JIUJIANGUNIVERSITY毕业设计题目超音速火焰喷涂TiB2-25Ni涂层组织结构与耐磨性研究英文题目ResearchonMicrostructureandWear-resistingPerformanceofTiB2-25NiCoatingsPreparedbyHighVelocityOxy-fuelSpraying院系机械与材料工程学院专业材料成型及控制工程姓名李琪年级2009（机材A0951）指导教师陈枭二零一三年六月摘要实际生产中，磨损作为工件失效的主要失效形式之一，它所造成的经济损失是十分巨大的。因此，提高工件的耐磨性延长工件的使用寿命，对于节约生产成本提高生产效率都具有非常重要的意义。目前采用制备表面耐磨涂层来抵抗磨损已成为发展热点。金属陶瓷复合涂层既具有陶瓷的高硬度、耐磨损、耐高温、抗氧化和高的化学稳定性，又具有金属的高韧性和可塑性，是一种较为理想的涂层材料。作为一种特异高温性能的功能材料，TiB2的烧结与喷涂却十分的困难，并且难以获得大厚度（毫米级）的、结合牢固的致密涂层。超音速火焰喷涂作为一种制作高质量涂层的表面强化技术，具有涂层致密及结合强度高等特点，越来越受到国内外各界的重视。本文采用超音速火焰喷涂技术在Q235钢基体上制备了TiB2-25Ni涂层，并用ML—100型磨粒磨损试验机测试了涂层的抗磨粒磨损性能。结果表明：在相同的实验条件下，TiB2-25Ni涂层的耐磨性比Q235钢好，这表明TiB2-25Ni涂层具有优异的耐磨粒磨损性能。【关键词】超音速火焰喷涂；TiB2-25Ni涂层；耐磨；显微硬度AbstractInpractice,wearingmakesalargeamountoflostinindustryproduction，itwasusedasoneofthemainformsofexpiration.Therefore，howtoimprovethewear-resistanceandincreasetheservicelifeofthecomponentswasverymeaningful，alsoitsavedthecostandimprovedtheproductionefficiency.Itbecameakeystonetofabricatetheanti-wearcoatingsonthesurfaceoftheworkpieces.Ceramiccompositecoatingshadhighhardness,wearresistance,hightemperatureoxidation,corrosionresistanceandhighchemicalstability.Theyalsohadhightoughnessandplasticity.Therefore,itwasaperfectcoatingmaterial.Asatypicalborideceramics,TiB2ceramicshasbecomearesearchedhotpointbecauseofitshighmeltingpoint,goodchemicalstability,highhardnessandgoodresistancetoabrasion.Asanewtechnologyofproducinghighqualitycoating,HVOFsprayingisputtinganimportantpositionallovertheworld,combinedwithcompactandhighstrengthcoatedcharacteristicandthesprayingpowderisakeyofthethermalsprayingtechnology.Inthispaper,TiB2-25NicoatingsweredepositedbyHVOFonQ235steelsubstrateanduseML-100typeabrasiveweartestingmachinetotestthecoatingAbrasiveperformance.Theresultsshowedthat:inthesameexperimentalconditions,TiB2-25NicoatingwearresistanceismorethanQ235steelsubstance,whichindicatesthatTiB2-25Nicoatinghasexcellentabrasivewearresistance.【Keywords】HVOF；TiB2-25Nicoatings；wear-resisting；microhardness目录前言······························································1第一章概论························································21.1超音速火焰喷涂技术概述···············································21.1.1HVOF喷涂的原理···················································21.1.2HVOF喷涂的优缺点·················································31.1.3涂层与基体的结合机理··············································41.1.4涂层结合的影响因素·················································41.2TiB2涂层的...
