scholarly journals Preparation and Characterization of a Low-Cost and Natural Material-Based Reticulated Porous Diatomite-Kaolin Composite

2020 ◽  
Vol 10 (6) ◽  
pp. 2125
Author(s):  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
Se-Hun Kwon
Keyword(s):  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Low Cost ◽  
Porous Ceramic ◽  
Mercury Porosimetry ◽  
Porous Ceramics ◽  
Natural Material ◽  
High Porosity ◽  
Porous Metals ◽  
High Temperature Stability

In recent years, porous ceramics have been increasingly developed owing to their high levels of high-temperature stability and chemical stability. These properties are far superior to porous polymers and porous metals. As a representative porous ceramic, reticulated porous ceramics have been fabricated for several decades owing to their overwhelmingly high porosity, which is usually above 90%. There are growing concerns about the environmental problems. However, the data on the preparation of low-cost and natural material-based reticulated porous ceramics are not enough. Therefore, the authors studied the preparations and characterizations of reticulated porous ceramics prepared using diatomite and kaolin, and compared them to typical reticulated porous alumina. The obtained data were used to determine whether the reticulated porous diatomite-kaolin composite can be practically used in non-hard loading conditions. The structural properties and dielectric breakdown strength of the reticulated porous ceramics were examined using scanning electron microscopy, mercury porosimetry, μ-computed tomography (CT), and standard test apparatus of dielectric breakdown voltage.

scholarly journals Effect of Processing Conditions on the Properties of Reticulated Porous Diatomite–Kaolin Composites

2020 ◽  
Vol 10 (20) ◽  
pp. 7297
Author(s):  
Sujin Lee ◽  
Chae Young Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Porous Ceramic ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Natural Material ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Porous Metals ◽  
Mechanical Instability

Porous ceramics have been extensively investigated because of their high-temperature and chemical stabilities, which are far superior to those of porous polymers and porous metals, despite their mechanical instability. Among various kinds of porous ceramic, reticulated porous ceramics have attracted considerable attention because of their extremely high porosity, which is generally higher than 90% and can maximize the advantages of this class of materials. However, to the best of our knowledge, sufficient data are not available on the preparation of low-cost, abundant, and natural material-based reticulated porous ceramics. Therefore, we obtained and characterized reticulated porous diatomite–kaolin composites prepared under various processing conditions, such as solid loading, average particle size, and pore density. The experimental data were used to investigate whether the densities and compressive strengths of the reticulated porous diatomite–kaolin composite can be tailored, and to assess the potential of these materials in different application fields.

High Temperature Performance of Coiled Glass Capacitors

2012 ◽  
Vol 2012 (HITEC) ◽  
pp. 000192-000198 ◽  
Author(s):  
Eugene Furman ◽  
Amanda Baker ◽  
Steve Perini ◽  
Mohan Monoharan ◽  
Douglas Kushner ◽  
...  
Keyword(s):  
High Temperature ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Temperature Stability ◽  
Sodium Content ◽  
Flat Panel Display ◽  
High Temperature Stability ◽  
Thin Glass ◽  
High Dielectric ◽  
Power Capability

Alkali-free flat panel display glass is produced in large quantity and has excellent electrical insulating properties at high temperature. Aluminum borosilicate glass with alkaline-earth modifier has low sodium content and low dielectric loss (tan δ <0.1 at 250°C), high dielectric breakdown strength (109 V/m) and excellent high temperature stability. In addition, roll-to-roll processing of thin glass sheet has been demonstrated and glass capacitors that are configured in a coil. Excellent high power capability of these glasses was confirmed by analytical, finite element, and finite difference modeling. The modeling work indicates that a combination of hybrid electrode design and effective heat loss at the interface can further extend power capability of glass capacitors. Alkali-free glass is an ideal candidate material for high temperature capacitors.

Environmental Friendly Ceramic Building Materials

2016 ◽  
Vol 690 ◽  
pp. 150-155 ◽  
Author(s):  
Toyohiko Sugiyama ◽  
Keiji Kusumoto ◽  
Masayoshi Ohashi ◽  
Akinori Kamiya
Keyword(s):  
High Performance ◽  
Building Materials ◽  
Bending Strength ◽  
Low Cost ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Heat Island ◽  
Solar Reflectance ◽  
Ceramic Building

The global warming is one of the most serious problems. The decrease of CO2 emissions in our daily life is an important subject today. Recently, an application of water retentive materials as a paving material has attracted a great deal of attention in Japan. This material is effective for reducing heat island phenomenon, which is also a recent problem in many cities in Japan. Water retained in the material during rainfall evaporates when heated by sunshine. The latent heat absorbed by evaporating water works to cool the surroundings. The water retentive ceramic products are expected to be useful for building materials as well as pavements. Several performances are required on the water retentive ceramics when it is used as building materials. Its cost and quality are the important factors. Porous ceramic materials formed by pressing without firing is one of ideal low cost and eco-friendly candidates. The porous ceramics is also expected to be produced from recycled ceramic materials. By optimizing its composition and forming method, a water retentive material with high performance was developed. The trial product had the properties as follows; fracture toughness: 1300N, bending strength: 175N/cm, water absorption: larger than 30%, and precision in size (length): +-0.5mm for 150mm. The product showed also enough frost resistance. In this paper, the fundamental properties of the porous ceramics prepared without firing are discussed with referring to the results of the field experiments.Another subject recently studied by several tile manufactures in Japan is the glazed tile with high solar reflectance. The exterior walls covered with such a high solar reflectance tile keeps the surface temperature of the wall lower under the strong sunshine of summer. It is effective against heat-island phenomenon. In this paper, the outline of the research results on visible and infrared reflectance of many kinds of glazes is also discussed.

Thermal Conductivity of Porous Alumina-Zirconia Prepared by Foam Technique for Applications in Cooling Systems of Artificial Satellites

2010 ◽  
Vol 636-637 ◽  
pp. 161-167 ◽  
Author(s):  
Ana Coh O. Hirschmann ◽  
Maria do Carmo de Andrade Nono ◽  
Cosme Roberto Moreira Silva
Keyword(s):  
Thermal Conductivity ◽  
Porous Alumina ◽  
Mercury Porosimetry ◽  
Tetragonal Zirconia ◽  
Porous Ceramics ◽  
Zirconia Ceramic ◽  
Artificial Satellites ◽  
High Porosity ◽  
Cooling Systems ◽  
Loop Heat Pipes

Porous ceramics are of great interest due to their numerous potential applications. The objective of the present investigation was to produce porous alumina with 3 mol % yttria-stabilized tetragonal zirconia (Y-TZP). This material will be used in cooling systems of satellites. To obtain the porous ceramics the direct foaming technique was used. This method is based on the preparation of a stable foam to which a slurry of alumina and zirconia is added. The mixture is then vigorously stirred for incorporation of air. The sintered ceramics were characterized by scanning electron microscopy, mercury porosimetry and thermal conductivity. The tests performed with the porous alumina-zirconia ceramic composite obtained by this method, showed low thermal conductivity values, high porosity and uniform microstructure with 20–100 µm open pores. The results show that the alumina-zirconia composites tested in this study have a potential for application in loop heat pipes of cooling systems of satellites.

Characterization of the Calcium Phosphate Porous Ceramic Obtained by Foam Consolidation Using Albumin

2007 ◽  
Vol 361-363 ◽  
pp. 971-974 ◽  
Author(s):  
Christiane Ribeiro ◽  
José Carlos Bressiani ◽  
Ana Helena A. Bressiani
Keyword(s):  
Calcium Phosphate ◽  
Porous Ceramic ◽  
Mercury Porosimetry ◽  
Porous Ceramics ◽  
Tissue Growth ◽  
Porous Microstructure ◽  
Interconnected Pores

In many in-vivo and in vitro studies, the behavior of calcium phosphate ceramics like β - tricalcium phosphate in biological environments has been reported to be predictive and positive. In terms of bone tissue growth, this ceramic can be more attractive presenting a porous microstructure. To obtain biomaterial quality ceramics, in this investigation β- TCP porous ceramics were prepared by a special consolidation method with albumin as a foam generating agent. This technique enables preparation a variety of formats with complex geometries. To obtain porous samples using albumin, heat had to be introduced into the system during the consolidation stage. After consolidation, the samples were sintered at 1250oC for 30 minutes and characterized using X-ray diffractometry, scanning electron microscopy and mercury porosimetry. The foams that were obtained by this method exhibited spherical and interconnected pores, characteristics desirable in biomedical implants.

Porous Alumina-Zirconia Prepared by Foam Technique for Applications as Cooling Systems of Artificial Satellites

2008 ◽  
Vol 591-593 ◽  
pp. 865-869
Author(s):  
Ana Coh O. Hirschmann ◽  
Maria do Carmo de Andrade Nono ◽  
R.R. Riehl ◽  
Cosme Roberto Moreira Silva
Keyword(s):  
Porous Alumina ◽  
Mercury Porosimetry ◽  
Heat Pipes ◽  
Porous Ceramics ◽  
Industrial Applications ◽  
Artificial Satellites ◽  
High Porosity ◽  
Cooling Systems ◽  
Uniform Microstructure ◽  
New Applications

The interest in porous ceramics has increased concurrently with new processes and new applications. This material has been used in several industrial applications such as filters, catalysis and sensors. The objective of the present investigation was to produce porous alumina with 3 % mol yttria stabilized zirconia in tetragonal crystalline structure (Y-TZP). This material will be used in cooling systems of satellites, due to its mechanical properties and chemical inertia. To obtain the porous ceramics was used the direct foaming technique, which is a method based on the preparation of a stable foam slurry and a slurry of alumina and zirconia that are later mixed and blended for incorporation of air in the mixture. The sintered ceramics was characterized by scanning electronic microscopy, mercury porosimetry and permeability measurements. The porous Al2O3–ZrO2 ceramics obtained showed high porosity and uniform microstructure with 20–100 ,m open pores. The results from these alumina zirconia composites showed a potential to apply in heat pipes.

Preparation of Silicon Nitride Porous Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 824-827 ◽  
Author(s):  
Jian Liu ◽  
Kai Liu ◽  
Hong Sheng Wang ◽  
Fang Gao ◽  
Rong Liao
Keyword(s):  
Dielectric Properties ◽  
Silicon Nitride ◽  
Process Parameters ◽  
Porous Ceramic ◽  
Three Dimensional ◽  
High Strength ◽  
Porous Ceramics ◽  
Cold Isostatic Pressing ◽  
High Porosity ◽  
Low Dielectric

A silicon nitride porous ceramics having excellent mechanical strength and dielectric properties can be employed as a wave-transparent material. The silicon nitride porous ceramic contains a plurality of silicon nitride crystal grains with pores formed in grain boundary which forms a three-dimensional network structure. The properties of the silicon nitride porous ceramics was studied , the porous ceramics was prepared by different process parameters, including the pressure of cold isostatic pressing, temperature of sintering and sintering atmosphere, etc.; A high porosity(>50%), high strength(>120MPa), low dielectric properties(ε<3.2) silicon nitride ceramic can be prepared by appropriate process parameters.

scholarly journals Effect of the Sintering Temperature on the Compressive Strengths of Reticulated Porous Zirconia

2021 ◽  
Vol 11 (12) ◽  
pp. 5672
Author(s):  
Chae-Young Lee ◽  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Sintering Temperature ◽  
Porous Ceramic ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Average Particle ◽  
High Porosity ◽  
Wide Range ◽  
Porous Zirconia

Porous ceramics have separation/collection (open pore) and heat-shielding/sound-absorbing (closed pore) characteristics not found in conventional dense ceramics, increasing their industrial importance along with dense ceramics. Reticulated porous ceramics, a type of porous ceramic material, are characterized by a three-dimensional network structure having high porosity and permeability. Although there have been numerous studies of porous zirconia, which is already widely used, there are insufficient reports on reticulated porous zirconia, and it is still challenging to improve the compressive strength of reticulated porous ceramics thus far, especially considering that too few studies have been published on this topic. Therefore, we prepared reticulated porous zirconia specimens using the replica template method. In this study, the compressive strength outcomes of reticulated porous zirconia were analyzed by controlling the PPI value (25, 45, 60, and 80 PPI) of the sacrificial polymer template, the average zirconia particle size (as-received, coarse, intermediate, and fine), and the sintering temperature (1400, 1500, and 1600 °C). Consequently, we confirm that it is possible to prepare reticulated porous zirconia with a wide range of strengths (0.16~1.26 MPa) as needed with an average particle size and while properly controlling the sintering temperature.

Study on Preparation of Ceramic Material and its Properties

2014 ◽  
Vol 686 ◽  
pp. 57-60
Author(s):  
Ya Li Liu
Keyword(s):  
Fly Ash ◽  
Red Mud ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Porous Ceramic ◽  
High Strength ◽  
Porous Ceramics ◽  
Raw Material ◽  
High Porosity

This paper introduces the classification, properties and application of porous ceramic materials, reviewed preparation of porous ceramics. Taking fly ash and red mud as the main raw material to generate porous ceramics, the paper study the influence of different proportions of raw materials, sintering temperature, porosity of porous ceramic sample rate, bending strength, and microstructure. The results show that, fly ash and red mud proportioning and sintering temperature are the main factors that influence the structure and properties of samples. The 4# sample is a kind of high porosity and high strength quality of porous ceramics.

scholarly journals Elaboration and characterization of mullite-anorthite-albite porous ceramics prepared from Algerian kaolin

Cerâmica ◽  
2018 ◽  
Vol 64 (369) ◽  
pp. 126-132 ◽  
Author(s):  
F. Rouabhia ◽  
A. Nemamcha ◽  
H. Moumeni
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Raw Material ◽  
High Porosity ◽  
Additive Concentration ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Porous Texture ◽  
Xrd Patterns

Abstract Mullite-anorthite-albite porous ceramic materials were successfully prepared by a solid-state reaction between kaolin clay and two different additives (CaCO3 and Na2CO3). The starting raw material was characterized by X-ray fluorescence, X-ray diffraction (XRD) and dynamic light scattering techniques. The effect of CaCO3 and Na2CO3 concentration (10 to 70 wt%) on structure, morphology and thermal properties of the obtained ceramics was investigated by XRD, scanning electron microscopy and differential scanning calorimetry (DSC) techniques. The XRD patterns showed that mullite (3Al2O3.2SiO2), anorthite (CaO.Al2O3.2SiO2) and albite (Na2O.Al2O3.6SiO2) were the main crystalline phases present in the materials. The morphology investigation revealed the porous texture of obtained ceramics characterized by the presence of sponge-like structure mainly due to the additive decomposition at high temperatures. The DSC results confirm the presence of four temperature regions related to the kaolin thermal transformations and the formation of minerals. The temperature and enthalpy of mineral formation are additive concentration dependent. As a result, the optimal content of additives which allowed the coexistence of the three phases, a sponge-like morphology, and high porosity without cracks corresponded to 15 wt% CaCO3, 15 wt% Na2CO3, and 70 wt% kaolin.

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