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《mgal2o4基复合陶瓷材料的微波烧结制备研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、AbstractAnalysisandcalculationofchemicalthermodynamicsduringthesolidphasereactionprocessofMgAl2O4indicatedthathightemperatureandhighenergyconsumptionwasnecessaryinthesynthesizeofMgAl2O4.AndtheconventionalmethodsforpreparationofMgAl2O4consumedalargeamountofenergyandtime.However,microwav
2、esinteringprovideabetterwaytoprepareMgAl2O4becauseofitssomanyadvantagesashighheatingrates,reducedprocessingtime,lowpowerconsumption,lessenvironmentalhazardsandpromotionofuniformphasestructure.Duringmicrowavesintering,largeamountofheatmaybegeneratedforalossymaterialthroughoutthevolume,w
3、hereasforconventionalheating,thematerialisheatedviaanexternalheatsourceandsubsequentradiativetransfer.Inthispaper,firstly,theRFmodule,theheattransferanalysismoduleandthestructureanalysismoduleinthefiniteelementsoftwareHFSSandCOMSOLwereconductedtoestablishareasonablemathematicalmodeland
4、physicalcontrolequation,andthetemperaturecharacteristiccurveofmicrowavesinteringofMgAl2O4wasgot;Secondly,componentofMgAl2O4matrixcompositesceramicswasdesigned,andpreparationoffinepowders,powdercompactsandmicrowavesinteringwereconducted;Finally,characterizationofMgAl2O4andMgAl2O4matrixc
5、ompositesbyXRD,SEMwasconducted.Theresultsshowedthat:1.Thepartoftheorycalculation,for2.45GHzfrequencymicrowave,thecouplingbetweenthemicrowaveelectromagneticfieldandtemperaturefieldwasmadeclear,thatis,thestrongestelectricfieldintensityofmicrowavesinteringappearedatthegeometriccenterofthe
6、cavity,andthecavitywassuitableforsinteringofcylindricalspecimen.ThetemperaturecharacteristiccurveofmicrowavesinteringofMgAl2O4showedthattemperaturerisedmoreslowlyattheearlystep,however,thetemperatureshowedanexponentialincreaseafterashortlatertime.2.MgAl2O4phasecouldbesynthesizedbymicro
7、wavesinteringandconventionalsintering,however,theMgAl2O4grainssynthesizedbymicrowavesinteringappearedfine,smooth,regularanduniformshape,andbecauseoftheincreaseofthelatticeionmobility,theincreaseofdiffusionandsinteringspeed,so,thereduceofthesinteringactivationenergyandthereduceofthesi
