Filtration membranes prepared from nanopowders
AssigneeLiqTech Holding A/S
InventorEsra Eray
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Abstract
The present disclosure relates to the field of ceramic filtration membranes and methods for their preparation and use. In particular, the present disclosure relates to ceramic membranes prepared from SiC precursors comprising a mixture of two SiC powders each one with β-SiC crystalline phase and another with α-SiC crystalline phase and different particle sizes, respectively.
Claims20
A ceramic filter for filtration of liquid, the filter comprising at least one membrane said membrane comprising:
- a. a mixture of β-SiC and α-SiC phases;
- and
- b. pores with a maximum pore size of at most 120 nm and a pore size distribution having a d50 from about 40 nm to about 90 nm, and a d90 from about 60 nm to 100 nm.
A ceramic filter for filtration of liquid, the filter comprising at least one membrane obtained from sintering a mixture of ceramic particles comprising or consisting of:
- a. β-SiC particles having a median particle size (d50) below 60 nm, and
- b. α-SiC particles having a median particle size (d50) below 1 μm.
A method of producing a membrane for a ceramic filter, the method comprising:
- a. providing a suspension of a ceramic precursor comprising:
- i. β-SiC particles having an median particle size (d50) below 60 nm, and
- ii. α-SiC particles having a median particle size (d50) below 1 μm;
- b. shaping the suspension as a membrane onto a support layer;
- C. drying the homogeneous dispersion in b) to obtain a dry ceramic precursor;
- and
- d. sintering the dry ceramic precursor in c) at a temperature from about 1400° C. to about 1600° C. in an inert atmosphere.
Dependencies are inferred from the claim text.