Manufacture of green compacts from Na-β-aluminate

A method for manufacturing sinterable green bodies from sodium-β-aluminate- and/or precursor-particles bonded via binders, said method comprising:

• providing a casting mold formed from aggregate particles bonded with organic and/or inorganic binders, wherein the casting mold is provided by pouring a pourable mixture comprising the aggregate particles and the organic and/or inorganic binders into a negative of the casting mold and, after a partial setting and drying of the pourable mixture, removing the casting mold from the negative and drying it further;
• introducing a castable slip containing the sodium-β-aluminate- and/or precursor-particles as well as dispersants and binders into the casting mold and, after solidification, demolding it as a sinterable green body;
• and
• reusing the casting mold, wherein
• the castable slip is an aqueous suspension,
• the aggregate particles are particles of polyethylene glycol, titanium oxide, aluminum oxide, sodium aluminate or silicate, or mixtures thereof,
• the inorganic binders are cementitious mixtures containing lime, and
• the organic binders are selected from epoxy, phenolic, or polyester resins.