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6601000MW超超临界喷嘴叶栅耐磨涂层研究.docx

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6601000MW超超临界喷嘴叶栅耐磨涂层研究 Abstract Thedevelopmentofultra-supercritical(USC)powerplantshasledtohighertemperaturesandpressuresinthesteamcycle,whichhasresultedingreaterwearandtearontheturbinecomponents.Theuseofwear-resistantcoatingsonnozzlebladeshasbecomeanimportantareaofresearchasameansofextendingthelifeofthesecomponents.Thispaperfocusesontheresearchintothedevelopmentofwear-resistantcoatingsfornozzlebladesin660MWultra-supercriticalpowerplants,withparticularattentiontotheuseofthermalsprayingtechniquestoapplythecoatings. Introduction Withtheincreasingdemandforenergy,ultra-supercriticalpowerplantshavebecomemorecommon.Thesepowerplantsoperateathighertemperaturesandpressuresthantraditionalpowerplants,whichmeansthattheircomponentsaresubjecttomorewearandtear.Inparticular,thenozzlebladesintheturbinesaresubjecttoerosionandwear,whichcancauseseriousproblemsintheoperationofthepowerplant. Inordertoaddressthisissue,researchershavebeendevelopingwear-resistantcoatingsfornozzleblades.Oneofthemostpromisingtechniquesforapplyingthesecoatingsisthermalspraying,whichallowsforthedepositionofcoatingswithhighhardness,goodwearresistance,andgoodadhesiontothesubstrate. Thispaperlooksattheresearchintothedevelopmentofwear-resistantcoatingsfornozzlebladesin660MWultra-supercriticalpowerplantsusingthermalsprayingtechniques. ThermalSprayingTechniques Thermalsprayingisafamilyofcoatingdepositiontechniquesthatinvolvessprayingacoatingmaterialontoasurfaceusingahigh-velocitystreamofgasorliquid.Themostcommonlyusedthermalsprayingtechniquesincludeplasmaspraying,flamespraying,andhigh-velocityoxy-fuel(HVOF)spraying. Plasmasprayingproducesthemostwidely-usedwear-resistantcoatingsduetoitsabilitytoproducecoatingswithhighmeltingpointsandlowporosity.Flamesprayingisusedforcoatingswithlowermeltingpoints,whileHVOFsprayingproducescoatingswithveryhighdensityandgoodbondingtothesubstrate. CompositionofCoatings Theidealcompositionofnozzlebladecoatingsshouldbehard,wear-resistant,andabletowithstandhightemperaturesandpressures.Themo