feal渗层的低温制备及其机理研究

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1、浙江大学硕士学位论文phaseCallnotbeobservedatthesurfaceofFesubstrate．TheFeAl6phaselayeronthe1Crl7subatratecangrowintoabout7pinofthicknessin25min．ThemaximumthicknessesofFeAl3phaseandFe2Alsphaseareabout9pmand16Inninbothsubstrates．Whilethethicknessesof．FeAlphaseobservedatthesurf

2、．aCesoftwosubstratesarequitedifferent，thereare4pmatthesurfaceofFesampleandthethicknessofFeAllayeratthesubstrateof1Crl7Cannotbemeasuredunderopticalmicroscopy．TherelationshipsbetweenthethicknessesoftheseFe-A1phaselayersandtreatingtimeinbothsubstratesshowedthatthegrow

3、thbehaviorsofFeAl6，FeAl3andFeAlphasesarecontrolledbyvolumediffusionOVergrainboundrydiffusion，whilethegrowthbehaviorofFe2A15phaseiscontrolledbygrainboundrydiffusion．ThegreatamountofCratomsin1Crl7subatratewillhinderthetransformationbetweenthesesFe-A1phasesandlowerthe

4、growthrateoftensileFeAlphaselayergreatly．Finally,theA1coatingaluminizingmethodWasappliedontheoilcasePl0gradesteeltopr印arethetensileFeAlcoatingatlowtemperature．OutcomeindicatedthattherateofaluminizingwasnotablyincreasedwhenthediffusiontemperatureisOVer590℃，whilethem

5、echanicalpropertyofsubstratematerialCanbekeptundertreattemperatureof620℃．ThetensileFeAlcoatingabout8岬thickessWasobtainedbyelectrodepositionof6pmA1coatingfollowedbyheattreatmentat620’Cfor24h．Keywords：aluminidecoating，aluminizing，thermo-feasibility,reactiondiffusion，

6、growthbehavior,tensileFeAlphase，P10steel．目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯III第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2Fe．趾渗层研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．2．1F

7、e-A1渗层的相组成及性能⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．2．2Fe-A1合金渗层的制备方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．2．3Fe．Al合金渗层的电沉积法制备⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．3低温渗铝方法研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．51．3．1低温渗铝方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．51．3．2低温渗铝机理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．71．4韧性FeAl渗层低温制备的研究现状⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯91．4．1FeAl渗层的低温制备⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．91．4．2FeAl相渗层低温制备机理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．91．5课题的提出及其意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．91．5．1韧性FeA