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.

scholarly journals Enhancing Compressive Strength of Reticulated Porous Alumina by Optimizing Processing Conditions

2021 ◽  
Vol 11 (10) ◽  
pp. 4517
Author(s):  
Sujin Lee ◽  
Chae Young Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Porous Alumina ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Mechanical Instability ◽  
Porosity And Permeability

Recently, porous ceramics have received much attention from researchers because of their excellent thermal and chemical stabilities compared to their counterparts (such as porous polymers and metals), despite their inferior mechanical instability. Among the various types of porous ceramics, reticulated porous ceramics have significant industrial potential because of their synergistic high porosity and permeability. However, to the best of our knowledge, there is insufficient data on the processing conditions or preparing optimal reticulated porous alumina. Therefore, we prepared and characterized reticulated porous alumina specimens by controlling various processing conditions, namely average particle size, solid loading, binder, and dispersant. The data obtained were used to assess whether the compressive strength of the reticulated porous alumina could be enhanced and to discuss the potential of these materials for various applications.

scholarly journals The Effects of a Zirconia Addition on the Compressive Strength of Reticulated Porous Zirconia-Toughened Alumina

2021 ◽  
Vol 11 (19) ◽  
pp. 9326
Author(s):  
Chae-Young Lee ◽  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Porous Metals ◽  
Porous Zirconia ◽  
Zirconia Toughened Alumina

Porous ceramics have attracted researchers due to their high chemical and thermal stability. Among various types of porous ceramics, reticulated porous ceramics have both high porosity and good permeability. These properties of porous ceramics are difficult to replace with porous metals and polymers. ZTA is used in a variety of applications, and a wealth of experimental data has already been collected. However, research reports on reticulated porous zirconia-toughened alumina (ZTA) are insufficient. Therefore, we prepared reticulated porous ZTA via the replica template method. In this study, various processing conditions (average particle size, zirconia content, solid loading, dispersant, and thickener) were adjusted to improve the compressive strength of the reticulated porous ZTA. As a result, the optimized processing conditions for improving the compressive strength of reticulated porous ZTA could be determined.

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 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.

Porous Ceramic Humidity Sensors Using Sol-Gel Processed ZrTiO4 Nanoparticles

2006 ◽  
Vol 45 ◽  
pp. 1803-1808 ◽  
Author(s):  
I.C. Cosentino ◽  
E.N.S. Muccillo ◽  
F.M. Vichi ◽  
R. Muccillo
Keyword(s):  
Porous Ceramic ◽  
Mercury Porosimetry ◽  
Sol Gel ◽  
Average Particle Size ◽  
Nitrogen Adsorption ◽  
Zirconium Oxychloride ◽  
Average Particle ◽  
Titanium Tetraisopropoxide ◽  
X Ray Diffraction ◽  
Adsorption Analysis

Ceramic ZrTiO4 powders were prepared by a sol-gel method using zirconium oxychloride and titanium tetraisopropoxide. In situ high temperature X-ray diffraction results show that crystallization of the amorphous gel starts at 400°C. Single-phase ZrTiO4 nanoparticles of 46 nm average particle size, determined by nitrogen adsorption analysis, were obtained after heat treatment at 450°C for 1 h. After pressing these sinteractive powders, pellets with controlled pore size distribution were obtained by sintering at temperatures as low as 400°C. The analysis of pores by mercury porosimetry gives an average porosity of 45%. The electrical resistivity, determined by impedance spectroscopy measurements at 24°C under different humidity environments, shows the ability of these pellets to adsorb water vapor in the porous surfaces.

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.

The Influence of Sintering Temperature on Properties of Silicon Carbide Porous Ceramic Filter Membrane

2015 ◽  
Vol 655 ◽  
pp. 32-35
Author(s):  
Chuang Jun Huang ◽  
Xiang Yun Deng ◽  
Yang Shan Sun ◽  
Guang Hao Sun ◽  
Xin Guan
Keyword(s):  
Sintering Temperature ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Average Particle Size ◽  
Ceramic Filter ◽  
Testing System ◽  
Average Particle ◽  
Mass Ratio ◽  
Filter Membrane ◽  
Filtration Membrane

The average particle size of SiC used as raw materials is 60 μm, the filter membrane in a mass ratio of each component are: SiC : binder: sodium carboxymethyl cellulose (CMC): deionized water =9:1:1:20. Method of producing membrane by means of spin coating, the sintering temperature was set in different ranges. The Archimedes drainage method was used to measure its porosity, and the filter pressure of membrane was charactered by the filter pressure testing system, SEM was performed to characterize its surface morphology and microstructure. The results show that: when the temperature rises from 1225 °C to 1325 °C, the filter pressure of SiC porous ceramic filter membrane decrease firstly and then increase; the atlas trend of the porosity is roughly opposite with the filter pressure, the maximum of the porosity value is about 42% when the temperature reaches 1300°C, at this temperature, the filter pressure reaches a minimum value and the surface of the filtration membrane is the most flat. When the temperature reaches 1350 °C, the surface of the film started showing a plaque.

scholarly journals Hydroxyapatite-Based Magnetic Bionanocomposite as Pharmaceuticals Carriers in Chitosan Scaffolds

2021 ◽  
Vol 5 (2) ◽  
pp. 37
Author(s):  
Anderson Valério Chaves ◽  
Rafael Melo Freire ◽  
Victor Pinheiro Feitosa ◽  
Nágila Maria Pontes Silva Ricardo ◽  
Juliano Casagrande Denardin ◽  
...  
Keyword(s):  
Bone Growth ◽  
Average Particle Size ◽  
Electronic Spectroscopy ◽  
Average Particle ◽  
High Porosity ◽  
Magnetite Fe3o4 ◽  
Freeze Dried ◽  
Chitosan Scaffolds ◽  
Co Precipitation ◽  
New System

Hydroxyapatite (HA) is a bioceramic very similar to the mineral component of bones and teeth. It is well established that osteoblasts grow better onto HA-coated metals than on metals alone. Herein, the preparation of a new system consisting of magnetite (Fe3O4) and HA functionalized with oleic acid and simvastatin (SIMV), and incorporated in chitosan (CHI) scaffolds, was undertaken. HA was synthesized by the hydrothermal method, while Fe3O4 was synthesized by co-precipitation. The polymer matrix was obtained using a 2% CHI solution, and allowed to stir for 2 h. The final material was freeze-dried to produce scaffolds. The magnetic properties remained unchanged after the formation of the composite, as well as after the preparation of the scaffolds, maintaining the superparamagnetism. CHI scaffolds were analyzed by scanning electronic spectroscopy (SEM) and showed a high porosity, with very evident cavities, which provides the functionality of bone growth support during the remineralization process in possible regions affected by bone tissue losses. The synthesized composite showed an average particle size between 15 and 23 nm for particles (HA and Fe3O4). The scaffolds showed considerable porosity, which is important for the performance of various functions of the tissue structure. Moreover, the addition of simvastatin in the system can promote bone formation.

Controlling the Nanostructural Characteristics of TiO2 Nanoparticles Derived from Ilmenite Mineral of Bangka Island through Sulfuric Acid Route

2013 ◽  
Vol 391 ◽  
pp. 34-40 ◽  
Author(s):  
Hanum Latifa ◽  
Akhmad Herman Yuwono ◽  
F. Firdiyono ◽  
Nurul Taufiqu Rochman ◽  
Sri Harjanto ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Iron Powder ◽  
Sol Gel ◽  
Average Particle Size ◽  
Volume Ratio ◽  
Average Particle ◽  
Processing Conditions ◽  
Calcination Time ◽  
Titanyl Sulfate ◽  
Minor Elements

The ilmenite mineral (FeO.TiO2) from Bangka Island-Indonesia is an important source for synthesizing TiO2nanoparticles. However, the process is rather difficult since this mineral still contains many impurities and minor elements. Therefore, controlling the synthesizing route parameters is essential for obtaining the desired TiO2nanoparticle characteristics. In the current work, we proposed a modified process involving the use of sulfuric acid through sol-gel method to provide titanyl sulfate (TiOSO4) solution as the inorganic precursor. For investigation purposes, several parameters were varied including volume ratio of water and titanyl sulfate, addition of iron powder (seeding) and dextrin coagulant, calcination time and temperature. The results showed that TiO2nanoparticles can be succesfully synthesized using TiOSO4precursor derived from Bangka ilmenite. Under all processing conditions, the resulting TiO2nanoparticles have sphere-like shape and were indexed as the anatase TiO2phase. The results also showed that the average particle size was reduce from 96 188 nm to 32 40 nm when the volume ratio of water and titanylsulfate was increased from 3:1 to 6:1. The addition of iron powder as seeding has improved the purity of TiO2to ~ 95.01 wt%, in comparison to that of without seeding, which is ~92.78 wt%.

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.

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