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Shcherbinka, Russia

Badaev F.Z.,Moscow State Industrial University | Tarasovskii V.P.,Moscow State Industrial University | Novoselov R.A.,Moscow State Industrial University | Khairi A.K.,Moscow State Industrial University | Reznichenko A.V.,ZAO NTTs Bakor
Refractories and Industrial Ceramics | Year: 2015

A chemical method with reaction of aluminum alloy D16 and aqueous sodium hydroxide solution is used to prepare very fine aluminum hydroxide powder. It is established by x-ray phase analysis that the powder obtained consists of three aluminum oxide modifications: gibbsite, boehmite, and bayerite. It is shown by laser diffraction that within an aluminum oxide suspension there is extensive bimodal distribution of particle size distribution (0.4 – 190 μm). The powder obtained is a precursor for preparing aluminum oxide ceramic. © 2015 Springer Science+Business Media New York Source

Tarasovskii V.P.,ZAO NTTs Bakor
Refractories and Industrial Ceramics | Year: 2015

Powders are obtained containing metal particles during chemical dispersion of Al–Mg (20 wt.%)-alloy. A method of high-temperature self-propagating synthesis is used in order to prepare cermet. Reaction sintering in a filtering combustion regime for a powder workpiece is implemented by heating in air at 550 – 600°C followed by initiation of metal exothermic reaction combustion. © 2015 Springer Science+Business Media New York Source

Trifonov Y.G.,Pure Research | Kuznetsova D.E.,Pure Research | Dosovitskii G.A.,Pure Research | Omarov A.Y.,Moscow State Industrial University | And 2 more authors.
Refractories and Industrial Ceramics | Year: 2015

Results are provided for a study of the mechanical and luminescence properties of aluminum-yttrium garnet ceramic specimens alloyed with cerium (Y2.97Ce0.03Al5O12). Specimens are prepared from nanostructured powder with a primary particle size of the order of 50 nm prepared by coprecipitation, compaction, and sintering. © 2015 Springer Science+Business Media New York Source

Vassiliev S.Y.,Moscow State University | Laurinavichute V.K.,Moscow State University | Abakumov A.M.,University of Antwerp | Govorov V.A.,Moscow State University | And 7 more authors.
Journal of the Electrochemical Society | Year: 2010

The performance of SnO2 ceramic anodes doped with copper and antimony oxides was examined in cryolite alumina melts under anodic polarization at different cryolite ratios, temperatures, times, and current densities. The corroded part consists of a narrow strong corrosion zone at the anode surface with damage of the intergrain contacts and a large increase in porosity, a wider moderate corrosion zone with a smaller porosity increase, and a Cu depletion zone, where the ceramic retains its initial microstructure and a slight porosity increase occurs due to the removal of the Cu-rich inclusions. Mechanical destruction of the anode was never observed in the 10-100 h tests. A microstructural model of the ceramic was suggested, consisting of grains with an Sb-doped SnO2 grain core surrounded by an ∼200 to 500 nm grain shell where SnO2 was simultaneously doped with Sb and Mn+ (M= Cu2+, Fe3+, Al3+). The grains were separated by a few nanometers thick Cu-enriched grain boundaries. Different secondary charge carrier (holes) concentrations and electric conductivities in the grain core and grain shell result in a higher current density at the intergrain regions that leads to their profound degradation, especially in the low temperature acidic melt. © 2010 The Electrochemical Society. Source

Shlyapin A.D.,Moscow State Industrial University | Omarov A.Y.,Moscow State Industrial University | Tarasovskii V.P.,ZAO NTTs Bakor | Trifonov Y.G.,Moscow State Industrial University
Refractories and Industrial Ceramics | Year: 2013

Results are given for petrographic analysis of aluminum oxide powder, prepared by chemical dispersion of aluminum-magnesium alloys, containing 6 and 12 wt.% magnesium. Powders are washed by vacuum filtration and dried at 60 - 80 C. Heat treatment is performed at 1400 C with soaking for 1 h. Comparative analysis of the results obtained is also performed, and material phase composition and structure are described. © 2013 Springer Science+Business Media New York. Source

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