大型感应炉用干式捣打料性能的分析

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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