简介:Aswitchablemultiwavelengthlaserwithacontinuouslytunablespacingisproposedandillustratedbasedoncascadedinteractionsofthesecondharmonicanddifference-frequencygenerationsinanaperiodicallypoledMgO-dopedlithiumniobate(MgO:APPLN)waveguide.Thewavelengthsandwavelengthspacingsofthefouroutputsarecontinuouslyvariedandcontrolledbychangingthetwoinputpumpwavelengthsandspacingswithina3-nmflattopbandwidthofMgO:APPLN.Inaddition,theswitchablestatesofthefouroutputscanbeselectedbyinputtingproperpowersofthetwopumps.ThenumberofoutputwavelengthscanalsobeincreasedbychoosingtheproperAPPLNstructure,thetotallengthofMgO:APPLN,andhigherpowersofinputpumplights.
简介:InthispaperwepresenttheresultsofstudiesonmakingMgOzirconiasinteredparts(intendedtobeusedasmeteringnozzlesincontinuouscastingofsteel)frommonocliniczirconiaandMgOpowdersviaagranulationprocess.Thepartswerepressedandsinteredunderdifferentconditions,andanalysedforphysicalproperties,microstructureandphasecomposition.WefoundastronginfluenceoftheMgOconcentrationandthesinteringcycle,especiallythecoolingrateonthethermalshockresistance.Thepaperconcludeswithrecommendationsfortheproductionofzirconiameteringnozzlesinaneconomicway.
简介:Al2O3-MgOcastableshavebeenwidelyusedforworkingliningsofsteelladleduetotheirsuperiorhotstrengthandcorrosionresistance.Inthiswork,effectsofmicrosilica,ultrafinealuminaandMgOfinesadditionsontherheologicalbehaviorofthecastableswereinvestigatedbymeansofIBBrheometerV1.0tomeasuretorque(shearstress)undervaryingshearrates.Theresultsshowthatrheologicalpropertiesofcastablesatvaryingshearratesaresignificantlyimprovedwithincreaseofmicrosilicaadditions(from1mass%to5mass%)andcorrespondingdecreaseinwateraddition;thereisonlylittlechangeinrheologicalbehaviorwithvariationofultrafinealuminaandMgOfinesadditions.Optimumultrafinealuminaandmicrosilicaadditionsarerecommendedforcastableswithgoodrheologicalbehavior.
简介:TheinfluencesoffourkindsofadditivesaddedintothematrixofMgO-Al2O3unbunedproductswereinvestigated,TheresultsshowthatsampleswithproperMgO/Al2O3rationandproperadditionofCr2O3(2%-4%)havegoodthermalshockresistanceandslagcorrosionresistanceaswell,XRDandSEMdeterminationresultsindicatethatakindofcompoundspinel(Mg,Al,Cr)O4wasformedandthemicrostuctureofthesamplesaredenser.
简介:MgO薄电影被激光脱离在各种各样的底层温度(T潜水艇)下面在Si(100)底层上扔,期望提供为Si底层上的功能的perovskite氧化物电影的粗糙的生长的候选人缓冲区层。比较喜欢的取向,crystallinity和这些电影的表面形态学上的T潜水艇的效果被调查。MgO电影在单相在473973K被获得。与增加T潜水艇,这些电影的比较喜欢的取向变化了从(200)到(111)。crystallinity和表面形态学也是不同的,依靠T潜水艇。在Tsub=673K,MgO电影变得一致、光滑,展出高crystallinity和一块稠密的质地。
简介:这研究表明一出新奇一步舞在与搏动的DC电压包含苯胺单体和苯乙烯丙烯酸的乳剂(SAE)的酸磷酸盐电解质在镁合金上制作厚bilayer涂层的电气化学的方法。形态学,XRD和bilayer涂层由内部氧化物层和外部polyaniline(PANI)组成的FTIR结果表演/SAE合成的层。bilayered结构从联合苯胺,SAE的electrophoretic免职(EPD)和镁合金底层的血浆电解质氧化(PEO)的electropolymerization(EPM)的一个混合过程完成了结果,这被相信。电气化学的腐蚀测试显示bilayer涂层能在3.5wt.%NaCl答案提供优异腐蚀保护给镁合金底层。
简介:Althoughhigh-performancebasicrefractorymaterialsplayanessentialroleinstate-of-the-artsteel-making,magnesiacastableshavenotbeenwidelyuseduntilnow.Amajorchallengeisthatbruciteformation(Mg(OH)2)duringMgOhydrationcausesvolumeexpansionandsubsequentcracking—aphenomenoncommonlycalled"slaking".Toovercomeproblemsrelatedtoslaking,anewspecialtyproduct,SioxX-Mag,hasrecentlybeendevelopedforcement-freeMgOcastablesbasedonMgO-SiO2-H2Obond.Specimensfromindustrial-scale-sizedblocksafterdry-outwerecharacterisedbySEMandXRDtechniques.UsingSioxX-Magincombinationwithmicrosilica,crackingcausedbybruciteformationissuppressed.Theresultsdemonstratethatthedosageofmicrosilicaplaysessentialrolesinthecrackformationinlargesamples.Furthermore,thecompatibilityofSioxX-Magwithdifferenttypesofbasicaggregates,mediumtohigh-gradedead-burnedmagnesiaandolivine,hasalsobeenevaluated.High-performance,self-flowingcement-freeMgOcastableshavebeendeveloped.
简介:Apreliminaryapplicationofthedigitalimagecorrelation(DIC)ispresentedaimingtodetectandanalyzecracknetworkswhichareinducedbystressesarisingduringcuringanddrying(CD)ofMgOcontainingrefractorycastableslabs.SurfaceimagesofcastablesamplesplacedinaspeciallydesignedclimaticchamberwererecordedovertheCDstageswithadigitalcameraandprocessedbytheDICtechniquetomeasurethedisplacementfields.Post-processingDICresultswerecarriedouttoestimatethelength,orientationandopeningofcracksinthenetworks.Themethodologyishighlightedandthefirstexperimentalresultsareshownpointingoutitsfuturepotentialtobetterunderstandtheeffectofthephysicalaspects(particlesize,chemicalanalysis,temperature,etc.)andthestructuralones(slabshapeandsize)onprocessingandperformanceofadvancedrefractorycastables.
简介:TheeffectofTi(C,N)onpropertiesoflow-carbonMgO-Cbrickswasinvestigated.Thephasecompositionandthemicrostructureofthematrixoflow-carbonMgO-CbrickcontainingTi(C,N)werestudiedbyXRDandSEManalysistogetherwithEDS.TheresultsshowedthatTi(C,N)distributedinthematrixoflow-carbonMgO-Cbrickuniformlyafterbeingtreatedat1600℃for3hincokepowderbed,andTi(C,N)andMgOformedasolidsolution.Afterthetreatmentat1600℃for3hincokepowderbed,thebulkdensityandcoldcrushingstrengthoflow-carbonMgO-CbrickwithTi(C,N)decreased,andtheapparentporosityandlinearchangerateofspecimensincreased.Theoxidationresistanceoflow-carbonMgO-CbrickwithTi(C,N)wassuperiortothatoflow-carbonMgO-Cbrickwithnoadditives,butinferiortothatoflow-carbonMgO-CbrickwithAlpowder.TheslagresistanceofthespecimenwithTi(C,N)wasexcellentaswell.
简介:Thestabilizationofγ-aluminiumoxyni-tridespinel(γ-AlON)hasbeeninvestigatedbyadditionofMgO,MgAl2O4,etc.,inreactionprocess.Theresultsindicatedthattherearewidersolidsolutionareasnear,Al2O3-richsideinAlN-Al2O3-MgOternarysystems,ThecontentofstabilizedAlONphaseinsamplesisrelatedtoheatingtemperatures,additives,etc.ThelatticeparametersoftheirAlONphasescouldbewelldescribedbytheequation:a0=0.7900+0.0375[MgO]+0.015[AlN](nm)