Abstract
Powders in granulated form are used in various processes
to facilitate convenient usage. The durability ofthe
formed granules is a crucial parameter, typically
evaluated by the compressive strength of the gran-ules.
However, especially for granules with a diameter in the
order of tens of microns, statistically relevanttesting
of individual granules is not a feasible alternative, and
in such cases uniaxial bed compression isrequired.There
has not been consensus on whether uniaxial compression of
a granule bed can be used to studythe fracture of micron
size or brittle granules. In our case study of a bed of
sintered kaolinite granuleswith diameters under 100 m, we
show how the compressive strength of individual granules
can beobtained from the compressive measurement of the
entire bed by plotting the relative density versus
thelogarithmic pressure scale.We compressed the kaolinite
powder with different loads; microscopy confirmed that
below the ana-lyzed strength the granules are intact,
though the granules start to fracture in the curved
region on thecompression curve. We found that
angle-fitting can be used to locate the average
compressive strengthon the compression curve and to
follow the evolution of strength with sintering
temperature. The experi-ments in unison demonstrate that
compression curve analysis is applicable for strength
analysis of brittlegranules.
Original language | English |
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Pages (from-to) | 60-68 |
Journal | Particuology |
Volume | 29 |
DOIs | |
Publication status | Published - 2016 |
MoE publication type | A1 Journal article-refereed |
Keywords
- granule
- mechanical characterization
- pressing
- compressive strength
- sintering
- compression curves