Foam-gelcasting preparation, microstructure and thermal insulation performance of porous diatomite ceramics with hierarchical pore structures

Han, Lei; Li, Faliang; Deng, Xiangong; Wang, Junkai; Zhang, Haijun; Zhang, Shaowei

doi:10.1016/j.jeurceramsoc.2017.02.032

Cited by 130 publications

(52 citation statements)

References 34 publications

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“…In recent years, porous ceramics have attracted more attention due to their low density, low thermal conductivity, high porosity, high specific area, and good thermal shock resistance . They have been utilized to produce separation membranes, thermal insulation systems, catalyst supports, implantable bioceramics, and other uses. In particular, porous alumina ceramics—as one of the most popular oxide ceramics—have been used for a wide range of applications, including: separation materials, membranes, and implantable bioceramics .…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous Al₂O₃ ceramics by starch consolidation casting method

Chen

Cui

et al. 2018

Int J Applied Ceramic Tech

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Porous alumina ceramics were fabricated by starch consolidation casting using corn starch as a curing agent while their microstructure, mechanical properties, pore size distribution, and corrosion resistance were examined. Results showed that the porous alumina ceramics with the flexural strength of about 44.31MPa, apparent porosity of about 47.67% and pore size distribution in the range of 1‐4 μm could be obtained with 3wt% SiO2 and 3wt% MgO additives. Corrosion resistance results showed mass losses: hot H2SO4 solution and NaOH solution for 10 hours were 0.77% and 2.19%, which showed that these porous alumina ceramics may offer better corrosion resistance in acidic conditions.

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Section: Introductionmentioning

confidence: 99%

Preparation of porous Al₂O₃ ceramics by starch consolidation casting method

Chen

Cui

et al. 2018

Int J Applied Ceramic Tech

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“…The decrease in density caused by the loss of mass due to the increase in dolomite could actually decrease the bending strength of ceramics . Moreover, the increased dolomite concentration affected the formation of sintering necks, which was beneficial in the improvement of bending strength of ceramics . Previous literature also stated that with the increase of the relative diameter of sintering neck, strength of the material is constantly increased…”

Section: Resultsmentioning

confidence: 98%

“…Porous ceramics, especially with those high open porosity, are widely used in filtration, catalyst support, thermal insulation, and among other fields . Formation of high open porous ceramics with simple and low cost is attracting extensive research attention .…”

Section: Introductionmentioning

confidence: 99%

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Zhang

Jiang

et al. 2019

ChemistrySelect

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Porous ceramics with high open porosity and good mechanical properties were successfully prepared from fly ash rich in CaO. An addition of 30–50wt.% dolomite decreased the average pore diameter from ∼11.79 μm to ∼2.82μm due to the decrease of viscosity with high dolomite addition, while there is an increase in open porosity from 48.63% to 53.23%. SEM results suggested that pores were firstly surrounded by glassy phase. With the addition of more than 30 wt.% of dolomite, pores were covered by loose structure. XRD results showed the changes in crystal phases of sintered ceramics, from anorthite sodian to alkaline basalt and then to calcium magnesium silicate. CaO and MgO from decomposed dolomite were proposed to be the main reason on modification closed pores to open ones. Except this, CO2 emission and crystalline water emission during sintering were also contributed to the formation of open pores in porous ceramics.

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“…Samples for SEM examinations were coated with platinum, and those for TEM observations were prepared by ultrasonic dispersion of sample powders in acetone for 20 minutes followed by dropping onto a holey copper film (2000 mesh) using micropipette and subsequent drying. Apparent porosity, bulk density, and compressive strength of foams are characterized according to the previous method . Pore size distributions of alumina foams were evaluated by a mercury intrusion porosimeter (AutoPore IV 9510; Micromeritics, Norcross, GA, USA).…”

Section: Methodsmentioning

confidence: 99%

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

et al. 2019

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Ceramic foams with extensive interconnected pores have great application potential in high‐temperature particulate matter (PM) capture. Considering that there are still challenges to synthesize ceramic foams with efficient filtration, a novel hierarchical‐structured alumina foam with three‐dimensional (3D) reticular architecture has been fabricated via combining chemical grafting pore‐forming agent and polyurethane (PU) foaming technology. Carbon black is grafted with carbamate functional groups in order to enable a better dispersion in highly viscous PU. Submicrometer and micrometer‐sized pores on the cell walls are observed in hierarchical‐structured ceramic foams. The resulting alumina foam exhibits 95.2% removal efficiency for PM particles and low pressure drop of only 50 Pa when grafted carbon black content is 3 wt%. This filtration performance is much higher than that of existing ceramic materials. These features, combined with our experimental design strategy, provide a new insight to design high‐temperature PM filtration materials with durable high performance.

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Foam-gelcasting preparation, microstructure and thermal insulation performance of porous diatomite ceramics with hierarchical pore structures

Cited by 130 publications

References 34 publications

Preparation of porous Al₂O₃ ceramics by starch consolidation casting method

Preparation of porous Al₂O₃ ceramics by starch consolidation casting method

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

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Foam-gelcasting preparation, microstructure and thermal insulation performance of porous diatomite ceramics with hierarchical pore structures

Cited by 130 publications

References 34 publications

Preparation of porous Al2O3 ceramics by starch consolidation casting method

Preparation of porous Al2O3 ceramics by starch consolidation casting method

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

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Preparation of porous Al₂O₃ ceramics by starch consolidation casting method

Preparation of porous Al₂O₃ ceramics by starch consolidation casting method