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Konakov V.G.,Saint Petersburg State University | Solovyeva E.N.,Russian Academy of Sciences | Archakov I.Yu.,Saint Petersburg State University | Golubev S.N.,Scientific and Technical Center Glass and Ceramics
Materials Physics and Mechanics | Year: 2013

This paper reports the development of a sturdy reactive-linked ceramics based on Al2O3(Al)-SiC-BN-Si3N4 system. Ceramic samples of different initial compositions and varied manufacturing procedure were studied by XRD; mechanical strength of these samples is discussed. It is stated that such products of chemical interactions occurring during ceramics production, as Si and AlN positively affects ceramics strength. The effect of aluminum, aluminum borates, and silicon nitride content on the strength of final ceramics is discussed. © 2013, Institute of Problems of Mechanical Engineering. Source


Konakov V.G.,Saint Petersburg State University | Solovyeva E.N.,Russian Academy of Sciences | Archakov I.Yu.,Russian Academy of Sciences | Golubev S.N.,Scientific and Technical Center Glass and Ceramics
Reviews on Advanced Materials Science | Year: 2013

Thermal analysis of ternary Al-BN-SiC batch aimed for the production of nanomodified functional Al2O3-BN-SiC ceramics and the analysis of binary systems and individual compounds forming the above system were performed. It was shown that powders dispersion and samples pretreatment (pressing, heating in air, and vacuum annealing) affect thermal behavior of the samples. The nature of endothermic and exothermic effects as well as peculiarities of weight changes during heating-cooling cycles are discussed. The information for ternary system samples is compared with the data obtained for samples modified by nano-sized zirconia powder. As a result of the study, the conclusion on the suitability of the chosen composition for themanufacturing of nanomodified functional ceramics is stated. © 2013 Advanced Study Center Co. Ltd. Source


Konakov V.G.,Saint Petersburg State Polytechnic University | Kurapova O.Yu.,Saint Petersburg State Polytechnic University | Novik N.N.,Saint Petersburg State Polytechnic University | Golubev S.N.,Scientific and Technical Center Glass and Ceramics | And 5 more authors.
Reviews on Advanced Materials Science | Year: 2014

Optimized approach for nanotwinned copper synthesis via electrodeposition technique is described. SEM, EBSD, XRD, and Nanoindentation tests of the synthesized layers were performed. The results of the tests demonstrate good surface quality and improved hardness. © 2014 Advanced Study Center Co. Ltd. Source


Konakov V.G.,Saint Petersburg State University | Golubev S.N.,Scientific and Technical Center Glass and Ceramics | Solovyeva E.N.,Institute of Problems of Mechanical Engineering | Archakov I.Yu.,Institute of Problems of Mechanical Engineering | And 2 more authors.
Materials Physics and Mechanics | Year: 2011

Precursor powders with the final 9C22O3-91ZrO 2 (mol.%) composition were synthesized using the reverse precipitation sol-gel method varying the concentrations of the solutions of the initial salt reagents. A set of physical and chemical investigation approaches shows that the mechanical strength of Ce-Zr ceramics depends both on precursor dispersity and on CeO2 content. © 2011, Institute of Problems of Mechanical Engineering. Source


Konakov V.G.,Saint Petersburg State University | Golubev S.N.,Scientific and Technical Center Glass and Ceramics | Solovyeva E.N.,Institute of Problems of Mechanical Engineering | Archakov I.Y.,Institute of Problems of Mechanical Engineering | And 2 more authors.
Materials Physics and Mechanics | Year: 2012

Precursor powders with controlled average agglomerate size in the range of 40-12000 nm were synthesized using the reverse precipitation sol-gel. The correlation between the agglomerate size and mechanical strength of the final ceramics synthesized from these precursor powders and the content of Ce 3+ and Ce 4+ in the precursors was studied using BET, XRD, TEM, PSD, and DSC methods. © 2012, Institute of Problems of Mechanical Engineering. Source

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