Re-fluidising the aged gel for high-density alumina green body

Wu, Xiaolang; Jian-Gao, Zhao; Shimai, Shunzo; Mao, Xiaojian; Zhang, Jian; Wang, Shiwei

doi:10.1007/s40145-022-0615-1

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Various mineralizers are added to the raw gibbsite to lower the recrystallization temperature of α-alumina. These alumina products are used in various ceramic and refractory applications [72][73][74]. Low Soda Alumina.…”

Section: Commercial Types Of Alumina Productsmentioning

confidence: 99%

Short review on mechanical activation in non-metallurgical alumina production

Kim¹,

Dobra²,

Isopescu³

et al. 2022

RJEEC

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The terms mechano-chemistry and mechanical activation of solid materials were introduced in chemical literature by Ostwald at the beginning of the XX century. Both terms cover a whole range of interconnected phenomena taking place during the mechanical action on solids or their separate parts participating in chemical reactions, phase transitions, mixing and creating composite materials, alloying and crystal growth in the solid state, deformation and changing physical and thermal properties, all of them at low temperature. The common effects of the mechanical activation on solid material are fracturing and reduction of particle sizes, generation of new reactive surfaces, diffusion of atoms of the reactant phase through the product phase, and quite significantly, accumulating energy in crystalline or amorphous structure (enough twists in atomic and molecular networks, tensions in atomic bond and active sites to trigger the nucleation of new phases). Mechanical activation is very used to produce all clean alumina mineralogical phases with uniform particle size dimensions from nano to macro size. Also, mechanical activation may extend the specific surface of some minerals, enhancing the yields in the solid-liquid extraction process. With adequate precursors, all phase transitions from amorphous to alfa α-Al2O3 can be carried out on the same route as in thermally activated alumina, but some other routes, impossible by thermal activation, might be followed. The difference between the two activation ways is that mechanical activation is made at room temperature.

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Section: Commercial Types Of Alumina Productsmentioning

confidence: 99%

Short review on mechanical activation in non-metallurgical alumina production

Kim¹,

Dobra²,

Isopescu³

et al. 2022

RJEEC

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show abstract

“…This process forms wet green bodies by in situ curing of ceramic particles. The SCC gel system is characterized as a physical gel with low organic network density and an absence of chemical connections [17,18]. Consequently, the green body produced using this method is brittle and becomes more fragile as the particle size of the powder decreases.…”

Section: Introductionmentioning

confidence: 99%

Enhanced plasticity of spontaneous coagulation cast oxide ceramic green bodies

Wang,

Zhao,

Mao

et al. 2024

Journal of Advanced Ceramics

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In the preparation of large-sized ceramics, the use of a green body with relatively high plasticity is crucial to minimize the risk of cracking during processing. To achieve this goal, glycerol and polyethylene glycol (PEG) were utilized as plasticizers in the shaping of green bodies of oxide ceramics through spontaneous coagulation casting (SCC). This study investigated the effects of plasticizers and particle sizes ranging from the submicron to nanoscale on the slurry viscosity, drying shrinkage of wet gels, and mechanical properties of green bodies. The plasticity of the green bodies was assessed by measuring the impact toughness and flexural stress-strain curves. By incorporating an appropriate plasticizer, the peak width of the flexural stress-strain curve for dried green bodies from particles of different sizes was nearly twice that without plasticizers, and the impact toughness was enhanced by approximately 71%, 34%, and 41% when the particle size decreased from the submicron scale to the nanoscale (0.45 μm, 0.18 μm, and 50 nm, respectively). The drilling test revealed that there was nearly no cracking around the holes in the green bodies with plasticizers. The plasticity mechanism of the green bodies was examined based on ultraviolet-visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM). It was discovered that plasticizers might mitigate the brittleness of green bodies by adjusting the interactions between molecules and modifying the gel network properly.

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A synergistic dispersion strategy for high volume fraction slurry and high performance silicon nitride sintered components in digital light processing (DLP)-based vat photopolymerization

Lu,

Lin,

et al. 2024

Additive Manufacturing

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Re-fluidising the aged gel for high-density alumina green body

Cited by 5 publications

References 23 publications

Short review on mechanical activation in non-metallurgical alumina production

Short review on mechanical activation in non-metallurgical alumina production

Enhanced plasticity of spontaneous coagulation cast oxide ceramic green bodies

A synergistic dispersion strategy for high volume fraction slurry and high performance silicon nitride sintered components in digital light processing (DLP)-based vat photopolymerization

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