METHOD FOR DAMPING VIBRATIONS IN A STEAM TURBINE AND LOW COEFFICIENT OF FRICTION, WEAR RESISTANT COATING FOR STEAM TURBINE BLADE CONTACT AREAS

A coating material defined by a low coefficient of friction, wear resistant coating material is provided to the contacting surfaces of adjacent turbine blades in order to increase the vibration damping provided at the contacting surfaces. In particular, the coating material reduces the coefficient o...

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Bibliographische Detailangaben
Hauptverfasser:	RAJAGOPALAN, SUDHIR, SETH, BRIJ, B, SHEEHAN, KEVIN, C
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL HEATING INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES ORMATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHERTHAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION WEAPONS
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Beschreibung
Zusammenfassung:	A coating material defined by a low coefficient of friction, wear resistant coating material is provided to the contacting surfaces of adjacent turbine blades in order to increase the vibration damping provided at the contacting surfaces. In particular, the coating material reduces the coefficient of friction at the adjacent contacting surfaces of snubber and/or shroud regions defined between turbine blades, where additional vibrational energy is absorbed by increased relative movement of the adjacent contacting surfaces. The coating material may be formed of a conventional wear resistant composition having an additive formed by a lubricating material. L'invention concerne un matériau de revêtement défini par un faible coefficient de friction et sa résistance à l'usure, appliqué sur les surfaces de contact d'ailettes de turbine adjacentes afin d'augmenter l'amortissement des vibrations au niveau des surfaces de contact. Le matériau de revêtement permet, en particulier, de réduire le coefficient de friction au niveau des surfaces de contact adjacentes des zones d'amortissement et/ou de carénage définies entre les ailettes de la turbine, où une énergie vibratoire supplémentaire est absorbée par un mouvement relatif plus important des surfaces de contact adjacentes. Le matériau de revêtement peut être formé d'une composition résistant à l'usure classique contenant un additif formé par un matériau lubrifiant.