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.

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.

Preparation and Characterization of Quartz Porous Ceramic Materials Using the Yangtze River Sand

2013 ◽  
Vol 804 ◽  
pp. 52-56
Author(s):  
Yan Ping Feng ◽  
Zhi Wen Qiu ◽  
Xiao Bin Ma ◽  
Lei Zhao ◽  
Xin Chao Chen ◽  
...  
Keyword(s):  
Yangtze River ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Low Grade ◽  
The Yangtze River ◽  
Insulation Property ◽  
River Sand ◽  
Porous Ceramic Materials

In order to lay raw materials foundation for increasing the performance of insulating brick with the low grade quartz sand along the Yangtze River, the quartz porous ceramic materials was researched in this paper. The results show the porosity of the porous quartz ceramics decreased with an increase in the sintering temperature. The pore is like the bowl shape, and the pore is closed pore, which is help to improve the heat insulation property of quartz porous ceramics. The CaSiO4 is produced in the ceramics after sintering processing. The shape is better, and the microstructure is circular and symmetrical pore, which is help to improve the mechanical property of quartz porous ceramics.

CERAMICS BASED ON ORGANOSILICON POLYMERS-PRECURSORS: MICROSTRUCTURE AND PROPERTIES (review). Part 1

2021 ◽  
pp. 21-33
Author(s):  
A.M. Shestakov ◽  
Keyword(s):  
Ceramic Composite ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Structure And Properties ◽  
Ceramic Foams ◽  
Controlled Porosity ◽  
Composition Structure ◽  
Silicon Based ◽  
Porous Ceramic Materials ◽  
Organosilicon Polymers

The paper considers the process of pyrolysis of polymers-precursors, and also shows the influence of various parameters of technological processes for obtaining ceramics on its composition, structure, and properties. The main types of binary, ternary and multicomponent silicon-based ceramics, methods of its preparation, features of structure and properties are considered, and promising directions of application of ceramics are determined. The possibility of obtaining porous ceramic materials (ceramic foams) with controlled porosity and ceramic composite materials with a given composition is noted.

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

scholarly journals DEVELOPMENT OF RESOURCE-SAVING TECHNOLOGY OF POROUS-HOLLOW CERAMIC STONES

2021 ◽  
pp. 94-102
Author(s):  
Liudmyla Shchukina ◽  
Olha Hamova ◽  
Maksym Herasev
Keyword(s):  
Sandy Loam ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Raw Material ◽  
Heating Rates ◽  
Resource Saving ◽  
Plastic Properties ◽  
Firing Mode ◽  
Porous Ceramic Materials ◽  
Rational Composition

A resource-saving technology of porous ceramic materials using low-quality non-sintering sandy loam as a basic raw material has been developed. Based on the analysis of the plastic properties of two- and three-component ceramic masses, including sandy loam, expanded clay and fuel slag in various ratios, it was found that the required level of their plasticity provides the content of the main raw material in the following range (wt%): fuel slag – 15 – 20; sandy loam – 50 – 65; expanded clay – 20 – 30. By the method of planning the experiment, the rational composition of the three-component ceramic mass was substantiated. This which contains: 62.5 wt.  % sandy loam, 20 wt. % medium-sintering plastic clay as a plasticizer and 17.5 wt. % fuel slag of TPP as a porous agent. For the developed mass, the main technological properties were investigated, which made it possible to recommend the drying mode of the raw material – 60 hours, the optimal firing temperature – 950 °С. Such conditions ensure that samples are obtained without drying cracks and signs of deformation. Оn the results of dilatometric analysis of mass  the rational mode of firing high-hollow semifinished products was designed. The firing mode provides for a 44-hour firing and a decrease in the heating rates in the areas of dehydration of clay minerals, direct quartz transition and intensive sintering of the mass, as well as a decrease in the cooling rate in the area of the reverse quartz transition. The proposed firing mode provides the degree of sintering and their properties necessary for ceramic materials. Based on the developed mass under the recommended drying and firing modes, porous ceramic materials with an apparent density of 1.48 g/cm3, a compressive strength of 18.2 MPa and frost resistance of 30 cycles were obtained. The developed materials belong to the group of conditionally effective, and if 50% of the voids are organized, they can be classified as effective.

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 Investigation of the structure and properties of ceramic materials with a rigid system of microfiltration transport pores based on basalt fibers

2021 ◽  
Author(s):  
Siarhei Besarab ◽  
Sergey Azarov ◽  
Justyna Sauka ◽  
Evgeny Petyushik ◽  
Tatyana Azarova ◽  
...  
Keyword(s):  
Phase Composition ◽  
Porous Ceramic ◽  
Basalt Fiber ◽  
Ceramic Materials ◽  
Structure And Properties ◽  
Basalt Fibers ◽  
Rigid System ◽  
Composition Structure ◽  
The Relationship ◽  
Porous Ceramic Materials

The report provides information on the formation of the structure of porous ceramic materials made of basalt fiber obtained by pressing with subsequent sintering. The phase composition, structure, and properties of ceramics are studied. The relationship between the structure, phase composition, and properties of the ceramic material is established.

scholarly journals Study on Preparation Technology and Properties of Tiutai Porous Ceramics

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Hui Wang ◽  
Jine Shang ◽  
Xuesong Yang
Keyword(s):  
Surface Tension ◽  
Ph Value ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Preparation Technology ◽  
Weakly Alkaline ◽  
Main Research ◽  
Water Ph ◽  
Porous Ceramic Materials

In this paper, three kinds of iron tailings samples were selected as the main research object, and an iron tailings porous ceramic material was prepared by adding pore forming agent. The crystal structure, surface morphology and microstructure of the composites were observed by XRD and SEM. Finally, the effects of porous ceramics on water pH, conductivity and surface tension were studied. By adjusting the recipe, the final finding of a better formula for firing: iron tailings (1 #): cellulose = 15: 2.57. The interior of the ceramic formed a denser pore structure, and the pores were more uniform, the aperture was more consistent. And the pH value of the water can be weakly alkaline, the conductivity increased by 58.75% and the surface tension decreased by 0.37%. The results provide the basis for the application of the tailings porous ceramic materials in the biological field.

Evaluation of the parameters of the porous structure and permeability of monofraction ceramics

2020 ◽  
pp. 35-36
Author(s):  
Yu. N. Kryuchkov
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Porous Structure ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Structure Parameters ◽  
Average Radius ◽  
Hydraulic Radius ◽  
Porous Ceramic Materials

A method for assessing the structure parameters of porous ceramic materials by porosity and particle size is presented. Based on it, a physically more rigorous than the well-known Cozeny formula is obtained, a formula for determining the average (hydraulic) radius of the capillaries of permeable materials. The presented results of the calculation of the average radius of the capillaries of porous ceramics based on electrocorundum according to the obtained formula are in better agreement with experimental data than the calculations by the Cozeny formula.

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