金属基纳米-亚微米固体自润滑涂层的性能研究

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1、华中科技大学硕士学位论文金属基纳米/亚微米固体自润滑涂层的性能研究姓名：熊贤武申请学位级别：硕士专业：材料加工工程指导教师：张祥林;王爱华20070119华中科技大学硕士学位论文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华中科技大学硕士学位论文Resultshowsthat,thebondstrengthofHVOFsprayedcoatingsisabout20MPa,tensionfailuretakeplacewithinthesprayedcoating.Thisispartlycausedbythepoorconsistencybetweenbackingandlubricantphases.ThecoatingcontainWS25%hasthe