简介：Aseriesoftheelectrochemicalandlong-termcorrosiontestswascarriedoutina3.5wt%Na2SO4solutiononthermal-sprayedWC-17CoandWC-10Co-4Crcermetcoatingsinordertoexaminetheeffectofcompositionofbindermaterialsonthecorrosionbehavior.TheresultsrevealthattheoverallcorrosionresistanceoftheWC-17CocoatingisinferiortothatoftheWC–Co–CrcoatingsduetothecorrosionofbindermaterialswhichinduceWCparticlestofalloff.CoOandWO3oxidefilmsformonthesurfaceofWC-17CocoatinginNa2SO4solutionelectrochemicalcorrosionprocess,whichwillprotectthecoatingintheprocessofcorrosion.Cr2O3oxidefilmformedontheWC-10Co-4Crcoatingsurfacehasastronghinderedroletocorrosion.ThecorrosionmechanismofWC-17CocoatinginNa2SO4solutionisentirecorrosionofComatrix,whileitisfilm-holecorrosionmechanismforWC-10Co-4Crcoating.

简介：以异丙醇铝为前驱体，HNO3为胶溶剂，采用溶胶-凝胶法制备Al2O3膜。考察HNO3浓度对溶胶及薄膜的影响，通过TG-DTG，XRD，AFM，BET等表征手段对溶胶的稳定性及黏度，薄膜的热稳定性，物相组成，表面形貌，微孔结构及分布等进行综合分析。结果表明：随HNO3浓度增大，溶胶黏度增大，HNO3浓度为5mol/L时溶胶发生团聚；薄膜的热稳定性较好，高于500℃加热薄膜几乎没有质量损失；随烧结温度升高，薄膜中的γ-AlOOH逐渐向γ-Al2O3转变，薄膜因此变得更加稳定；薄膜表面较为平整，微孔分布均匀，平均孔直径为4.22nm。

简介：<正>1IntroductionTheundergroundbrineresourcesdistributingwidelyinSichuanBasin,Chinahavedrawnworldwideattentionduetotheirunusualelementabundanceandexcellentquality.

简介：APt-MoO3/Ccatalyst,aimedtoeliminatetheharmfuleffectofsulfurdioxide（SCb）ontheperformanceofPtnanoparticles（NPs）forcatalysisofoxygenreductionreaction（ORR）inprotonexchangemembranefuelcells（PEMFC）,isdevelopedandcharacterizedbyTEM,XRDandXPS.TheresultsrevealthatPt-MoO3/Ccatalystexhibitsnotonlyahighercatalyticactivity,butalsoabetterSO2poisoningresistanceandabetterrecoveryperformancethanthecommercialPt/Ccatalystdoes.

简介：采用碱熔处理样品，酸化后，移取部分溶液稀释后引入ICP测定ZrO2、TiO2、Fe2O3含量，剩余溶液用强碱分离钛、铁、锰等干扰元素后，EDTA—CuSO4法返滴定Al2O3，终点明显，检测重现性好；

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简介：通过电化学分析与测试，研究B4C体积分数分别为20%、30%、40%的B4C/Al基复合材料及其基体合金（6061铝合金）在不同浓度及不同温度的硫酸溶液中的腐蚀行为。由动态极化曲线和阻抗谱得到相应的电化学参数，并利用阻抗分析软件对该复合材料和基体合金腐蚀过程的等效电路进行模拟，分析腐蚀机理，通过Arrhenius方程计算腐蚀过程中B4C/Al基复合材料与6061铝合金的反应活化能，并分析两者的焓变与熵变，对腐蚀前后2种材料界面的微观结构进行观察。结果表明：B4C/Al基复合材料在硫酸溶液中的腐蚀速率随B4C颗粒含量增加而增大，基体铝合金在硫酸中的耐腐蚀性能高于B4C/Al基复合材料。B4C/Al基复合材料和基体铝合金在硫酸中的腐蚀速率都随硫酸溶液浓度增加而增大；当溶液温度升高时，二者的腐蚀速率都快速增加。B4C/Al基复合材料和Al基体合金在硫酸溶液中的腐蚀都表现为明显的点蚀。铝基体材料在硫酸溶液中的反应活化能大于B4C/Al基复合材料，计算所得活化焓与活化熵的值均表明复合材料的腐蚀反应比基体合金更容易进行，因而遭受腐蚀更严重。

简介：在80%Al-20%CuO（质量分数）体系中,通过原位反应法制备Al2O3p-Al复合材料。采用不同方法研究CuO颗粒粒度对复合材料合成温度和显微组织的影响。结果表明,CuO颗粒粒度对Al-CuO体系的完全反应温度有显著影响：含有粒度小于6μmCuO颗粒样品的完全反应温度比含有粒度小于100μmCuO颗粒样品的完全反应温度低200°C。当反应温度低于某一临界值时,原位Al2O3颗粒和Al基体之间不能完全结合;当温度高于某一临界值时,原位Al2O3颗粒的形貌从棒状转变成近球形。这两个临界温度受CuO颗粒粒度的影响：含有粒度小于6μmCuO颗粒样品的临界温度比含有小于100μmCuO颗粒样品的临界温度低100℃。

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简介：InthispaperweusedMOF-5andCu3(BTC)2toseparateCO2/CH4andCH4/N2mixturesunderdynamicconditions.Bothmaterialsweresynthesizedandpelletized,thusallowingforameaningfulcharacterizationinviewofprocessscale-up.ThematerialswerecharacterizedbyX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM).Byperformingbreakthroughexperiments,wefoundthatCu3(BTC)2separatedCO2/CH4slightlybetterthanMOF-5.BecausethecrystalstructureofCu3(BTC)2includesunsaturatedaccessiblemetalsitesformedviadehydration,itpredominantlyinteractedwithCO2moleculesandmoreeasilycapturedthem.Conversely,MOF-5withasuitableporesizeseparatedCH4/N2moreefficientlyinourbreakthroughtest.

简介：采用纳米粒子二元复配填充改性及冷压烧结工艺,制备了Al_2O_3/CaCO_3/PTFE三元复合材料,对其力学性能进行了探讨。实验结果表明,纳米粒子的填充显著提高了PTFE的摩擦磨损性能、硬度、抗蠕变性能及拉伸强度,降低了断裂伸长率。当Al2O3质量分数为20%、CaCO_3质量分数为10%时,PTFE复合材料综合力学性能优异。

简介：Theeffectofpromotercobaltandthesequencesofaddingcobaltandmolybdenumprecursorsontheperformanceofsulfur-resistantmethanationwereinvestigated.AllthesesampleswerepreparedbyimpregnationmethodandcharacterizedbyN2-adsorption,X-raydiffraction(XRD),temperature-programmedreduction(TPR)andlaserRamanspectroscopy(LRS).TheconversionsofCOforMo-Co/Al,Co-Mo/AlandCoMo/Alcatalystswere59.7%,54.3%and53.9%,respectively.Amongthesecatalysts,theMo-Co/AlcatalystpreparedstepwiselybyimpregnatingMoprecursorfirstlyshowedthebestcatalyticperformance.Meanwhile,theconversionsofCOwere48.9%forMo/Alcatalystand10.5%forCo/Alcatalyst.TheadditionofcobaltspeciescouldimprovethecatalyticactivityofMo/Alcatalyst.TheN2-adsorptionresultsshowedthatCo-Mo/Alcatalysthadthesmallestspecificsurfaceareaamongthesecatalysts.CoMoO4speciesinCoMo/AlcatalystweredetectedwithXRD,TPRandLRS.Moreover,crystalMoS2whichwasreportedtobelessactivethanamorphousMoS2wasfoundinbothCo-Mo/AlandCoMo/Alcatalysts.Mo-Co/Alcatalystshowedthebestcatalyticperformanceasithadanappropriatesurfacestructure,i.e.,nocrystalMoS2andverylittleCoMoO4species.

简介：通过试验对比等方法,分析了添加MgO和稀土氧化物Y2O3对多晶Al2O3透明陶瓷的微观结构（气孔率、晶粒大小和分布）、力学性能以及全透光率的影响。结果表明:当MgO质量分数为0.05%、Y2O3质量分数为0.02%时,样品的力学性能和光学性能最佳。研究可为制备透明陶瓷装甲材料提供理论支撑。

简介：AseriesofAlx-(Alq3)1-xgranularfilmsispreparedonSiwaferwithnativeoxidelayerusingco-evaporationtechnique.Largelateralphotovoltaiceffect(LPE)isobserved,withanoptimalLPVsensitivityof75mV/mminx=0.35sample.ThedependenceofLPEontemperatureandAlcompositionisinvestigated,andthepossiblemechanismisdiscussed.

简介：Inthecurrentpaper,dry(CO2)-reformingofglycerol,anewreformingroute,wascarriedoutoveralumina(Al2O3)-supported,non-promotedandlanthanum-promotednickel(Ni)catalysts.Bothsetsofcatalystsweresynthesizedviaawetco-impregnationprocedure.Physicochemicalcharacterizationofthecatalystsshowedthatthepromotedcatalystpossessedsmallermetalcrystallitesize,hencehighermetaldispersioncomparedtothevirginNi/Al2O3catalyst.ThiswasalsocorroboratedbythesurfaceimagescapturedbytheFESEManalysis.Fromtemperature-programmedcalcinationanalysis,thederivativeweightprofilesrevealedtwopeaks,whichrepresentawatereliminationpeakatatemperaturerangeof373to473Kfollowedbynickelnitratedecompositionfrom473to573K.Inaddition,BETsurfaceareameasurementsgave85.0m2g-1forthenon-promotedNicatalyst,whilstthepromotedcatalystsshowedanaverageof1%to6%improvementdependingontheLaloadings.Significantly,reactionstudiesat873KshowedthatglyceroldryreformingsuccessfullyproducedH2.The2%La-Ni/Al2O3catalyst,whichpossessedthelargestBETsurfacearea,gaveanoptimumH2generation(9.70%)ataglycerolconversionof24.5%.

简介：采用浓HNO3/浓H2SO4混合酸在60℃超声环境下对T300碳纤维进行表面氧化处理，并以其为增强体制备碳纤维/环氧树脂复合材料。利用X射线光电子能谱仪、拉曼光谱仪、扫描电镜、原子力显微镜对表面氧化前后的碳纤维形态与表面化学性质进行表征，研究氧化时间对纤维的表面形貌与表面性质以及碳纤维/环氧树脂基复合材料力学性能的影响。结果表明，氧化初期，碳纤维表面生成S—、N—含氧基团，以及—OH和—C=O；后期形成—COOH，氧化时间为15min时，—COOH的浓度达到最大值。碳纤维/环氧树脂复合材料的强度随混合酸氧化时间延长而不断增强，氧化15min时强度达到峰值，相比于未氧化处理的样品，复合材料层剪切强度从16.3MPa提高到38.8MPa，抗弯强度从148.3MPa提高到379.7MPa。

简介：Aseriesofnovelbluelong-lastingphosphorescencephosphorsSr6Al18Si2O37:Eu2+,RE3+(RE3+=Ho3+,Gd3+,Dy3+andPr3+)werepreparedbytheconventionalhigh-temperaturesolid-statereactioninareductiveatmosphere.TheirpropertiesweresystematicallyinvestigatedutilizingX-raydiffraction(XRD),photoluminescence,phosphorescenceandthermoluminescence(TL)spectra.ThephosphorsemittedbluelightthatwasrelatedtotheemissionofEu2+dueto5d-4ftransition.Brightbluelong-lastingphosphorescence(LLP)couldbeobservedaftertheexcitationsourcewasswitchedoff.Fortheoptimizedsample,thebluelong-lastingphosphorescencecouldlastfornearly4hinthelightperceptionofthedark-adaptedhumaneye(0.32mcd/m2).TheeffectsofRE3+ionsonphosphorescencepropertiesofthephosphorswerestudied,andtheresultsshowedthattheco-dopingofRE3+ionsgreatlyenhancedtheintensityofthepeakaround315Kwhichwasrelatedtothelonglastingphosphorescenceofthephosphorsatroomtemperatureandconsequentlyimprovedtheperformanceofthebluephosphorescencesuchasintensityandpersistenttime.

简介：Thegreenlong-after-glowluminescencefromTb3+-dopedSr2SiO4phosphors,whicharesynthesizedbythehightemperaturesolidstatereactioninareductiveatmosphere,isobservedinthispaper.Theresultsshowthatunderultravioletexcitation,theobtainedphosphorsproduceanintensegreen-lighting-emissionfromtheTb3+,andthegreen-lightinglongafter-glowluminescencerelatedtoTb3+canlasthalfanhouraftertheirradiationsourcehasbeenremoved.Moreover,theeffectsofco-dopingLi+,Dy3+,Er3+,Gd3+,andYb3+withTb3+onthedecaypropertiesandthermoluminescencepropertiesareinvestigatedtoconfirmthelong-after-glowmechanism.

简介：Throughimprovingtheagingprocessduringsynthesisofthesupport,γ-Al2O3withlargeporevolumeandhighsurfaceareawassynthesizedbyafacilesecondaryreformingmethod.Thesynthesisparameters,suchasthereactiontemperature,thefirstagingtemperatureandthesecondagingtemperature,wereinvestigated.Thetexturalpropertiesofγ-Al2O3werecharacterizedbymeansofN2adsorption-desorptionisotherms,X-raypowderdiffractometry(XRD),scanningelectronmicroscopy(SEM),Fouriertransforminfrared(FTIR)spectroscopyandthermogravimetry(TG).TheexperimentalresultsindicatedthatAACHandamorphousAlOOHweretheprecursorsofalumina,whichwereformedviaprecipitationfromsolutionsafterreactionofaluminumsulphatewithammoniumhydrogencarbonate.Theprecursornanocrystallitesgrewandre-assembledduringthesecondaryreformingprocess,whichresultedinanincreasedporesizeandporevolumeandadecreasedbulkdensity.Theas-synthesizedγ-Al2O3materialsfeaturedmeso/macroporosity,largeporevolume(2.175cm3/g),highsurfacearea(237.8m2/g),andlowbulkdensity(0.284g/mL).

简介：Nanostructuredγ-Al2O3withhighsurfaceareaandmesoporousstructurewassynthesizedbysol-gelmethodandemployedascatalystsupportfornickelcatalystsinmethanereformingwithcarbondioxide.ThepreparedsampleswerecharacterizedbyXRD,N2adsorption-desorption,TPR,TPO,TPH,NH3-TPDandSEMtechniques.TheBETanalysisshowedahighsurfaceareaof204m2g-1andanarrowpore-sizedistributioncenteredatadiameterof5.5nmforcatalystsupport.TheBETresultsrevealedthatadditionoflanthanumoxidetoaluminumoxidedecreasedthespecificsurfacearea.Inaddition,TPRresultsshowedthatadditionoflanthanumoxideincreasedthereducibilityofnickelcatalyst.Thecatalyticevaluationresultsshowedanincreaseinmethaneconversionwithincreasinglanthanumoxideto3mol%andfurtherincreaseinlanthanumcontentdecreasedthecatalyticactivity.TPOanalysisrevealedthatthecokedepositiondecreasedwithincreasinglanthanumoxideto3mol%.SEMandTPHanalysesconfirmedtheformationofwhiskertypecarbonoverthespentcatalysts.AdditionofsteamandO2todryreformingfeedincreasedthemethaneconversionandledtocarbonfreeoperationincombinedprocesses.