鎳-納米氧化鑭復(fù)合電鑄試驗研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文鎳納米氧化鑭復(fù)合電鑄試驗研究姓名：趙飛申請學(xué)位級別：碩士專業(yè)：機(jī)械制造及其自動化指導(dǎo)教師：朱荻20040201ABSTRACTCompositeelectroformingisthecombinationofcompositeelectrodepositionandElectroforming，whichisreferredtotheprocessthatsolidparticlesorfibersCOdep

2、ositwithsinglemetaloralloyinelectrolyteCompositeelectroformeddeposithasacompactanduniformmicrostructureMeanwhile，thenanocompositedepositexhibitshirghermicrohardness，andisgreatlyenhmacedinweal“resistance，corrosionresistan

3、cemadhightemperatureoxidationresistanceInthispaper，Ni—llano—lanthanumoxide(La203)compositedepositwasobtainedbyelectroformingfromanickelsulfamatesolutioncontainingLa203nanoparticlesTheeffectsofprocessparametersOntheconcen

4、trationofLa203，morphologymadmicrostructureofthenanocompositedepositwerestudiedFurthermore，mechanismofwearwasdiscussedMicrohardnessmeasurementofcompositelayersWasperformedThefrictionandweal“testsofcompositelayerswerealsoc

5、arriedoutItisfoundthattheconcentrationofembeddedLa203particlesreachesupto31wt％andthecodeposited—La203contentinthecompositedepositismarkedlyaffectedbytheLa20sparticleconcentrationintheelectrolyteandthenthecurrentdensityTh

6、escanningelec廿onmicroscopy(SEM)analysisshowsthattheelectroformeddeposithasamoresmoothsurfaceandamorecompactmicrostructurewiththeincreaseoftheconcentrationofLa203TheelectroformeddeposithasthelesscodepositedLa20scontentand

7、themoreroughcrystalsofNimatrixunderahighcurrentdensityXrayDiffraction(XRD)analysisrevealsthatpreferredcrystallographicorientationofNielectroformeddepositischangedbythecodepositionofnmaoparticlesandNimatrix，whichleadstoth

8、ediversityofperformanceamongtheelectroformeddepositAccording幻themicrohardnesstests，themicrohardnessofthecompositedepositCanreachupto520Hvmicrohardnessofcompositedepositisincreasedby80％，comparedwiththatofpureNidepositMore

9、overfrictioncoefficientandwearrateofcompositedepositnotablyreduceswiththeinereaseoftheLa203concentrationThefrictionandwearpropertiesofcompositedepositaresignificantlyimprovedWiththeincrementoftheconcentrationofLa20sparti

10、cles，wearmodeofcompositedepositisgraduallyshiftedfromadhesionweartoabrasivewearWhentheconcentrationofLa20snanoparticlesreaches31wt％，compositedeposithasasmoothsurfaceandonlyexhibitesslightabrasivewearKeywords：compositeele