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1、沈阳理工大学硕士学位论文AbstractThisthesisstudysparameteroptimizationoftheequipmentofresistanceonlinedetectionandtheinfluenceofthecontentchangesofmagnesium、strontiumandtitaniuminliquidAluminumalloy.Bychangingthedetectingdiameterofprobesandtestingvoltages,wedeterminetheoptimaldiameterand
2、voltage.Respectively,bychangingthecontentofmagnesium、strontiumandtitanium,weresearchhowthechangesinfluencetheresultsofonlinedetection.Experimentalresultsshowthatat720℃,withincreasingdiameter,thedetectedcurrentvaluegrows,insteadthesensitivitylowers,howeveraccuracyisnotaffecte
3、d.Withtheincreaseofvoltage,thecurrentincreasesinthedetectingsystem.Providingthatthesamediameterinclusionsgothroughindifferentdetectingvoltage,wewillfindthemorethedetectingvoltagethegreaterthechangeofcurrentvalueandsensitivity.Increasingmagnesiumcontentofalloyelementschangesc
4、lusteredAl2O3intoMgO·Al2O3(magnesiumaluminumspinel)whichissmallsizeandsleekedge.Italsoincreasesthenon-metallicinclusioninmoltenaluminum,whichfrequentlyresultsinthedetectingcurrentfluctuation.ThenitmakesAl2O3tightfilmloosenandabsorbsmorehydrogeninmeltedaluminum.OwingtoMgOcont
5、entadding,theviscosityofmeltedaluminumincreases,sotheconductivityofmeltedaluminumreducesandcurrentplatformlowers.TheamountofliquidaluminumthatgoesthroughtheESZdecreasesunitoftime,whichaffectsthedetectingefficiency.Srmodificationcombineswithoxygeneasily,soSrOimpuritywhichcaus
6、esdistortionofAl2O3latticesisformed.Besides,theformationofdefectsandthedestructionofAl2O3filmdensenessincreaseshydrogenabsorbedandliquidaluminumoxidized,resultinginthedetectingcurrentvalueofcontinuouschanges.WiththeadditionoftitaniumcontentandthenumberofTiA13secondphaseparti
7、cles,continuoussmallchangesofthecurrenthappen.Whentitaniumcontentcomestoacertainamountortheholdingtimeisextended,TiA13gatheringandTiA13growingaffectchangesinthedetectedcurrentvalue.Keywords:resistancemethod,inclusiondetection,parameteroptimization,magnesium,沈阳理工大学硕士学位论文stron
8、tium,titanium目录目录第1章绪论.....................................................
