Battelle Memorial Institute

Les Fabriques D'assortiments Reunies

Les Fabriques D'assortiments Reunies-div. R

Nivarox S. A.

Wilfried Kurz

Remi Glardon

Guido Walt

Benno Lux

Jean-Claude Hubert

Pierre Ramoni

Francois Mollard

Luc Espic

Magnetic alloys of a ternary composition as defined within the region A, B, C, D of the ternary diagram of FIG. 5, wherein X is one or more metals selected from the group which consists of iron, nickel, aluminum, copper, molybdenum and manganese and preferably includes 0.1 to 10% atomic (most advantageously 1 to 5% atomic chromium of the entire alloy), are cast and rendered ductile by the formation within the material during solidification of at least two phases. One of the phases is preferably ductile and formed essentially of fibers or dendrites of Co and the other phase or phases are from those normally found in rare-earth/cobalt magnets. The alloy is magnetically hardened by precipitation hardening. The chromium appears predominantly in the fiber or dendrite phase and promotes the formation of the latter.

Directionally solidified ductile magnetic alloy

The invention relates to an improvement of a manufacturing process for making a filament directly from a molten material. The process consists of the ejection of a liquid filament which solidifies in air by making a rotating disc touch the surface of a liquid. The improvement consists in the stabilization of the meniscus which appears upon the wheel near the surface of the liquid and thereby fixing the point where the filament leaves the wheel in order to obtain a constant cross section of the filament. The meniscus is stabilized by the interposition of a body: a rod or a convex piece of a material which does not react with the melt.

Apparatus and process relating to manufacturing of a filament directly

Magnetic alloys of a ternary composition as defined within the region A, B, C, D of the ternary diagram of FIG. 5, wherein X is one or more metals selected from the group which consists of iron, nickel, aluminum, copper, molybdenum and manganese, are cast and rendered ductile by the formation within the material during solidification of at least two phases. One of the phases is preferably ductile and formed essentially of fibers or dendrites of Co and the other phase or phases are from those normally found in rare-earth/cobalt magnets. The alloy is magnetically hardened by precipitation hardening.

Directionally solidified ductile magnetic alloys magnetically hardened

A metallic alloy is cast in a mold to produce a solid body by unidirectional solidification. The alloy, initially in a molten state, is cast into a mold and is completely and progressively cooled in the mold while a unidirectional thermal gradient superimposed thereon parallel to a direction determined by the configuration of the mold (predetermined direction) until a metastable equilibrium is reached in which the entire body of the melt is in a super-cooled state as a homogeneous liquid. The equilibrium is then broken to cause solidification of the alloy and the formation of dendritic crystals with their principal axes parallel to the thermal gradient substantially instantly and without noticeable advance of a solidification front across the melt.

Casting process with instantaneous unidirectional solidification

Growing community of inventors

Lausanne, Switzerland

Wilfried Kurz