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1、JTTEE518:380–391DOI:10.1007/s11666-009-9304-71059-9630/$19.00ÓASMInternationalQualityImprovementofFlameSprayed,HeatTreated,andRemeltedNiCrBSiCoatingsZ.BergantandJ.GrumPeerReviewed(SubmittedSeptember17,2008;inrevisedformDecember24,2008)Inthisstudy,proper
2、tiesofNiCrBSicoatings,producedbyatwo-stepprocessofflamedepositionandfurnaceposttreatment,areanalyzed.Adhesionstrength,microstructure,porosity,microhardness,chemicalcomposition,andresidualstresseswereanalyzedafterdepositionandafterheattreatment;thatis,rem
3、elting.Numerousspecimensweremadetostudytheadhesionstrengthofcoatingsafterflamedeposition.Thefourchoseninfluentialfactors,thatis,surfaceroughness,preheattemperatureofthesubstrate,distanceofflametorch,andtypeofoxyacetyleneflame,wereoptimizedtomaximizetheadhes
4、ionstrength,usingtheTaguchiparametricmethod.Theconfirmationexperimentshowedthatthedevelopedexperimentalmodelissuitableforoptimizationofflamesprayingdepositionprocess.Basedontheevaluationofcoatingproperties,thebestoverallqualitywasobtainedafterremeltingata
5、peaktemperature1080°Cwith5minutesofholdingtime,followedbyslowaircooling.spraytechnologies,flamesprayedcoatingsshowrelativelyKeywordsadhesionofTScoatings,hardnessand(visco-)elasticproperties,heattreatmentofcoatings,limitedvalues(Ref1)ofadhesionstrength.Ho
6、wever,influenceofsprayparameters,preheatingofflamesprayingtechnologyisstillwidelyused,andthere-substrates,porosityofcoatings,residualstressforeitisreasonabletoexaminetheefficiencyofmoderndeterminationapproacheswhenimprovingthequalityofcoatings.Themainobjec
7、tiveofthisresearchistoadjusttheinfluentialparametersforvariouscombinationsofthecoating/sub-stratematerialtoimprovetheadhesionstrength.Itiswellknownthatthesubstratepreheatingaffectsthenumerous1.Introductionphysicalfactorssuchasparticlecoolingrate,splatmor
8、-phology,andresidualstressgenerationduringandafterThepowderflamesprayingmethodhasbeenwelldeposition(Ref7-9).Thefinalparticlevelocityisrelatedknownformanydecadesinindustry.Itiscurrentlywidelytothedistancefromthenozzleexittothesubstr
