简介:纤维素醚广泛地习惯于臼明确的表达,并且理解在纤维素醚和水泥粘贴之间的相互作用是重要的。英尺红外系列,热分析和SEM被用来在HEMC和HPMC在这篇文章修改的水泥粘贴调查水和产品。结果证明在修改水泥粘贴的水和产品与在未修改的水泥浆糊,而是主要水和产品的那些是最后相同的,例如CH(氢氧化钙),ettringite和C-S-H,比的在修改水泥粘贴显得以后在未修改的水泥浆糊。纤维素醚减少外部产品和增加C-S-H胶化的内部产品。比作未修改的水泥粘贴,没有新产品在现在的实验在修改水泥粘贴被发现。HEMC和HPMC调查几乎在波特兰水泥的水和产品上显示出一样的影响。
简介:Thepermeabilityoflightweightaggregateconcretewasstudied.Someeffortsweretakentoincreasetheresistanceoflightweightaggregateconcrete(LC)towaterpenetrationbyusingthemineraladmixturesofflyash,granulatedblastfurnaceslagorsilicafume.Acceleratedchloridepenetrabilitytestandliquidatmospherepressmethodwereusedtostudytheanti-permeabilityoflightweightaggregateconcrete.Theexperimentalresultsshowthatflyash,granulatedblastfurnaceslagandsilicafumecandecreasethepermeabilityoflightweightaggregateconcrete,buttheeffectofgranulatedblastfurnaceslagispoor.AccordingtotheSEMandporestructureanalyzingresults,aninterfaceself-reinforcingeffectmodelwaspresentedandthereinforcedmechanismofmineralmixtureonLCwasdiscussedaccordingtothemodeldescribedbyauthors.
简介:答案的二种类型(ZnSO<潜水艇class=“a-plus-plus”>4,MgSO<潜水艇class=“a-plus-plus”>4)被选择在愈合的电极淀积上学习矿物质混合的影响具体裂缝的效果。四个参数(ie,重量获得的率,表面涂层,充满深度的裂缝闭合和裂缝)被测量。在裂缝的电沉积的矿物质作文被分析。学习证明有10%苍蝇灰的臼标本的愈合的效果是最糟,当没有苍蝇灰,有20%苍蝇灰的臼标本的愈合的效果比标本的好时。重量获得,表面涂层,充满深度的裂缝闭合和快克的率与增加扎根的成粒的强风炉子炉渣(GGBS)的内容减少。矿物质混合没在沉积物的作文上有影响。
简介:Theepoxynanocompositeswithsimilaramines(CH_3(CH_2)_(17)NH_2andCH_3(CH_2)_(17)N(CH_3)_3CI)treatedmontmorilloniteclayshavebeeninvestigatedbywide-angleX-rayscattering,transmissionelectronmicroscopy(TEM),differentialscanningcalorimetry(DSC)andthermalgravimetricanalysis(TGA).Differentnanocompositestructures,intercalationandexfoliationwereformedbythereactionofoctadecyltrimethylammoniumchloride-exchangedandoctadecylamine-exchangedclayswithepoxyresinandphenalkamineasthecuringagent,respectively.Resultsshowedthattheexfoliatednanocompositecanbeobtainedwhenoctadecylaminewiththelowerpolaritywasusedasamodifier.However,theintercalatednanocompositecanbeobtainedwhenoctadecyltrimethylammoniumchloridewithhigherpolaritywasusedasamodifier.
简介:以便降低polyamic酸(泛美航空公司)的imidization温度,治好的代理人p-hydroxybenzoic酸(公众房产管理局)的催化活动,喹啉(QL),benzimidazole(双性人),benzotriazole(BTA),triethylamine(et3N)并且1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)在泛美航空公司的热imidization的过程被调查。另外,热稳定性和结果的polyimide(PI)的机械性质上的这些各种各样的治好代理人的效果拍摄被决定。喹啉被发现是在为综合的二拍子的圆舞方法的使用的一台有效治好加速器PI。由于它的中等基础力量,低位的拥挤效果和中等沸腾点,喹啉不能仅仅加速泛美航空公司在180点完全完成imidization?
简介:Theinfluenceofthegrainboundaryonthefatiguebehaviorwasstuiedbytwothree-point-bending(TPB)specimens.OneTPBspecimenwasnamedBicrystal1,whosepre-crackwasalongthegrainboundaryandtheappliedloadparalleledtopre-crackdirection,whiletheotherTPBspecimenwasnamedBicrystal2,whosethepre-crackwasperpendiculartothegrainboundaryandtheappliedloadparalleledalsotothepre-crack.ItwasfoundthattherateofthefatiguecrackgrowthofBicrystal1wasaboutatenfoldhigherthanthatofBicrystal2.ThefatiguebehaviorofBicrystal2specimenswasdependentonthedistancebetweenthecracktipandgrainboundary.Thecrackgrowthratewashighestwhenthecracktipwasatacriticaldistancetothegrainboundary,whiletheratewasthelowestwhenthecracktipreachedgrainboundary.Afterthecrackwasoverthegrainboundary,thecrackgrowthrateincreased.Thecrystallographicfiniteelementmethodwasappliedtoanalyzethestressandstrainstructureaheadofthecrack,inordertorevealtheabovecharacteristicsofthefatiguebehavior.Itisthegrainboundary-inducedredistributionofstressesnearthecracktipthatinducesthedifferenceoffatiguebehavior.
简介:Self-lubricatingcoatingshavebeenwidelyusedtoreducefrictioninmovingmachineassemblies.However,thetribologicalperformanceofthesecoatingsisstronglydependentontheservicetemperature.Inthispaper,anextensivereviewpertainingtotheinfluenceofoperatingservicetemperatureontribologicalperformanceofself-lubricatingcoatingshasbeencarriedout.Basedontheeffectivelubricatingtemperaturerange,theself-lubricatingcoatingsdevelopedinthepasthavebeendividedintothreegroups:lowtemperaturelubricantcoating(from-200℃toroomtemperature),moderatetemperaturelubricantcoating(fromroomtemperatureto500℃)andhightemperaturelubricantcoating(〉500℃).Ideasconcerningpossiblewaystoextendtheoperatingtemperaturerangeofself-lubricatingcoatingshavebeenpresentedasfollows:hybridizedtribologicalcoating,adaptivetribologicalcoatings,anddiffusionratelimitedsolidlubricantcoating,inaddition,anewself-lubricatingcoatingformulationforpotentialapplicationatawideoperatingtemperaturerangehasbeenproposed.
简介:在相等的压缩力量的前提上把臼的力量弄弯上的矿物质混合的影响被调查。三矿物质混合(苍蝇灰,扎根的成粒的强风炉子炉渣和钢炉渣)被使用。在这研究的矿物质混合的增加的数量从22.5%~60%,并且water-to-binder比率从0.34~0.50。与相等的压缩力量,不同的臼能与他们的弯曲力量在如此的一份下降订单被安排:水泥苍蝇灰臼,水泥臼,cement-GGBS臼,和水泥钢炉渣臼。与一样的压缩力量,越高钢炉渣内容和water-to-binder比率,越多降低臼的弯曲力量。然而,矿物质混合内容的效果和水泥苍蝇灰臼和cement-GGBS臼的弯曲力量上的water-to-binder比率是远不引人注目的。
简介:Thebondingofsteelplatetoaluminumliquidwasconductedusingrapidsolidification.Theinfluenceofdiffusiontimeoninterfacialstructurewasstudied.Theresultsshowedthatundertheconditionof750℃forthetemperatureofaluminumliquidand200℃forthepreheattemperatureofsteelplate,whendiffusiontimewasshorterthan4.3s,therewasonlyFe-Alsolidsolutionattheinterface.Whendiffusiontimewaslongerthan4.3s,Fe-Alcompoundbegantoformattheinterface.TherelationshipsbetweendiffusiontimetandthicknessofFe-AlcompoundlayerHareH=-9.72+2.62t-0.08t^2(4.3s≤t≤15s)andH=2.79+0.647t=0.033t^2(t>15s).
简介:Amodelcombinedbothmacroscopictransportandmicrostructuralevolutionisappliedtodescribetheinfluenceofthermosolutalconvectiononmicrostructuralevolutionduringthesolidificationprocess.Firstly,thevolumeaveragemethodandSimpleralgorithmareusedtosolvethemacroscopictransportequation.Thenthecalculatedresultsareincorporatedintothecellularautomaton(CA)modeltosimulatethemicrostructuralevolution.Usingthismodel,asimplecastingingotisappliedtosimulatemicrostructuralevolution.Throughthesimulation,itisfoundthatthethermosolutalconvectionhasastronginfluenceontheredistributionoftemperaturefieldandsolutefield,whichinfluencethesolidificationmicrostructuralevolution.
简介:热卷的多相的钢的机械性质上的热变丑和随后的austempering的影响被调查。处理的Thermo机械的控制(TMCP)被使用一个实验室进行热滚动工厂完成卷减小的三种不同类型,和有我们重新申请的各种各样的等温的成立持续时间的austemperings。结果证明了由多角形的铁酸盐,小粒的巴菌体和大量稳定的保留的奥氏体组成的多相的微观结构能被卷过程控制获得。机械性质与因为保留的奥氏体的稳定,增加变丑的数量增加。最终的张力的力量(sigma_b),全部的延伸(三角洲)和全部的延伸(sigma_b中心点三角洲)到达最大的价值(791MPa,36%和28476MPa百分比,分别地)在最佳的过程。
简介:Fe-Ni-Almixturesashot-pressingsinteringadditivetoTitaniumdiboride(TiB2)werestudied.ItisfoundthatliquidalloyformedunderhightemperaturehardlyhaseffectsonthedensificationbehaviorsofTiB2-independent.Fe-Ni-AladditivejustworksasfillerbetweenTiB2particlesanddoesnotchangetheTiB2-independentsinteringbehaviors.PressingmodehasagreateffectontheliquidflowingbetweenTiB2particles.Multiple-stepspressingmodewillgivemoretimeandspacefortheliquidflowingandimprovetherelativedensityofTiB2-Fe-Ni-Alcermet.