Porous alumina ceramics for slip casting molds

1995 ◽  
Vol 1 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Yoshihito Kondo ◽  
Yutaka Hashizuka ◽  
Shojiro Okada ◽  
Kozo Ishizaki
Keyword(s):  
Porous Alumina ◽  
Slip Casting ◽  
Alumina Ceramics

scholarly journals Alumina ceramics prepared with new pore-forming agents

2008 ◽  
Vol 2 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Zuzana Zivcová ◽  
Eva Gregorová ◽  
Willi Pabst
Keyword(s):  
Thermal Analysis ◽  
Porous Alumina ◽  
Slip Casting ◽  
Porous Ceramics ◽  
Rice Starch ◽  
Alumina Ceramics ◽  
Poppy Seed ◽  
Biological Origin ◽  
Filtration Membranes ◽  
Wide Range

Porous ceramics have a wide range of applications at all length scales, ranging from filtration membranes and catalyst supports to biomaterials (scaffolds for bone ingrowths) and thermally or acoustically insulating bulk materials or coating layers. Organic pore-forming agents (PFAs) of biological origin can be used to control porosity, pore size and pore shape. This work concerns the characterization and testing of several less common pore-forming agents (lycopodium, coffee, fl our and semolina, poppy seed), which are of potential interest from the viewpoint of size, shape or availability. The performance of these new PFAs is compared to that of starch, which has become a rather popular PFA for ceramics during the last decade. The PFAs investigated in this work are in the size range from 5 ?m (rice starch) to approximately 1 mm (poppy seed), all with more or less isometric shape. The burnout behavior of PFAs is studied by thermal analysis, i.e. thermogravimetry and differential thermal analysis. For the preparation of porous alumina ceramics from alumina suspensions containing PFAs traditional slip casting (into plaster molds) and starch consolidation casting (using metal molds) are used in this work. The resulting microstructures are investigated using optical microscopy, combined with image analysis, as well as other methods (Archimedes method of double-weighing in water, mercury intrusion porosimetry).

Anisotropy of Compressive Strength in Porous Alumina Ceramics

2014 ◽  
Vol 604 ◽  
pp. 153-156 ◽  
Author(s):  
Ieva Zake-Tiluga ◽  
Ruta Svinka ◽  
Visvaldis Svinka
Keyword(s):  
Compressive Strength ◽  
Sintering Temperature ◽  
Porous Alumina ◽  
Slip Casting ◽  
Mechanical Anisotropy ◽  
Alumina Ceramics ◽  
Casting Method ◽  
Concrete Technology ◽  
Pore Former ◽  
Aerated Concrete

Anisotropy of the compressive strength was investigated in porous alumina based ceramics produced by slip casting method. Aluminium paste was used as pore former similarly as in the aerated concrete technology. Materials were sintered at 1650°C and 1750°C. The apparent porosity of the investigated materials was in the range of 54±1% to 60±2%. The compressive strength of the samples in the directions parallel and perpendicular to the sample expansion direction was in the range from 3.8±0.3 to 13.0±1.1 MPa and from 6.4±1.3 to 27.0±1.1 MPa, respectively. The mechanical anisotropy was related with the flattening of the introduced pores. The level of mechanical anisotropy was affected by the initial composition of the slurry and sintering temperature.

scholarly journals Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology

2021 ◽  
Vol 13 (12) ◽  
pp. 6739
Author(s):  
Darko Landek ◽  
Lidija Ćurković ◽  
Ivana Gabelica ◽  
Mihone Kerolli Mustafa ◽  
Irena Žmak
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Heating Rate ◽  
Sintering Temperature ◽  
Nonlinear Models ◽  
Slip Casting ◽  
Holding Time ◽  
Alumina Ceramics ◽  
Aqueous Suspensions ◽  
Temperature Heating

In this work, alumina (Al2O3) ceramics were prepared using an environmentally friendly slip casting method. To this end, highly concentrated (70 wt.%) aqueous suspensions of alumina (Al2O3) were prepared with different amounts of the ammonium salt of a polycarboxylic acid, Dolapix CE 64, as an electrosteric dispersant. The stability of highly concentrated Al2O3 aqueous suspensions was monitored by viscosity measurements. Green bodies (ceramics before sintering) were obtained by pouring the stable Al2O3 aqueous suspensions into dry porous plaster molds. The obtained Al2O3 ceramic green bodies were sintered in the electric furnace. Analysis of the effect of three sintering parameters (sintering temperature, heating rate and holding time) on the density of alumina ceramics was performed using the response surface methodology (RSM), based on experimental data obtained according to Box–Behnken experimental design, using the software Design-Expert. From the statistical analysis, linear and nonlinear models with added first-order interaction were developed for prediction and optimization of density-dependent variables: sintering temperature, heating rate and holding time.

scholarly journals Evaluation of mechanical properties of porous alumina ceramics obtained using rice husk as a porogenic agent

Cerâmica ◽  
2019 ◽  
Vol 65 (suppl 1) ◽  
pp. 70-74 ◽  
Author(s):  
G. C. Ribeiro ◽  
B. A. Fortes ◽  
L. da Silva ◽  
J. A. Castro ◽  
S. Ribeiro
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
Porous Alumina ◽  
Alumina Ceramics
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