Composite Ceramics Based on Garnet-type Oxide Y2.5Nd0.5Al5O12 and Silicon Carbide. Preparation. Properties

We have obtained powders of garnet-type complex oxide Y2.5Nd0.5Al5O12 – x vol.% SiC (x = 0, 10, 20) using wet chemistry techniques. The ceramics based on the studying compounds were sintered using Spark Plasma Sintering (SPS) (

Study of Phase Composition Homogeneity in Depth of Tungsten Carbide Ceramics Produced by Spark Plasma Sintering

Tungsten carbide (WC) ceramics obtained by spark plasma sintering were investigated by layer-by-layer X-ray diffraction analysis. It was found that the phase composition of WC ceramics varies with the distance from the sample surface.The study was supported by the Russian Foundation for Basic Research under Scientific Project №20-33-90214

Tungstate Based Ceramics Obtained By Spark Plasma Sintering Method – Possible Material for Consolidation of Radioactive Wastes’ Components

The Spark Plasma Sintering method was used to produce high-density ceramics from tungstates SrWO4 and NaNd(WO4)2 with scheelite structure. These compounds are proposed as possible matrices for the consolidation of radwaste components. Powder samples were obtained by coprecipitation method and studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). After sintering, the samples retained their phase identity (scheelite structure). The total duration of sintering was ∼ 13-15 min, the relative density was reached ∼ 92, 99%. Keywords: Tungstates, RW, Spark Plasma Sintering, high density, microstructur

X-RAY PHASE ANALYSIS OF HARD ALLOYSOBTAINED BY SPARK PLASMA SINTERING OF POWDER WC +10 %Co+1 %Cr3C2

Parameters of powder WC +10 % Co +1 %Cr3C2sintering modes that provide the increase of grain size in sintered ceramics and greater wetting of tungsten carbide grains with cobalt were determined.Определены параметры режимов спекания порошка состава WC+10 %Co+1 %Cr3C2, приводящие к увеличению размера зерна в спеченной керамике и достижению большего смачивания зерен карбида вольфрама кобальтом.Работа выполнена при финансовой поддержке гранта РФФИ № 19-03-00925

STUDY OF THE PHASE CONTENT HOMOGENEITY OF CERAMICS OBTAINED BY SPARK PLASMA SINTERING OF POWDERWC + 10 %Co

The phase content of ceramic samples WC + 10 % Co was studied. Samples were obtained in different sintering modes. The isothermal holding in the sintering process did not affect on the depth distribution of the main phases.Исследован фазовый состав керамических образцов, полученных в разных режимах спекания порошка WC+10 %Co. Проведение изотермической выдержки в процессе спекания не повлияло на распределение основных фаз по глубине образца.Работа выполнена при финансовой поддержке РНФ в рамках гранта № 18-73-10177

High-Temperature Deformation of Ceramics Based on Tungsten Carbide with Different Grain Sizes

The aim of this work is to study the high-temperature deformation behavior of sintered tungsten carbide ceramics with different grain sizes. It is shown that the creep activation energy in UFG tungsten carbide with a grain size of ~0.15 μm, sintered from plasma-chemical nanopowder, is ~31 kTm.Работа выполнена при поддержке гранта РФФИ №20-33-90214

Prospects of Using Social Networks to Form the Culture of High School Students

The article discusses the features of modern youth that determine their behavior in the Internet, presents the results of a survey of high school students about their usage of social networks and video hosting.В статье рассмотрены особенности современной молодежи, определяющие ее поведение в интернет-пространстве, приведены и проанализированы результаты опроса старшеклассников об использовании ими социальных сетей и видеохостингов

Thermal expansion of scheelite-like molybdate powders and ceramics

NaxSr1 – 2xNdxMoO4 (x = 0–0.5, Δx = 0.1) solid solutions with the scheelite structure have been synthesized for the first time and their crystallographic parameters have been determined as functions of composition and temperature. Their thermal expansion coefficients have been determined in the temperature range 25–1000°C: αa = (12.9–14.9) × 10–6 °C–1 and αc = (24.9–25.9) × 10–6 °C–1. Using spark plasma sintering at tmax ≈ 872–985°C and τ ≈ 650–750 s, we have prepared ceramics with relative densities in the range 97–99%.This work was supported by the Russian Science Foundation, project no. 16-13-10464: Promising Mineral-Like Ceramic Materials with Improved and Controlled Functional Characteristics: Development, Synthesis, and Characterization