Entity

Time filter

Source Type

Saint Petersburg, Russia

Konakov V.G.,Saint Petersburg State University | Kurapova O.Yu.,Saint Petersburg State University | Arutyunyan A.R.,Saint Petersburg State University | Lomakin I.V.,Saint Petersburg State University | And 3 more authors.
Materials Physics and Mechanics | Year: 2016

Ni - 1 wt.% Y2O3-92ZrO2 (YSZ) composite is fabricated by powder metallurgy technique with subsequent annealing at 1250 °C. Both the presence of ceramic nanopowder inclusions in the composite and identity of the compositions specifying the final phase and the initial mixture are revealed by energy dispersive analysis. With scanning electron microscopy, the microstructure of the composite is examined, and its typical grain size is estimated. The mechanical tests of the composite are performed addressing both tension of flat specimens and compression of cylindrical specimens. The optimal techniques for the further cyclic tests of Ni - 1 wt.% YSZ are proposed according to the standardized tests (GOST 25.502-79). © 2016, Institute of Problems of Mechanical Engineering. Source


Konakov V.G.,Saint Petersburg State University | Kurapova O.Y.,Saint Petersburg State University | Novik N.N.,Saint Petersburg State University | Golubev S.N.,Glass and Ceramics Ltd.
Materials Physics and Mechanics | Year: 2015

The approach for "copper-graphene" composites electrochemical deposition using graphene suspensions stabilized by non-ionic surfactants (polyacrylic acid and pluronic F-127) was developed. The produced coatings were studied by SEM and XRD. As a result, graphene and surfactant contents were optimized to achieve high quality of the composite surface. It has been shown that the type of non-ionic surfactant highly affects composite microstructure and its crystallinity. © 2015 Institute of Problems of Mechanical Engineering. Source


Konakov V.G.,Saint Petersburg State University | Kurapova O.Yu.,Saint Petersburg State University | Novik N.N.,Saint Petersburg State University | Pivovarov M.M.,Glass and Ceramics Ltd. | Archakov I.Yu.,Saint Petersburg State University
Reviews on Advanced Materials Science | Year: 2015

An approach providing yttrium-stabilized zirconia coatings deposition on titanium is suggested. High-quality YSZ coatings with 5-6 μm thickness were studied using SEM and XRD, the mechanical properties (Brenell and Moos hardness) of covered samples were compared with pure titanium characteristics. The regimes of titanium wafer pretreatment were optimized. It was shown that both 8Y2O3-92ZrO2 and 9Y2O-10TiO2-92ZrO2 coatings increase the material hardness. © 2015 Advanced Study Center Co. Ltd. Source


Konakov V.G.,Saint Petersburg State University | Ovid'ko I.A.,Saint Petersburg State University | Solovyeva E.N.,Glass and Ceramics Ltd. | Kurapova O.Y.,Saint Petersburg State University | And 2 more authors.
Materials Physics and Mechanics | Year: 2015

The paper reports synthesis of bulk nanocomposites from nanosized nickel and yttrium-stabilized zirconia powders. Characteristics of the phase composition of the synthesized composites and their microstructure are experimentally revealed. Mechanical properties of the composites are experimentally measured and discussed as those depending on the nanoceramic phase content. With the experimental data, it is concluded that the mechanical strength of the nanocomposites remains high enough in a wide range of nanoceramic phase concentrations. © 2015 Institute of Problems of Mechanical Engineering. Source


Konakov V.G.,Saint Petersburg State University | Solovyeva E.N.,Glass and Ceramics Ltd. | Kurapova O.Y.,Saint Petersburg State University | Novik N.N.,Saint Petersburg State University | And 2 more authors.
Materials Physics and Mechanics | Year: 2015

The approach for "nickel-YSZ-nanoceramics" bulk nanocomposite synthesis was developed. Compositions with the nanoceramic phase content lying in the range up to 20 wt.% YSZ were manufactured; their structure and chemical composition were studied using XRD, SEM, and EDX techniques. Experimental study of the composite mechanical properties (compressive strength) as a function of sample composition demonstrated the existence of maximal composite strength at YSZ content of 3 wt.%. Further addition of nanoceramic phase resulted in the significant decrease in material strength. © 2015 Institute of Problems of Mechanical Engineering. Source

Discover hidden collaborations