Wyniki 1-5 spośród 5 dla zapytania: authorDesc:"kAROLINA jurczyk"

Preparation and properties of Ni-free austenitic stainless steel with nanostructure

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Ni-free austenitic stainless steel with nanostructure has been synthesized by the combination of mechanical alloying (MA), heat treatment and nitrogenation of elemental microcrystalline Fe, Cr, Mn and Mo powders. The process parameters, morphology, microhardness, EDX-analysis and potentiodynamic curves of obtained powders were determined. Phase transformation from ferritic to austenitic was c[...]

Properties of titanium - hydroxyapatite nanocomposites

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The combination of good biocompatibility of hydroxyapatite (HA, Ca10(PO4)6(OH)2) and excellent mechanical properties of titanium is a good candidate way to expand the biomedical applications. In the present work, new titanium-hydroxyapatite nanocomposites with different HA contents (3, 10, 20 vol%) were successfully prepared by the combination of mechanical alloying (MA) and powder metallurgi[...]

Preparation and corrosion properties of Ti-45S5 Bioglass nanocomposites with electrochemically modified surface

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Commercially pure titanium and titanium alloys have become predominant in dentistry [1]. The high degree of biocompatibility of Ti and its alloys is connected with the passive oxide film formed on the metallic surface, consisting mainly of amorphous titanium dioxide (TiO2) [2]. However, low hardness and poor tribological properties of these alloys may become critical factor when wear phenomena are involved. On the other hand, bioactive glasses are materials, which can adhere to bone and tissues through the formation of calcium phosphate (hydroxyapatite - HA) at the interface of the material. This layer is chemically and structurally equivalent to the mineral phase in bone and is responsible for interfacial bonding. Due to low fracture toughness, glass cannot serve as a bulk implant material. The connection of good mechanical properties of titanium with excellent biocompatibility of bioactive glasses seems to be a promising candidate way to expend the biomedical applications [3, 4]. Surface properties of titanium implants are known as key factors for successful osseointegration [5]. Till now, various surface modification methods have been applied to dental implants in attempts to improve their clinical performance [6, 7]. Surface treatment of the implant material can result in surface roughening, attractive for tissue growth and fixing of implant for hard tissue applications [8, 9]. The promising route in surface roughening is an electrochemical etching [10, 11]. The treatment in H3PO4 electrolytes results in pits formation, acting as anchors for the tissue. The etching procedure can be applied for pure Ti as well as its alloys. In the nanocomposites, due to the large volume of the grains boundaries, the electrochemical etching proceeds fast and is suitable for the sufficient surface roughening [12]. During the etching an anodic oxide layer is formed resulting in good corrosion resistance. The additional [...]

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