Investigation on the Effects of Various Pore-Forming Agents on Bending Strength and Porosity of Al2O3 Ceramics
Kerbala Journal for Engineering Science,
AbstractThe current paper shows an economic and simple way which useful approach to produce porous ceramics (alumina) using three types of pore-forming agents (PFAs) utilizing a fugitive materials technique. Yeast material (natural active), ash of rice husk (commercial), and waste of graphite from used primary batteries have been used as (PFAs). Practical results revealed that with increasing the PFA ratio for yeast material (natural active), ash of rice husk, and waste of graphite the porosity increased from 30.2 to 63.8 %, 42.9 to 49.0%, and 37.3 to 61.1% respectively. Utilizing the three-point bending test, the evaluation of the mechanical behavior of porous ceramics (alumina) specimens was a function of the level of porosity. The characterization of mechanical behavior exhibit that the bending strength using the ash of rice husk increased at 50 wt% (92.38 ± 2.68 MPa) and 30 wt %( 93.03±4.07) due to the presence of the ceramic phases. While the bending strength of porous ceramics (alumina) using yeast material (natural active) and waste of graphite as PFAs decreased from 72.56±3.07 to 20.72±1.58 MPa and from 71.28±1.78 to 30.42±2.15 MPa respectively. Recommended application fields include the metal of molten, hot gas filters, and implantation processes.
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