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J. Korean Ceram. Soc. > Volume 60(1); 2023 > Article
Journal of the Korean Ceramic Society 2023;60(1): 99-112.
doi: https://doi.org/10.1007/s43207-022-00248-3
Mechanical behaviour of porous kaolin-based ceramics for potential catalysts support applications
David O. Obada1,2,3, Kazeem A. Salami1,3, Abdulmumin A. Alabi1, Ayodeji N. Oyedeji1,3, Stefan Csaki4,6, Tomáš Hulan4, Alok K. Meher5
1Department of Mechanical Engineering, Ahmadu Bello University, 810222 Zaria, Nigeria
2Africa Centre of Excellence on New Pedagogies in Engineering Education, Ahmadu Bello University, 810222 Zaria, Nigeria
3Multifunctional Materials Laboratory, Shell Office Complex, Department of Mechanical Engineering , Ahmadu Bello University, 810222 Zaria, Nigeria
4Department of Physics , Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 01 Nitra, Slovakia
5Central Pollution Control Board, 110032 Delhi, India
6Department of Horticultural Machinery, Faculty of Horticulture, Mendel University in Brno, Valticka 337, 691 44 Lednice, Czech Republic
Correspondence  David O. Obada ,Email: doobada@abu.edu.ng
Received: January 22, 2022; Revised: August 14, 2022   Accepted: September 12, 2022.  Published online: November 8, 2022.
ABSTRACT
In this study, porous kaolin-based ceramic support materials were successfully fabricated using conventional sintering techniques. The support materials were prepared using two different weight per cent (wt.%) of sawdust addition (10–20 wt.%), compacted at 10–20 MPa and sintered at 900 and 1000 °C. The physical and mechanical properties of the support materials as formed by sintering were examined, while the failure rate of the fabricated support materials was determined using Weibull statistical tool. The experimental data show that the best result for the hardness and fracture toughness was obtained as 0.409 GPa and 0.835 MPa·m1/2 for supports sintered at 1000 °C with 20 wt. % pore formers. The mass loss for the support materials with the best properties was reported to be about 5%, making the support a potential material for use as catalyst support. The Weibull modulus (m) obtained for the ceramic support was in a range of 2.75–4.00, indicating that the samples had a lower failure rate than most ceramic support materials with a Weibull modulus of more than 6. The control samples and samples with the inclusion of pore formers demonstrated acoustic emission (AE) response during the entire cooling process during the acoustic emission test.
Key words: Mechanical properties · Acoustic emission · Wear · Weibull · Porosity
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