Mechanical and thermal properties of highly porous Al 2 TiO 5 –Mullite ceramics

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

doi:10.1016/j.ceramint.2015.11.002

Cited by 38 publications

(15 citation statements)

References 15 publications

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“…The low adsorption free energy resulted from spontaneous bubble growth leads to foam instability [16]. The investigated samples exhibit a much higher adsorption free energy of approximately 5.8×10 8 to 7.5×10 8 J at the interface, resulting in an irreversible adsorption of the particles at the air-water interface that leads to an outstanding stability of up to 87%.…”

Section: Resultsmentioning

confidence: 99%

“…Alternatively, the ZrTiO 4 grains are generally irregular to round in shape. The abundance of the dispersed grain-boundary microcracks may be attributed to the anisotropic thermal expansion behavior of both the Al 2 TiO 5 grains and the ZrO 2 phase [16]. The synergism of the low thermal expansion anisotropy of both the titanates ( 251350 ℃ of ZrTiO 4 ≈ 8.29×10 6 K 1 ) [5,34] generates the microcracking system throughout the dominated Al 2 TiO 5 -ZrTiO 4 phase in the samples of the ATZS1, ATZS2, and ATZS3 composites.…”

Section: Resultsmentioning

confidence: 99%

“…However, the enhancement of thermal durability of Al 2 TiO 5 can be possible by adding thermodynamical stabilizers such as MgO, Fe 2 O 3 , and TiO 2 , which are isomorphous with pseudo-brookite minerals like Fe 2 TiO 5 [9], MgTi 2 O 5 [10], Ti 3 O 5 (anosovite) [11], and MgAl 2 O 4 (spinel) [12]. Also, Al 2 TiO 5 can be mechanically stabilized through the limitation of its grain growth with additives such as SiO 2 [13], ZrO 2 [14], ZrTiO 4 [15], mullite [16], and ZrSiO 4 (zircon) [17] that constrain both the microcracks and the abnormal grain growth [18].…”

Section: Introductionmentioning

confidence: 99%

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Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

et al. 2017

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Abstract:The porous ceramics based on Al 2 O 3 -TiO 2 /ZrO 2 -SiO 2 from particle-stabilized wet foam by direct foaming were discussed. The initial Al 2 O 3 -TiO 2 suspension was prepared by adding TiO 2 suspension to partially hydrophobized colloidal Al 2 O 3 suspension with equimolar amount, to form Al 2 TiO 5 on sintering. The secondary ZrO 2 -SiO 2 suspension was prepared using the equimolar composition, and to obtain ZrSiO 4 , ZrTiO 4 , and mullite phases in the sintered samples, the secondary suspension was blended into the initial suspension at 0, 10, 20, 30, and 50 vol%. The wet foam exhibited an air content up to 87%, Laplace pressure from 1.38 to 2.23 mPa, and higher adsorption free energy at the interface of approximately 5.8×10 8 to 7.5×10 8 J resulting an outstanding foam stability of 87%. The final suspension was foamed, and the wet foam was sintered from 1400 to 1600 ℃ for 1 h. The porous ceramics with pore size from 150 to 400 μm on average were obtained. The phase identification was accomplished using X-ray diffraction (XRD), differential thermal analysis (DTA), and thermogravimetric analysis (TGA), and microstructural analysis was performed using field emission scanning electron microscopy (FESEM).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

et al. 2017

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“…Incorporating FA enhanced the crush strength of hydrophobic FA/E100‐S_(20/80)_PVC 62 and FA/TEPA‐S_(30/70)_PVC 62 pellets by factors of 1.9 and 3.1, respectively, compared to pellets with no FA. This strength improvement was due to interlocking of the larger BIAS particles by smaller FA particles, which contain reportedly strong quartz and mullite minerals . The FA and BIAS particles were bonded together by the strongest of all tested binders, PVC, via hydrogen‐bonding interactions between PVC‐Cl groups and both the FA and silica surface −OH groups and the BIAS amine groups.…”

Section: Figurementioning

confidence: 99%

Robust Immobilized Amine CO₂ Sorbent Pellets Utilizing a Poly(Chloroprene) Polymer Binder and Fly Ash Additive

et al. 2016

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Pelletization of ca. 50 wt % amine/silica carbon dioxide sorbents was achieved with the novel combination of fly ash (FA) as a strength additive and hydrophobic poly(chloroprene) (PC) as a binder. The PC content and overall synthesis procedure of these materials were optimized to produce pellets, labeled as FA/E100‐S_(20/80)_12.2, with the highest ball‐mill attrition resistance (<0.5 wt % by fines, 24 h) and maximum CO2 capture capacity of 1.78 mmol CO2 g−1. The strength of the pellets was attributed to hydrogen‐bonding of the relatively homogeneous PC network with the interlocked FA and BIAS particles (DRIFTS, SEM‐EDS). The low degradation of 3–4 % in the pellet's CO2 capture capacity under both dry TGA (7.5 h) and practical fixed‐bed (6.5 h dry; 4.5 h humid,≈5 vol % H2O) CO2 adsorption–desorption conditions highlights the pellet's excellent cyclic stability. These robust pellet characteristics make PC/FA/sorbent materials promising for commercial scale, point‐source CO2 capture.

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“…2,4,95,96) The coated hydrophobic particles irreversibly adsorb to the air-water interface, thus stabilizing it. 4,97,98) These wet foams can remain stable for several days, and show no bubble coarsening, drainage, coalescence, or Ostwald ripening. The short-chain amphiphiles modify in situ the wetting behavior of the particle surfaces, as in a Pickering emulsion.…”

Section: Direct Foaming Processmentioning

confidence: 99%

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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Mechanical and thermal properties of highly porous Al 2 TiO 5 –Mullite ceramics

Cited by 38 publications

References 15 publications

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

Robust Immobilized Amine CO₂ Sorbent Pellets Utilizing a Poly(Chloroprene) Polymer Binder and Fly Ash Additive

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

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Mechanical and thermal properties of highly porous Al 2 TiO 5 –Mullite ceramics

Cited by 38 publications

References 15 publications

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

Al2O3–TiO2/ZrO2–SiO2 based porous ceramics from particle-stabilized wet foam

Robust Immobilized Amine CO2 Sorbent Pellets Utilizing a Poly(Chloroprene) Polymer Binder and Fly Ash Additive

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

Contact Info

Product

Resources

About

Robust Immobilized Amine CO₂ Sorbent Pellets Utilizing a Poly(Chloroprene) Polymer Binder and Fly Ash Additive