Effect of dispersion viscosity on microstructure of cordierite foam prepared by thermo-foaming

Li, Xin; Li, Yuanbing; Xiang, Ruofei; Li, Shujing; Li, Xuesong; Zhou, Qirun

doi:10.1016/j.ceramint.2019.08.174

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…The error made on this percentage is about 5%-10%.The mineral phase shape fabrication. The sintering linear shrinkage in other methods is greater than 10%, [37][38][39] but the total shrinkage is below 2% by adjusting gelatin concentration and solid content in this work. Second, compared with the bulk density of samples prepared by all other methods, porous cordierite with low bulk density (0.23 g/cm 3 ) can be obtained by this method, which shows a strong advantage in the preparation of light porous ceramics.…”

Section: Methods Of Characterizationmentioning

confidence: 74%

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Lǐ

et al. 2021

Int J Applied Ceramic Tech

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It is well known that ceramic products are hard-tomachine due to their high strength and high hardness. Although the post-processing and fine processing of ceramics are technically feasible, the process is expensive and time consuming. In addition, cracks will inevitably be introduced during machining, resulting in properties reduction and ceramic products damage. 1 Therefore, it is particularly important to ensure the size and accuracy of ceramic product during preparation. Especially for porous ceramics, the shrinkage during preparation is even more difficult to avoid. [2][3][4] Therefore, the development of low-shrinkage porous ceramic preparation technology has attracted extensive attention. [5][6][7] Recently, porous cordierite ceramics with high porosity have been prepared and the sintering linear shrinkage was controlled below 2% through an in situ synthesis foam gel-casting method in our previous studies. 8,9 The near net size sintering was achieved by means of the compensation for sintering shrinkage through the volume expansion derived from phase transition and synthesis reaction. But the whole near net shape fabrication has not been achieved due to the large drying shrinkage before sintering. Large uneven drying shrinkage usually brings internal stress and microcracks, 10 which will not only cause difficulties

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Section: Methods Of Characterizationmentioning

confidence: 74%

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Lǐ

et al. 2021

Int J Applied Ceramic Tech

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“…On the other hand, lyophilic systems may reach very high values of viscosity. With these types of colloids, a parabolic, rather than linear, relationship exists between viscosity and the concentration of the dispersed phase (Li et al, 2019). Many colloidal systems, especially lyophilic (gel) systems, exhibit the property of elasticity (Bormashenko et al, 2015).…”

Section: Characteristics Of Colloids In Wastewatermentioning

confidence: 99%

Role of coagulation/flocculation as a pretreatment option to reduce colloidal/bio-colloidal fouling in tertiary filtration of textile wastewater: A review and future outlooks

Aragaw

Bogale

2023

Front. Environ. Sci.

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Textile industry wastewater has become a growing concern in recent years due to it has been characterized by a high load of organic dyes, suspended and dissolved solids, alkaline pH, and low biodegradability. As a result, environmental authorities necessitate textile industries to treat effluents before discharge into the environment. Tertiary filters, particularly membrane filtrations, are the most preferable process to recover good-quality water at the tertiary treatment phase, which feeds from secondary effluents, in wastewater treatment processes. However, fouling is still a challenge due to a higher load of suspended solids, colloids, organic matter, and a high level of bio-colloids (mostly from secondary effluents) in the textile wastewater treatment process. Bio-colloids are any colloidal entities of organic matter including microorganisms and their exudates. Hence, a coagulation/flocculation unit process, as a pretreatment option, is critical both at the primary treatment stage and after secondary (biological) effluents to prevent fouling problems at the tertiary filters. We reviewed identifying major foulants causing tertiary filter damage and the available pretreatment option for the removal of these foulants. We focus on and suggest the coagulation/flocculation process as a good pretreatment alternative to prevent filter fouling as it provides a reliable process to treat high water turbidity that arises from a high load of solids and colloids. Amongst different types of foulants, we focus on and present the colloidal solids and bio-colloidal foulants that could be major causes of fouling. These foulants are less understood and expected to be dominant in the textile industry wastewater, and established pretreatment alternatives are not well developed for the bio-foulants fed from the secondary effluent. Thus, these foulants need to be critically identified in the textile wastewater treatment plants to integrate suitable pretreatment options to prevent fouling potentiality. We proposed a coagulation/flocculation unit process as a pretreatment option to reduce colloidal and bio-colloidal fouling before the tertiary treatment stage, next to the secondary effluent, is critical.

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“…Cordierite ceramics have wide applications, including high‐temperature thermal storage, 9 filtration, 10 thermal insulation, 11 automotive, 12 and packaging 13 . They can be produced using conventional solid‐state reaction, 14–17 coprecipitation, 18 sol–gel, 19 hydrothermal treatment, 20 and thermo‐foaming methods 21 . Mullite (3Al 2 O 3 •2SiO 2 ) is a key ingredient in the production of cordierite‐based composites that may contain complex microstructures when different phases are formed with mismatched thermal expansion 22 …”

Section: Introductionmentioning

confidence: 99%

“…13 They can be produced using conventional solid-state reaction, [14][15][16][17] coprecipitation, 18 sol-gel, 19 hydrothermal treatment, 20 and thermo-foaming methods. 21 Mullite (3Al 2 O 3 •2SiO 2 ) is a key ingredient in the production of cordierite-based composites that may contain complex microstructures when different phases are formed with mismatched thermal expansion. 22 Mullite has a significantly higher melting point, ranging between 1810 and 1830 • C, and can be considered a promising candidate for porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

Sintering and characterization of in situ formed porous cordierite ceramics with nano boehmite additions

Mansour

Wahsh

Othman

2023

Int J Applied Ceramic Tech

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In this study, we investigated the effect of sintering temperature and nano boehmite additions on the phase composition, densification, and mechanical properties of porous cordierite ceramics. Ceramic samples were sintered at temperatures ranging from 1200 to 1400 • C. Carbon powder was used as a pore forming agent to improve the porosity of the ceramic structure. Nano boehmite and carbon additions significantly enhanced ceramic porosity and average pore size in sintered samples. The bulk density and apparent porosity of the sintered samples were found to be 0.96-1.53 g/cm 3 and 42.3%-65.6%, respectively. Sintered samples had cold crushing strengths of 1.5-14.3 MPa. The microstructure obtained by scanning electron microscopy was used to measure average pore size in sintered samples and was found to be 41.93 µm for stoichiometric composition (SC), 67.72 µm for SC and nano boehmite, and 102.98 µm for SC, nano boehmite, and carbon. The microstructure of the sintered samples revealed that the crystallinity of the in situ formed phases increased with the increase in nano boehmite additions.

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Effect of dispersion viscosity on microstructure of cordierite foam prepared by thermo-foaming

Cited by 16 publications

References 17 publications

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Role of coagulation/flocculation as a pretreatment option to reduce colloidal/bio-colloidal fouling in tertiary filtration of textile wastewater: A review and future outlooks

Sintering and characterization of in situ formed porous cordierite ceramics with nano boehmite additions

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