江苏科技大学2012届毕业设计（论文）加中间层钛合金与石墨接触反应焊工艺研究系部：机械与材料工程专业名称：材料成型及控制工程班级：08428151学号：0842815131作者：张宁指导教师：祁凯二零一二年六月江苏科技大学本科毕业论文加中间层钛合金与石墨接触反应焊工艺研究Studyofcontactreactionweldingprocessbetweentitaniumandgraphitewiththeinterlayerofalloy摘要本课题研究的是石墨和TC4合金的真空钎焊工艺，观察并且分析了钎焊温度分别为980℃、1000℃在不同中间层及不同的保温时间下的焊缝区域的微观组织和接头区域成分。借助于扫描电镜和能谱分析等分析测试手段，分析了接头的微观组织结构。通过分析各元素的含量分布，及在不同加热温度和不同保温时间的元素分布曲线，我们知道接头成分为Ti/C化合物、Ti/Ni化合物、游离态石墨、（α+β）钛合金。结果表明：(1)在其他工艺参数不变的情况下，加热温度越高，试样的扩散层越大，焊缝则越窄。(2)在其他工艺参数不变的情况下，保温时间越短，扩散层就越大。最终确定石墨/TC4合金的接触反应焊接合适的焊接工艺参数为：当中间层是Ni箔时，加热温度980℃，保温时间3min；当中间层是Cu/Ni箔时，加热温度980℃，保温时间0.5min。关键词：石墨；TC4；接触反应焊；界面组织AbstractResearchonthissubjectisgraphiteandTC4alloyvacuumbrazingtechnology,itmainlytakesstockofthemicrostructureandthecompositionofthetie-inon980℃,1000℃withdifferentheatpreservation.hemicrostructureofthejointsisanalyzedbyscanningelectronicmicroscopy(SEM)equippedwithenergydispersespectrum(EDS).TheattachmentingredientistheTi/Ccompound,Ti/Nicompound,thefreestategraphite,(α+β)thetitaniumalloy.Theresultshowedthat:withtheotherparameternochanging,thewidthoftheweldinglinewillreducewiththeheatpreservationincreasing;thethicknessofthediffusionwillincreasewiththeheatpreservationincreasing;selectingtheweldingtemperatureshouldbeinaccordancewiththeliquidline.Ultimatelythegraphite/contactreactionofTC4alloyweldingsuitableweldingparametersasfollows:WhenthemiddlelayerofNifoil,theheatingtemperatureof980℃,holdingtimeof3min;whenthemiddlelayerofCu/Nifoil,heatingtemperatureof980℃insulationtime0.5min.Keywords:graphite;TC4alloy;Contactreactionwelding;interfacemicrostructure目录第1章绪论..............................................11.1接触反应焊的意义..................................................11.2石墨的材料特性....................................................11.2.1石墨的应用及用途..............................................21.3钛合金的特性......................................................41.3.1TC4的特点.....................................................51.4连接石墨与异种材料方法选择........................................61.5使用真空钎焊的原因................................................81.5.1真空钎焊原理..................................................81.5.2真空钎焊的优缺点..............................................91.6石墨与钛合金的钎焊技术研究.......................................111.7石墨和TC4合金接触反应的目的及意义...............................111.8本课题研究内容...................................................11第2章实验材料、设备和方法.............................122.1实验材料.........................................................122.2实验设备.........................................................122.2.1观察及分析设备...............................................132.3实验过程.........................................................142.3.1试样处理.....................................................142.3.2金相试样制备..................
