Hydro-quebec

Michel Trudeau

Robert Schulz

Jean-Yves Huot

Estelle Potvin

Julian Cave

Francois Allaire

Georges Houlachi

Robert Lacasse

François Allaire

Amorphous FePMfoil, preferably in the form of a free-standing foil, process for its production by electrodeposition or electroforming of an aqueous plating solution, and its uses as a constitutive element of a transformer, generator, motor, pulse applications and magnetic shieldings. 'a' is a real number ranging from 13 to 24, b is a real number ranging from 0 to 4, and M is at least one transition element other than Fe. The amorphous FePMfoil has the properties of being amorphous as established by the X-ray diffraction method, an average thickness greater than 20 micrometers, a tensile strength in the range of 200-1100 MPa, an electrical resistivity of over 120 &#x3bc;&#x3a9;cm, and at least one of a high saturation induction (B) greater than 1.4 T, a coercive field (Hc) of less than 40 A/m, a loss (W), at power frequencies (60 Hz), and for a peak induction of at least 1.35 T, of less than 0.65 W/kg, and a relative magnetic permeability (B/&#x3bc;H) greater than 10000, for low values of &#x3bc;H.

Amorphous Fe100-a-bPaMb alloy foil and method for its preparation

There are described powders comprising agglomerated nanocrystals of an electroactive alloy and oxygen. The main component of the alloy can be of nickel, cobalt, iron or mixtures thereof while the alloying element is one or more transition metals such as Mo, W, V, the alloy also including oxygen. Preferably the nanocrystals will be made of an alloy of nickel, molybdenum and oxygen. An electrode which is used by compacting the powders is also disclosed. Also disclosed, is a process for producing the powders by providing particles of nickel, cobalt and iron or oxides thereof with particles of at least one transition metal, (Mo, W, V) or oxides thereof and subjecting the particles to high energy mechanical alloying such as ball milling under conditions which include oxygen and for a sufficient period of time to produce a nanocrystalline alloy. Electrodes produced from these powders have an electrocatalytic activity for the hydrogen evolution which is comparable or higher than the electrodes which are presently used in the electrochemical industry. Moreover, these materials present an excellent chemical, electrochemical and mechanical stability. When use as a cathode the powders are useful in water electrolyzers, in chlor-alkali or the like cells.

Process of preparing nanocrystalline powders of an electroactive alloy

There are described metallic powders comprising agglomerated nanocrystals of an electroactive alloy. The main component of the alloy can be of nickel, cobalt, iron or mixtures thereof while the alloying element is one or more transition metals such as Mo, W, V. Preferably the nanocrystals will be made of an alloy of nickel and molybdenum. An electrode which is used by compacting the powders is also disclosed. Also disclosed, is a process for producing the metallic powders by providing particles of nickel, cobalt and iron with particles of at least one transition metal, (Mo, W, V) and subjecting the particles to high energy mechanical alloying such as ball milling under conditions and for a sufficient period of time to produce a nanocrystalline alloy. Electrodes produced from these powders have an electrocatalytic activity for the hydrogen evolution which is comparable or higher than the electrodes which are presently used in the electrochemical industry. Moreover, these materials present an excellent chemical, electrochemical and mechanical stability.

Process for making nanocrystalline metallic alloy powders by high energy

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Longueuil, Canada

Michel Trudeau