Correlations Between Suspension Formulation, Drying Parameters, Granule Structure, and Mechanical Properties of Spray Dried Ceramic Granules

Eckhard, Susanna; Höhn, Sören; Fries, Manfred

doi:10.1007/978-3-319-32370-1_11

Cited by 1 publication

(1 citation statement)

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“…However, owing to the nature of mass transfer during the drying of droplets in a hot gas flow, organic additives are segregated from a granule volume to its boundaries. Segregation of an organic binder creates a dense and strong shell on a granule surface, thus increasing its strength 8 . This may contribute to an efficient rearrangement of granules into a press mold; however, it also prevents their complete breakdown.…”

Section: Introductionmentioning

confidence: 99%

Morphology of alumina granules obtained by spray freeze drying with twin‐fluid atomization

Kuzmin

Veselov

Cherkasova

et al. 2021

Int J Applied Ceramic Tech

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This study presents the results of the morphological dependence of alumina granules obtained by spray freeze drying (SFD) with twin‐fluid atomization. It is shown that the introduction of 1‐, 2‐ and 4‐wt.% polyvinyl alcohol (PVA) as a binder in an alumina suspension leads to the formation of irregular granules. Depending on atomization conditions, spherical, “tadpole‐like,” granule‐satellite and granule aggregates may form during SFD. Increasing the flight time of droplets before the fixing of their shape when they come in contact with liquid nitrogen effectively contributes to the spheroidization of alumina granules. Compacting PVA‐free SFD granules leads to the formation of diagonal flaws in a green‐body structure. Adding PVA prevents the abovementioned defects by increasing the strength of alumina granules. Increasing the amount of PVA leads to an increase in “tadpole‐like” granule content and, consequently, a decrease in a green‐body density.

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Section: Introductionmentioning

confidence: 99%