简介:摘要目前市场上节能窗的种类繁多,在其组成中,窗框根据用材的不同,分为塑料铝合金、玻璃钢、铝木、铝塑复合窗等,玻璃多数采用中空玻璃。配合热反射镀膜、低辐射LOW-E镀膜、充填氩气代替空气、采用密封条等措施达到更好节能效果。铝合金窗质轻且强度高,耐腐蚀、防火性强、使用寿命长(50-100年),报废后还可高价回收再利用,无任何污染。其是一种符合社会发展方向的节能新型门窗材料,其优点是既有铝合金的强度高、重量轻、美观、耐腐、加工简单,又有隔热的特点,具有非常好的节能效果。
简介:BMIL-53(Fe)/MWCNTshybridmaterialwaspreparedviathesolvethermalsynthesismethod.TheresultingsampleswerecharacterizedbyX-raydiffraction,FT-IRspectroscopy,scanningelectronmicroscopy,UV-Visabsorptionspectroscopy,theBrunauer-Emmet-Tellermethod,andphotoluminescencespectroscopy.TheresultshowedthattheintroductionofmultiwalledcarbonnanotubestotheMIL-53(Fe)canincreasethesurfaceareaofthecomposites,suppresstherecombinationofphotogeneratedelectron-holepairsandpromotetheelectrontransferprocess.ThehybridmaterialshowedoptimalphotocatalyticperformanceinthedegradationofRhodamineBundertheirradiationofultravioletandnaturallight.
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简介:Nb-Ti-Si-based合金粉末被元素的粒子的机械alloying(麻省)准备。形态学,尺寸,阶段成分,雏晶尺寸,格子紧张,作文和内部微观结构的进化,等等,合金,粉末被X光检查衍射(XRD)分析,扫描电子显微镜学(SEM),精力散的光谱学(版本),激光粒子尺寸分析器和传播电子显微镜(TEM)分析。合金粒子逐渐地被精制,他们的形状随milling时间的增加变得球状。Nb稳固的答案(Nbss)的衍射山峰分阶段执行移动向从2~5在球milling期间降低2个角度?h,并且在那Nbss衍射以后,山峰变向更高,有milling的增加的2个角度从5~70预定?h,它主要由于alloying元素原子的溶液被归因于Nbss粉末的格子参数的改变进Nb格子形成Nbss。在球milling过程期间,在雏晶尺寸的减少和粉末导致他们的衍射的连续拓宽的Nbss的格子紧张的增加达到顶点。典型薄片状的微观结构为5在球milling以后在粉末粒子内被形成?h并且变得更多随milling时间的增加精制了并且一致。在40-h-ballmilling以后,典型薄片状的微观结构消失并且很同类的微观结构相反被形成。这同类的微观结构被证明由仅仅使过饱和的Nbss阶段构成。
简介:WehavecarefullyreadthedescriptionoftheproposedmechanismsofhamstringmusclestraininjurybyLiuetal.1andnoticedthattheysuggestthathamstringstraininjuriesmaybeassociatedwithextensivemuscleforceandoccurduringtheearlystancephaseofsprintingwhenthehamstringsarethoughttoworkconcentrically.Wedidnotfindanyevidenceinourextensiveliteraturereviewtosupportthisparticular
简介:TIGweldingwasusedtodepositCo-8.8Al-9.8W-0.2Bsuperalloyon304austenitestainlesssteel.Theformfactorofweld,dilutionratio,microhardness,microstructureanddistributionofalloyingelementswereinvestigated.Themicrostructureofcladdinglayerwasmainlyhypoeutectic.Theprimaryphaseswerecobalt-richsolidsolution.Theeutecticphasewascomposedofcobalt-richsolidsolution,Co6W6CandCoCx.Whentheboroncontentincreasedfrom0.2%to0.5%,thedilutionratiodecreased,theprimaryphasebecamecoarseandthemicrohardnessdecreased.Whentheboroncontentwasfrom0.5%to2%,thedilutionratioandmicrohardnessincreasedobviously,buttheprimaryphasewasrefined.ThehardphaseofCo-8.8Al-9.8Wbecamerefinedandtheamountwasraised,andtheperformanceofcladdinglayerwasimprovedwithappropriateboronincrease.
简介:Inthisstudy,inordertoevaluatetheperformanceofhomogenizedbauxite,twoAl_2O_3-SiC-Ccastableswerepreparedusinghomogenizedbauxiteandbrownfusedcorundumasaggregates,respectively.5mass%andalusitewasintroducedintothetwocastablessoastoresearchtheeffectandmechanismofandalusiteinAl_2O_3-SiC-Ccastables.Theresultsshowedthat:(1)comparedwiththebrownfusedcorundumbasedcastables,thehomogenizedbauxitebasedcastableshadhighercoldstrengthafterheattreatment,butlowerhotmodulusofrupture;(2)additionof5mass%andalusitecouldenhancethecoldandhotmodulusofrupture,improvethethermalshockresistance,andoptimizethemicrostructureofspecimens;(3)themullitizationofandalusitewasnotobviousinthecastablesfiredat1100-1400℃.