Porous aluminium provides an unique combination of material properties:
– products are permeable over the whole volume
– can be manufactured in up to large sizes and in any form
– a high strength thanks to cast structure
– controlled high volume porosity
– variable and regulated pore sizes
– homogeneous distribution of the pores over the entire volume
Porous aluminium is obtained by casting of liquid Aluminium with granulated salt and subsequently washing out ofthe salt. Depending on the size of the salt grains we receive porous aluminium with different pore sizes.
We developed seven standard grades of porous alumina with pore sizes from 0.20 mm to 4.00 mm, which are presented in the table below (click on picture to enlarge).
|No. 1||No. 2||No. 3||No. 4||No. 5||No. 6||No. 7|
Properties of the porous aluminium vary depending on the pore sizes of the material, as well as from the technical parameters during the casting process. In the below table characteristics of porous Aluminium in six standard pore sizes are presented. Please consider, that some of the parameters can be changed upon customer’s request through individual selection of salt combination and variation of technical parameters while of the casting process.
You can use the permeability coefficient K (from the above table) for the flow rate calculation. For this the Darcy’s law will be applied:
111 К * ΔP * S
Q = ————–,
1111 μ * H
Q – flow rate, m3/sec
ΔP – pressure drop at the filter, Pa
S – filter surface, m2
μ – dynamic viscosity, Pa*sec
H – filter thickness, m