Fabrication of porous spinel (MgAl2O4) from porous alumina using a template method

Hashimoto, Shinobu; Honda, Sawao; Hiramatsu, Tomoki; Iwamoto, Yuji

doi:10.1016/j.ceramint.2012.08.062

Cited by 61 publications

(27 citation statements)

References 14 publications

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“…Under all conditions, the perpendicular thermal conductivity was higher than the parallel conductivity. Previously, we considered the thermal conductivity of a uniform porous alumina body made from alumina platelets [22,23]. The thermal conductivity λ₀ was expressed using the following equation:…”

Section: Grain Orientation In the Porous Alumina Bodymentioning

confidence: 99%

Anisotropic properties of highly textured porous alumina formed from platelets

Honda

Hashimoto

Iwata

et al. 2016

Ceramics International

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Section: Grain Orientation In the Porous Alumina Bodymentioning

confidence: 99%

Anisotropic properties of highly textured porous alumina formed from platelets

Honda

Hashimoto

Iwata

et al. 2016

Ceramics International

Self Cite

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“…In previous researches [7][8][9][10], the methods of extrusion, unidirectional solidification in pressurized mixed gases, template-formation, etc. were adopted to prepare porous MgOAl 2 O 3 ceramics.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of porous MgO–Al2O3 refractory aggregates using an in-situ decomposition pore-forming technique

Yan

Chen

et al. 2015

Ceramics International

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“…These observations suggest that doping Al 2 O 3 /2SiO 2 can accelerate sintering of the ceramic matrix. Besides, the linear dimension change rate of specimens sintered at 1550 °C was higher than that at 1450 °C because the inter-crystalline structure became consolidated and the linear shrinkage rate increased with increasing sintering temperature; however, an inflection point at 45 wt% Al 2 O 3 /2SiO 2 addition could fully evince that the phase composition of sintered specimens included periclase, spinel, and forsterite at this time, the spinel content was increased and the formation of magnesium aluminate spinel occurred with a volumetric expansion of 5 to 7 % [19] . This phenomenon could offset part of the volumetric shrinkage caused by sintering.…”

Section: Resultsmentioning

confidence: 88%

Effects of doping Al2O3/2SiO2 on the structure and properties of magnesium matrix ceramic

Zhou

Luo

et al. 2016

Materials Chemistry and Physics

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To improve the sintering properties and the thermal shock resistance of magnesium matrix ceramic, this work used micron-sized MgO as the main raw material and nano-Al 2 O 3 and SiO 2 as additives. Magnesium matrix ceramic was doped with different amounts of Al 2 O 3 and SiO 2 (Al 2 O 3 and SiO 2 at a molar ratio of 1:2) and sintered under standard atmospheric conditions. The effect of Al 2 O 3 /2SiO 2 doping amounts on sintering properties, thermal shock resistance, phase composition, and microstructure of composite ceramic materials were investivigated. The results suggested that introducing Al 2 O 3 /2SiO 2 could improve the sintering properties of magnesium matrix ceramic. The grain boundary migration of its periclase phase could be hindered by the magnesium aluminate spinel and forsterite formed by solid reaction including Al 2 O 3 , SiO 2 addition, and the MgO itself. Furthermore, according to the mechanism of thermal expansion mismatching, with increasing Al 2 O 3 /2SiO 2 addition, thermal shock times increased significantly, the number of ceramic internal micro-cracks increased after the thermal shock and the material fracture surface energy was improved. It is found that the way of transgranular combining intergranular fractures can decrease the stress concentration at the crack tips and hinder crack propagation. The secondary phase particles deflected matrix internal micro-cracks and the crack propagation path length thus increased, residual stress field were subjected to interference and energy dissipation mechanisms improved. Meanwhile, thermal shock times for the material were enhanced and the degree of densification increased with increasing sintering temperature.

show abstract

Fabrication of porous spinel (MgAl2O4) from porous alumina using a template method

Cited by 61 publications

References 14 publications

Anisotropic properties of highly textured porous alumina formed from platelets

Anisotropic properties of highly textured porous alumina formed from platelets

Preparation and characterization of porous MgO–Al2O3 refractory aggregates using an in-situ decomposition pore-forming technique

Effects of doping Al2O3/2SiO2 on the structure and properties of magnesium matrix ceramic

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