Research trend in the development of macroporous ceramic components by pore forming additives from natural organic matters: A short review

Dele‐Afolabi, T.T.; Hanim, M.A. Azmah; Mazlan, Norkhairunnisa; Sobri, Shafreeza; Calin, R.

doi:10.1016/j.ceramint.2016.10.177

Cited by 65 publications

(24 citation statements)

References 96 publications

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“…It was observed that samples of porous alumina produced with different particles sizes and quantities of rice husk had a similar pore diameter frequency. In the compositions with rice husk, the pore frequency was concentrated in the size range of 0.18 to 0.19 μm, whereas the pure alumina composition presented lower frequency and also a narrower range of pore diameter values, when compared to other works and other ways of obtaining alumina ceramics [1,2,5]. The amount of rice husk used affected the number of pores that have a certain diameter.…”

Section: Resultsmentioning

confidence: 83%

“…After pressing, the samples were fired for 1 h at 200, 300, 500 and 1450 °C. These firing levels were based on the thermogravimetric analysis of the rice husk [2,5] and also on preliminary tests, since the burning of the organic matter of the rice husk happens gradually until 200 °C and then more slowly until approximately 500 °C. The sintering temperature of 1450 °C was based on the phase diagram Al 2 O 3 -SiO 2 [2].…”

Section: Methodsmentioning

confidence: 99%

“…Porous ceramics can be produced by mixing porogenic agents in the ceramic matrix, which, during sintering, burn out forming the pores [2]. Some examples of materials used as porogenic elements are starches, polymers, wood and polymer foams [3][4][5]. Fig.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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The objective of this work was to evaluate the mechanical properties of porous alumina ceramics, using the rice husk as a porogenic element. The rice husk was milled and graded in two granulometry, <65 μm and 65-150 μm, and added in a high purity calcined alumina in the proportion of 5, 15 and 30 wt%. The samples were pressed by uniaxial pressing and sintered at 1450 ºC for 1 h. Sintered density, total porosity, Young's modulus, modulus of rupture, and compressive strength were evaluated. Samples were also prepared without the addition of rice husk (RH) in order to compare the properties. Porous ceramics with total porosity ranging from 24% to 54% were produced, and with the composition of 5% RH 65-150 μm, a high porosity value was obtained for a lower loss in mechanical properties.

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Section: Resultsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

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

et al. 2019

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“…Emulsion templating method is a strategy that the dispersed phase droplets of emulsion are used to create pores in a solid material by polymerization of the continuous phase [10,11]. It has been used for the preparation of porous polymers and inorganic ceramic materials for a wide variety of applications [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of emulsifiers on the pore structures of geopolymer prepared by emulsion templating

Wang

2020

Mater. Res. Express

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The metakaolin-based porous geopolymer were prepared by emulsion templating method with sunflower oil as the template agent. The effects of the type of emulsifiers with different ionic properties, including sodium stearate (SS), polyacrylamide (PAM), and cetyltrimethylammonium bromide (CTAB), which are respectively belonging to anionic, nonionic and cationic emulsifiers, on the paste viscosity, mechanical strength and pore structure of geopolymer were studied. Fourier transform infrared spectroscopy (FTIR) was used to characterize the influence of emulsion template on the geopolymerization. Scanning electron microscope (SEM) and Image-Pro Plus (IPP) software were used to examine the pore structure of geopolymers, including pore size distribution, average size and roundness of pores. Results indicate that geopolymerization is not significantly affected by the incorporation of emulsion template, while the average size, shape and connectivity of pores in geopolymer were significantly influenced by the type of emulsifiers. With the addition of SS, PAM, and CTAB, the average pore size were 18.1, 27.4, and 11.7 μm, respectively, while the control is 18.9 μm. Both the shape regularity and open porosity of pores were increased with SS and PAM, while no significant changes with CTAB. It is promising to make geopolymer with controllable macro pore structure by adjusting the types of emulsifiers in emulsion templating method by adjusting the oilwater interfacial tension and the particle dispersion.

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“…Among the different fabrication routes available, attention has been centered on the pore‐forming agent (PFA) route wherein, decently controlled pores can be infused into ceramic matrices through the concurrent addition and elimination of pore formers during the heat‐treatment process . Although a wide variety of pore formers has been proposed and employed in shaping porous ceramic systems, the natural organic matters, in particular starches have in the last few years gained remarkable acceptance . This is obviously due to their recent application in combining both pore‐forming and body‐forming functions while employing the starch consolidation casting as the fabrication route.…”

Section: Introductionmentioning

confidence: 99%

Effect of agro‐waste pore formers on the microstructure, hardness, and tensile properties of porous alumina ceramics

Dele‐Afolabi

Ariff

Mazlan

et al. 2018

Int J Applied Ceramic Tech

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This study demonstrates a simple and economically viable approach to fabricate porous alumina ceramics shaped with low-priced natural organic pore-forming agents (PFAs) from rice husk (RH) and sugarcane bagasse (SCB) of various weight contents using the powder metallurgy method. Experimental findings revealed that the total porosity (44-67vol%) and average pore size (70-178 lm) maintained a linear relationship with rising PFA inclusion. Using the diametral compression test, the mechanical response of porous alumina samples was evaluated as a function of porosity and pore geometry. From the overall mechanical strength characterization, the susceptivity of strength on porosity became well marked as the agro-waste shaped porous ceramics exhibited hardness, tensile strength, and elastic modulus of 529.1-26HV, 20.4-1.5MPa and 1662-57MPa, respectively. Moreover, the fractography of the RH and SCB graded porous alumina samples was evaluated as a function of the respective microstructural features. With a plausible tradeoff between pore interconnectivity and mechanical strength, recommended areas of application include solid oxide fuel cells (SOFCs) design, filtration, and thermal insulation systems. K E Y W O R D S agro-waste PFA, hardness, porosity, porous alumina, tensile strength

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Research trend in the development of macroporous ceramic components by pore forming additives from natural organic matters: A short review

Cited by 65 publications

References 96 publications

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

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

Study on the effect of emulsifiers on the pore structures of geopolymer prepared by emulsion templating

Effect of agro‐waste pore formers on the microstructure, hardness, and tensile properties of porous alumina ceramics

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