Fabrication of Silicon Carbide Reticulated Porous Ceramics through Organic Foam Infiltration Process

2013 ◽  
Vol 745-746 ◽  
pp. 646-651 ◽  
Author(s):  
Guo Jian Jiang ◽  
Min Hui Wang ◽  
Yun Ying Liu ◽  
Liu Liu Ding ◽  
Ling Deng ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Zeta Potential ◽  
Ph Value ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Porous Ceramics ◽  
Solid Content ◽  
The Other ◽  
Infiltration Process ◽  
Absolute Value

Reticulated silicon carbide porous ceramics was fabricated through organic foam infiltration process by using silicon carbide slurry prepared from silicon carbide, alumina and clay and other raw materials. The effect of solid content on the viscosity and Zeta potential of the slurry were investigated. The results showed that the viscosity of slurry increased with the increase of the solid content. The absolute value of Zeta potential increased with the increase of pH value of the slurry from acid to alkaline aptitudes, and it became smaller with the further increase of the pH value. The maximum was reached at the pH around 10. The viscosity of slurry in the range of 4000mPas ~ 5000mPas was appropriate to prepare reticulated silicon carbide porous ceramics. The sintered body collapsed or cracked apparently, when the viscosity was too low. On the other hand, the viscosity could not be too high because its hard for slurry to impregnate foam. The performance of the samples coated once and recoated was compared. The porosity of the sample with one layer was higher than that of the samples with two layers. However, the recoating process improved the compressive strength and flexural strength of the reticulated silicon carbide porous ceramic.

Preparation and Characterization of Quartz Porous Ceramic Materials Using the Yangtze River Sand

2013 ◽  
Vol 804 ◽  
pp. 52-56
Author(s):  
Yan Ping Feng ◽  
Zhi Wen Qiu ◽  
Xiao Bin Ma ◽  
Lei Zhao ◽  
Xin Chao Chen ◽  
...  
Keyword(s):  
Yangtze River ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Low Grade ◽  
The Yangtze River ◽  
Insulation Property ◽  
River Sand ◽  
Porous Ceramic Materials

In order to lay raw materials foundation for increasing the performance of insulating brick with the low grade quartz sand along the Yangtze River, the quartz porous ceramic materials was researched in this paper. The results show the porosity of the porous quartz ceramics decreased with an increase in the sintering temperature. The pore is like the bowl shape, and the pore is closed pore, which is help to improve the heat insulation property of quartz porous ceramics. The CaSiO4 is produced in the ceramics after sintering processing. The shape is better, and the microstructure is circular and symmetrical pore, which is help to improve the mechanical property of quartz porous ceramics.

Zeta Potential of Sepiolite in Aqueous System

2012 ◽  
Vol 427 ◽  
pp. 208-211 ◽  
Author(s):  
Cong Chen ◽  
Fei Wang ◽  
Jin Sheng Liang ◽  
Qing Guo Tang ◽  
Ya Lei Chen
Keyword(s):  
Zeta Potential ◽  
Negative Charge ◽  
Ph Value ◽  
Aqueous System ◽  
Solid Content ◽  
Experimental Results

Zeta potential of purified sepiolite in aqueous system was studied as a function of pH and solid content. From the experimental results, it was found that sepiolite surface acquired a negative charge in water at natural pH, and the value of zeta potential decreased with the increase of pH value. Solid content had effect on zeta potential, but it can be minimized by the increase of time.

Influence of Clay Materials on Acicular Mullite Porous Ceramic

2011 ◽  
Vol 412 ◽  
pp. 344-347 ◽  
Author(s):  
Jian Er Zhou ◽  
Xiao Zhen Zhang ◽  
Jing Zhang ◽  
Yong Qing Wang ◽  
Shi Kai Zhao ◽  
...  
Keyword(s):  
Raw Materials ◽  
Slenderness Ratio ◽  
Porous Ceramic ◽  
Impurity Content ◽  
Average Diameter ◽  
Porous Ceramics ◽  
Mullite Ceramic ◽  
Tem Analysis ◽  
Acicular Mullite ◽  
Clay Materials

Porous acicular mullite ceramic was prepared by in-situ reaction sintering, using clay materials and Al (OH)3) as the raw materials. The influences of different clay materials on the phase composition, formation of acicular grains and microstructure of prepared porous ceramics were investigated. Results show that the metal oxide impurities were beneficial for the synthesis of acicular mullite. The prepared porous ceramic from Longyan kaolin with high impurity content has the highest mullite content of 93.5%, and composed of interlaced acicular grains with high slenderness ratio of 26.4 and large average diameter of about 0.7μm when sintered 1400°C for 2h. The TEM analysis indicates that the growth direction of acicular grains is along the [001] direction (c axis) of orthorhombic mullite crystals.

Study on the Molding Process of Nano-Ceramics

2012 ◽  
Vol 496 ◽  
pp. 211-214
Author(s):  
Zhan Xin Zhang ◽  
Hui Feng Bo ◽  
Ru Zheng Wang
Keyword(s):  
Corrosion Resistance ◽  
Milling Time ◽  
Ph Value ◽  
Solid Phase ◽  
Raw Materials ◽  
Solid Content ◽  
Phase Volume ◽  
Molding Process ◽  
Concentrated Suspension ◽  
Technical Parameters

Nano-ceramics with excellent strength, toughness, oxidation resistance, corrosion resistance and the like metals superplasticity show an attractive application prospect. However, the production of high density of nano-ceramics is very difficult. This paper focuses on the preparation of concentrated suspension slurry, the main technical parameters and the additive proportion of raw materials. The optimum dosage of dispersant PAANa is 1.4wt%. When the PH value is about 9, the best stability of slurry is achieved. When the milling time reaches 10h, the lowest viscosity is reached. The solid content viscosity of slurry increases with the decrease of the slurry temperature. Solid phase volume with 40vol% of slurry can be successfully cast out the mould homogeneously.

Evaluation of polyaluminium ferric chloride (PAFC) as a composite coagulant for water and wastewater treatment

2003 ◽  
Vol 47 (1) ◽  
pp. 127-132 ◽  
Author(s):  
B. Gao ◽  
Q. Yue ◽  
J. Miao
Keyword(s):  
Zeta Potential ◽  
Ferric Chloride ◽  
Ph Value ◽  
Raw Materials ◽  
Color Removal ◽  
Petrochemical Plant ◽  
Water And Wastewater Treatment ◽  
Turbidity Removal ◽  
Iron And Steel ◽  
Composite Coagulant

Coal gangue is a kind of waste from coal mine processing. Polyaluminium ferric chloride (PAFC), a new type of inorganic composite coagulant, was prepared by using the waste from the Mineral Bureau of Yanzhou, China, hydrochloric acid and calcium carbonate as raw materials. The relationship between the stability of ferric ion and the ionic strength of solution was investigated. The zeta potential of PAFC hydrolysis products of PAFC and the coagulation performances under different pH value were discussed. The turbidity removal properties of PAFC, polyaluminium (PAC) and polyferric sulfate (PFS) were compared, and the color removal effect of PAFC for the wastewater containing suspended dyes was also tested. In addition, the coagulation performance of PAFC for actual wastewaters from petrochemical plant, iron and steel plant, and coal mining processing was evaluated. The experimental results suggest that PAFC took a maximum value of zeta potential at about pH 5.8 on the positive side. Compared with PAC, PAFC gives better turbidity removal performance in the range of pH from 7.0 to 8.4. PAFC gives good color removal performance on suspension dyes. PAFC also gives good wastewater purifying results for the actual wastewater. Therefore, PAFC is a high-effect and stable water treatment agent.

Obtaining Efficiency Porous Ceramics with Controlling Size of Porosity

2014 ◽  
Vol 925 ◽  
pp. 464-468 ◽  
Author(s):  
Aleksandrs Korjakins ◽  
Liga Upeniece ◽  
Diana Bajare
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Construction Materials ◽  
Energy Resource ◽  
Resource Depletion ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Primary Energy ◽  
Space Technology

Anxiety of society about global warming is increasingly growing and interest about construction materials that are less harmful to the environment is growing as well. Manufactures and scientists are urged to think about the usage of more effective resources, which are available and necessary for production, as well as to find possibilities and solutions for the decrease of primary energy resource depletion by producing ecological materials. Clay is one of local raw materials that can help solving growing problems by production of ceramic materials and their products, as well as more widely distributed sediments, which mainly form the upper part of Earth’s crust. Alongside traditional ceramic materials, porous ceramics are also widely researched, becoming an increasingly popular material in the world, mainly owing to their wide possibilities of usage in different technical and technology industries – from construction to mechanical engineering, health industry and even space technology. Obtaining porous ceramics using different kind of burnable fillers, such as natural products obtained as waste from agricultural industry, as well as controllable form products obtained from polymers, allow to form desirable porous structures within wide ranges: with pore dimensions starting from some micrometers up to 2-3 millimeters. Porous ceramic materials obtained within this research are breathing, they are thermostable materials, resistant to thermal impacts, corrosion and are easy in processing. During the presented research porous ceramics were produced using different kinds of burnable fillers. The optimal burning treatment was developed for obtaining required mechanical properties of porous ceramics. The physical-mechanical properties of obtained ceramics were evaluated.

On the Factors Influencing the Liquidity of Slip Casting Al2O3 Slurry

2016 ◽  
Vol 680 ◽  
pp. 115-119
Author(s):  
Zhen Hua Geng ◽  
Kai Li ◽  
Ping Wu ◽  
Hai Jian Li
Keyword(s):  
Zeta Potential ◽  
Mass Fraction ◽  
Ph Value ◽  
Solid Phase ◽  
Slip Casting ◽  
Casting Process ◽  
Test Results ◽  
Absolute Value ◽  
Layer Effect ◽  
Potential Test

Abstract: This paper use zeta potential test and dynamic viscosity test to research the influence of different factors such as pH value, mass fraction of solid phase and dispersant content on the liquidity of Al2O3 slurry. The test results show that, when the solid-phase mass fraction and particle size are given, the absolute value of zeta potential increases with the rise of pH value, raise at first then descrease with the adding of (NaPO3)6. This article analyzes the phenomena from a legal point of electric double layer effect. The results of liquidity test are consistent with zeta potential test. The optimum value of pH value, mass fraction of solid-phase and dispersant content are determined by formulation design. The study develop a Al2O3 slurry with high fluidity which has an important significant in slip casting process of Al2O3 ceramics.

scholarly journals Study on Preparation Technology and Properties of Tiutai Porous Ceramics

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Hui Wang ◽  
Jine Shang ◽  
Xuesong Yang
Keyword(s):  
Surface Tension ◽  
Ph Value ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Preparation Technology ◽  
Weakly Alkaline ◽  
Main Research ◽  
Water Ph ◽  
Porous Ceramic Materials

In this paper, three kinds of iron tailings samples were selected as the main research object, and an iron tailings porous ceramic material was prepared by adding pore forming agent. The crystal structure, surface morphology and microstructure of the composites were observed by XRD and SEM. Finally, the effects of porous ceramics on water pH, conductivity and surface tension were studied. By adjusting the recipe, the final finding of a better formula for firing: iron tailings (1 #): cellulose = 15: 2.57. The interior of the ceramic formed a denser pore structure, and the pores were more uniform, the aperture was more consistent. And the pH value of the water can be weakly alkaline, the conductivity increased by 58.75% and the surface tension decreased by 0.37%. The results provide the basis for the application of the tailings porous ceramic materials in the biological field.

scholarly journals Effect of Activator on Properties of SiC Porous Ceramics

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Xinhua Yu ◽  
Qinqin Tian ◽  
Yanfei Li
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Porous Silicon ◽  
Flexural Strength ◽  
Porous Ceramic ◽  
Testing Machine ◽  
Porous Ceramics ◽  
Al2o3 Content ◽  
Porous Silicon Carbide ◽  
Silicon Carbide Ceramics

In this study, porous silicon carbide ceramics were prepared by using silicon carbide as the main material and sodium carboxymethyl cellulose (CMC) as the pore-forming agent. SiO2-Y2O3-Al2O3 and SiO2-kaolin were used as the builders respectively. This study is about the effect of SiO2-Y2O3-Al2O3 and SiO2-kaolin content on the structure and mechanical properties of porous silicon carbide. SiO2-Y2O3-Al2O3 and SiO2-kaolin affect the porosity, hardness and flexural strength of silicon carbide porous ceramics. In this experiment, the porosity of porous ceramics was measured by Archimedes method. The hardness was measured by Rockwell hardness tester. The flexural strength was measured by universal testing machine. The results show that the properties of silicon carbide porous ceramics prepared by SiO2-Y2O3-Al2O3 are better than that of SiO2-kaolinite when the SiO2 -Y2O3-Al2O3 content is 20%. With SiO2-Y2O3-Al2O3 as the combustion agent, porous ceramic with better performance can be prepared at 1500 ℃. When the SiO2-Y2O3-Al2O3 content is 20%, the prepared silicon carbide porous ceramics has a large porosity and excellent mechanical properties, the opening porosity of 23.73%, hardness and flexural strength of 62 and 15.47MPa, from the fracture can be seen more porous and evenly distributed.

Study on the Dispersion of Graphite as Pore Former

2011 ◽  
Vol 412 ◽  
pp. 370-373
Author(s):  
Qiang Li ◽  
Fei Ma
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Pore Structure ◽  
Ph Value ◽  
Influence Factors ◽  
Porous Ceramics ◽  
Pore Former ◽  
Sedimentation Method ◽  
Dispersion Media

Graphite powders are important pore former, and widely used in the preparation of many kinds of porous ceramics. The dispersion of pore former controls the homogenous pore structure of porous ceramics, and deeply influences its properties. The dispersion and its influence factors of graphite powders in water and alcohol were systematically studied. The dispersion of graphite powders in water and alcohol were investigated by sedimentation method. It was found that alcohol as dispersion media can improve the dispersibility of graphite powders. In addition, the influence of different surfactants on the disperisibility was also studies. It can be confirmed that surfactant can prompt the dispersion of graphite powders in water. The zeta potential and particle size of graphite powders in different pH value were tested to understand its dispersion.

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