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《金屬基納米-亞微米固體自潤滑涂層的性能研究》由會員上傳分享，免費在線閱讀，更多相關內容在學術論文-天天文庫。
1、華中科技大學碩士學位論文金屬基納米/亞微米固體自潤滑涂層的性能研究姓名：熊賢武申請學位級別：碩士專業(yè)：材料加工工程指導教師：張祥林;王愛華20070119華中科技大學碩士學位論文AbstractInthispaper,aseriesofexperimentswerecarriedouttotestthebondstrength,themicrohardness,thefrictioncoefficientandwearresistanceofsolidself-lubricantcoatingswhichwerepreparedbyYAGlasercladandHVO
2、Fspraycraft.TheinfluenceoftheexistenceofNano/sub-micronsizedlubricantphasesonthepropertyofsolidself-lubricantcoatingswasresearchedduringthistest.AspecialapparatuswasdesignedandmanufacturedtopreparethebondstrengthtestsamplesinordertomeasurethebondstrengthoftheHVOFsprayedcoatingseffective
3、lyaswellasaneffectivemethodforevaluatingthefrictioncoefficientandwearresistanceofsolidself-lubricantcoatingsatbothroomtemperatureandhightemperaturewasestablished.Factorswhichinfluencethefrictionandwearpropertyofthesecoatingsareresearched.MicrostructuralanalysisshowsthatalargeamountofM7C
4、3existsinthecoating.LubricantphasesdistributearoundM7C3formasoft-hardalternatestructureinYAGlasercladcoatings.ThemicrohardnessofthiskindofcoatingisHV800orabout,itislowerthanthelaser-cladcoatingpreparedbypureNipowder.ThefrictioncoefficientofYAGlasercladNi60-BNandNi60-WS2coatingsisabout0.
5、37,itisabout30%lowerthanthefrictioncoefficientofYAGlaser-cladpureNi60coating(about0.5~0.6).Atroomtemperature,thewearresistanceofYAGlaser-cladNi60-BNmultiple-coatingisfivetimesorabovebetterthanYAGlaser-cladpureNi60whiletheYAGlaser-cladNi60-WS2multiple-coatingsistentimesorabovebetterthani
6、t.ThewearresistanceofYAGlaser-cladNi60-BNmultiple-coatingisfourtimesorabovebetterthanYAGlaser-cladpureNi60coatingwhiletheYAGlaser-cladNi60-WS2multiple-coatingsisthreetimesorabovebetterthanitat400℃.Nanosolidself-lubricantcoatingsarepreparedwithHVOFspraycraft,Inthisresearchthebondstrength
7、andthefrictionandwearpropertyofthesecoatingsistested.II華中科技大學碩士學位論文Resultshowsthat,thebondstrengthofHVOFsprayedcoatingsisabout20MPa,tensionfailuretakeplacewithinthesprayedcoating.Thisispartlycausedbythepoorconsistencybetweenbackingandlubricantphases.ThecoatingcontainWS25%hasthe
