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1、Wear260(2006)10201027Cavitationerosionofplasma-sprayedNiTicoatingsJ.Stellaa,∗,E.Schuller¨b,C.Heßinga,O.A.Hamedb,M.Pohla,D.Stover¨baInstitutf¨urWerkstoffe,Ruhr-Universit¨atBochum,44780Bochum,GermanybIWV-1,ForschungszentrumJ¨ulich,52425J¨ulich,GermanyReceived16August
2、2004;receivedinrevisedform2June2005;accepted27June2005Availableonline8August2005AbstractNi-Tiprotectivelayersareunderdevelopmenttoincreasethecavitationresistanceofmaterialssuchasstainlesssteel.Forthepresentwork,layerswereobtainedbyvacuumplasmaspraying(VPS)frombothe
3、lementalpowdermixturesandpre-alloyedpowder.Characterizationwasdonewithrespecttophaseformationandimpuritycontent.Cavitationerosionresistancewasexaminedusingastandardultrasoniccavitationtest.Inthecoatingfromthepre-alloyedpowder,ahigherresistanceduetothelowerpresenceo
4、fnon-shapememoryphaseswasobserved.Thecavitationerosionresistanceofpre-alloyedplasma-sprayedlayersisingoodagreementwiththeoneofpore-freeNiTisamplesevaluatedinthisstudyandothersdescribedintheliterature.©2005ElsevierB.V.Allrightsreserved.Keywords:Cavitationerosion;NiT
5、i;Plasma;Coatings1.IntroductionDuringthepastdecade,materialsofhigherosionresis-tancehavebeendeveloped,e.g.alloysthatexhibitmartensiticThetermcavitationisderivedfromtheLatinwordtransformationsuchasHadfieldsteelsandshapememorycavus(hollow).Intechnicalterms,itmeansvoid
6、forma-alloys(SMAs).OnepromisingcandidateisNiTi,aSMAtioninnon-boilingfluidmedia.Theformationofbubblesknownforitsoutstandingproperties.Itshowshighresistanceoccursbecauseofthepressurereductioninafluidbelowtowearaswellastocavitationerosionwithexception-acriticalvalue.Ass
7、oonasthebubblesreachacriticalallylongincubationperiods(elapsedcavitationtimewith-overpressure,theirimplosiontakesplace.Ifthebubblesoutmeasurablemassloss)[16].Thisfeaturerelatedtothecollapseclosetoasolidsurface,thematerialsurfacewillshapememoryeffecthasbeenunderstoo
8、dbythecapacitybesubjectedtothelocaldissipationofalargedensityofofthesematerialstoabsorbenergyduringbubblecollapses.energy.ForwearapplicationsinSM
