating, Deposited on Ti6al4v Substrate

Abstract

At first two-layer HA-ZnO/Alg coating was obtained on the preanodized Ti6Al4V substrates by the thermal substrate deposition method (TSD). In frame of this work TSD method was at first applied for obtaining ZnO coating from aqueous alginate-containing solutions on a pre-deposited OH layer. XRD, SEM analyzes show that the biopolymer has a significant influence on the coatings formation, their morphology, texture, structure of ZnO nanoparticles. The average rate of HA deposition and ZnO deposition from alginate containing solution are 4 μm/min and 30 μm/min, respectively. In the presence of alginate boll-shaped ZnO microparticles are formed on the HA layer, consisting of needle-shaped crystals. Obtained coating is promising for medical implants, based on titanium and its alloys, because they potentially have both bioactivity and antibacterial activity.

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

“…Manganese carbides and oxidesulfides, which include molybdenum, are also observed. In addition, a significant effect of molybdenum on chemical heterogeneity was observed, which is manifested in the expansion of the ligation bands of phosphorus and manganese and in the reduction of the degree of uneven distribution of elements such as silicon and sulfur, which is in good agreement with the results of the works [1,7,12,13,14,29,30].…”

Wear Resistance Improvement of Linear Block-Polyurethanes Under Conditions of Liquid Friction

“…However, polyurethanes of the same structure but of different ability of the oligoglycolic component for crystallization can have almost twice different values of hardness, and, accordingly, values of elasticity and coefficient of friction, or have the same hardness but completely different morphology. Using many years of experience, the authors of this article recommend slowing down the processes of hydrolysis of polyurethanes in three ways, which have shown a particular efficiency of application in industry [27,28,29,30,31,32,33,34,35]: a directed change in the chemical structure, electromagnetic radiation of varying intensity, the creation of composite materials based on the principle of additional intermolecular crosslinking at the stage of manufacturing and hot processing [36].…”