The grinding of porous ion exchange particles

Schäfer, Maria; Kemtchou, Valéry Tchanque; Peuker, Urs A.

doi:10.1016/j.powtec.2015.12.003

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…The SMM is known for the capability to produce nano-sized materials [9,13]. It is typically operated in wet mode, where a slurry is pumped through the chamber.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of High Performance Geopolymers by Wet Milling of Blast Furnace Slags

Peuker

2019

MSF

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Since more than 100 years blast furnace slags are used as additive material or substitute material in cementitious systems like mortar and concrete. Due to their different syntheses the slag systems have binding properties which differ from conventional clinker. With the help of mechanical activation due to fine grinding the properties of blast furnace slags are shifted towards clinker systems. The application of stirred media mills allow for a production of a very fine reactive system.

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“…The SMM is known for the capability to produce nano-sized materials [9,13]. It is typically operated in wet mode, where a slurry is pumped through the chamber.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of High Performance Geopolymers by Wet Milling of Blast Furnace Slags

Peuker

2019

MSF

Self Cite

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“…However, the process of the cold-wet comminution of polymers in stirred media mills [ 15 ] shows much potential for the production of polymer powders for the PBF process. Compared to cryogenic (dry) comminution [ 16 , 17 , 18 ], no extreme temperatures are required, and it is possible to produce a wide range of different polymers in suitable sizes for the PBF process [ 15 , 19 , 20 , 21 , 22 , 23 , 24 ]. In particular, wet comminution allows one to produce smaller particles than dry comminution, in several cases even below 5 µm [ 15 ], which opens new possibilities for the production of novel composite powders or fine-structured parts using smaller than ‘state-of-the art’ particles, if the powder flowability is maintained.…”

Section: Introductionmentioning

confidence: 99%

Abrasion-Induced Acceleration of Melt Crystallisation of Wet Comminuted Polybutylene Terephthalate (PBT)

et al. 2022

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Within this contribution, the effect of grinding media wear on the melt crystallisation of polybutylene terephthalate (PBT) is addressed. PBT was wet ground in a stirred media mill in ethanol using different grinding media beads (silica, chrome steel, cerium-stabilised and yttrium-stabilised zirconia) at comparable stress energies with the intention to use the obtained particles as feed materials for the production of feedstocks for laser powder bed fusion additive manufacturing (PBF-AM). In PBF‑AM, the feedstock’s optical, rheological and especially thermal properties—including melt crystallisation kinetics—strongly influence the processability and properties of the manufactured parts. The influence of process parameters and used grinding media during wet comminution on the optical properties, crystal structure, molar mass distribution, inorganic content (wear) and thermal properties of the obtained powders is discussed. A grinding media-dependent acceleration of the melt crystallisation could be attributed to wear particles serving as nuclei for heterogeneous crystallisation. Yttrium-stabilised zirconia grinding beads proved to be the most suitable for the production of polymer powders for the PBF process in terms of (fast) comminution kinetics, unchanged optical properties and the least accelerated crystallisation kinetics.

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“…However, typically irregular-shaped, cohesive particles are obtained that cannot be employed in LBM without further modification. Therefore, a process route for production of spherical polymer microparticles with good flowability consisting of wet grinding (Schmidt et al, 2012;Wolff et al, 2014;Schäfer et al, 2016), rounding of the irregular-shaped comminution product in a heated downer reactor and a dry coating step (Pfeffer et al, 2001;Yang et al, 2005;Blümel et al, 2015) has been proposed and successfully applied to polystyrene (Schmidt et al, 2014). Compared to dry grinding, wet grinding of polymers allows for much smaller product particles giving the opportunity to lower the size range of LBM materials.…”

Section: Introductionmentioning

confidence: 99%

Optimized polybutylene terephthalate powders for selective laser beam melting

Schmidt

Sachs

Fanselow

et al. 2016

Chemical Engineering Science

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Additive manufacturing processes like selective laser beam melting of polymers (LBM) are established for production of prototypes and individualized parts. The transfer to serial production currently is hindered by the limited availability of polymer powders with good processability.Within this contribution the effect of powder properties, such as particle size, shape and flowability on the processability in LBM and their influence on device quality is exemplified for polybutylene terephthalate (PBT) materials. A process chain for the production of spherical polymer microparticles has been developed to obtain PBT powder materials. The process chain consists of three steps: First, polymer microparticles are produced by wet grinding.Second, the particle shape is engineered by rounding in a heated downer reactor to improve the flowability of the product. A further improvement of flowability of the still cohesive spherical PBT particles is realized by dry coating with fumed silica.

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The grinding of porous ion exchange particles

Cited by 4 publications

References 24 publications

Synthesis of High Performance Geopolymers by Wet Milling of Blast Furnace Slags

Synthesis of High Performance Geopolymers by Wet Milling of Blast Furnace Slags

Abrasion-Induced Acceleration of Melt Crystallisation of Wet Comminuted Polybutylene Terephthalate (PBT)

Optimized polybutylene terephthalate powders for selective laser beam melting

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