Centre De Recherches Metallurgiques Asbl-centrum Voor Research in De Metallurgie Vzw

Arcelormittal

Sébastien Le Craz

A sol composition for producing dielectric layers on a metallic substrate including 10 to 30%, by weight of the sol composition, of a precursor including a trialkoxysilane, 10 to 40%, by weight of the sol composition, of titanium dioxide particles whose median size is below 500 nm, 4.5 to 36%, by weight of the sol composition, of silica particles whose particle size distribution D90 is below 100 nm, 5 to 15%, by weight of the sol composition, of a solvent capable of making the precursor miscible in water, 0.1 to 2%, by weight of the sol composition, of an acidic catalyst, the remainder being water.

Dielectric coating

The present invention relates to a method for coating a static or moving metal substrate with a simple or complex shape, by means of an ultra-thin mineral/organic hybrid coating layer with a thickness comprised between 50 to 500 nm, deposited on the substrate:

Method for coating a metal surface with a hybrid layer

A method for continuously coating a substrate in motion such as a metal strip made of steel, the coating formed being an ultra-fine film of a thickness between 10 and 100 nm, deposited on the substrate: from a solution containing nanoparticles of oxides, in conditions of controlled pH, said substrate being at a temperature higher than 120&#xb0; C., the total duration of the deposition being less than 5 seconds and preferably less than 1 second, characterized in that at least one chemical additive, called a 'refiner', is incorporated into said solution, said refiner having, mutatis mutandis, the effect of restricting the formation of said coating.

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Liege, Belgium

Sébastien Le Craz