Processing of particle stabilized Al2TiO5–ZrTiO4 foam to porous ceramics

Sarkar, Naboneeta; Park, Jung Gyu; Mazumder, Sangram; Aneziris, Christos G.; Kim, Ik Jin

doi:10.1016/j.jeurceramsoc.2015.07.004

Cited by 25 publications

(15 citation statements)

References 27 publications

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“…The energy of attachment or free energy gained (G) by the adsorption of a particle at the interface can be calculated by Equation 2, where γ represents gas-liquid interfacial energy, θ is contact angle, and r is particle size. 23,24 From Equation 2, larger particles bring greater attachment energy. The length of the mullite whiskers used in this paper was about 60 μm which was much larger than other particles.…”

Section: Characterizationmentioning

confidence: 99%

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

et al. 2020

Int J Applied Ceramic Tech

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Porous anorthite/mullite whiskers ceramics with high porosity (>91%) and high strength (>0.45 MPa) have been successfully prepared by foam gel‐casting method. Effects of extra mullite whiskers on properties including thermal conductivity and compressive strength at different temperatures were investigated and discussed in terms of microstructure observed through SEM and TEM. The results showed that the addition of extra mullite whiskers in certain content could effectively reduce thermal conductivity, improve the compressive strength both at room and high temperature at same time. When the mullite whiskers content was 20 mol%, the porosity was as high as 91.6 ± 0.19%, the thermal conductivity was low to 0.034 ± 0.003 W/(m·K), and the compressive strength at 1000°C was high to 0.64 ± 0.11 MPa three times to the pure one. Small pores, small grains, and more phase interface or grain boundary caused by the addition of extra mullite whiskers were the main factors for low thermal conductivity. Meanwhile, small pores, closely bonded small grains, and the stable three‐dimension network formed by mullite whiskers helped to improve strength.

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Section: Characterizationmentioning

confidence: 99%

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

et al. 2020

Int J Applied Ceramic Tech

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“…This moderately high energy, which is associated with irreversible adsorption of the particles at the air-water interface, leads to the outstanding stability (within the range of 70% to 83%) that is exhibited by the particle-stabilized wet foams. In the case of the surfactant-stabilized wet foam, the adsorption free energy values of the surfactant molecules range within a few joules, thereby limiting the foam stability; 2,8,15,18) moreover, the wet-foam stability of the ceramic foam is > 83%, and this proves that the addition of PMMA beads at levels up to 20 wt% moderately increases the stability of the wet foams. Figure 5 shows the air content of the suspension and the porosity of the sintered sample as a function of the bead content.…”

Section: Direct Foaming Drying Sintering and Analysismentioning

confidence: 97%

Highly-closed/-Open Porous Ceramics with Micro-Beads by Direct Foaming

Jang

Seo

Park

et al. 2016

J. Korean Ceram. Soc

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This study reports on wet-foam stability with respect to porous ceramics from a particle-stabilized colloidal suspension that is achieved through the addition of polymethyl methacrylate (PMMA) using a wet process. To stabilize the wet foam, an initial colloidal suspension of Al 2 O 3 was partially hydrophobized by the surfactant propyl gallate (2 wt.%) and SiO 2 was added as a stabilizer. The influence of the PMMA content on the bubble size, pore size, and pore distribution in terms of the contact angle, surface tension, adsorption free energy, and Laplace pressure are described in this paper. The results show a wet-foam stability of more than 83%, which corresponds to a particle free energy of 2.7 × 10 −12 J and a pressure difference of 61.1 mPa for colloidal particles with 20 wt.% of PMMA beads. It was possible to control the uniform distribution of the open/closed pores by increasing the PMMA content and by adding thick struts, leading to the achievement of a higher-stability wet foam for use in porous ceramics.

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“…1(a), respectively. 20,68,69) In this review, the direct foaming technique is taken as the main processing technique, which can be used for the fabrication of porous ceramics with tailored microstructure, where pores are introduced into the colloidal suspension by the mechanical frothing process of the general mixture. These simple yet versatile approaches give rise to porous ceramics with unique microstructural features that control the properties and functions of the ceramic materials.…”

Section: Processing Routes To Porous Ceramicsmentioning

confidence: 99%

“…Furthermore, each fabrication method was best suited for producing a specific range of cell sizes, cell size distribution, and the overall amount of porosity, as well as for influencing the level of interconnectivity among the cells, amount, thickness, and orientation of the cell walls. 4,11,20,[90][91][92][93][94] In this review, the direct foaming technique relies on the use of surfactants or particles to stabilize a foam generated by mechanical frothing or bubbling of a gas through a suspension. Direct foaming produces porous materials by the incorporation of air into a suspension or liquid medium.…”

Section: Direct Foaming Processmentioning

confidence: 99%

“…115) Stable colloidal suspensions are widely employed in wet ceramic forming techniques, including slip casting, tape casting, pressure casting, centrifugal casting, and direct foaming process. 2,20) In those foaming techniques, the colloidal processing is an important tool in achieving the stable suspension involving the dispersion of particles that influences the succeeding forming steps. Furthermore, slurries or suspensions are effectively dispersed by electrosteric stabilization mechanisms to allow the dispersion of particles at high solid loading with minimum viscosity.…”

Section: Zeta Potentialmentioning

confidence: 99%

See 1 more Smart Citation

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

Kim¹,

Park²,

Han³

et al. 2019

J. Korean Ceram. Soc

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Porous ceramics are promising materials for a number of functional and structural applications that include thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. These applications take advantage of the special characteristics of porous ceramics, such as low thermal mass, low thermal conductivity, high surface area, controlled permeability, and low density. In this review, we emphasize the direct foaming method, a simple and versatile approach that allows the fabrication of porous ceramics with tailored microstructure, along with distinctive properties. The wet foam stability is achieved under the controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening and Ostwald ripening upon drying and sintering. Different components, like contact angle, adsorption free energy, air content, bubble size, and Laplace pressure, play vital roles in the stabilization of the particle stabilized wet foam to the porous ceramics. The mechanical behavior of the load-displacements curves of sintered samples was investigated using Herzian indentations testes. From the collected results, we found that microporous structures with pore sizes from 30 µm to 570 µm and the porosity within the range from 70% to 85%.

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Processing of particle stabilized Al2TiO5–ZrTiO4 foam to porous ceramics

Cited by 25 publications

References 27 publications

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

Highly-closed/-Open Porous Ceramics with Micro-Beads by Direct Foaming

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

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