Investigating the Physical Properties of Sintered Alumina in the Presence of MgO Nanopowder

Dadkhah, Mehran; Saboori, Abdollah; Jafari, Morad

doi:10.1155/2014/496146

Cited by 8 publications

(4 citation statements)

References 24 publications

(28 reference statements)

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“…It is interesting to note that the observed new grains in this study is contrary to the reported alumina final grain size of 2.6 mm sintered at 1570°C for 4 h by conventional thermal sintering [21]. Therefore, result obtained in this study shows that using CSP under specified conditions, a polycrystalline material with preserved or controlled crystallite sizes could be achieved as reported in a related study [19].…”

Section: Resultscontrasting

confidence: 76%

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

Suleiman

Ding

et al. 2019

Front. Chem. Sci. Eng.

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A form stable NaCl-Al 2 O 3 (50-50 wt-%) composite material for high temperature thermal energy storage was fabricated by cold sintering process, a process recently applied to the densification of ceramics at low temperature 300°C under uniaxial pressure in the presence of small amount of transient liquid. The fabricated composite achieved as high as 98.65% of the theoretical density. The NaCl-Al 2 O 3 composite also retained the chloride salt without leakage after 30 heating-cooling cycles between 750°C-850°C together with a holding period of 24 h at 850°C. X-ray diffraction measurements indicated congruent solubility of the alumina in chloride salt, excellent compatibility of NaCl with Al 2 O 3 , and chemical stability at high temperature. Structural analysis by scanning electron microscope also showed limited grain growth, high density, uniform NaCl distribution and clear faceted composite structure without inter-diffusion. The latent heat storage density of 252.5 J/g was obtained from simultaneous thermal analysis. Fracture strength test showed high sintered strength around 5 GPa after 50 min. The composite was found to have fair mass losses due to volatilization. Overall, cold sintering process has the potential to be an efficient, safe and cost-effective strategy for the fabrication of high temperature thermal energy storage materials.

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Section: Resultscontrasting

confidence: 76%

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

Suleiman

Ding

et al. 2019

Front. Chem. Sci. Eng.

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“…This process improves the quality of sintered alumina. 24 Magnesia-doped alumina has good strength, hardness and improved toughness. 25 Yttria-doped zirconia is a solid electrolyte for fuel cell applications.…”

Section: Halogens As Mineralizersmentioning

confidence: 99%

Accelerated physical and chemical transformations in ceramics processing

Kiss

Panić

2019

JSCS

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From economic and environmental points of view, solid phase chemical reactions are very important parts of modern chemistry and technology, enabling various processes to become cleaner, safer and easier to perform. This survey presents the basic concepts of solid-state transformations in ceramics processing, including notions and phenomena described in capital books on silicate chemistry, published more than 100 years ago, to the present day. During this period, scientists and practitioners in the field of ceramics processing used concepts related to the acceleration of phase transitions and chemical reactions. Today, the differences between various accelerating agents (flux agents, mineralizers and catalysts) in terms of their composition and mechanism of action are almost completely defined and clearly delimited. However, in ceramics processing, a more general term additive is preferably used instead of the previously mentioned ones. The aim of this work is to show that all accelerating agents are equally important to researchers in the field of catalysis and material science, emphasizing that the used terminology could be interpreted from different perspectives.

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“…Furthermore, we evaluate the effects of magnesium addition on the microstructural and compositional features of the resulting materials. The rationale behind the introduction of magnesium is based on the reported positive effect of MgO on the densification of alumina, improving the mechanical properties of alumina even at low additions (< 0.25 %) [26][27][28]. With respect to iron aluminides, we hypothesize that a correspondingly positive effect on the formation of the alumina scale, which is responsible for the excellent corrosion stability, can be achieved by introducing magnesium as a precursor to MgO under application conditions.…”

Section: Introductionmentioning

confidence: 99%

Powder Metallurgy Manufacturing of Iron Aluminides with Different Aluminium Contents and Magnesium Addition by Reactive Hot Pressing

Konegger

Gierl‐Mayer

Sikora

et al. 2020

Powder Metallurgy Progress

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In this work, iron aluminide materials, which are promising candidates for high temperature applications, are manufactured through reactive hot pressing of elemental powder mixes, facilitating a straightforward preparation of well-densified materials with a high degree of microstructural homogeneity. The impact of varying Al additions on reaction behavior, microstructural and compositional features of the resulting materials is evaluated. Furthermore, the effect of adding 1 wt. % Mg on reactivity and phase formation is illustrated. The results show that reactive hot pressing of elemental powders in the Fe-Al and Fe-Al-Mg systems at 1000 °C results in residual porosities well below 5 %. Magnesium addition significantly increased reactivity between constituents, leading to slightly improved densification without exhibiting potentially detrimental segregation phenomena. The processing approach presented in this work leads to material characteristics which are promising in the context of developing materials with favorable mechanical and tribological performance at elevated temperatures.

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Investigating the Physical Properties of Sintered Alumina in the Presence of MgO Nanopowder

Cited by 8 publications

References 24 publications

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

Accelerated physical and chemical transformations in ceramics processing

Powder Metallurgy Manufacturing of Iron Aluminides with Different Aluminium Contents and Magnesium Addition by Reactive Hot Pressing

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