我的外文多孔陶瓷阅读文献心得.doc

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1、第一篇Densiflcationandanisotropicgraingrowthindiphasicgel—derived,titania-dopedmullitewerestudied・Titanicenhancedinitialandintermediatestagedensiflcadonindiphasicmullitesetsbyreducln,th@gjasivitodiy.RodHkeaniM)tropicmullitesr^insstarted(ogrowintitaniadopeddiphasicmullitegdsonce*denw,equiaxed

2、microstructurewasachieved・TheonsettmiperatureforanisotropicBrainKiowthdecreasedwithIncrea^lnstitaniaconcentrationbecauxethexinterinetcvnperiitureforflnul«tagedensincadondecresixfd.Theloweston^ettmiperntureforanivotrophgrainujowthwas*-1500Cin5wt%tituniadopedmullite.The跡pz(ratioandareafract

3、ionofanisotropicmullheIHAiiiKincreasedwithhiolierdtaniaconcentrati

4、h[001]andthickness[110]directions,respectheij.Theactivationenergiesforgraingrowthwere690kJmolforthelengthand790kJmolforthethicknessdirections.I.Introductionmore.inordertoimprovethemechanicalpropertiesofmullite,particularlytoughnessanisotropicgraingrowthhasbeencx・ploredtodevelopathree-dime

5、nsionallyinterpenetratingacic-ulargrainmicrostructure.18Muiiitchasastrongtendencytogrowasrodshtiiegrains

6、srowwitiioutconstraint,suchasindirectionalsolidified)中丿•■叵andduringvapor-solidsynthesisofwhiskers.20Inbothcases,heuhiskersgrewinthec-axisandwereboundedby{110}19or{1110surfaces・Fromthes

7、ert口山乩itisbtlicvcdthaitheprismaticplanes(110)or(111)havealowersurfaceenergythantheotherplanes,andthus,grainsgrowinthe(001)direc・tionforIhennodynaniicreasons・Thisgrowthhabitisstronglyrelatedtothecrystalstnictiireofmullite.MulliteiscomposedofoctahedralA1O6chainsalignedinthec-diiectionandcro

8、sslinkedbycomer^sharedA1O4andSiO4tetraheclra.21zumberofdopantssuchasB263/Fe2O3>iindTiO2havebeenreportedtopromoteanisotropicgraingrowthinmullite.22,23Schneider2*attributedanisotropicmicrostructuredevelopmentintransitionmetal(titanium,iron)oxide-dopedmullitetoalow