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The effect of commercial rice husk ash additives on the porosity, mechanical properties, and microstructure of alumina ceramics


Ali, Mohammed Sabah and Hanim, M. A. Azmah and Tahir, S. M. and Jaafar, C. N. A. and Mazlan, Norkhairunnisa and Matori, Khamirul Amin (2017) The effect of commercial rice husk ash additives on the porosity, mechanical properties, and microstructure of alumina ceramics. Advances in Materials Science and Engineering, 2017 (2586026). pp. 1-10. ISSN 1687-8434; ESSN: 1687-8442


A porous ceramic is made from composite materials which consist of alumina and commercial rice husk ash. This type of ceramics is obtained by mixing the commercial rice husk ash as a source of silica (SiO2) and a pore forming agent with alumina (Al2O3) powder. To obtain this type of ceramic, a solid-state technique is used with sintering at high temperature. This study also investigated the effects of the rice husk ash ratios on the mechanical properties, porosity, and microstructure. The results showed that, by increasing the content of the rice husk ash from 10 to 50 wt%, there is an increase in the porosity from 42.92% to 49.04%, while the mechanical properties decreased initially followed by an increase at 30 wt% and 50 wt%; the hardness at 20 wt% of the ash content was recorded at 101.90 HV1. When the ash content was increased to 30 wt% and 50 wt%, the hardness was raised to 150.92 HV1 and 158.93 HV1, respectively. The findings also revealed that the tensile and compressive strengths experienced a decrease at 10 wt% of the ash content and after that increase at 30 wt% and 50 wt% of rice husk ash. XRD analysis found multiple phases of ceramic formation after sintering for the different rice husk ash content.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Faculty of Science
Institute of Tropical Forestry and Forest Products
DOI Number: https://doi.org/10.1155/2017/2586026
Publisher: Hindawi Publishing Corporation
Keywords: Composite materials; Alumina; Commercial rice husk ash; Porous ceramic
Depositing User: Mohd Hafiz Che Mahasan
Date Deposited: 16 Oct 2018 09:33
Last Modified: 16 Oct 2018 09:33
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1155/2017/2586026
URI: http://psasir.upm.edu.my/id/eprint/63427
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