Method of preparing aluminas hydrated monolithic aluminas, amorphous or crystalised, aluminates, and of composite materials by oxidation of aluminium or aluminium alloy metallic

摘要

Process (P1) for producing monolithic alumina hydrate (I) comprises cleaning the surface of a piece of aluminum or aluminum alloy, coating the surface with a mercury amalgam of a noble metal, and exposing the coated surface to a wet oxidizing atmosphere. Independent claims are also included for: (1) process (P2) for producing monolithic amorphous alumina by heating (I); (2) process (P3) for producing monolithic crystalline alumina (II) in delta, gamma, theta, kappa, kappa' or alpha form by heating (I); (3) process (P4) for producing a monolithic aluminate (III) by impregnating (I) or (II) with a metal compound and heating the product to decompose the metal compound and form the aluminate; (4) process (P5) for producing a composite material comprising (I), (II) or (III) and another compound or element (IV) by impregnating (I), (II) or (III) with a precursor of (IV) and then forming (IV).