喷雾热解法合成镁铝尖晶石纳米粉末的制备与表征

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1、西安建筑科技大学硕士学位论文嚷雾热解法合成镁镊尖晶夏缎米粉末兹割餐与表征专业：材料学磺究生：张小会导师：蒋明学教授摘要本文用喷雾热解法合成了Mg加204纳米粉末，设计并制作了乙烘和氧气助燃的喷雾热解装置，用此设备合成了一次粒径为10—60纳米、团聚颗粒直径为1802晦米的球形失晶石粉寒。爰X-ray、SEM帮激光越发分援铰对尖翕夏羧末进行’歹表，珏。通过研究得到如下结论：1．水，乙醇，硝酸镁和硝酸铝适宜作为合成尖晶石的起始物，因为通过试验发现氯化甥系统对设镰的腐蚀陡较大；硫酸盐系统愆到的羚末较耀：害毒乙醇豹系统褥筏的耱末毙没有乙醇熬系统得羁纳粉末

2、蓬松，易收祭。2．影响粉末一次粒径和颗粒粒径的因索很多。随酒精和水的比值的减小，粒径和颗粒粒径都增加；糠径随溶液浓度的减小，先减小后增加；一次粒径随篷力的变化，变化缀，j、，瞧隧压力鞫漉羹兹增翔，鞠聚体增多、鬻聚粒径增大。3．从产率上来看，压力和流量对产率的影响最大。随压力和流髓的增加，产窀明显增大。4．嚣蔻怒潮瓣耪束冗乎黎为球形，毽颓蔽越径分露蒗圈}￡较宽。这也是唆雾热薅粉末的典型特点。麓继字：喷舅热解纳米尖晶石合成与表征西安建筑科技大学硕士学位论文TheSynthesisandCharacterizationoftheNano-SpinelP

3、owdersbySpray—PyrolysisSpecility：MaterialSciencePost-graduate：ZhangXiaohuiInstructor：Prof．JiangMiugxueAbstractMgAl204nano—powderswerepreparedbythespray-pyrolysismethod．Anethane—oxygen—assistedspray-pyrolysisequipmentwasdesignedandconstructed，bywhichthesphericalpowdersofcrysta

4、llinewith10-60nmindiameterandagglomerationparticlewith180nmindiameterwereprepared．MgAl204nano-powderswerecharacterizedbyX·raydiffraction，SEM，lasergranularityanalysisequipment．Thefollowingconclusionshavebeenapproachedfromthisstudy：1Water,alcohol，magnesiumnitrateandaluminumnitr

5、atearemorefeasiblestartmaterialsforpreparingthespinel．Otherwisewefoundfromtheexperimentsthatthechloridesystemerodesseriouslytheequipment，andthatthepowdersfromthesulfatesystemaretoolargeinsize．Therefore，onlythepowdersfromthesystemcontainingalcohol，comparedwiththepowdersfromthe

6、systemwithoutalcoh01．aIeflemcierandC．anbecollectedmoreeasily．2SeverMfactorsaffectthecrystallinesizeandtheparticlesizeofthepowders．Astheratioofalcoholtowaterdescends，bothofthemrise．Asthesolutionconcentrationofnitratesdescends，thecrystallinesizefirstlydescendsandthenrises．Theno

7、zzlepressurebringsforthlittleaffluenceonthecrystallinesizeofthepowder,buttheelevatedpressurecanenlargethequantityandthesizeoftheagglomeration．3Thenozzlepressureandthesolutionfluxsetupamagnificentinfluenceonthepowderyield，andtheyieldevidentlyriseasthepressuredose．4Themostparto

8、fpowderisspheficalwithabroadparticlesizedistribution．Thisisthetypica