DYNAMIC COMPRESSIBILITY OF HIGH-POROSITY DAMPERS OF THERMAL AND SHOCK LOADINGS: MODELING AND EXPERIMENT

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1183-1188 ◽  
Author(s):  
ANATOLY BRAGOV ◽  
ALEXANDER KONSTANTINOV ◽  
ANDREY LOMUNOV ◽  
ANATOLY SADYRIN ◽  
IVAN SERGEICHEV ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Porous Ceramic ◽  
Experimental Studies ◽  
Ceramic Materials ◽  
Heat Of Fusion ◽  
High Porosity ◽  
Dynamic Compressibility ◽  
Damping Materials ◽  
The Mathematical Model ◽  
Highly Porous

High-porosity materials, such as chamotte and mullite, possess a heat of fusion. Owing to their properties, these materials can be used with success as damping materials in containers for airplane, automobile, etc. transportation of radioactive or highly toxic materials. Experimental studies of the dynamic properties have been executed with using some original modifications of the Kolsky method. These modified experiments have allowed studying the dynamic compressibility of high-porosity chamotte at deformations up to 80% and amplitudes up to 50 MPa. The equations of the mathematical model describing shock compacting of chamotte as a highly porous, fragile, collapsing material are presented. Deformation of high-porous materials at non-stationary loadings is usually accompanied by fragile destruction of interpore partitions as observed in other porous ceramic materials. Comparison of numerical and experimental results has shown their good conformity.

Perspective Biomass Carrier for Anaerobic Processing Systems of Organic Waste AIC

2020 ◽  
Vol 67 (1) ◽  
pp. 148-155
Author(s):  
Anatoliy V. Fedotov ◽  
Viktor S. Grigoriev ◽  
Dmitriy A. Kovalev ◽  
Andrey A. Kovalev
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Specific Surface ◽  
Organic Waste ◽  
Porous Ceramic ◽  
Experimental Studies ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Developed Surface ◽  
Highly Porous

To speed up the wastewater treatment under aerobic conditions and to optimize the processes of anaerobic wastewater treatment in digesters, immobilization technologies of microorganisms and enzymes on solid carriers are used. Ceramic carriers based on aluminosilicates and alumina are one of the promising inorganic biomass carriers. (Research purpose) To study the structure of porous ceramic biomass carriers for anaerobic processing of organic waste and evaluate the prospects for their use. (Materials and methods) The substrate for anaerobic digestion was a mixture of sediments of the primary and secondary sewage sumps of the Lyubertsy treatment facilities. K-65 cattle feed was used to ensure the constancy of the composition of organic substances in substrates as a cosubstrate. The authors used the method of low-temperature nitrogen adsorption of Bruner-Emmett-Teller to study the pore structure and specific surface of solid carriers on a specific surface analyzer Quntachrome Autosorb-1. (Results and discussion) The main characteristics (specific surface, volume of micro- and mesopores, predominant pore radius, water absorption and others) of chamotte foam lightweight and highly porous corundum ceramics were determined. It was revealed that ceramic materials with a developed surface and electrically conductive material provided an increase in biogas yield by 3.8-3.9 percent with an increase in methane content by an average of 5 percent. (Conclusions) The results of anaerobic digestion showed a positive effect of both a conductive carrier and highly porous ceramic materials on the process of anaerobic bioconversion of organic waste into biogas. It is advisable to expand experimental studies on the use of a conductive carrier with a developed surface based on highly porous ceramics.

New heterogeneous catalytic systems based on highly porous ceramic materials modified with immobilized d-metal cage complexes for H2 production from CH4

2019 ◽  
Vol 29 (6) ◽  
pp. 669-671 ◽  
Author(s):  
Alexey G. Dedov ◽  
Yan Z. Voloshin ◽  
Alexander S. Belov ◽  
Alexey S. Loktev ◽  
Alexander S. Bespalov ◽  
...  
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
H2 Production ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Highly Porous ◽  
Porous Ceramic Materials

Magnetic Resonance Imaging of Water Absorption by Highly Porous Ceramic Materials

2019 ◽  
Vol 484 (2) ◽  
pp. 44-47
Author(s):  
E. V. Morozov ◽  
V. M. Buznik ◽  
A. S. Bespalov ◽  
D. V. Grashchenkov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Water Absorption ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Resonance Imaging ◽  
Highly Porous ◽  
Porous Ceramic Materials

scholarly journals A Novel Method for Changing the Dynamics of Slender Elements Using Sponge Particles Structures

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4874
Author(s):  
Mateusz Żurawski ◽  
Bogumił Chiliński ◽  
Robert Zalewski
Keyword(s):  
Mathematical Model ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Continuous Model ◽  
Particle Structure ◽  
System Parameters ◽  
Mass Redistribution ◽  
Novel Method ◽  
The Mathematical Model ◽  
Theoretical Considerations

The paper concerns problems related to controlling the dynamic properties of beam-like elements. The parameters of the investigated system can be changed by external factors, resulting in partial changes in the system mass redistribution. It is assumed that it is possible to control the system dynamics by shaping the object frequency structure. The paper introduces the mathematical model of the investigated cantilever beam filled with a Sponge Particle Structure. The continuous model has been simplified to a discrete multi-degree of freedom system. The influence of the system parameters on its behavior is discussed in details. The possible applications of the presented concept are proposed. The spectral vibration analyses were carried out. Theoretical considerations enabled the use of the preliminary semi-active method for controlling the vibration frequencies through a mass redistribution. Experimental studies were carried out to verify the proposed mathematical model.

scholarly journals Effect of firing mode on the structure and properties of highly porous ceramic materials based on alyumomagnezia spinel

2019 ◽  
pp. 37-42
Author(s):  
N. V. Buchilin ◽  
G. Yu. Lyulyukina ◽  
N. M. Varrik
Keyword(s):  
Heat Treatment ◽  
Mechanical Characteristics ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Preliminary Heat Treatment ◽  
Structure And Properties ◽  
Firing Mode ◽  
Highly Porous ◽  
Porous Ceramic Materials

The results of studies of sintering of spinel porous ceramics using aluminum and magnesium oxides as initial components without sintering additives are presented. It is shown that the optimal burning temperature range for the production of materials with an open-cellular porous structure is 1700‒1730 °C. It has been established that the preliminary heat treatment of oxides significantly affects the mechanical characteristics of materials. Materials were obtained with an interconnected porosity of up to 85 % and a compressive strength of up to 1,0 MPa. Ill. 6. Ref. 25.

scholarly journals Obtaining of dense and highly porous ceramic materials from metallurgical slag

2003 ◽  
Vol 35 (2) ◽  
pp. 85-91 ◽  
Author(s):  
E. Fidancevska ◽  
B. Mangutova ◽  
D. Milosevski ◽  
M. Milosevski ◽  
J. Bossert
Keyword(s):  
Flexural Strength ◽  
Porous Material ◽  
Mass Loss ◽  
Porous Ceramic ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
Metallurgical Slag ◽  
Porous System ◽  
Highly Porous ◽  
Porous Ceramic Materials

Glass-ceramics in a dense and highly porous form can be obtained from metallurgical slag and waste glass of TV monitors. Using polyurethane foam as pore creator, a highly porous system with porosity of 65 ? 5 %, E-modulus and flexural strength of 8 ? 3 GPa and 13 ? 3.5 MPa respectively can be obtained. This porous material had durability (mass loss) of 0.03 % in 0.1 M HCl that is identical with the durability of a dense composite.

PROSPECTS FOR THE USE OF CERAMIC MATERIALS FOR THE NEEDS OF THE AGRO-INDUSTRIAL COMPLEX

2021 ◽  
Vol 2 (143) ◽  
pp. 91-102
Author(s):  
Anatoliy V. Fedotov ◽  
◽  
Aleksey S. Dorokhov ◽  
Dmitriy A. Kovalev
Keyword(s):  
Wear Resistance ◽  
Crack Resistance ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Production Costs ◽  
Research Purpose ◽  
Industrial Complex ◽  
Highly Porous

As a result of poor quality, parts of tillage equipment have to be replaced 3-7 times a year. One of the reasons is the lack of attention to the possibility of using technical ceramics in agricultural engineering to improve the wear resistance and durability of machine parts. (Research purpose) The research purpose is in assessing the state of research and prospects for the use of ceramic materials in the Russian Federation for the needs of the agro- industrial complex. (Materials and methods) For the experiments has been used nanostructured boehmite obtained by hydrothermal synthesis to improve the properties of materials and coatings. The crack resistance was determined by the indentation method, and the methane content in the biogas was determined by the chromatographic method. (Results and discussion) The article presents the results of the use of aluminum oxide ceramics for the manufacture of parts of tillage equipment, which allows increasing the resource of parts for processing loamy soils by 2.4-4.5 times. The creation of nanocomposites is promising to increase the strength, wear resistance and crack resistance of the material. In the composition of the non-stick coating, the addition of boehmite increases the abrasion strength of the coating and the compressive strength of the samples by 2.2-2.7 times, and improves the quality of casting. The use of highly porous ceramic materials in the gating system helps to reduce waste, reduce production costs, and improve the quality of foundry products. (Conclusions) Ceramic materials due to their high hardness, wear resistance and corrosion resistance are becoming promising for use in the agro-industrial complex. The widespread use of modern ceramic materials as parts of tillage equipment, non-stick coatings and for the filtration of melts will improve the quality of casting, the durability of products, and reduce the cost of their production. Positive results on wastewater treatment with the use of highly porous ceramics allow us to consider it an innovative material for such purposes and it is advisable to continue research in this direction.

scholarly journals Magnetic resonance imaging of water absorption by highly porous ceramic materials

2019 ◽  
Vol 484 (5) ◽  
pp. 563-567
Author(s):  
E. V. Morozov ◽  
V. M. Bouznik ◽  
A. S. Bespalov ◽  
D. V. Graschenkov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Water Absorption ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Imaging Method ◽  
Resonance Imaging ◽  
Oxide Fibres ◽  
Highly Porous ◽  
Porous Ceramic Materials

By using the magnetic resonance imaging method the nontrivial character of water absorption was demonstrated for the first time in highly porous ceramic materials. The effect of hygroscopic memory was found out which is that the preferable concentration of absorbed water in certain areas within the sample persists regardless the subsequent sample wetting history. Coating the oxide fibres with fluorine-containing hydrocarbons in supercritical CO2 in order to hydrophobize the material has been shown to affect substantially the water transport within the sample that can be referred to as an effective approach to protect the porous materials from humid environment. The results obtained demonstrate the advantages of the magnetic resonance imaging in studying the water absorption processes and visualization of water pathways in highly porous ceramic materials.

Sintering Behavior of Highly Porous Ceramic Materials Based on the Al2O3–MgO System

2020 ◽  
Vol 56 (4) ◽  
pp. 417-424
Author(s):  
N. V. Buchilin ◽  
O. V. Basargin ◽  
N. M. Varrik ◽  
A. A. Lugovoi
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
Sintering Behavior ◽  
Highly Porous ◽  
Porous Ceramic Materials
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