Effects of impurities on the slip viscosity and sintered properties of low-soda easy-sintered α-alumina

Kang, Min Ji; Yoon, Dang‐Hyok

doi:10.1007/s43207-022-00192-2

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…Both Na + and Mg 2+ significantly increase viscosity. In general, impurities affect slip viscosity [ 45 ]. Keeping the viscosity of ceramic powders as low as possible is important for obtaining printed parts of high quality and accuracy [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Kwiatkowski,

Marczyk,

Putyra

et al. 2023

Materials

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Alumina is one of the most popular ceramic materials widely used in both tooling and construction applications due to its low production cost, and high properties. However, the final properties of the product depend not only on the purity of the powder, but also, e.g., on its particle size, specific surface area, and the production technology used. These parameters are particularly important in the case of choosing additive techniques for the production of details. Therefore, the article presents the results of comparing five grades of Al2O3 ceramic powder. Their specific surface area (via Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) methods), particle size distribution, and phase composition by X-ray diffraction (XRD) were determined. Moreover, the surface morphology was characterized by the scanning electron microscopy (SEM) technique. The discrepancy between generally available data and the results obtained from measurements has been indicated. Moreover, the method of spark plasma sintering (SPS), equipped with the registration system of the position of the pressing punch during the process, was used to determine the sinterability curves of each of the tested grades of Al2O3 powder. Based on the obtained results, a significant influence of the specific surface area, particle size, and the width of their distribution at the beginning of the Al2O3 powder sintering process was confirmed. Furthermore, the possibility of using the analyzed variants of powders for binder jetting technology was assessed. The dependence of the particle size of the powder used on the quality of the printed parts was demonstrated. The procedure presented in this paper, which involves analyzing the properties of alumina varieties, was used to optimize the Al2O3 powder material for binder jetting printing. The selection of the best powder in terms of technological properties and good sinterability makes it possible to reduce the number of 3D printing processes, which makes it more economical and less time-consuming.

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Section: Methodsmentioning

confidence: 99%

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Kwiatkowski,

Marczyk,

Putyra

et al. 2023

Materials

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“…Low soda alumina is generally defined as an alumina hydrate with soda content of less than 0.1% by weight. This can be manufactured by many different routes, including acid washing, chlorine addition, boron addition, and the use of soda adsorbing compounds [75][76][77].…”

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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Surface passivation of α-Al2O3 powder using water vapor to achieve consistent slurry viscosity

You,

Yoon

2023

J. Korean Ceram. Soc.

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Effects of impurities on the slip viscosity and sintered properties of low-soda easy-sintered α-alumina

Cited by 7 publications

References 32 publications

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Short review on mechanical activation in non-metallurgical alumina production

Surface passivation of α-Al2O3 powder using water vapor to achieve consistent slurry viscosity

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