scholarly journals Studying the Effects of Kaolinite Additions on the Properties of Ceramic Bodies Prepared from Alumina Powder by Slip Casting Technique

2017 ◽  
Vol 4 (ICBS Conference) ◽  
pp. 269-283
Author(s):  
Sabah Salman ◽  
Sheahab Al-jubouri ◽  
Haydar Al-obaidy
Keyword(s):  
Slip Casting ◽  
Alumina Powder ◽  
Casting Technique

scholarly journals Effect of Additives on Stability of Alumina—Waste Alumina Suspension for Slip Casting: Optimization Using Box-Behnken Design

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1738 ◽  
Author(s):  
Milan Vukšić ◽  
Irena Žmak ◽  
Lidija Ćurković ◽  
Danko Ćorić
Keyword(s):  
Ceramic Powder ◽  
Slip Casting ◽  
Growth Inhibitor ◽  
Poly Vinyl Alcohol ◽  
Alumina Powder ◽  
Suspension Stability ◽  
Concentrated Suspensions ◽  
Grain Growth Inhibitor ◽  
Ph Values ◽  
Weight Content

The green machining of alumina (Al2O3) green bodies generates a certain amount of waste alumina powder. Waste alumina ceramic powder should be disposed of as non-hazardous waste in a legally compliant manner. The influence of additives on the stability of 70 wt.% (≈40 vol.%) alumina—waste alumina water-based suspension was investigated in the presented research. A Box-Behnken three-factor response surface design was used for the preparation of stable highly-concentrated suspensions with the addition of three additives. The optimal amount of each additive was selected according to the obtained results of minimal apparent viscosity: 0.05 wt.% Tiron as dispersant, 0.1 wt.% poly (vinyl alcohol) as binder and 0.2 wt.% magnesium aluminate spinel as abnormal grain growth inhibitor. The analysis of variance was used to identify the contribution of each additive. The zeta potential and sedimentations tests were performed to confirm the suspension stability measurements at different pH values. Alumina particles were optimally dispersed at pH values between 8 and 11. According to the results, the investigated composition of 20 wt.% waste alumina powder (weight content, dry alumina powder), with the addition of optimal amounts of additives, shows a possible application in the production of ceramics by slip casting.

Optimisation of Performance of Dispersants in Aqueous Titanium Slips

2012 ◽  
Vol 520 ◽  
pp. 330-334 ◽  
Author(s):  
Qian Xu ◽  
Brian Gabbitas ◽  
Steven Matthews ◽  
De Liang Zhang
Keyword(s):  
Large Scale ◽  
Slip Casting ◽  
Streaming Potential ◽  
Casting Technique ◽  
Anionic Polyelectrolyte ◽  
Complex Shapes ◽  
Ti Powder ◽  
Ceramic Casting

Slip casting is a well-established ceramic casting technique used for large scale fabrication of ceramic products with complex shapes. A homogenous slip with a desired level of stability is required, which is controlled using a dispersant. This paper describes the selection and optimisation of various dispersants used to produce Ti powder slips. A consideration of the effect of concentration and pH of the solvent on the dispersion of anionic polyelectrolyte dispersants (Dispex N-40, Synthecol SD375 & Dolapix CE64) was examined by measuring the sedimentation height and rate, the streaming potential and the slip viscosity. It was found that Dolapix CE64 showed the best deflocculating effect at 0.3dw.% with pH of 7. In particular, the measurements on Dolapix CE64 gave consistent results. This indicated that Dolapix CE64 is an effective dispersant in the preparation of a titanium slip.

Behavior of the Nano Alumina Powder Conformed by Slip Casting under Microwave Sintering

2014 ◽  
Vol 793 ◽  
pp. 105-111
Author(s):  
A. Arellano ◽  
J. Lemus-Ruiz ◽  
D. Bouvard ◽  
L. Olmos
Keyword(s):  
Heating Rate ◽  
Microwave Sintering ◽  
Slip Casting ◽  
Alumina Powder ◽  
Secondary Phases ◽  
Transition Alumina ◽  
Air Atmosphere ◽  
Sample Characterization ◽  
Phase Quantification ◽  
Xrd Patterns

The effect of the transformation of phase in nanopowders of transition alumina has showed to be detrimental for the final characteristics of the consolidated materials. It was found that the complete transformation from gamma (γ-Al2O3) to alpha (α-Al2O3) alumina generated larger grain sizes and lower relative densities. This work studies the effect of slip casting preformed on the transformation phase of alumina during microwave sintering of α-alumina nanopowders. The sintering of the samples was carried out in a typical unimodal microwave furnace with a 2.5 GHz frequency. Sintering was carried out under air atmosphere at temperatures vary between 1100 and 1500 °C with heating rate of 100 and 200 °C/min and with a sintering plateau of 5 minutes. Sample characterization was performed by XRD, SEM, and TEM. The phase quantification was calculated using the Rietveld software from the XRD patterns. To have a good heating control in the microwave system it is possible by using slip casting to preform compact. It was observed that the heating rate has a strong effect on the phase transformations. Secondary phases like θ, θ’(x, y) appeared in samples sintered with a heating rate of 200 °C/min no matter the sintering temperature. Meanwhile the complete alumina transformation was found when sample were heating at 100 °C/min.

Integrated Process of Ceramic Slip Using Rotating Technique

2016 ◽  
Vol 1133 ◽  
pp. 161-165 ◽  
Author(s):  
Abdul Rahim Mahamad Sahab ◽  
Nor Hayati Saad ◽  
Farrahshaida M. Salleh ◽  
Azlin Hamidi ◽  
Doll Said Ngah ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Slip Casting ◽  
Conventional Technique ◽  
Ceramic Product ◽  
Advanced Technique ◽  
Moulding Process ◽  
Casting Technique ◽  
Green Strength ◽  
Ceramic Slip ◽  
Test Result

Hollow shape product from ceramic material is produced generally by slip casting technique. This conventional technique is widely used in ceramic industries. Ceramic slip compound by rotating technique namely slip rotary moulding process is studied for producing the hollow shape green ceramic product. From experimental studies this advanced technique has exemplified high potential in producing green hollow shape ceramic product for mass production. Laboratory test result shows that the rotating technique is able to produce hollow shape green ceramic product with desired thickness and sufficient green strength (1 MPa) able to hold during de-moulding process.

Utilization of Rice Husk Ash and Waste Sludge from Cutting Glass Manufacturing with Angthong Pottery

2014 ◽  
Vol 608 ◽  
pp. 103-107
Author(s):  
Yutthana Kaewtabut ◽  
Wansika Sirimongkol ◽  
Adisak Thueploy ◽  
Siriphan Nilpairach
Keyword(s):  
Rice Husk ◽  
Water Adsorption ◽  
Bending Strength ◽  
Rice Husk Ash ◽  
Slip Casting ◽  
Linear Shrinkage ◽  
Strength Increase ◽  
Casting Technique ◽  
Waste Sludge ◽  
Industrial Ecosystems

Efficiently utilization of rice husk ash (RHA) and waste sludge from cutting glass manufacturer (WSG) as additives to pottery clay would yield positive economic impacts, such as more friendly industrial ecosystems. In this study, The RHA and WSH were used as additives to Angthong pottery clay (APC) and casting and fired properties were examined. Two sets of sample with a mixture consisting of 60% APC, 20% RHA, and 20% WSG (CRG formula) and non-added clay (C100 formula) were prepared by slip casting technique. Samples were fired at temperature 900 °C and 1100°C; then the viscosity of slurry, linear shrinkage, water adsorption, and 3-point bending strength were measured. The results showed that the optimum viscosity for slip casting of CRG and C100 were 1638 cP and 983 cP, respectively. The water adsorptions of all samples decrease while their shrinkage and strength increase with temperature. At 900°C, the water adsorption and the strength of CRG were 32% and 1184 psi, respectively. Comparatively, CRG’s water absorption was 1.5 times higher than C100’s, while their mechanical strength was insignificantly different. This due to the RHA behaves as pore forming and the WSG promotes the sintering of samples.

scholarly journals Slip Casting of Alumina Powder Mixtures with Bimodal Size Distribution

1996 ◽  
Vol 104 (1209) ◽  
pp. 447-450 ◽  
Author(s):  
Seiichi TARUTA ◽  
Nobuo TAKUSAGAWA ◽  
Kiyoshi OKADA ◽  
Nozomu OTSUKA
Keyword(s):  
Size Distribution ◽  
Slip Casting ◽  
Alumina Powder ◽  
Bimodal Size Distribution ◽  
Powder Mixtures

scholarly journals Preparation and characterization of ZnO microfiltration membrane and its support using kaolin (DD3) and CaCO3

Cerâmica ◽  
2016 ◽  
Vol 62 (362) ◽  
pp. 186-190 ◽  
Author(s):  
B. Boudaira ◽  
A. Harabi ◽  
F. Bouzerara ◽  
S. Condom ◽  
F. Zenikheri ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Calcium Carbonate ◽  
Pore Size ◽  
Average Pore Size ◽  
Slip Casting ◽  
Average Pore ◽  
Membrane Layer ◽  
Casting Technique ◽  
Ceramic Support

Abstract The objective of the present paper was to prepare a ceramic support with membrane. Tubular ceramic supports prepared from kaolin (DD3) and calcium carbonate with 6 and 10 mm inner and outer diameters, respectively, were extruded and sintered at 1200 °C. It has been found that sintered supports had interesting characteristics: average pore size of about 5µm, porosity of about 50%, and monomodal pore size distribution. This support was used to be substrate for a membrane layer of microfiltration. This membrane layer was elaborated from zinc oxide, using slip casting technique. The specimens were subsequently sintered at 1000 °C. The microstructure and porosity as well as the permeability have also been studied. It has been found that the average pore size was about 1.2µm, the layer thickness was ~33µm, and the water permeability measured was about 880 L.h-1.m-2.bar-1.

scholarly journals Porous Ceramics Membrane Preparation from Ternary Mixtures of Ranong Kaolin, Calcium Carbonate and Silica

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
B. Darunee ◽  
C. Nucharee ◽  
B. Tripob
Keyword(s):  
Calcium Carbonate ◽  
Bending Strength ◽  
Pure Water ◽  
Porous Ceramic ◽  
Water Flux ◽  
Slip Casting ◽  
Weight Fraction ◽  
Porous Ceramics ◽  
Ternary Mixtures ◽  
Casting Technique

Porous ceramics membranes were prepared from ternary mixtures of Ranong kaolin, calcium carbonate and silica using slip casting technique. Totally 10 different composition mixtures were selected from the ternary diagram of CaCO3 : SiO2 : Clay with weight fraction of 0–0.19 : 0.28–0.47 : 0.52–0.71, respectively. The ceramic paste was first fired at 800°C and then sintered at temperatures of 1200, 1250 and 1300°C. The results show that firing temperature above 1200°C is probably too high to prepare the porous ceramics of the studied compositions. The porosity less than 26% is obtained from the samples sintered at 1250–1300°C. The highest porosities of more than 40% are observed from the samples sintered at 1200°C with the weight fraction of clay, calcium carbonate and silica between 0.524–0.562, 0.076–0.152, and 0.310–0.394, respectively. In this range of compositions, the linear shrinkage and water absorption is about 3% and 22%, respectively, while the bending strength is between 28–30 MPa. The pure water flux of samples prepared from mixture formula 9 sintered at 1200°C ranges between 52.4 and 368.8 L/m2.h at the operating pressures 30–120 kPa, indicating that the mixture compositions nearby the formula 9 are the best for porous ceramic production using Ranong kaolin.

scholarly journals Characterization and application of ceramic membranes prepared from Algerian kaolin

Cerâmica ◽  
2019 ◽  
Vol 65 (376) ◽  
pp. 554-561
Author(s):  
M. Aissat ◽  
S. Hamouda ◽  
N. Bettahar ◽  
B. J. Abu Tarboush ◽  
A. Bahmani
Keyword(s):  
Ceramic Membrane ◽  
Sol Gel ◽  
Slip Casting ◽  
Rejection Rate ◽  
Ceramic Membranes ◽  
Raw Material ◽  
Casting Technique ◽  
Thin Film Layer ◽  
Film Layer ◽  
Membrane Type

Abstract In this study, a new ceramic membrane type was used for the filtration of colored water. The membrane was prepared from local Algerian kaolin KT2 of Milia-type. The choice of this raw material was dictated by its natural abundance, to form the macroporous support prepared by the slip casting technique. A functional thin film layer (with a pore size of about 0.2 μm) produced by the sol-gel method was deposited on the support to reduce the porosity. A detailed study was conducted because of the importance of this layer and the improvement which brought to the filtration process. Ceramic membranes were tested for the removal of bromophenol red (BR) under a filtration pressure of 3 bar and a duration of 2 h of treatment. The results revealed a rejection rate of 100% for BR, especially after the addition of the inorganic layer. The material was characterized by DTA, TGA, XRD and SEM. The retention and the permeability of BR were also studied.

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