Abstract
A new technology to coat open-celled foams homogeneously by using a vertical centrifuge and shear-thinning slurries is presented. The technology is exemplified by a complex multilayer-coated foam for catalytic applications (Fig. 3). Furthermore, a new calculation model for the estimation of coating thickness and for quality assessment is introduced and proved by comparing the calculated and experimental data. Based on these results, various material combinations are shown, e.g., layers made of rough particles, zeolites, activated carbon, γ-Al2O3, perovskites, mullite, and yttria–alumina–garnet on SiC–, Al2O3–, or cordierite foams. Theses “functionalized foams” can be used for a wide variety of practical applications, e.g., as adsorbents and catalysts in environmental engineering, as preforms for metal matrix composites, and for special purpose applications that require corrosion and oxidation resistance.
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Acknowledgment
Parts of the presented work were financially supported by German Federal Ministry of Education and Research (BMBF) and BMWI (Grant Nos. 01LS05016 and AiF161ZBR/2).
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Nomenclature
- a r
-
radial acceleration
- a r_min
-
minimal radial acceleration
- d CA,si.
-
measured layer thicknesses of CA-washcoat
- d dip
-
layer thickness that is formed by dipping
- d spin
-
layer thickness that is formed by centrifugation (spinning)
- \(\bar d_{{\rm{spin}}}\)
-
medium layer thickness that is formed by centrifugation (spinning)
- d s
-
diameter of the foam strut
- d w
-
diameter of the cell window
- D
-
foam thickness
- E/ρ
-
specific stiffness
- G′
-
storage modulus
- G″
-
loss modulus
- k
-
specific permeability
- N
-
rotational speed of the centrifuge
- Δp
-
pressure drop
- sc
-
solid content
- S geo
-
specific geometrical surface area
- s total
-
drying and sinter shrinkage
- V
-
superficial air velocity
- β
-
inertial coefficient
- ε0
-
open foam porosity
- η
-
dynamic viscosity
- ρ
-
gas density
- ρS
-
slurry density
- τ0
-
yield point
- τrep
-
representative shear stress
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Boettge, D., Standke, G., Fuessel, A. et al. Functionalization of open-celled foams by homogeneous slurry based coatings. Journal of Materials Research 28, 2220–2233 (2013). https://doi.org/10.1557/jmr.2013.127
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DOI: https://doi.org/10.1557/jmr.2013.127