無限微熱源法合成β-SiC微粉的中試試驗研究.pdf

1、西安科技大學碩士學位論文無限微熱源法合成βSiC微粉的中試試驗研究姓名：陸樹河申請學位級別：碩士專業(yè)：礦物加工工程指導教師：王曉剛20090507Subject：ExperimentalResearchonaPilotScaleSynthesizedpSiCMicropowderUsingInfiniteminiheatSourcesFurnaceSpecialty：MineralProcessingEngineeringName：Ln

2、ShuheInstructor：WangXiaogangABSTRACT(signature)魚叢堅^壘(Signature)flSiChasbeenextensivelyappliedinaerospace，machinerymetallurgyelectron，militaryindusay嗣Ⅸle屺becatmofitsexceller吐131刪eSinhighkⅡd堪鸚，啷圮sis咖均莓向婦妯婦丘咀m曲mechanicalstr

3、ength，highthermalconductivitysmalllinearexpansioncoefficient，andwidebandgapAtpresent，althoughhighpurityultrafineflSiCpowderscouldbepreparedbyvariousmethods，buttherearemanydisadvantages，suchaShighcost，lowyieldanddifficult

4、toindustrializationTheauthorparticipatesinpilotscaleresearchwhichourteaminventedsynthesistechnologyof／1SiCpowderbyinfinite—mini—heatsourcefurnaceOnetimeChargingweightincreasedto2500kg，andflSiCpowdercanbestablyproduced11l

5、eyieldofflSiCpowderreached70percentandunitConsumptionreducedto23Kwb_／kgThroughcalculation，simulationandnumericalfittingthechangelawofforcedfillingrate，resistanceandpowerthemaintechnologyparametersdeterminedareasfollows：m

6、ixingtimeis20minholdingpoweris100Kwsynthesistimeis130hoursandpowersupplysystemisdividedintofourstagesTheresultsshowthatmaincrystalphaseisflSiCinfirstgradeproductsandsecondgradeproducts，therealegraphiteimpurityinthethirdg

7、radeproductsbyXRDphaseanalysisTheappearanceof8一SiCpowderwhichWasobservedbySEMWasamorphousorsubidiomorphiccrystalandhadagglomerationtosomeextentCharacterizationmsultoflaserparticlesizeanalyzersuggestedthataverageD95ofpart

8、iclesizeWasabout62am，andaverageDs0ofparticlesizeWasabout25amPurityofp—SiCpowderproductbyprimarysynthesisreachedover98percentThispaperdiscussesconductivemechanismofcompositepowderswhichconsistofdifferentrawmaterials11lere