高温自润滑复合材料的制备及摩擦学性能的研究

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1、江苏大学硕士学位论文高温自润滑复合材料的制备及摩擦学性能的研究姓名：姜春华申请学位级别：硕士专业：机械设计及理论指导教师：李长生20070609江苏大学硕士学位论文粒间的Ag微粒起到黏结相的作用，有效抑制裂纹的萌生和扩展，对裂纹起弥合作用。从常温到高温，YBCO／Ag复合材料都表现出优良的摩擦学性能，软金属膜+硬基体足其减摩耐磨机理。由AgN03晶体制备出的复合材料基体内Ag微粒的粒径更小，分布更加均匀，团聚少，宏观上表现出更好的综合性能。关键字：摩擦学行为，固体润滑，金属一陶瓷，YBa2Cu307，镍基合金，复合材料Ⅱ江苏大学硕士学位论文ABSTRACTBecauseoftheo

2、xidizationabove450℃inair,commonsolidlubricantsuchasMoS2andgraphitewillloselubricationaction．Withthedevelopmentofmodemindustry,especiallyaviationindustryandspacetechnology,therearemanypartsandspacedevicesworkingatcriticalcondition,workingregularlyandlifespanofspacedevicesdependonlubricatingstat

3、e．Soresearch＆developnewlubricatesanditscompositeshasmuchvalueinapplicationandtheoryareas．Itisoneofthemostimportantsubjectsintribologyfield．Solidlubricantscanbeusedinmanyroutes，forexamples，coverfilmfabricatedbyadhesives,additationaddedintooilandgrease，compositepreparedwithseveralcomponents．Lubr

4、icsntingfilm'slifespanisveryshon，additationeswillagglomerate，onlycompositescanovercomethesedisadvantages，italsoshowsgoodlubricantingandmechanicalproperties．Therearemanyuncertainelementsaboutcomposi搬suchasthesolutionandmatchingoflubricantsandmatrixes；thegrainsize，distributionandconcentrationofl

5、ubricanm；preparingmethods．Firstly,wefabricatedNi-Crbasedself-lubricanfingcompositebyaddingMoS2andLaF3intoNi-Cralloy．TheresultsshowMoS2filmsgeneratedOilcontactzoneandconteffaceisthemechanismofantifrictionatrOOmtemperature，buttheoxideNiM004insteadathightemperature．Oxidehasgoodlubricamingproperty

6、athightemperature．LikingMoS2andgraphite，Yla2Cu307(YBCO)alsohaslaminatedstructure，butitsoutstandingadvantagesareoxidationandwearingresistance．Italsobelongstooxideceramics,anditsceramicpropertysuchasfrangibilityneedstObeimproved．DopingistheoneofthemostsimpleandhighefficientmethodstOimprovefrangi

7、bilityofceramics．Atpresent,therearcmanyreportsonimprovinggrainbeundaryweak-link,increaseitscriticalcurrentdensity㈣andmechanicalpropertieswithdopingmetals，insteadoftribologicalproperties．Sopayingattentiontotribologicalpropertiescanbroads