Abstract
We show that the honeycomb out-of-plane model derived by Gibson and Ashby can be applied to describe the compressive behavior of unidirectional porous materials. Ice-templating allowed us to process samples with accurate control over pore volume, size, and morphology. These samples allowed us to evaluate the effect of this microstructural variations on the compressive strength in a porosity range of 45–80%. The maximum strength of 286 MPa was achieved in the least porous ice-templated sample (P(%) = 49.9), with the smallest pore size (3 μm). We found that the out-of-plane model only holds when buckling is the dominant failure mode, as should be expected. Furthermore, we controlled total pore volume by adjusting solids loading and sintering temperature. This strategy allows us to independently control macroporosity and densification of walls, and the compressive strength of ice-templated materials is exclusively dependent on total pore volume.
Highlights
Macroporous ceramics are widely used in applications such as filtration, thermal insulation, scaffolds for tissue engineering, oxygen transport membranes, and solid oxide fuel cells[1,2]
Our objective is to characterize the compressive strength of ice-templated ceramics in a broad porosity range and link their mechanical behavior to the pore architecture
We investigated the effects of pore volume, size, morphology, and directionality on the compressive behavior of porous materials
Summary
Macroporous ceramics are widely used in applications such as filtration, thermal insulation, scaffolds for tissue engineering, oxygen transport membranes, and solid oxide fuel cells[1,2] They must combine mechanical stability with at least one other functional property such as high permeability, low thermal conductivity, or biocompatibility. The green body is sintered to consolidate the microstructure This process provides control of the pore architecture (pore volume, size, and morphology) through initial solids loading, cooling rate, or additives. Hunger et al.[9] described the mechanical behavior of a chitosan-hydroxiapatite composite using an hybrid model accounting for the unidirectional pores and the porosity in the walls These studies are mostly limited to a highly porous materials (> 80%) and a more detailed work describing the www.nature.com/scientificreports/. Microstructural effects on compressive strength of unidirectional porous ceramics in a broader porosity range is still lacking
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