Formation of highly-porous ceramic based on silicon carbide

1995 ◽  
Vol 33 (5-6) ◽  
pp. 262-267
Author(s):  
G. G. Gnesin ◽  
L. A. Shipilova ◽  
L. I. Chernyshev ◽  
V. Loikovskii ◽  
A. Prez
Keyword(s):  
Silicon Carbide ◽  
Porous Ceramic ◽  
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.

Formation of highly porous electrochemically etched silicon carbide: A novel reusable adsorbent for air purification technology

2019 ◽  
Vol 218 ◽  
pp. 521-528
Author(s):  
Jaganathan Senthilnathan ◽  
Ambika Selvaraj ◽  
Jechan Lee ◽  
Ki-Hyun Kim ◽  
Masahiro Yoshimura
Keyword(s):  
Silicon Carbide ◽  
Air Purification ◽  
Etched Silicon ◽  
Highly Porous

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

Fabrication and properties of ultra highly porous silicon carbide by the gelation–freezing method

2010 ◽  
Vol 30 (14) ◽  
pp. 2889-2896 ◽  
Author(s):  
Manabu Fukushima ◽  
Masayuki Nakata ◽  
You Zhou ◽  
Tatsuki Ohji ◽  
Yu-ichi Yoshizawa
Keyword(s):  
Silicon Carbide ◽  
Porous Silicon ◽  
Porous Silicon Carbide ◽  
Freezing Method ◽  
Highly Porous

scholarly journals Buckling Porous SiC Membranes

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 785
Author(s):  
Markus Leitgeb ◽  
Christopher Zellner ◽  
Manuel Dorfmeister ◽  
Michael Schneider ◽  
Ulrich Schmid
Keyword(s):  
Thin Film ◽  
Silicon Carbide ◽  
Crystalline Silicon ◽  
Single Crystalline Silicon ◽  
Design Concepts ◽  
Photochemical Etching ◽  
Potential Applications ◽  
Etching Parameters ◽  
Porous Sic ◽  
Highly Porous

In preliminary studies it could be shown that single crystalline silicon carbide wafers can be porosified with metal assisted photochemical etching. Furthermore, the generation of porous areas which are locally defined is possible with this method. By adjusting the etching parameters, a highly porous layer (degree of porosity of 90%) can be formed which is under-etched by a line of breakage. By depositing a compressively stressed amorphous SiC:H thin film on top of a porous region, the a-SiC:H film can be locally separated from the substrate, resulting in a buckled membrane configuration. Such membranes might open up potential applications in MEMS design concepts.

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.

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.

Grain boundary corrosion of highly porous ceramic TiO 2 foams is reduced by annealing and quenching

2016 ◽  
Vol 36 (1) ◽  
pp. 179-188 ◽  
Author(s):  
Benjamin Müller ◽  
Håvard Haugen ◽  
Siri Lene Simonsen ◽  
Hanna Tiainen
Keyword(s):  
Grain Boundary ◽  
Porous Ceramic ◽  
Highly Porous
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