大型感应炉用干式捣打料性能的分析

大型感应炉用干式捣打料性能的分析

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时间:2019-02-19

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1、第1I页武汉科技大学硕士学位论文AbstractWiththecontinuousdevelopmentandprogressofmetallurgy,theinductionfurnace,withitsflexible,energysavingandhighefficiency,hasbeenwidelyusedinthefoundryindustry.However,theaveragefurnacelifeexpectancyofdomesticlarge—scaleinductionfurnaceliningisnothi曲,andtheimport

2、eddryrammingmaterialsforinductionfurnaceareexpensive,whichisdifficultforgeneralUSerStosupportforlongandseriouslyhamperedthedevelopmentofrefiningtechnology.Inthispaper,thedryrammingmaterialwaspreparedbycorundum,whitecorundum,c【·A1203powderand97fusedmagnesiaasthemainrawmaterials,andth

3、enwestudiedtheeffectsofthesizecomposition,thecontentandtypeofsinteringaid,andthesinteringtemperatureonitspropertyaswellasthereactionkineticsbetweenthepowders.Theconclusionsareasfollows.(1)Thevalueofqhaslittleeffectonthecompressivestrength,linearchange,bulkdensityandporosityofthesamp

4、lesfiredatl00。C.Thevalueofqhasgreatimpactoftheperformanceofthesamplesfiredat1600"C.Whenq=0.24,thesizedistributionisreasonable,andtheperformanceisgood.(2)Thesinteringaidspropertyofboraxisbetterthansilicon,butwhentheyareusedtogether,theperformancewillbebest.Theoverallperformanceofcomp

5、ressivestrength,linearchange,bulkdensityandporosityisbetterwhentheadditionofboraxandsiliconis1.5%andO.8%respectively.(3)Sinteringtemperaturehasgreatinfluenceontheperformanceofthedryrammingmaterial.AlargenumberofM·Aspinelformedafterthesamplesfiredat1200"(2whichresultedill,inturn,alar

6、gevolumeexpansion,loosethestructureofthesampleandpoortheperformance.Thevolumeofliquidphaseinthesamplesincreasedwhichpromotesinteringandoffsetthevolumeexpansionofthereactionofspinelformationeffectivelyasthesinteringtemperatureincreasing.Themagnesiaoftherawmaterialshasallbeeninthereac

7、tionofM-Aspinelafterfiredat1600℃.(4)Duetothehi【ghactivityofa—A1203,theA1203andMgObegintoreactaround903。C.AlargenumberofaluminapowdershadreactedwithmagnesiapowdersformingM-Aspinelduringthesinteringofdryrammingmaterialsat100。C.Theactivationenergyoftheequationofspinelformationreactioni

8、s69.4KJ/m01.andthep

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