Method of producing metal foil from a reactive metal sheet utilizing a hot rolling thermal pack assembly

Abstract

The method according to the invention enables thin metal parts (10), in particular metal foil, to be produced from a reactive metal by means of hot forming. The reactive metal is embedded in a capsule (11), which consists of a second, plastically deformable metal, and release agents consisting of powder particles. The parting agents between the capsule wall and the reactive metal are applied in at least two layers (12, 13), preferably as an aqueous dispersion. The powder particles (e.g. boron nitride) of a first layer (13) which is applied to the reactive metal form an essentially more compact packing than the powder particles (e.g. calcium fluoride) of a second layer (12). The release agent of the second layer is plastically deformable or fluid in a highly viscous manner during the hot forming process. The novel method is less expensive than known methods in which the parting agent is applied by a thermal spraying process.

Dependencies are inferred from the claim text.