Mechanical strength of highly porous ceramic foams with thin and lamellate cell wall from particle-stabilized foams

2018 ◽  
Vol 44 (5) ◽  
pp. 5780-5784 ◽  
Author(s):  
Wenlong Huo ◽  
Xiaoyan Zhang ◽  
Yugu Chen ◽  
Dong Wang ◽  
Jingjing Liu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Mechanical Strength ◽  
Porous Ceramic ◽  
Ceramic Foams ◽  
Highly Porous

Thermal conductivity of highly porous ceramic foams with different agar concentrations

2015 ◽  
Vol 139 ◽  
pp. 66-69 ◽  
Author(s):  
Wei Cao ◽  
Xudong Cheng ◽  
Lunlun Gong ◽  
Ye Li ◽  
Ruifang Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Porous Ceramic ◽  
Ceramic Foams ◽  
Highly Porous

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.

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

Highly Porous Zirconia Ceramic Foams with Low Thermal Conductivity from Particle-Stabilized Foams

2016 ◽  
Vol 99 (11) ◽  
pp. 3512-3515 ◽  
Author(s):  
Wen-Long Huo ◽  
Xiao-Yan Zhang ◽  
Yu-Gu Chen ◽  
Yu-Ju Lu ◽  
Wen-Ting Liu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Zirconia Ceramic ◽  
Ceramic Foams ◽  
Low Thermal Conductivity ◽  
Porous Zirconia ◽  
Highly Porous

Cobalt Oxide-Based Structured Thermochemical Reactors/Heat Exchangers for Solar Thermal Energy Storage in Concentrated Solar Power Plants

2014 ◽  
Author(s):  
Christos Agrafiotis ◽  
Martin Roeb ◽  
Christian Sattler
Keyword(s):  
Power Plants ◽  
Structural Integrity ◽  
Heat Storage ◽  
Porous Ceramic ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Porous Structures ◽  
Solar Thermal Energy ◽  
Ceramic Foams ◽  
Cyclic Reduction

Based on the characteristics of the oxide redox pair system Co3O4/CoO as a thermochemical heat storage medium and the advantages of porous ceramic structures like honeycombs and foams in heat exchange applications, the idea of employing such ceramic structures coated with or manufactured entirely from a redox material like Co3O4, has been implemented. Thermo-Gravimetric Analysis (TGA) experiments have demonstrated that laboratory-scale Co3O4-coated, redox-inert ceramic foams and honeycombs exhibited repeatable, cyclic reduction-oxidation operation within the temperature range 800–1000°C, employing all the redox material incorporated, even at loading levels exceeding 100 wt% loading percentages. To further improve the volumetric heat storage capacity, monolithic porous ceramic foams made entirely of Co3O4 were manufactured, together with analogous pellets. Such porous structures were also capable of cyclic reduction–oxidation, exploiting the entire amount of Co3O4 used in their manufacture. In this perspective, “open” porous structures like the ones of ceramic foams seem to have significant advantages in addressing problems associated with cyclic expansion-contraction that could be detrimental to structural integrity.

A Simplified Model for Effective Thermal Conductivity of Highly Porous Ceramic Fiber Insulation

2015 ◽  
Vol 7 (4) ◽  
Author(s):  
Nicholas P. G. Lumley ◽  
Emory Ford ◽  
Eric Minford ◽  
Jason M. Porter
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Natural Convection ◽  
Effective Thermal Conductivity ◽  
Research Effort ◽  
Porous Ceramic ◽  
Ceramic Fiber ◽  
Chemical Process Industry ◽  
Thermophysical Model ◽  
Highly Porous

Highly porous ceramic fiber insulations are beginning to be considered as a replacement for firebrick insulations in high temperature, high pressure applications by the chemical process industry. However, the implementation of such materials has been impeded by a lack of experimental data and predictive models, especially at high gas pressure. The goal of this work was to develop a general, applied thermophysical model to predict effective thermal conductivity, keff, of porous ceramic fiber insulation materials and to determine the temperature, pressure, and gas conditions under which natural convection is a possible mode of heat transfer. A model was developed which calculates keff as the sum of conduction, convection, and radiation partial conductivities. The model was validated using available experimental data, including laboratory measurements made by this research effort. Overall, it was concluded that natural convection is indeed possible for the most porous insulations at pressures exceeding 10 atm. Furthermore, keff for some example insulations was determined as a function of temperature, pressure, and gas environment.

Mechanical strength and damage tolerance of highly porous alumina ceramics produced from sintered particle stabilized foams

2016 ◽  
Vol 42 (7) ◽  
pp. 8478-8487 ◽  
Author(s):  
Carolina Tallon ◽  
Chayuda Chuanuwatanakul ◽  
David E. Dunstan ◽  
George V. Franks
Keyword(s):  
Mechanical Strength ◽  
Damage Tolerance ◽  
Porous Alumina ◽  
Alumina Ceramics ◽  
Highly Porous
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