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K. V. Smyrnova,A. D. Pogrebnjak,V. M. Beresnev,S. V. Litovchenko,S. O. Borba‑Pogrebnjak,A. S. Manokhin,S. A. Klimenko,B. Zhollybekov,A. I. Kupchishin,Ya. O. Kravchenko,O. V. Bondar 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Nanostructured multicomponent (TiAlSiY)N coatings were fabricated by the cathodic-arc physical vapor deposition (CAPVD). In this study, a bias potential applied to the substrate was − 200 and − 500 V, and changes in structure and propertiesof coatings were investigated. Samples had a single-phase state with a face-centered cubic (FCC) lattice. Small crystallitesof about 7.5 nm and texture with [110] axis were observed at − 500 V. However, lower bias potential resulted in the formationof crystallites of about 41.6 nm with [111] preferred orientation. Moreover, coatings were characterized by superhardstate and demonstrated low wear, high abrasion and crack resistance. The testing of the polycrystalline cubic boron nitride(PCBN) cutting inserts covered with (TiAlSiY)N revealed an increase in the tool life coeffi cient during cutting by 1.66times in comparison with the base tool material. Therefore, (TiAlSiY)N coating is a perspective material for application asa protective layer in cutting tools.
L. F. Sukhodub,L. B. Sukhodub,A. D. Pogrebnjak,Amanzhol Turlybekuly,A. Kistaubayeva,I. Savitskaya,D. Shokatayeva 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.5
The composite materials based on hydroxyapatite (HA), sodium alginate (Alg)–magnetite (Fe 3 O 4 ) were synthesized by the “wet chemistry method” under the infl uence of microwave irradiation and ultrasound. The biomagnetic samples were investigated by XRD, RFA, SEM, TEM and colorimetric assay methods. The cytotoxicity was assessed on fi broblasts cultures. It was found that the synthesis of Fe 3 O 4 particles in the presence of Alg macromolecules leads to magnetite nanoparticles’ average size decreasing (up to 8 nm). The presence of samples with applied magnetite content (1% of HA) in a nutrient medium did not infl uence on cells viability. It was shown that the hydrogels were more conducive to cells survival and provide a greater degree of cell proliferation in comparison with beads. It was concluded that Fe 3 O 4 -loaded hydroxyapatite–alginate composites are characterized by good adhesive ability of the fi broblast cells and its bioactivity.