Production of fire clay porous structure with no aligned macro porosity from water-based slurry by freeze casting process: A new approach

Cilla, Marcelo S.; Cartaxo, Juliana de Melo; Menezes, Romualdo Rodrigues; Santana, Lisiane Navarro de Lima; Neves, G. A.

doi:10.1016/j.ceramint.2016.02.053

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…Water is generally used as the main solvent for various reasons, such as the convenience of use, environmental aspects, unique ice crystal morphologies that lead to unique porosities and compatibility with functional additives [56]. In water's particular case, the microstructure resulted after sublimation is lamellar, with lamellar channels between the ceramic walls [69]. However, due to its anisotropy, the lamellar structure of ice may have undesirable properties for some applications.…”

Section: Solvent Typementioning

confidence: 99%

“…They showed that the prior gelation of the suspension completely alters the pore morphology of the manufactured pieces. Cilla et al [69] also studied how the use of gelatin influences the morphology of the pores without prior gelation. The authors argued that firstly the formation of micelles occurs when the critical micellar concentration (CMC) is achieved.…”

Section: Additivesmentioning

confidence: 99%

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Freeze-casting applied to ceramic materials: a short review of the influence of processing parameters

et al. 2021

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In recent years there is a high interest in the freeze-casting process because it is a simple, economical, and environmentally friendly method for obtaining highly porous materials. Most of the materials obtained by this technique have directional pore structure and anisotropic properties. However, a wide range of pore size and morphology can be obtained by the control of processing parameters, such as solvent type, solids concentration, particle size, freezing rate, and types of additives. The varied morphologies permit the application of freeze-casted materials in various technological applications. However, despite the high amount of studies about freeze-casting of ceramic materials in the last years, review articles addressing the influence of processing parameters on the pore characteristics of obtained ceramics are still scanty. Therefore, this review addresses the influence of freeze-casting process parameters on the pore characteristics of the ceramic materials.

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Section: Solvent Typementioning

confidence: 99%

Section: Additivesmentioning

confidence: 99%

Freeze-casting applied to ceramic materials: a short review of the influence of processing parameters

et al. 2021

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“…Geopolymers have found application in virtually all fields of industry, providing high mechanical strength, high chemical inertness, and excellent fire resistance. They are considered a replacement for conventional cement-based components as well as for ceramic parts that can be used in medium–high temperatures typically below 1200 °C [ 5 , 6 ]. Geopolymers are produced by a geosynthesis process involving natural or synthetic aluminosilicates in which amorphous silicon and aluminum oxide react in a strongly basic medium to form networks which are chemically and structurally like natural rock [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Self-Fluxing Mechanism in Geopolymerization for Low-Sintering Temperature of Ceramic

et al. 2021

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Kaolin, theoretically known as having low reactivity during geopolymerization, was used as a source of aluminosilicate materials in this study. Due to this concern, it is challenging to directly produce kaolin geopolymers without pre-treatment. The addition of ground granulated blast furnace slag (GGBS) accelerated the geopolymerization process. Kaolin–GGBS geopolymer ceramic was prepared at a low sintering temperature due to the reaction of the chemical composition during the initial stage of geopolymerization. The objective of this work was to study the influence of the chemical composition towards sintering temperature of sintered kaolin–GGBS geopolymer. Kaolin–GGBS geopolymer was prepared with a ratio of solid to liquid 2:1 and cured at 60 °C for 14 days. The cured geopolymer was sintered at different temperatures: 800, 900, 1000, and 1100 °C. Sintering at 900 °C resulted in the highest compressive strength due to the formation of densified microstructure, while higher sintering temperature led to the formation of interconnected pores. The difference in the X-ray absorption near edge structure (XANES) spectra was related to the phases obtained from the X-ray diffraction analysis, such as akermanite and anothite. Thermal analysis indicated the stability of sintered kaolin–GGBS geopolymer when exposed to 1100 °C, proving that kaolin can be directly used without heat treatment in geopolymers. The geopolymerization process facilitates the stability of cured samples when directly sintered, as well as plays a significant role as a self-fluxing agent to reduce the sintering temperature when producing sintered kaolin–GGBS geopolymers.

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“…According to strict environmental regulatory restrictions, landfill disposal or incineration have been prohibited in developing countries because of rapid industrial growth and the concomitant rapid increase in the amount of waste material generated (Lee et al , 2000; Lu et al , 2018, 2019). In order to minimize the large amount of disposed SBC and its pollution risk, the conversion and reuse of this waste material has recently attracted considerable interest (Mana et al , 2008, 2011; Wambu et al , 2009; Sakizci et al , 2010; Li et al , 2011; DíazGómez-Treviño et al , 2013; Cilla et al , 2016). Two main methods have been employed for the regeneration of SBC, namely: (1) calcination or burning (Tsai et al , 2002); and (2) washing and solvent extraction (Mana et al , 2007; Boey et al , 2011; Hussin et al , 2011; Morrow et al , 2013; Unuabonah et al , 2013; Wang et al , 2013).…”

mentioning

confidence: 99%

Regeneration of spent bleaching clay by ultrasonic irradiation and its application in methylene blue adsorption

Liang

Yang

et al. 2020

Clay miner.

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An effective method that combines solvent extraction with ultrasonic irradiation was developed to recycle spent bleaching clay (SBC) from modern oil refinery plants. The principle of ‘waste to treasure’ was used to achieve the regenerated SBC. Various characterization techniques were applied to analyse and compare regenerated SBC and commercial bleaching clay (CBC). The structure of the regenerated SBC did not show any obvious change compared with that of CBC, but the Brunauer–Emmett–Teller-specific surface area (SBET) and pore-volume values of the regenerated SBC increased. At the same time, the parameters of the regenerated SBC reached national standards. In addition, the samples were used as low-cost adsorbents for the adsorption of methylene blue (MB) from water. The regenerated SBC had greater adsorption efficiency and cycle performance for MB than CBC. Hence, the SBC may be treated by ultrasonic radiation combined with extraction, and the regenerated SBC has better properties than CBC. This work opens up a new approach to the regeneration and utilization of SBC and raises the potential of ultrasonic irradiation as an environmentally friendly method to be applied to various regeneration systems.

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Production of fire clay porous structure with no aligned macro porosity from water-based slurry by freeze casting process: A new approach

Cited by 13 publications

References 16 publications

Freeze-casting applied to ceramic materials: a short review of the influence of processing parameters

Freeze-casting applied to ceramic materials: a short review of the influence of processing parameters

Self-Fluxing Mechanism in Geopolymerization for Low-Sintering Temperature of Ceramic

Regeneration of spent bleaching clay by ultrasonic irradiation and its application in methylene blue adsorption

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