Producing open-porous inorganic component with layer having homogenous pore structure, comprises solidifying emulsion consisting of stabilized aqueous inorganic suspension, alkane and emulsifier to obtain basic body by freezing process

Suelen Barg (Other), Dietmar Koch (Other), Christian Soltmann (Other)

    Research output: Patent

    Abstract

    The method comprises solidifying emulsion consisting of stabilized aqueous inorganic suspension, alkane and emulsifier to obtain a basic body by a freezing process, emulsifying alkane with a volume of 45-75% related to the total volume of the emulsified suspension in an aqueous inorganic suspension, so that the developed emulsion droplets have a size of smaller than 50mu m and the formed emulsion suppresses the growth of single crystals, which are larger than 50 mu m, during freezing the aqueous phase, and freezing the produced emulsion, so that only the water freezes in the emulsion. The method comprises solidifying emulsion consisting of stabilized aqueous inorganic suspension, alkane and emulsifier to obtain a basic body by a freezing process, emulsifying alkane with a volume of 45-75% related to the total volume of the emulsified suspension in an aqueous inorganic suspension, so that the developed emulsion droplets have a size of smaller than 50mu m and the formed emulsion suppresses the growth of single crystals, which are larger than 50 mu m, during freezing the aqueous phase, freezing the produced emulsion, so that only the water freezes in the emulsion and the emulsified alkane remains liquid, drying the component, in which under maintaining the frozen state of the water, the alkane is evaporated at reduced pressure and then the water is removed from the component by sublimation or by other drying process, and subsequently sintering the obtained basic body. The inorganic powder in the stabilized aqueous suspension is ceramic powder, metal powder, mineral powder, metal carbide powder and/or metal nitride powder, and is used with an average particle size of smaller than 50 mu m. A colloidal nanosol is used as inorganic constituent in the aqueous inorganic suspension. A binder is used as further constituent in the aqueous inorganic suspension. The produced emulsion is poured as layer with a defined thickness in the form of any geometry before freezing, an upper surface layer of the emulsion is removed subsequently or after a determined wait time, a further layer of other composition is applied and the process is often repeated. The obtained basic body is coated or infiltrated in green or sintered state, so that the body has a closed porosity in the outer layer and is subsequently dried and sintered.
    Original languageEnglish
    Patent numberDE102008058417-B3
    Publication statusPublished - 18 Feb 2010

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