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 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 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 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.

Characteristics of High Content Steel Briquettes Using Nanosized Solid Binders

2021 ◽  
Vol 21 (7) ◽  
pp. 3863-3867
Author(s):  
Seung-Ju Lim ◽  
Seong-Gyu Seo ◽  
Hyung-Sun Yoon
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Average Particle Size ◽  
Average Particle ◽  
Eds Analysis

In this study, we investigated the characteristics of high-content steel briquettes produced using various nanoscale solid binders and steel byproducts (SS, SCS, SLD, and BSD). The average particle size was 0.171 nm for S5, 0.065 nm for S1, 0.058 nm for S4, and 0.040 nm for S2 and S3. The SEM-EDS analysis of the solid power binder resulted in mostly rectangular images. The compressive strength of the high-content steel briquettes was 120 kgf/cm2, with the highest HSL1 using S4 binders. The compressive strength of the high-content steel briquettes was in the order of HSS4 > HSS1 > HSS3 > HSS5 > HSS2.

Structural, Microscopy Analysis and Compressive Strength of ZnO–CuO Nanocomposites

2020 ◽  
Vol 12 (2) ◽  
pp. 163-167
Author(s):  
K. Kavitha ◽  
T. Subba Rao ◽  
R. Padma Suvarna ◽  
M. Prasanna Kumar
Keyword(s):  
Compressive Strength ◽  
Sol Gel ◽  
Average Particle Size ◽  
Testing Machine ◽  
Research Area ◽  
Strength Analysis ◽  
Average Particle ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Active Research

Currently, researches on nanocomposites become an active research area due its unique properties. Earlier, many researches are done for synthesizing the multidimensional structures for developing efficient and new Nano devices. In this present work, we synthesized ZnO–CuO nanocomposites using sol–gel method. The obtained nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) analysis and Compressive strength analysis using compressive testing machine (CTM). Herein, the structure and size of the ZnO–CuO nanocomposites were studied using XRD. And the average particle size was found to be 34 nm. The TEM analysis has the evidence of the XRD result. The enhancement in compressive strength of the ZnO–CuO nanocomposites was determined using CTM machine up to 4 wt.%.

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.

Fabrication, Structure and Properties of Porous SiC Ceramics with High Porosity and High Strength

2010 ◽  
Vol 105-106 ◽  
pp. 608-611 ◽  
Author(s):  
Shao Feng Wang ◽  
Chang An Wang ◽  
Jia Lin Sun ◽  
Li Zhong Zhou ◽  
Yong Huang
Keyword(s):  
Compressive Strength ◽  
High Strength ◽  
Butyl Alcohol ◽  
Solid Loading ◽  
High Porosity ◽  
Reaction Bonding ◽  
Sintering Additive ◽  
Sic Ceramics ◽  
Tert Butyl Alcohol ◽  
Porous Sic

Porous SiC ceramics with high porosity and high strength were fabricated by gelcasting, with tert-butyl alcohol (TBA) as solvent, acrylamide (AM) as monomer, and in-situ reaction bonding with a-Al2O3 as sintering additive. SiC suspension with 10 vol% solid loading was successfully solidified by gel-casting to form high strength green body. The results showed that the compressive strength of the porous SiC ceramics increased with sintering temperature from 1300 to 1450°C, but porosity had little change, due to formation of more volume of cristobalite and mullite phases on the surface of SiC grains, accompanied by a large volume expansion effect. Very narrow single-peak distributions with about 2 mm median pore diameter could be found for the porous SiC ceramics. The porosity and compressive strength of the porous SiC ceramics sintered at 1450°C were 71.21 % and 12.14 MPa, respectively.

scholarly journals Extraction of Silica Nanoparticles from Rice Husk Ash (RHA) and Study of Its Application in Making Composites

2019 ◽  
Vol 40 ◽  
pp. 67-72 ◽  
Author(s):  
Bimal Kumar Raut ◽  
Khim Prasad Panthi
Keyword(s):  
Compressive Strength ◽  
Silica Nanoparticles ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Product ◽  
Average Particle Size ◽  
Average Particle ◽  
Cement Block ◽  
Ceramics Matrix ◽  
Matrix Nanocomposites

Nanotechnology is the most emerging field in the area of different scientific research. Various methods of synthesis of nanoparticles are available. The wet chemical synthesis method is applicable in the extraction of silica nanoparticles from Rice Husk Ash (RHA). Rice husk is a form of waste product from the rice milling industries which is produced in an abundance amount in and around the country. Rice husk which is generally left on the field as a waste contains 60% silica content and can be economically viable raw materials for the extraction of silica [1-2]. Initially, Rice husk was burnt to obtain its ash. Then, a simple bottom-up approach, the sol-gel method was applied, and fine powder silica in the nanoscopic range was extracted. After extraction of it, internal arrangement and average particle size were recognized by XRD while molecular components and structure present in silica were identified by FTIR. The obtained silica was then used in making of ceramics matrix nanocomposites (particularly silica-sand cement block), and its mechanical properties were identified by compressive strength test using Instron testing machine which was found to be increased in comparing with the compressive strength of ceramics composite (Sand cement block) prepared in the same ratio and same size of mold as that of ceramics matrix nanocomposites. The ceramics matrix nanocomposites acquiring higher mechanical strength than Ceramics composite occurred due to the incorporation of Silica nanoparticles.

Investigation on Properties of Bentonite Type in Cold Bonded Pelletization of Flue Dust

2011 ◽  
Vol 409 ◽  
pp. 743-748
Author(s):  
Guan Jhou Chen ◽  
Weng Sing Hwang ◽  
Shih Hsien Liu ◽  
Jaw Min Chou
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Electrostatic Precipitator ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Average Particle ◽  
Fixed Amount ◽  
Flue Dust

In the integrated steel mills fabrication processes, the by-product of flue dust and electrostatic precipitator dust were found to be rich with large amounts of iron and carbon content and it could be recycled as a raw material for blast furnaces. In this study, we use the “Cold-bonded Pellet; CBP” technique to prepare the recycling samples for subsequent processing. Therefore, this study investigated under a fixed amount of bentonite added, the choice of different types of bentonite on the powder granulation performance and strength of particle duration effects, bentonite used as a basis for adjustment. The results showed that Bentonite samples of the granulation efficiency increase, relative to its yield and the rate of sticky increase. In general, CBP particle compressive strength increased, duration have increased, and found that curing condition B are large than the A method. In addition, by particle size analysis results show that, bentonite average particle size of 11-12μm have better compressive strength. Comprehensive assessment of granulation and mechanical properties, of which A label in four Bentonite can be preferred.

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.

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