热喷涂炉底辊使用中的问题和涂层材料开发

42116026O848.5A1007–9289(2004)06–0042–04TheProblemsofCoatedHearthRollsinContinuousAnnealingFurnaceandDevelopmentofaNewCoatingGaoYangInstituteofMaterialsandtechnologyDalianMaritimeUniversity,Dalian116026,ChinaAbstractTheproblemsofhearthrollsincontinuousannealingfurnacewithchromiumcarbide,cobalt-basedalloyandothersoxidescoatingswerediscussed.Theeffectofmanganeseoxidesonthecoatedhearthrollswasalsoanalyzed.Thealuminaandchromiumoxidesonthesurfaceofcoatingsarereactedeasilywithmanganeseoxide,whichresultsinthedamageofcoatingsandtemperatureisakeyfactorinfluencingthepropertiesofcoatingonthehearthrolls.Finaly,anewcoatingbydetonationthermalsprayingforhearthrollusedathightemperaturewasintroduced.Keywords:thermalsprayhearthrollpickupmanganeseoxidecoating0ContinuousAnnealingLines=CAL70HearthrollPRAXAIRSURFACETECHNOLOGYPRAXAIRD–Gun700(NiCr–80%Cr3C2)700(CoTaSiCrAlY+Al2O3)[1]2004–10–132004–10–25(1958–)()CALIF900PRAXAIR[23]CAL––11.1120051(70)43215~101Fig.1Thepickupformedonthehearthrollwithoutcoating2Fig.2ThepickupformedonthehearthrollwithcoatingSiO[4]2SiO21.21.2.11800HV10%Al2O3TaC3~10mAl85051(/%)[5]Table1Compositionofcobaltalloycoating[5]CoCrTaAlYSiCAl2O35425107.50.80.7210IF0.1~0.15%CAL9009003CAL3433Fig.3Hearthrollwithcobalt-basedalloycoating,showingthepeelingoffofcoatingafter3monthsapplication4Fig.4Enlargedmorphologyofhearthrollafter3monthsapplication44[4]900MnAlO4Mn1.5Cr1.5O4CrAlCrAl1.2.2–100%Y2O3CaO–[3]5Y2O3[]5Fig.5ZrO2-8Y2O3coatingonthehearthrollshowingthepeelingoffphenomenon–1nPa–Al2O3–Al2O31.2.3700~800400~500HV820CrO3Cr2O3Cr3C2Cr7C3Cr23C6[2]Cr3C2–20%NiCr8506Cr3C2–20%NiCrN2+%5H28005hXCr7C3Cr2O322.180085020051(70)456Fig.6ComparisonofX-raydiffractionpatternsofCr3C2coatingsatthestatesofas-sprayedandtestedat1073Kfor5hoursMCrAlY+M=CoNiFeNb7ND–12001000N2+%5H2100010hEDAXND–1200ND–1200(a)(b)(c)(d)DN–12007DN–1200Fig.7Microstructureoncross-sectionanddistributionofmanganeseinthecobaltalloycoatingandDN–1200coatingtestingat1273Kfor50hours2.2ND–12007(a)ND–1200600~750HV2%201000–ND–12008138Fig.8Detonationsprayedhearthroll8008505ND–120010ìm46[1]TuckerRC,Jr,NittaH.DetonationGuncoatingcharacteristicsandapplications[C].ProceedingofATTAC88,Osaka,Japan,1988:85-92.[2]HaroldH.Fukubayashi,PresentFurnaceandPotrollCoatingsandFutureDevelopment[C].ITSC2004,Osaka,Japan,2004:23-29.[3]HwangSY,SeongBG.Characterizationofbuild-upresistantplasmaspraycoatingsforhearthrolls,Thermalsprayingcurrentstatusandfuturetrends[C].14thinternationalthermalsprayconference,Kobe,Japan.1995:59-63.[4]YangGao,Hnitta,R.C.Tucker,Jr.Effectofmanganeseoxidesonthedurabilityofacobaltbasedcoatingonfurnacerollincontinuousannealinglines,Thermalsprayingcurrentstatusandfuturetrends[C].14thinternationalthermalsprayconference,Kobe,Japan.1995:53-57.[5]GillBJ,BuckmannHU,NeuhausenR.Presentatthe4thsurfaceconferenceonsurfacetechnology[C].Berlin,Germany,1987:102-109.[]YGao.ReactionofZrO2-CaO-ZrSiO4andZrO2-Y2O3-ZrSiO4detonationthermalsprayedcoatingwithmanganeseoxideat1273K,SurfaceandCoatingTechnology,SCT-10375().116026E-mailgaoyang@mail,dlptt.ln.cnTel(0411)847268958203747013500772351PPPPPPPPPPPPPPPPPPPPPP(41)TiCTiN245s4553PIIIDPIIIDGCr1550%0.80.1~0.32.5h45µsPIIIDPIIID[1],.[M].,1992:1-20.[2]ConradJR,RadtkeJL,DoddRAetal.Plasmasourceionimplantationtechniqueforsurfacemodificationofmaterial[J].J.Appl.Phys,1987,(62):4591-4594.[3],,,.PIII[J].,2002,25(9):691.[4],,.[J].,2000,36(1):49.[5],,,.9Cr18[J].,2000,(4):24-27.[6]ChuPK,TangBY,ChengYCetal.Principlesandcharacteristicsofanewgenerationplasmaimmersionionimplantation[J].Rev.Sci.Instrum,1997,68(4):1495-1498.150001Tel:[phone]E-mail:[e-mail]