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1、ThermodynamicanalysisofTipowdersynthesizedbySHSthermitreactionSciencePressTrans.NonferrousMetSoc.China17(2007)s27一s31Transacti0nsofNonferrousMetalsSocietyofChinaThermodynamicanalysisofTipowdersynthesizedbySHSthermitreactionwww.CSt1.educn/ysxb/ZHANGPeng—lin(张鹏林)一,XIATian—
2、dong(夏天尔)一,ZHANGGuo.dong(张国栋),YANLi-jing(I-~静),ZHAOWen-jun(~文军)1.StateKeyLaboratoryofGansuAdvancedNonferrousMetalMaterials,LanzhouUniversityofTechnology,Lanzhou730050,China;2.KeyLaboratoryofNon—ferrousMetalAlloys,MinistryofEducation,LanzhouUniversityofTechnology,Lanzhou7
3、30050,China;3.CollegeofPowerandMechanicalEngineering,WuhanUniversity,Wuhan430072,ChinaReceived15July2007;accepted10September2007Abstract:Accordingtothethermodynamicstheories,thereactiveGibbsfreeenergies,thereactiveadiabatictemperature,themeltingrateofTiandthegasification
4、massofMgintheMg—Ti0,andAI—Ti0,systemsweretheoreticallycalculatedandanalyzedrespectively.TheresultsshowthatthereactionsofMg—Ti0,andAI—Ti0,areveryeasytotakeplaceandthereactionofproducingvariOUSsuboxidesofTimayoccurinMg—Ti0,andAI—Ti0,reactionsystem:theadiabatictemperatureof
5、M2一TiO,becomeslowerwithincreasingmassfractionofMg.Theadiabatictemperatureisbelowl800KwhenthemassfractionofexcessiveMgexceeds25%:TheadiabatictemperatureofAI.Ti0,alsobecomeslowerwithincreasingmassfractionofAI.butitbecomeshigherwiththepreheattemperatureincrement.Theadiabati
6、ctemperatureplateauistheresultofTimeltingendotherm;owingtothegasificationofagreatdealofMginMg—Ti0,reactionprocess.MgshouldbeproperlyexcessiveinordertogetTi.Keywords:self_propagatinghigh—temperaturesynthesis(SHS);thermodynamicanalysis;adiabatictemperature;Mg—TiO2;AI—TiO21
7、IntroductionSelf_propagatinghigh—temperaturesynthesis(SHS)providesanattractivepromisingalternativetotheconventionaImethodsofproducingtheadvancedmaterialssuchasborides,carbides,silicides,aluminides,andotherintermetalliccompoundsfrompowdermixtureofmetalandnonmetalelements.
8、inrespectthatSHSsuperiorinprocesseconomicsandprocesssimplicity[1—5].ThebasisofstudyingtheprocessofSHSli
