Effect of nano-alumina sol on the sintering properties and microstructure of microporous corundum

Fu, Lvping; Huang, Ao; Gu, Huazhi; Lu, Denghui; Lian, Pengfei

doi:10.1016/j.matdes.2015.09.132

Cited by 42 publications

(17 citation statements)

References 26 publications

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“…The secondary nanopores may derive from the union of adjacent grains to form irregular shape and the accumulation of such grains to produce vacancy. At elevated temperatures, these secondary nanopores are partly transformed into intragranular ones due to rapid grain growth . It is worth noting that the secondary pores of α‐alumina sintered at 1200°C are mesopores, which may contribute to the applications in filtration.…”

Section: Resultsmentioning

confidence: 99%

“…At elevated temperatures, these secondary nanopores are partly transformed into intragranular ones due to rapid grain growth. 29 It is worth noting that the secondary pores of α-alumina sintered at 1200°C are mesopores, which may contribute to the applications in filtration. The porosity, compressive strength, and sintering shrinkage of α-alumina as a function of sintering temperature are shown in Figure 8A, which indicates that the increase of sintering temperature leads to larger shrinkage (20.4%-26.9%), thus attaining lower porosity (from 83.1% to 76.9%) and higher compressive strength (from 40.9 to 62.3 MPa).…”

Section: Influence Of Sintering Temperaturementioning

confidence: 99%

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Ultrahigh‐strength alumina ceramic foams via gelation of foamed boehmite sol

et al. 2019

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Ceramic foams with significant porosity and robust mechanical properties have received extensive attentions. However, it is still difficult to achieve excellent compressive strength at high porosity levels. In this work, a gelation of foamed boehmite sol method is proposed to settle this issue. The technological parameters during preparation process are systematically investigated. As‐prepared alumina ceramic foams possess unprecedentedly high compressive strength of 34.1‐89.1 MPa at high porosity levels of 66.0%‐87.2%, which is attributed to the present of hierarchical pore structure, small grain size and pore size. This work demonstrates a facile and novel method for the fabrication of high‐performance alumina ceramic foams toward practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Influence Of Sintering Temperaturementioning

confidence: 99%

Ultrahigh‐strength alumina ceramic foams via gelation of foamed boehmite sol

et al. 2019

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“…Alumina powders have the advantages of large specific surface area, higher chemical activity and thermal stability, high hardness and corrosion resistance and therefore they are widely used in aerospace, luminescent materials, artificial gemstones, and other fields . Alumina is also known as one of the most commonly used ceramic materials as catalysts, catalyst supports, absorbents, and wear‐resistant coatings and it can be prepared through methods such as sol–gel, hydrothermal, coprecipitation, mechanical milling, vapor‐phase reaction and combustion methods . Nanoscale alpha‐alumina (α‐Al 2 O 3 ) powder is difficult to obtain for two reasons.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐Assisted Modification of Nanoalumina with Vitamin B3 as an Eco‐Friendly Nanosorbent for Trace Metals

Mahmoud

Rashad

Ragab

et al. 2019

CLEAN Soil Air Water

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Vitamin B3 (nicotinic acid, NA) is selected as an example of a promising environmental eco-friendly metal sequestering reagent to functionalize the surface of nanoalumina-loaded sodium dodecyl sulfate (nano-Al 2 O 3 -SDS) sorbent. This reaction is accomplished via microwave-assisted heating using a solvent-free approach for the formation of a novel nano-Al 2 O 3 -SDS-NA sorbent. The functionalized nanomaterials are characterized by Fouriertransform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. A comparative study is performed to explore and evaluate the sorption behaviors of nano-Al 2 O 3 , nano-Al 2 O 3 -SDS, and nano-Al 2 O 3 -SDS-NA sorbents for removal of Cu(II), Zn(II), and Pb(II) from aqueous solutions by the batch adsorption technique. The desired selectivity characteristics in the evaluated nanosorbents are confirmed from the determined maximum metal sorption capacity values of Cu(ΙΙ), Zn(II), and Pb(II) as 5700, 900, and 700 mmol g À1 by nano-Al 2 O 3 -SDS-NA sorbent, respectively, using a 5 mg dosage. The optimum contact pH, time, initial metal ion concentration and competing species are also investigated. The Langmuir, Brunauer-Emmet-Teller and Dubinin-Radushkevich adsorption isotherm models are applied to evaluate the interaction processes of Cu(II), Zn(II), and Pb(II) by nano-Al 2 O 3 , nano-Al 2 O 3 -SDS, and nano-Al 2 O 3 -SDS-NA sorbents. The potential applications of these nanosorbents for adsorptive removal of metal cations from real samples are successfully optimized via a micro-column technique.

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“…Low‐thermal conductivity lightweight refractories show better heat insulation functions when they are laid closer to the wear lining . Tomiya et al used a kind of lightweight Al 2 O 3 –MgO–C brick as the wear lining for a ladle; the bulk density and thermal conductivity were both 10% lower than those of common Al 2 O 3 –MgO–C brick.…”

Section: Introductionmentioning

confidence: 99%

Corrosion mechanism of lightweight microporous alumina‐based refractory by molten steel

Zou

Huang

et al. 2018

J Am Ceram Soc

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Lightweight refractory linings for industrial furnaces have become important subjects of development in high‐temperature industries. The reaction mechanism between a lightweight microporous alumina‐based refractory material and molten steel was investigated in this study. The main mechanism of refractory damage was structural spalling, caused by steel penetrating the pores. The many micropores in lightweight microporous alumina have high specific surface area and reactivity, inducing the formation of FeO–Fe2O3–Al2O3 phases. This impeded the further penetration of molten steel and the direct dissolution of refractory oxides, promoting greater resistance to molten steel than that shown by common tabular alumina‐based refractories, in which Fe does not react and steel penetration through the pores cannot be retarded.

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Effect of nano-alumina sol on the sintering properties and microstructure of microporous corundum

Cited by 42 publications

References 26 publications

Ultrahigh‐strength alumina ceramic foams via gelation of foamed boehmite sol

Ultrahigh‐strength alumina ceramic foams via gelation of foamed boehmite sol

Microwave‐Assisted Modification of Nanoalumina with Vitamin B3 as an Eco‐Friendly Nanosorbent for Trace Metals

Corrosion mechanism of lightweight microporous alumina‐based refractory by molten steel

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