Processing and properties of low cost macroporous alumina ceramics with tailored porosity and pore size fabricated using rice husk and sucrose |
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| Affiliation: | 1. School of Aerospace, Mechanical & Manufacturing Engineering, RMIT University, Melbourne, VIC 3001, Australia;2. The University of Queensland, School of Mechanical and Mining Engineering, Brisbane, QLD 4072, Australia;1. Center of Materials Science and Technology, Nuclear and Energy Research Institute – IPEN, 2242 Lineu Prestes Avenue, University City, São Paulo, Brazil;2. Federal University of Rio Grande do Norte – UFRN, University Camp of Lagoa Nova, Rio Grande do Norte, Natal, Brazil;1. Centre National des Recherchesen Science des Matériaux, BorjCedria Techno-Park, B.P. 95-2050, HammamLif, Tunis, Tunisia;2. Instituto de ceramica y vidrio, CSIC, c/kelsen, 2849 Madrid, Spain;1. School of Material Science and Engineering, Zhengzhou University, NO.100 Science Avenue, Zhengzhou, 450001, China;2. Henan Key Laboratory of High-Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, Zhengzhou, 450052, China |
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| Abstract: | The present study demonstrates a cost effective way to fabricate porous ceramics with tailored microstructures using rice husk (RH) of various range of particle sizes as a pore former and sucrose as a binder as well as a pore former. Sample microstructures reveal randomly oriented elongated coarse pores and fine pores (avg. size 4 μm) created due to burnout of RH and sucrose, respectively. Porous alumina ceramics with 20–66 vol% porosity and 50–516 μm avg. pore size (length), having isolated and/or interconnected pores, were fabricated using this process. Mechanical properties of the porous samples were determined as a function of porosity and pore microstructure. The obtained porous ceramics exhibited flexural strength of 207.6–22.3 MPa, compressive strength of 180–9.18 MPa, elastic modulus of 250–18 GPa and hardness of 149–18 HRD. Suggested application area includes thermal, filtration, gas purging etc. |
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| Keywords: | Low cost porous alumina Rice husk Sucrose Microstructure mechanical properties |
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