Gec Alsthom Neyrpic

Neyrpic

Alstom Power Hydro

Neypric

Jean-Marie Roman

Jean-Marie Dubois

Gerard Bienvenu

Jean-Pierre Houin

Philippe Plaindoux

Jurgen Gauger

Georges Rossi

Louis Finet

The invention concerns a Pelton turbine wheel comprising a rim ( ) and several buckets ( ) distributed at the rim periphery, characterised in that it comprises at least a ring-shaped flange ( ) integral with the rim and provided with housings ( ) for receiving the buckets. The flange is capable of absorbing at least part of the efforts transmitted by the buckets ( ) to the rim ( ) and forms a peripheral strip ( ) at external radial zones of the housings ( ). The transmission of the efforts from the buckets ( ) to the wheel rim ( ) is carried out without generating too considerable a concentration zone of mechanical stresses.

Turbine wheel and pelton turbine equipped with same

The subject composite materials comprise an association of an organic elastic matrix with a network of non-oxidized quasi spherical particles, of submicronic dimension and of a diameter ranging between 0.1 .mu.m and 10 .mu.m, distributed uniformly in the matrix. The materials are intended to coat pieces subjected to the phenomena of wear, erosion, cavitation and abrasion notably in a corrosive medium. According to a method of manufacture of these composite materials, the nonoxidized submicronic particles are, immediately before their introduction in the organic matrix, plunged into an organic macromolecular dispersant chosen of such type that the macromolecular chains of the dispersant are fixed on the surface of the particles by noncovalent bonds.

Composite materials resistant to wear and a process for their manufacture

The subject composite materials comprise an association of an organic elastic matrix with a network of non-oxidized quasi spherical particles, of submicronic dimension and of a diameter ranging between 0.1 .mu.m and 10 .mu.m distributed uniformly in the matrix. The materials are intended to coat pieces subjected to the phenomena of wear, erosion, cavitation and abrasion notably in a corrosive medium. According to a method of manufacture of these composite materials, the nonoxidized submicronic particles are, immediately before their introduction in the organic matrix, plunged into an organic macromolecular dispersant chosen of such type that the macromolecular chains of the dispersant are fixed on the surface of the particles by noncovalent bonds.

The finishes of the present invention consist essentially of metal alloys having the general formula:

Method for forming a wear and corrosion resistant metallic finish on a

Amorphous alloy-based metallic finishes having wear and corrosion

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Echirolles, France

Jean-Marie Roman