高壓處理對金屬氧化物特性的影響.pdf

1、分類號UDC密級學校代碼10盛97學劣搏對筍大亨位論t又題目英文題目研究生姓名高壓處理對金屬氧化物特性的影唯EffeetofHighPressureandTemPeratureTreatmentonthePronertiesofMetalOxide徐萍指導教師姓名田旭職稱教授單位名稱理學院郵編學位碩士430070中請學位級別碩士學科專業(yè)名稱凝聚態(tài)物理一論文提交日期2008年H月論文答辯日期2008年12月學位授予單位武漢理工大學學位授予

2、日期答辯委員會主席晏石林評閱人李建青黎明發(fā)2008年12月武漢理_人學碩十學位論文AbstraetInthisPaPer，effeetofhighPressureandtemPeraturetreatmentontheProPertiesofMetalOxideweremainstudied.AsanexamPletothemierostrUctureandsinteringdensityofzno月12典whiehunderhighp

3、ressuretemperatureTheZnOandA12O。nanoerystalswereProeessedunderhighPressureandtemPeratureonaeubichighPressureaPParatus.Thetreatedtimewas25minutes.ThemierostructureoftheobtainedZnOA12qwereacterizedbyscanningeleetronmierose

4、oPy(SEM)andX一raydiffraetion(XRD)，theSinterlngdensltyofthesamplesweremeasuredwithdralnagemethod.WiththeexPerimentalresults，effeetofhighPressureandtemPeraturetreatmentonthemicrostruetureandSlnteringdensityofZnOandA12qnanoc

5、rystalsWereinVestigated.Firstl又thevarietyofmorphology，grainsizes，andstructureofthesamPleswerestudiedunderdifferenttemPeratureandPressure.TheSEMandXRDresultsshow:thePhasetransformationdldn’thappentothesa哪lesofA12O3whlehwe

6、retreatedunderhzghtemPeratureandhighPressure.UnderthehighPressure，asthetemPeratureincrease，thegrainsizesofthesamPlesincrease.Iteanbeseenunifmgrainsizeofalumina.AlloftheZnOsamPlesintheexPerimentPresentahexagonalwurtzitest

7、rueture.ThenanoerystalseventuallytransfmtobulkmaterialswhilethegrainsizesinereasewiththetemPeratureinereasingunderaeertainPressure.ItindieatesthathightemPeratureeanobviouslyPromotethegrowthofthegrain.AndunderthehightemPe

8、rature，thegrainsizeinereaseswithinereasingthePressure.Underthe6GPa、850oCtreatment，thePhasetransfmationofZnOwasnotobserved.Therefe，theresearchonthePhasetransfmationofZnOshouldbedoneunderhigherPressureandtemPeratureeonditi

9、ons.Then，measuringline一shrinkagerate，densityofsinteredsamPles.AndeffeetofhighPressureandtemPeraturetreatmentontheSinteringdensityofZnOA12qnanoerystalswereinvestigated.TheresultsshowthatasthetemPeratureandPressureinerease