niti球磨时间对冷喷涂沉积效率及组织结构的影响

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1、英文摘要Subject：EffectofNi／TimechanicalmillingtimeonthedepositionefficiencyandmicrostructureofcoldspraycoatingsSpecialty：MaterialProcessingEngineeringName：LiInstructor：ZhouABSTRACTNiTiintermetalliccompoundcailbepotentiallyusedinvariousapplicationssuchaswaterturbines，propellersandotherover-curre

2、ntcomponentduetoitsexcellentcorrosionresistanceanderosionweal"resistanceperformance．Theeffectofdifferentmechanicalmillingtime4hrs，8hrsand14hrsofNi／Tipowderonthecolddepositionrateandcoatingstructurewerestudiedinthispaper．Thisstudycanprovideanovelmethodforfabricationofhigh-performanceNiTiinte

3、rmetalliccompoundcoatingbycoldspraying．TheresultshowsthatthelowtemperaturemechanicalmillingtogetherofNiandTiwasusedtoproduceametastablemechanicalmillingpowderthatWascapableofapplyingforcoldspraying．MechanicalmillingtimesignificantlyaffectsthelayeredstructurethicknessoftheNi／Tipowder．Thelaye

4、rstructurethicknessofthepowderbecomemoreandmoredenseandthehardnessisalsogrowingwiththeincreasingmechanicalmillingtime．TheSHSphenomenonoccurredincoldsprayingmechanicalmillingNi／Tipowder．ThegastemperatureignitingtheSHSreactionduringcoldsprayingdecreasedwithincreasingofballmillingtime．Thethick

5、nessesofcomingsdepositedreducedobviouslywiththeincreasingmillingtimeofNi／Tipowder．ThedepositionefficiencyofNi／TicoatingWassignificantlyinfluencedbytheSHSreaction．Heatingofthecoatingsdepositedfollowingmillingfor4or8hrsuptotemperaturesintotherange900～1050℃bringaboutitstransformationintoNi3Ti，

6、NiTiandNiTi2intermetalliccompoundsandthecoatingwithmillingof14hheatingto600-900。CbringsaboutitstransformationonlyintoNi3TiandNiTi2，NiTiisnotexist．Thetransformationtemperaturesofintermetalliccompoundsphaseincoldsprayedcoatingdeclineevidentlywiththeincreasingofmillingtime．Keywords：Mechanicalm

7、illingtime，Ni／Tipowder,Microstructure，depositionefficiency,Coldspraying，SHSThesis：ApplicationStudyIII学位论文创新性声明本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除了文中特别加以标注和致谢中所罗列的内容以外，论文中不包含其他人已经发表或撰写过的研究成果；也不包含为获得西安石油大学或其它教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均