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时间:2018-07-09
《本科毕业设计论文--详细设计基于ssh架构的物流管理系统中分站管理模块与配送中心管理模块的设计.doc》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、ZrO2/SiC-MoSi2纳米复合陶瓷制备中纳米颗粒的均匀分散研究学生姓名:班级:指导老师:×××摘要:在纳米复合陶瓷中,纳米颗粒必须均匀分散在亚微米基体中,才有可能在烧结过程中均匀长大,避免因过分长大而失去其特有的增韧作用。而纳米颗粒的团聚是造成纳米颗粒过分长大的主要原因。因此,怎样更好的使纳米颗粒均匀分散是制备优良纳米复合陶瓷的关键。本文采用多相悬浮混合法,对ZrO2/SiC-MoSi2复合材料制备过程中纳米SiC和ZrO2颗粒均匀分布在基质MoSi2中的分散工艺进行了研究。以水和无水乙醇为分散介质,以PEG、PAA-NH4和PMAA-NH4作为分散剂分别对纳
2、米SiC和ZrO2进行分散实验。同时研究了SiC纳米颗粒的表面预处理工艺对其分散性的影响。Zeta电位测试和沉降实验结果表明,采用550℃、2h的煅烧工艺处理纳米SiC可有效改善其分散性。使用水作为分散介质的分散效果均比乙醇好。ZrO2在分散剂为PAA-NH4,SiC在分散剂为PMAA-NH4时的分散效果最好。各种分散剂的加入量为0.2wt%时的分散效果最好。SEM结果表明通过以上最佳分散工艺得到的ZrO2/SiC-MoSi2复合粉体的均匀性较好。关键词:分散纳米SiC颗粒纳米ZrO2颗粒MoSi2指导老师签名:南昌航空大学详细设计报告版本:0.1.1Studies
3、ontheuniformlydispersingofnanoparticlesinZrO2/SiC-MoSi2CeramicNanocompositeStudentname:Class:Supervisor:×××Abstract:Whenpreparingceramicnanocomposites,themostimportanceisthatnanoparticlesareuniformlyinsub-micronmatrix.Otherwisethenanoparticleswillgrowsexcessivelyinthecourseofsintering,
4、whichinducethetougheningfunctionlost.Themainreasonofnanoparticlesgrowingexcessivelyisreunitingofnanoparticles.Therefore,thekeytoprepareexcellentceramicnanocompositesisthatnanopartilesaredisperseduniformlyinmatrix.Inthisarticle,thedispersingofZrO2andSiCnanometerparticlesinthepreparation
5、processofZrO2/SiC-MoSi2compositeswereinvestigatedwithmultiphasesuspensionsmixed.SiCandZrO2nanoparticlesweredispersedwithwaterandthealcoholasthedispersionmedium,PEG,PAA-NH4andPMAA-NH4asthedispersingagent.SimultaneouslytheeffectofthesurfacepretreatmentonthedispersiveinfluenceofSiCnanopar
6、ticleswerestudied.TheZetaelectricpotentialtestandthesubsidenceexperimentindicatedthatthedispersibilityofSiCnanoparticlescanbeeffectivelyimprovedaftercalcinatedat550℃fortwohoursinair.Thedispersingeffectofnanoparticlesusingwaterwerebetterthatusingalcohol.ThedispersionofZrO2isPAA-NH4,theb
7、esteffectofdispersingofsicisatthedispersionmediumofPMAA-NH4.Thebesteffectofdispersionswasinthecontentof0.2wt%.SEMindicatedthatuniformlydispersedZrO2/SiC-MoSi2nanocompositepowdercouldbeobtainedbythebestdispersiblecraf.Keyword:dispersionSiCnanoparticlesZrO2nanoparticlesMoSi2Signatureof
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