A5022120711- Advanced materials and composites
- Advanced ceramic materials synthesis
- Powder Metallurgy Techniques and Materials
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Metal Alloys Wear and Properties
- Injection Molding Process and Properties
- Nuclear materials and radiation effects
- Microwave Dielectric Ceramics Synthesis
- Surface Treatment and Coatings
- Titanium Alloys Microstructure and Properties
- Luminescence Properties of Advanced Materials
- Microstructure and Mechanical Properties of Steels
- X-ray Diffraction in Crystallography
- Microstructure and mechanical properties
- Material Properties and Applications
- Glass properties and applications
- MXene and MAX Phase Materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Ferroelectric and Piezoelectric Materials
- Thermal and Kinetic Analysis
- Tunneling and Rock Mechanics
- Polymer Science and Applications
- High-Temperature Coating Behaviors
- Additive Manufacturing and 3D Printing Technologies
N. I. Lobachevsky State University of Nizhny Novgorod
2019-2024
Yaroslav-the-Wise Novgorod State University
2021-2024
Institute of Physics and Technology
2023
Institute of Physics and Technology
2021
Abstract A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-Gd 2 O 3 nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and Gd phases with nanometer crystallite size retains this structure after annealing at temperatures up 1200 °C. Near full dense high IR-transparent ceramics were fabricated by spark plasma sintering (SPS) 1140 °C 60 MPa. in-line transmittance 1 mm thick exceeded...
The ceramic samples fabricated by spark plasma sintering of powder mixtures based on silicon nitride (Si3N4) were investigated. made wet chemical methods from commercial α-Si3N4 (the particle size <5 μm) and Y2O3-Al2O3 additive (3% to 10% wt.). Sintering was carried out at the heating rate 50 °C/min load 70 MPa until shrinkage end. characterized scanning electron microscopy X-ray diffraction. during analyzed, activation energy calculated according Young-Cutler model. density,...
The research results of the microstructure and corrosion resistance Ti Ti-Al-V Russian industrial titanium alloys obtained by spark plasma sintering (SPS) are described. Investigations microstructure, phase composition, hardness, tensile strength, electrochemical hot salt alloy specimens were carried out. It was shown that have a uniform highly dense high hardness values. studied also to during tests in acidic aqueous solution causing intergranular as well corrosion. assumption differences...
Transparent ceramics based on ytterbium oxide have been successfully produced by vacuum sintering of self-propagating high-temperature synthesized powders with use a La2O3 aid. Phase composition and microstructure the initial were studied X-ray diffraction analysis scanning electron microscopy. It was found that addition 5 mol.% does not cause formation secondary phases in Yb2O3 powders. The 4% La:Yb2O3 showed best in-line transmittance 73% at wavelength 2 μm among samples. Dependence Verdet...
Novel IR-transparent ceramics of erbium-doped Lu2O3-MgO and Sc2O3-MgO composites have been successfully obtained using a combination glycine-nitrate self-propagating high-temperature synthesis vacuum hot-pressing methods. Composites densities greater than 99.5% those calculated by X-ray diffraction consist uniformly distributed submicron grains magnesium rare earth oxides. The transmittances 1.5 mm thick are as high 84.5% 78.9% at ~5 µm for Er:Lu2O3-MgO Er:Sc2O3-MgO, respectively. Both...
Abstract The results of the qualitative and quantitative X-ray powder diffraction analysis W–C system samples are presented. Powder were nanopowders α-WC/W2C obtained by plasma chemical synthesis. High-density fine-grained structure ceramics was formed using method electro pulse sintering (spark sintering) from initial α-WC. optimal experimental conditions for proceeding tungsten carbide based ceramic chosen according to preliminary experiments. Reference intensity ratio phase used in this study.
This paper reported the results of research into effect Equal Channel Angular Pressing (ECAP) temperature and 1-h annealing on mechanical properties, stress-relaxation resistance, corrosion resistance austenitic steel AISI 321L with strongly elongated thin δ-ferrite particles in its microstructure. The formation α′-martensite fragmentation austenite grains takes place during ECAP. Ultrafine-grained (UFG) steels demonstrate increased strength. However, we observed a reduced Hall–Petch...
This study investigates the impact of carbon on kinetics spark plasma sintering (SPS) nano- and submicron powders WC-10 wt.%Co. Carbon, in form graphite, was introduced into by mixing. The activation energy solid-phase determined for conditions isothermal continuous heating. It has been demonstrated that increasing content leads to a decrease fraction η-phase particles shift shrinkage curve towards lower heating temperatures. established graphite no significant effect SPS “mid-range”...
Strontium fluorarsenate Sr5(AsO4)3F optical ceramics were fabricated for the first time by vacuum hot pressing of chemically precipitated powders. The properties these compared with those well-known strontium fluorophosphate Sr5(PO4)3F. According to BET, X-ray diffraction, and scanning electron microscopy, Sr5(PO4)3F powders have an isomorphic single-phase structure similar particle sizes about 100–200 nm. transmittances 1.5 mm thick samples are as high 89.5% 85.8% in mid-IR Sr5(PO4)3F,...
The results of X-ray diffraction analysis qualitative and quantitative phase composition powder solid polycrysral samples the system a-WC/W 2 C are presented. Powder (nanopowder) were obtained by plasmochemical synthesis from tungsten oxide hydrocarbon. High-density fine-grained structure ceramics was formed electropulse plasma sintering (spark sintering) initial industrial a-WC powders (AlfaAesar). Experimental data on a Shimadzu XRD-7000 diffractometer (CuKa, λ = 1.54 Å). optimal modes...
Abstract Parameters of powder WC + 10% Co sintering modes that exclude the possibility η-phase (Co 3 W C) formation were determined. The phase composition was controlled by introducing colloidal graphite into original powder.
The research results conducted on binderless tungsten carbide (WC) ceramics obtained by Spark Plasma Sintering (SPS) of WC powders with different average particle sizes (0.095, 0.8, 3 μm) are presented. Nonuniform distribution crystalline phases and microstructure the was studied using layer-by-layer XRD analysis SEM. Surface layers WC-based characterized nonuniform W2C phase grain sizes, including appearance abnormally large grains. Thickness layer at least 50 μm. effect under study is...
Improvement of the physical and mechanical properties hard alloys based on WC – Co widely used in manufacturing structural tool products nowadays results from use novel technologies providing formation a homogeneous high-density structures. Slight deviations carbon content equilibrium state lead to brittle η-phases (in particular, Co3W3C) and, accordingly, deterioration product. We present studying homogeneity phase composition samples + 10% Co, obtained using advanced plasma-chemical...