简介：反应粉末水泥(RPC)的三种类型的影响行为用测试方法的裂口Hopkinson出版社酒吧(SHPB)被学习。这些RPC分别地与0%，3%，和4%的钢纤维体积部分被准备。压力紧张关系，紧张率敏感阀值价值，动态力量增加因素，弹性的模量和使遭到影响负担的这些RPC标本的失败模式被调查。从测试，50s1的紧张率敏感阀值价值被获得。试验性的结果看了那紧张率什么时候从阀值价值增加了到RPC的最大的压力增加了大约20%的95s1,，RPC的弹性的模量增加了大约30%。当使遭到了影响时，有钢纤维加强的RPC标本的失败模式与RPC矩阵标本的很不同装载。在装载率的类似的影响下面，在钢纤维开发的裂缝增强了RPC标本，虽然RPC矩阵标本被分解为小片。

简介：X-rayfluorescencespectrometry(XRF),X-raypowderdiffractometry(XRD)andscanningelectronmicroscopy(SEM)wereusedtocharacterizethechemicalcomposition,phaseconstituentandmicrostructureofthecoalgasificationslag.Sialonpowdersweresynthesizedbycarbothermalreductionandnitridationusingthecoalgasificationslagasrawmaterials.Theexperimentalresultsshowedthatglassandamorphouscarbonwerethemainphases,quartzandcalciteasminorcrystallinephaseswerealsopresentedinporouscoalgasificationslag.MainconstituentsofcoalgasificationslagwereSiO2,Al2O3,CaOandresidualcarbon.SialonpowderwithCa-α-Sialonasmaincrystallinephasecanbesynthesizedwhencoalgasificationslagpowderswerereducedandnitridedat1500℃for9husingnitrogenflowof500ml/min.ThecoalgasificationslagisavaluableandeconomicstartingmaterialforpreparingSialonpowders.

简介：

简介：银粉末被水花热分解制作，用2%20%AgNO3答案，AgNO3答案的336500mL/h流动，搬运人气体并且在620820°C温度范围的0.280.32MPa流动。炉子集合温度的效果，AgNO3的集中水的答案，AgNO3的流动形态学上的水的答案以及搬运人气体和银的粒子尺寸分发搽粉，被调查。试验性的结果与AgNO3的高集中显示出那水的答案，银的平均谷物尺寸与增加炉子集合温度减少了。但是获得尺寸分发不是同质的，不连续的谷物生长发生了。与AgNO3的低集中水的答案，更高的炉子集合温度一起使nano裂片谷物成为了sintered成长。Nano银粉末大约100nm被水花热分解制作用2wt%AgNO3答案，AgNO3的336mL/h流动水的答案，在720°C炉子的搬运人气体的0.32MPa流动设置了温度。

简介：Thisresearchfocusedonusingthewasterubberpowderasakindofregenerateresourcestoimprovethemechanicalpropertiesofcementmortar.ThetwokindsofhybridmodifiedrubberpowderTRPandATRPwerepreparedbysol-gelmethodandthenusedincementmortar.Thestructuresandpropertiesofthemwerestudied.ItisshownthatthenanoSi-O-SinetworkisgeneratedinTRPandATRPnetworksandthehydrophilicgroupisgraftedonthesurfaceofATRP.Themechanicalpropertiesofrubber-treatedmortar(RTM)weretestedandthemicrostructuresofthemwerealsostudied.Comparedtothemortarswithunmodifiedrubberpowders(RP),NaOHtreatedrubberpowder(SRP)andcouplingagenttreatedrubberpowder(CRP),theRTMwithATRPhasthehighestcompressivestrengthandflexuralstrength.Thestress-straincurvesshownthatthepeakofstressofRTMwithATRPisincreasedandindicatedthehighercompressiondeformationandtoughness.ItisfoundthattheinterfacialadhesionbetweentheATRPandcementmortarisincreaseddistinctlybySEM,whichresultsinenhancedductilityandmechanicalpropertiesofRTMwithATRP.

简介：

简介：为从氯化铜溶液再循环铜的方法被开发。这个过程由铜，纯化和粒子尺寸减小的抽取组成。在第一步，减少的金属碎片被加到废物迷住的酸的氯化铜在聚氯联苯工业生产了获得铜粉。作文分析证明这粉末包含了象Fe，Ni，和水那样的杂质。那么，弄干并且纯化被使用微波和一个离心分离器执行。从而，铜粉有纯净比99%高、球形在形态学的形式。铜粉尺寸被球milling减少。

简介：Coprecipitationsupercriticalfluiddryingtechnologyhasbeenemployedtosynthesizecalcia-stabilizedzirconiaultrafinepowderwithlow-costinorganicsaltsasthestartingmaterials.Thesinteringbehaviorsofthesepowderswerealsoinvestigated.Theresultsshowedthatsupercriticalfluiddryingcouldeffectivelyalleviatethehardagglomerationofgrainsduringthegeldryingprocess,andthemorphologyofthepowderretainedthenetworktextureoftheoriginalgel.Theresultingparticleswerecharacterizedbysmallparticlesize(5～20nm),bettermonodispersityandhighsurfacearea,whichgaverisetohighactivityandsinterability.Consequently,thesepowderscouldreadilybecompactedintothedesiredshapeandtheirdensificationcouldbecarriedoutinshortertimeandatlowertemperatures.Forinstance,nanometer-sizedpowdercalcinedat600℃for2hcouldbecold-pressedintoagreenbodyandsinteredat1100°for0.5htoattainadensebodywithbulkdensityof5.9718g/cm3andspecificporevolumeof0.0008cm3/g.

简介：铝泡沫三明治被rolling-bonding/powder准备在脸表/粉末和粉末密度的契约力量上滚动的冶金的起泡沫技术，和效果被学习。而且，起泡沫的代理人，TiH2，热被对待，Mg的某个数量在一次尝试被增加进粉末理解泡沫的稳定性和一致性怎么被改进。试验性的结果证明有理想的质量的起泡沫的先锋被结合转动的过程获得。当卷减小是67%时，粉末的一致性活动范围到99.87%。在整个脸表/核心层粉末和粉末的变丑特征结合的考虑，卷减小的最佳是60%70%。裂缝和排水被起泡沫的代理人TiH2的热处理和Mg的某个数量的增加在起泡沫期间禁止。TiH2的最佳热处理方法是在450点保存1个小时的那热???眶?嘠伲‵???ㄠ‵吗？

简介：AhypereutecticAl-Sialloypowderwaspreparedbyultrasonicgasatomizationprocess.Themorphologies,microstructureandphaseconstituentofthealloypowderwerestudied.TheresultsshowedthatpowderofthealloywasveryfineanditsrnicrostructurewasmainlyconsistedofSicrystalsplusintermetalliccompoundAl9FeSi3,whichwere.veryfineanduniformlydistributed.

简介：

简介：Epoxy/graphenenanoplatelets(GNP)粉末涂层用GNP和融化混合挤出方法的超声的predispersion被制作。epoxy/GNPs粉末涂层的等温的治好动力学借助于即时Fourier变换被监视有一个加热房间的红外线的光谱学(英尺红外)。epoxy/GNPs的机械性质治好涂层被调查了，由评估他们有扫描在three-point-bending测试以后的电子显微镜学(FE-SEM)的地排放的破裂表面。epoxy/GNPs的热稳定性治好涂层被thermo-gravimetric分析(TGA)学习。等温的治好动力学结果证明GNP不影响自动催化的反应机制，但是在玩的1.0wt%添加剂下面装载GNP在治好epoxy/GNPs粉末涂层的一个提示角色。破裂紧张，破裂坚韧和epoxy/GNPs的影响抵抗治好在装载的GNP(1wt%)的底层戏剧性地增加的涂层，显示GNP能改进epoxy/GNPs粉末涂层的坚韧。从破裂表面的FE-SEM研究，而且，epoxy/GNPs的可能的韧化机制治好涂层被建议。TGA结果证明GNP的加入改进了治好的涂层的热稳定性。因此，GNP修改了环氧基树脂能是一条有效途径与改进他们的热稳定性一起韧化环氧基树脂粉末涂层。

简介：TheultrafineWC—Cocompositepowderwassynthesizedbyanewlydevelopedrapidroutebasedoninsitureactions.Byusingtheas-synthesizedcompositepowder,thegranulationprocessingwasthencarriedouttopreparetheultrafine-structuredthermalsprayingfeedstock.Theinfluencesoftheheat-treatmentprocessondensityofthefeedstockpowder,phaseconstitutionandwearresistanceoftheresultantWC—Cocoatingsfabricatedbyhighvelocityoxy-fuel(HVOF)wereinvestigated.Theresultsshowedthatincreasingtheheatingtemperatureandextendingtheholdingtimeleadedtoremarkableincreaseinthedensityandflowabilityofthefeedstockpowder.Asaresult,thedecarburizationofthein-flightparticlescouldbedecreasedandthewearresistanceofcoatingwassignificantlyenhanced.Thepresentstudydemonstratedthatthedevelopedtechniquesfortheultrafinepowderanditsthermal-sprayedcoatingshadverypromisingapplicationsinscalinguptoproduceultrafine-structuredcermetcoatingswithexcellentperformance.

简介：Inthiswork,hotisostaticpressing(HIPing)techniquewasusedtodensifytheTi_2AlNbpre-alloyedpowder.TheinfluenceofHIPingloadingrouteparameters(temperatureandratesofheatingandpressurizing)onmicrostructureandpropertiesofPMTi_2AlNballoyswasstudied.TheresultsshowedthatHIPingloadingrouteparametersaffectedthedensificationprocessandmechanicalproperties(especiallyhightemperaturerupturelifetime)ofPMTi_2AlNballoysinthepresentwork.Afiniteelementmethod(FEM)modelforpredictingthefinaldensificationwasdevelopedandwasusedtooptimizetheHIPingprocedure.

简介：

简介：Anovel,Ti-6A1-4V(Ti64)/Hydroxyapatite(HAat5%byweightconcentration)metal/ceramiccompositehasbeenfabricatedusingelectronbeampowderbedfusion(EPBF)additivemanufacturing(AM):specifically,thecommercialelectronbeammelting(EBMR)process.InadditiontosolidTi64andTi64/5%HAsamples,fourdifferentunitcell(model)open-cellularmeshstructuresfortheTi64/5%HAcompositewerefabricatedhavingdensitiesrangingfrom0.68to1.12g/cm^3,andcorrespondingYoung'smodulirangingfrom2.9to8.0GPa,andcompressivestrengthsrangingfrom-3to11MPa.ThesolidTi64/5%HAcompositeexhibitedanoptimaltensilestrengthof123MPa,andelongationof5.5%incontrasttoamaximumcompressivestrengthof875MPa.Boththesolidcompositeandmeshsamplesdeformedprimarilybybrittledeformation,withthemeshsamplesexhibitingerratic,brittlecrushing.Solid,EPBF-fabricatedTi64sampleshadaVickersmicroindentationhardnessof4.1GPawhiletheTi64/5%HAsolidcompositeexhibitedaVickersmicroindentationhardnessof6.8GPa.ThelowestdensityTi64/5%HAcompositemeshstrutsectionshadaVickersmicroindentationhardnessof7.1GPa.Opticalmetallography(OM)andseanningelectronmicroscopy(SEM)analysisshowedtheHAdispersoidstobehighlysegregatedalongdomainorgrainboundaries,buthomogeneouslydistributedalongalpha(hcp)plateletboundarieswithinthesedomainsintheTi64matrixforboththesolidandmeshcomposites.Thealphaplateletwidthvariedfrom-5μmintheEPBF-fabricatedTi64to-1.1μmfortheTi64/5%HAmeshstrut.TheprecursorHApowderdiameteraveraged5μm,incontrasttothedispersedHAparticlediametersintheTi64/5%HAcompositewhichaveraged0.5μm.ThisworkhighlightstheuseofEPBFAMasanovelprocessforfabricationofatruecompositestructure,consistingofaTi64matrixandinterspersedandexposedHAdomains,whichtotheauthorsknowledgehasnotbeenreportedbefore.Theresultsalsoillustratetheprospectsnotonlyforfabrica

简介：TiB2ceramicspowderwassynthesizedfromB2O3-TiO2-Mgsystem.TheeffectsofTiB2additionasdiluentonthecombustionsynthesisprocesswereinvestigated.TheresultsofthermodynamiccalculationandexperimentsshowthattheincreaseofTiB2contentrangingfrom0to20wt%canreducetheadiabatictemperatureTadfrom3100Kto2896KandcombustiontemperatureTcfrom2139Kto1621Krespectively.TheparticlesizeandhalfwidthoftheparticledistributionarealsoincreasedwiththeadditionofTiB2increasingfrom0to20wt%.ThecombustionproductisamixtureofTiB2,MgO,andotherintermediatephases.TheleachedproductcontainsmainlyTiB2,TiO2andTiN,anditsoxygencontentis7.77wt%.

简介：

简介：力量的发展和用在在低温度的硫酸盐环境下面的低水文件夹比率的石灰石粉末做的基于水泥的材料的攻击的形式被学习。结果显示当水文件夹比率比0.40低时，有石灰石粉末的基于水泥的材料在为120d在低温度在10%镁硫酸盐答案被浸泡，并且在在200d岁时被浸泡以后在外观有重要变化以后在外观有不足道的变化。扩大损坏和脱落在不同层次发生在具体测试立方体的表面上。当石灰石粉末占大约28%似水泥的材料时，与水文件夹比率的减少，在材料在200d岁时在低温度在镁硫酸盐答案被浸泡以后，压缩力量损失逐渐地减少了。在有不到0.4的水文件夹比率和石灰石粉末卷的标本以后大与20%在200d岁时在低温度在10%镁硫酸盐答案被浸泡比，带攻击的破坏被引起到具体测试立方体的石膏，没有thaumasite硫酸盐攻击。

简介：Anitrate-citratecombustionroutetosynthesizeLa0.9Sr0.1Ga0.8Mg0.2O3-δpowderforsolidoxidefuelcellapplicationwaspresented.Thisrouteisbasedonthegellingofnitratesolutionsbytheadditionofcitricacidandammoniumhydroxide,followedbyanintensecombustionprocessduetoanexothermicredoxreactionbetweennitrateandcitrateions.TheoptimumtechnicalparametersarethatthepHvalueis5,andthemolarratioofcitricacidtothetotalmetallicionis1.5:1.X-raydiffractioncharacterizationofcalcinedgelshowsthatpurephasewassynthesizedaftercalcinationat1400℃for10h,andtheTEMresultshowsthecalcinedpowderwithaverageparticlesizeisabout150nm.Thegrainresistancecontributestothetotalresistanceofsinteredpelletbelow500℃.Theconductivityofthesinteredpellentat800℃was0.07S-1.cm-1higherthantheconductivityofYSZ(0.05S-1.cm-1at800℃)