空氣—甲烷氮碳氧多元離子共滲工藝的研究.pdf

1、分類號TG31番級公玨學號20040902012彳屈大季碩士學位論文論文題目：空氣一甲烷氮碳氧多元離子共滲工藝的研究論文作者：王鐵裳嘉、紫#親筆蓉：周上祺教授重慶大學申請學位級別：碩士專業(yè)名稱：材料學論文提交日期：2006年10月10目答辯日期：2006年11月22日學位授予單位：重慶大學授位日期：2006年月日答辯委員會主席：盛光敏教授論文評閱人：鄭林高工劉守平副教授2006年10月10日重慶大學碩士論文英文摘要ABSTRACTini

2、ndustrymostoffailuresofmachinepartsoftenbeginfromtheirsurfaces，SOitisimportanttoexplorenewsurface—strengtheningtechnologiesinordertoimprovetheirdurabilityIonnitriding，whichisathermochemicalprocesstoimprovethewearfatiguea

3、ndcorrosionresistanceofavarietyofengineeringsteels，iswidelyusedformodemindustriesThetreatmentinvolvestheintroductionofactivenitrogenatomsintothecomponentsurfacetoproduceamodifiedlayegconsistingofalloutercompoundlayeranda

4、ninnerdiffusionlayerRecentlNresearchanddevelopmentofcombinedprocessesonthebasisofionnitridingarefocusinthisareaAir，inwhichthecontentofN2is79％，istheoptimalnitricoriginofionnitridingTheionN—C一0multicomponentpermeationisnew

5、processthatutilizedthemixedgasofmethaneandairastheactiveN、C、OatomsproviderIntroducingairintoionheattreatmentisingeniousandboldInthispaper40Crsteelsamples、veretreatedbyTheionN—C—OmulticomponentpermeationTheconstitutionofp

6、hases，themicrostmctureandthepropertiesofthemodifiedlayerswereanalyzedusingMicroscopyX—RayDiffraction(XRD)，ScanningElectronMicroscopy(SEM)，MicrohardnessApparatusandHQ一1WearingMachine，andwerecomparedwiththosetreatedbyconve

7、ntionalnitridingThemechanismoftheionNC—OmulticomponentpermeationisdiscussedintheendofthisarticleTheresultsinthispaperarefollowing：(1)LikingordinaryionnitridinglayertheionN—C—Omulticomponentpermeationlayerismadeupofthecom

8、poundlayeronthesurface，thediffusedlayerinthehypo—surfaceandthematrix(2)Themaxharnessof40Cr’SionNC0multicomponentpermeationlayeris540HV02AsCH4increases，themaxharnessheighterlsfirstandthenfalls(3)Inthe40CrionN—C—Omulticomp

9、onentpermeationlayerthemainphasesarenitride、carbideandoxideAsCH4increases，oxideandnitridereducegradually，andcarbideincreases。(4)TheCH4playstherolesofcounteractingtheoverabundanceoxygen’Snegativeeffectandprovidecarbonprev