Impac Technologies

Valtubes

Claude Quichaud

Pierre Guy Peytavin

Francois David

Christer Aslund

The process relates to the production of a green from slurry by solidification after injection into a mold having a temperature of less than 0.degree. C. The mold and moveable parts of a jack ensure closure thereof and are housed within a gas-tight vessel. A distributor for dry gas with a dew point lower than the temperature of the mold emits a gas current through apertures. The green is conducted outside the vessel through an aperture which is opened in a continuous or discontinuous manner. The process is applicable to the production of sintered metallic or ceramic parts with high density and high performance mechanical characteristics.

Process for injection molding of slurries

A device for the production of a green from slurry by solidification after injection into a mold having a temperature of less than 0.degree. C. The device includes a mold having a jack wherein moveable parts of the jack ensure closure thereof and which are housed within a gas-tight vessel. A distributor for dry gas with a dew point lower then the temperature of the mold emits a gas current into the vessel through apertures. A chute conducts the green towards an exit aperture and to a receiving member outside the vessel.

Device for injection molding of slurries

The invention is concerned with the production of pieces by powder metallurgy, and, more particularly, the use of powders with spherical particles, such as those obtained by pulverisation, in a gas of a liquid metal or alloy. The metallic powder according to the invention is constituted by granules, each of these comprising an assembly of spherical particles which have been agglomerated by at least 0.5% of gelatin. This powder is prepared by mixing with the spherical particles an aqueous solution of gelatin; a paste is thus obtained which is broken in such a way that granules are obtained by calibration and drying. Application to the production of pieces made of non-oxidising, fire-proof, or other, steels or alloys.

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Ville d'Avray, France

Claude Quichaud