Pore evolution of microporous magnesia aggregates with the introduction of nano-sized MgO

Zou, Yongshun; Gu, Huazhi; Huang, Ao; Fu, Lvping; Li, Guangqiang; Wang, Liwang; Chen, Ding

doi:10.1016/j.ceramint.2022.03.121

Cited by 10 publications

(2 citation statements)

References 35 publications

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“…Given that the porosity contents of the fired samples with clay additive have not markedly changed, the slight decrease in bulk density values caused by adding clay, as shown in Fig. 4, may be attributed to the differences in density of clay (2.86 g/cm 3 ) [34] and magnesite (3.23 g/cm 3 ) [35]. Such an attribution is supported by the nearly constant shrinkage of the samples with various amounts of clay, as illustrated in As can be expected, the bulk density and shrinkage of the samples increased with increasing the sintering temperature.…”

Section: Porosity Bulk Density and Shrinkagementioning

confidence: 92%

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

et al. 2022

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This study investigates the effects of adding clay and fireclay on the physical and mechanical properties of magnesia-based refractories such as contraction, bending strength, bulk density, and apparent porosity. Domestic raw materials were used for the preparation of samples fired at 1350, 1450, and 1550 °C for 2 h. Adding clay exhibited no significant effect on the density and porosity, whereas adding fireclay had a remarkable influence on the shrinkage. Nevertheless, the effects of clay and fireclay on the strength of magnesia were unnoticeable. X-ray diffraction results showed that, after firing, the main phase compositions of the samples with clay addition were periclase and forsterite. Adding fireclay led to the synthesis of magnesite spinel, which can be attributed to the high alumina content. Based on scanning electron microscopy, no liquid phase was formed indicating that the sintering was a solid-state evolution with the synthesis of forsterite.

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Section: Porosity Bulk Density and Shrinkagementioning

confidence: 92%

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

et al. 2022

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“…Compared with these methods, the in-situ decomposition synthesis method is suitable for the large-scale manufacture of microporous MgO-Al 2 O 3 refractory aggregates with a simple process and environment-friendly. [33][34][35][36][37] For example, microporous spinel aggregates were prepared with magnesite and Al(OH) 3 , which gained a bulk density of 1.40-1.48 g/cm 3 , an apparent porosity of 58.2%-60.4% and a median pore size of 6.8-10.0 μm. 38 However, due to the impurity of raw material magnesite, a small amount of liquid phase promoted the merging and growth of nanopores in the magnesite pseudomorph particles.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃

Yan,

Wang

et al. 2023

Int J Applied Ceramic Tech

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In this work, microporous MgO–Al2O3 refractory aggregates were prepared with Mg(OH)2 and Al(OH)3 via the in situ decomposition synthesis method. The effect of Al(OH)3 addition on the microstructure and properties of microporous MgO–Al2O3 refractory aggregates was investigated with scanning electron microscope and mercury intrusion porosimetry. The results indicated that the improved green density of the samples and the reaction sintering accelerated the mass transport rate with adding Al(OH)3 from 0 to 4.0 wt%. Besides, a small amount of Al3+ diffused into porous MgO particles, accelerating the merging and growth of nanopores in the porous MgO particles. The intra‐particle pore size and the densification degree of microparticles were increased, and thus the strength of the samples was improved. Due to the formation of Kirkendall voids by interdiffusion of Mg2+ and Al3+, the inter‐particle pore size increased. Adding Al(OH)3 from 4.0 to 17.6 wt%, the Kirkendall voids weakened the mass transport rate and improved the inter‐particle pore size. The merging and growth of nanopores in the MgO particles were limited, resulting in the reduced intra‐particle pore size and increased intra‐particle pore number. The densification degree of microparticles was reduced, and thus the strength of the samples decreased. At the Al(OH)3 addition of 4.0 wt%, microporous MgO–Al2O3 refractory aggregates had the best comprehensive properties, a bulk density of 2.48 g/cm3, an apparent porosity of 29.4%, a median pore size of 1.6 μm with 42.2 vol% nanopores and the thermal conductivity of 4.0 W/(m K).

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Fabrication and properties of lightweight zirconia with fine closed porosity

Zhang,

Gu,

et al. 2023

J. Iron Steel Res. Int.

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Pore evolution of microporous magnesia aggregates with the introduction of nano-sized MgO

Cited by 10 publications

References 35 publications

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃

Fabrication and properties of lightweight zirconia with fine closed porosity

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Pore evolution of microporous magnesia aggregates with the introduction of nano-sized MgO

Cited by 10 publications

References 35 publications

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

Effects of clay and fireclay addition on the properties of magnesia–forsterite–spinel refractories synthesized at different firing temperatures

Microstructure and properties of microporous MgO–Al2O3 refractory aggregates from Mg(OH)2 and Al(OH)3

Fabrication and properties of lightweight zirconia with fine closed porosity

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Product

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Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃