Abstract: The finishes of the present invention consist essentially of metal alloys having the general formula:T.sub.a Cr.sub.b Zr.sub.c B.sub.d M.sub.e M'.sub.f X.sub.g I.sub.h (I)in which a+b+c+d+e+f+g+h =100 atomic percent;T is Ni, Co, Ni--Co or any combination of at least one of Ni and Co with Fe, wherein 3<Fe<82 at. % and 3<a<85 at. %;M is one or more elements of the group consisting of Mn, Cu, V, Ti, Mo, Ru, Hf, Ta, W, Nb, Rh, wherein 0<e<12 at. %;M' is one or more rare earths, including Y, wherein 0<f<4 at. %;X is one or more metalloids of the group consisting of C, P, Ge and Si, wherein 0<g<17 at. %;I represents inevitable impurities, wherein h<l at. %, and 5.ltoreq.b.ltoreq.25, 5.ltoreq.c.ltoreq.15, and 5.ltoreq.d.ltoreq.18.Powders obtained from these alloys that are deposited on substrates by thermal projection provide finishes having increased hardness in addition to high ductility and excellent resistance to corrosion.
Type:
Grant
Filed:
June 1, 1994
Date of Patent:
June 6, 1995
Assignee:
Neypric
Inventors:
Jean-Marie Roman, Jean-Marie Dubois, Philippe Plaindoux, Jean-Pierre Houin
Abstract: This invention relates to a device for controlling and synchronizing the guide vanes of a distributor of hydraulic machines, particulalry of turbines, which comprises ramps borne by spaced apart radial tabs secured with the synchronization ring. Each lever fitted angularly on the journal of each guide vane presents a free end which cooperates with the corresponding ramp by a roller. The profile of the guide vanes is such that the hydrodynamic force tend to close them.