超細(xì)莫來石粉體的制備研究.pdf

1、鄭州大學(xué)碩士學(xué)位論文超細(xì)莫來石粉體的制備研究姓名：申小清申請學(xué)位級別：碩士專業(yè)：無機(jī)化學(xué)指導(dǎo)教師：張鴻云2002.5.22蔓蘭奎塑一一——————————————————————一PreparationofUltrafineMullitePowdersAbstractU1t嘶nemullitepowderswerepreparedbythecalcinationofthemullltepr。叫30r口owdersobtainedbyac

2、o，precipitationmethodandfollowedbynbutanolazeotropicdistillationprocessusingaluminiumnitrate，waterglassandammoniumcarbonateasrawmatenalslheefleetsofprecipitatingprocessconditionsontheprecipitationformofproductsandtheDmpe

3、rtiesofmullitepowdersobtainedwerestudiedandtheoptimumprocessconditionsfo’恤emanufactureofmulliteprecursorpowdersweredeterminedThechangesofthethermochemicalbehaviOUrs，phasestructure，particlesize，morphologyBETspecificsurfac

4、eareaandapparentdensitvofmulliteprecursorpowdersintheprocessofcalcinationwereinvestigated，andTGDTAXTD，TEM，艱spectra，nitrogen，adsorptionandsomeotherexperimentmethodshayebeenemployedtocharacterizetheproductsInaddition，thesi

5、nteringbehaviorofthemulliteprecursorpowderswasalsostudiedaftercoldisostaticpressingofthepowdersat180MPa。Theresearchresultsshow：f1)Ultrafinemullitepowders，withparticlesizeintherange60—90nmcanbeobtainedbycalcinatingat1300。

6、Cfor1hthemulliteprecursorpowderwhichwasintheshapeofshortfiberwith510nminwidthand50100nminlengthandCaBbepreparedbyn—butanolazeotropicdistillationofthewetaluminumsilicategels(orprecipitates)synthesizedundertheconditionsofr

7、eactiontemperature3840℃，AI州03)3concentration03m01／L，fNH4hC03concentration15molFLNH4N03additionO36mol／LandPEG(200，1540，6000)additiono35％(2)Thesequenceofphasetransformationofthemulliteprecursorpowdersduringcalcinatingwasfo

8、undtobeyAIO(OH)vagueSiOzj竺L◆amorphousA1203amorphousSi02竺：，AI—SiSpinelamorphousSi02坐!：妒ullite(3)Calciningthemulliteprecursorpowdersbelow600℃candecreasetheapparentdensity，buthasonlyslightinfluenceonthespecificsurfaceareawh

9、ilecalciningabove600。CwillreducethespecificsurfaceareaandincreasetheapparentdensityThespecificsurfaceareaandapparentdensityofmullitepowderswere30mZ／gand159／mlrespectivelyatthetemperatureof13004C(4)Mulliteprecursorpowders