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SUMMARY:Influencing the processing\, rheology and setting behaviour of CAC
 -containing refractory castables by adjusting the particle size distributi
 on and thus the specific surface area of the ceramic matrix - Florian Holl
 eyn
DTSTART;TZID=Europe/Berlin:20240918T144000
DTEND;TZID=Europe/Berlin:20240918T150000
DTSTAMP:20261009T011022Z
UID:pretalx-icr2024-ZTBU7Q@pretalx.com
DESCRIPTION:Beside the coarse and medium grain size distribution\, the mat
 rix components play a pivotal role in the performance of refractory castab
 les. Based on practical experience\, it is evident that the PSD and the re
 sulting specific surface area of the ceramic matrix exert a significant in
 fluence on the processing\, setting and sintering properties of refractory
  castables\, which in turn influence each other. However\, there is a pauc
 ity of knowledge regarding the extent to which the properties of refractor
 y castables are influenced by changes in PSD or specific surface area of t
 he raw materials in the matrix. The objective is to gain a general underst
 anding of this.\nTo shed more light on this issue\, the ceramic matrices w
 ere varied\, resulting in model castables with gradations in the specific 
 surface area of the matrix. The refractory castables were dispersed using 
 two disparate dispersing agents with different mechanisms of action (elect
 rosteric and steric) at graded concentrations.\nThis contribution demonstr
 ates that matrices with lower specific surface areas require less mixing e
 nergy than coarser ones. A higher specific surface area leads to a lower s
 lump-flow. A shear-thinning behaviour was observed for matrix compositions
  with higher specific surface areas and a dilatant behaviour for matrix co
 mpositions with lower specific surface areas. Higher specific surface area
 s of the matrix result in an earlier first rise of the US signal\, while t
 he addition of more dispersing agent leads to a delayed first stiffening. 
 However\, there are clear differences in the setting behaviour of the vari
 ous dispersing agents.
LOCATION:Europe Hall
URL:https://pretalx.com/icr2024/talk/ZTBU7Q/
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