钛合金TC4表面激光熔覆纳米陶瓷涂层的实验研究

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1、南京航空航天大学硕士学位论文钛合金TC4表面激光熔覆纳米陶瓷涂层的实验研究姓名：赵丹申请学位级别：硕士专业：机械制造及其自动化指导教师：刘志东20080101钛合金TC4表面激光熔覆纳米陶瓷涂层的实验研究AbstractTitaniumanditsalloysarewidelyusedinavigation,aerospaceandchemicalindustryduetotheirexceptionallyphysicalandchemicalpropertiessuchaslowdensity,hig

2、hspecificstrengthandexceptionalcorrosionresistance.Theuseoftitaniumalloysislimitedforitspoorwearresistanceandlowhardness.Theresearchinthisdissertationistoimprovethesurfacepropertiesoftitaniumalloysbyusingsomesurfacetechniques.Thefabricationdesignandtestso

3、fthecoatingswereimplementedTheConventionalmicronstructuredAl2O3+13wt.%TiO2wascomparedwiththenanostructuredAl2O3+13wt.%TiO2inthecoatingmaterialresearch;andlasercladdingwascomparedwiththeplasmasprayinginthetechnicsresearch.Microstructureandcompositionofthec

4、oatingsampleswereachievedbymeansofX-raydiffraction(XRD),scanningelectronmicroscopy(SEM).Microhardness,wearresistanceandbindingpropertieswerealsotestedbythecorrespondingtestfacilities.Theresultsshowthatthepropertiesofthesampleswithceramiccoatingweregreatly

5、improved,andthenanostructuredceramiccoatingwasalsoexhibitedabetterperformancethanthenormalcoating.Inaddition,plasmasprayedcoatingwithlaserremeltingcouldsignificantlyenhancethemechanicalpropertiesbycomparisonwithcoatingwithouttreatment.Keywords:Surfacemodi

6、fication,Lasercladding,Plasmaspraying,Nanostructuredceramic,Claddinglayer,Titaniumalloysii南京航空航天大学硕士学位论文图、表清单图1.1激光熔覆工艺示意图........................................................................................6图1.2等离子喷涂工艺示意图..............................

7、....................................................11图1.3纳米晶材料的微结构图(左)与纳米非晶材料微结构图(右)..........................14图1.4纳米复合涂层的分类......................................................................................16图2.1NiCoCrAl+2Y2O3合金粉末SEM形貌..............

8、.............................................20图2.2陶瓷粉末的SEM形貌....................................................................................22图2.3等离子喷涂设备配置示意图....................................................