Influence of the particle size distribution of coarse-grained refractories on the thermal shock performance

Jens Fruhstorfer

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2 Citations (Scopus)


This study investigated the influences of the particle size distribution (characterized by the amounts of fines and coarses and by the maximum particle size (1|3 mm)) and the compaction pressure (50|100 MPa) of die-pressed bars on the behavior of the bulk density, cold modulus of rupture (CMOR) and Young’s modulus E during five thermal shocks (TS). Highest densities were obtained for wide particle size distributions with densest packed coarse aggregates, a slight excess of lubricating fines and a high compaction pressure. Highest CMOR and E were obtained for the same parameters with the exception of a maximum particle size of 1 mm inducing lower flaw sizes. Independent on the compaction pressure, lowest CMOR losses during TS were obtained for a wide particle size distribution with a high number of aggregates constituted of medium-sized grains and densest packed coarses. Supposedly, crack deflection and contact shielding toughening occurred. During TS, E behaved differently. Probably, E was low when there were many flaws. During TS, these led to a large process zone and high decrease of E whereas for batches with higher initial E a crack could propagate with less microstructural interactions giving supposedly a smaller process zone and a reduced decrease.

Original languageEnglish
Pages (from-to)899-909
Number of pages11
JournalJournal of the Australian Ceramic Society
Issue number3
Early online date30 Mar 2021
Publication statusPublished - Jul 2021

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Publisher Copyright: © 2021, Australian Ceramic Society.

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