简介：Si_3N_4-Si_2N_2Ocomposites被液相sintering(LPS)与非结晶的缩放nano的氮化矽粉末制作。Si_2N_2O阶段被in-situreaction2Si_3N_4(s)+1.5O_2(g)=3Si_2N_2O+N_2(g)产生直到在体积的60percent的Si_2N_2O阶段的内容在1650t的sintering温度被获得并且当sintering温度增加了或减少时，减少了，显示反应是可逆的。集体损失，相对密度和平均谷物尺寸与增加sintering温度增加了。当sintering温度在1700degC下面时，Theaverage谷物尺寸是不到500nm。Thesintering过程包含复杂结晶化和阶段转变：非结晶的氮化矽->equiaxialalpha-Si_3N_4->equiaxial->Si_3N_4->杆--相似Si_2N_2O->像针的beta-Si_3N_4。小回合--塑造的beta-Si_3N_4粒子在Si_2N_2O谷物被骗诱，界定差错的高密度位于在1650degC的sintering温度的Si_2N_2O谷物的中间。坚韧在1600degCto7.2MPa从3.5Mpa中心点m~(1/2)增加了在1800degC的中心点m~(1/2)。坚硬在1600degC象21.5GPa(Vickers)一样高。

简介：Throughmeasuringthecoefficientoflinearexpansion,thestructureandpropertiesoftheLi2O-Al2O3-SiO2lowexpansionglassceramicscontainingB2O3arestudiedbyJRandXRD.ItisshoutnthattheIRmethodisefficientinthestudyoftheglass-ceramicsstructure.Thereisa"Boronabnormality"inthesystemwhichhasanimportantinfluenceonthepropertiesoftheglass-ceramics.

简介：以超重力场辅助燃烧合成技术制备了呈梯度分布的Y2O3-Al2O3-SiO2玻璃／Y3Al5O12陶瓷梯度复合材料。结果表明，梯度布置两种组分的原料既可防止下层熔体的喷溅，又能提高上层玻璃的透过率。该梯度材料沿超重力方向依次为YAS透明玻璃层、YAS-YAG玻璃陶瓷层和YAG陶瓷层。

简介：SiO2-B2O3-Al2O3-CaO在低sintering温度使契约成玻璃，高力量被讨论。FTIR和XRD分析被用来与铝的不同内容描绘基本使成玻璃的契约的结构。弯曲力量和热扩大系数也被测试。同时，在660光线衍射(XRD)的sintering温度的合成标本的微观结构，扫描电子显微镜(SEM)分析和其它工具。结果证明分别地，钾和磷的溶解率在95.64wt%lessthan的一种谷物尺寸的条件下面是70wt%和93.7wt%0.074公里，9.78gg-1硫磺的酸，0.5gg-1铵氟化物，160桴???瑳畲瑣牵獥椠?慭湩慴湩摥映吗？？

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简介：有alloying原子X=C，B，N，O和空缺的镁和它的合金的概括叠的差错(GSF)精力和表面精力用第一原则的方法被调查了。叠的差错精力上的alloying原子和空缺的占优势的减少效果在slip飞机附近在第一层从他们的位置被结果，这被发现。叠的差错精力是将近与纯镁一样当alloying原子和空缺被放在时第二，第三，第4，第5和第6层。O强烈减少Mg的GSF精力，这被显示出。alloying原子C，B和N增加表面精力，但是O和空缺减少Mg的表面精力。Mg和Mg合金的韧性被使用在表面精力和不稳定的叠差错精力之间的比率基于瑞斯标准讨论了。

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简介：研究了Na^＋替代Bi^3＋、Sn^4＋替代Nb^5＋对Bi2（Zn1／3Nb2／3）2O7陶瓷烧结特性、显微结构和介电性能的影响。结果表明，替代后样品的烧结温度从1000℃降低到860℃；在-30～130℃样品出现明显的介电弛豫现象；弛豫激活能在0．3eV左右。用缺陷偶极子和晶格畸变对Na-Sn掺杂Bi2（Zn1／3Nb2／3）2O7的介电弛豫现象进行了解释。

简介：TheantibacterialeffectofcarryingsilverB2O3-SiO2-Na2Oglassmaterialwasstudiedbymeansofantibacterialring,nephelometery,MICvalue,thinfilmattachmentandmicrocalorimetry,respectively.TheexperimentalresultsoffivekindsofantibacterialtestmethodsarealmostidenticalandcanverifythatcarryingsilverB2O3-SiO2-Na2Oglassmaterialexertsanexcellentantibacterialperformance.Antibacterialringandnephelometeryaresimple,quick,buttheprecisionisrestrictive.MICvalue,thinfilmattachmentmethodandmicrocalorimetrycanquantitativelycomparetheantibacterialeffectsoftheantibacterialglassmaterial.Comparedwiththetraditionalmicrobetestmethods,themicrocalorimetrycananalyzetheinhibitingeffectofthecell'sgrowthandmetabolismontheantibacterialglassmaterialbymonitoringthethermaleffectcontinuouslyandautomatically.

简介：Inordertorealizetheco-firingwithAg/Pdelectrodesinmultilayerdevices,Pb(Zn1/3Nb2/3)1-,-yZrxTiyO3(0.25＜x＜0.35,0.25＜y＜0.35)piezoelectricceramics(hereafterdesignatedPZN-PZT)modifiedbyLa2O3hasbeenpreparedbyconventionaltechniquewithsinteringtemperaturefrom1100℃to1140℃.X-raydiffractionpatternsdemonstratedthatpureperovskitephasewasobtained.Secondaryelectronimage(SEI)showedthatcrystallinegrainsinceramicswerewellgrown.d33ofmanufacturedsamplewasashighas560×10-12C/N.kpwasabout0.61andtgδabout30×10-3.TheexistenceofliquidphaseexaminedbyelectrondiffractioninPZN-PZTsampleisbeneficialtosinteringoftheceramic.

简介：Er^3+-dopedSrBi4Ti4O15-Bi4Ti3O12(SBT-BIT-xEr^3+,x=0.00,0.05,0.10,0.15and0.20)inter-growthceramicsweresynthesizedbythesolid-statereactionmethod.Structural,electricalandup-conversionpropertiesofSBT-BIT-xEr^3+wereinvestigated.Allsamplesshowedasinglephaseoftheorthorhombicstructure.RamanspectroscopyindicatedthattheEr^3+substitutionforBi^3+atAsitesofthepseudo-perovskitelayerincreasesthelatticedistortionofSBT-BIT-xEr^3+ceramics.ThesubstitutionofBi^3+byEr^3+leadstoadecreaseofdielectriclosstanδandanincreaseofconductivityactivationenergy.Piezoelectricconstantd33wasslightlyimproved,butdielectricconstantwasdecreasedwiththeEr^3+doping.TheSBT-BIT-xEr^3+ceramicwithx=0.15exhibitstheoptimizedelectricalbehavior(d33~17pC/N,tanδ~0.83%).Moreover,twobrightgreen(532and548nm)andonered(670nm)emissionbandswereobservedunderthe980nmexcitation.Optimizedemissionintensitywasalsoobtainedwhenx=0.15fortheSBT-BIT-xEr^3+ceramic.Therefore,thiskindofceramicsoughttobepromisingcandidatesformultifunctionaloptoelectronicapplications.

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简介：采用反应射频磁控溅射方法，在玻璃基底上成功制备出了氮化铜（Cu3N）薄膜，并研究了溅射参数对Cu3N薄膜的结构和性能的影响，结果显示，随着溅射功率和氮气分压的增加，氮化铜薄膜的择优取向由（111）方向向（100）方向改变。随着基底温度从70℃增加到200℃，薄膜从Cu3N相变为cu相。紫外可见光谱、四探针电阻仪等测试表明，当溅射功率从80W逐渐增加到120W时，薄膜的光学能隙从1．85eV减小到1．41eV，电阻率从1．45×10^2Ω·cm增加到2．99×10^3Ω·cm。

简介：Si3N4/TiCnanocompositeceramicshavebeenfabricatedbyhotpressingtechniquewithAl2O3andY2O3asadditives.TheresultsshowedthatwelldispersedcompositepowderwascarriedoutbyaddingdispersantandadjustingpHvaluesofsuspensions.RemarkableincreaseinflexuralstrengthatroomtemperatureswasobtainedbyaddingnanoparticlesinSi3N4matrixwith10%(wtpct)ofnano-Si3N4and15%ofnano-TiC.Theflexuralstrength,fracturetoughnessandhardnesswere1025MPa,7.5MPa·1/2and15.6GPa,respectively.Themicrostructuresofmaterialswereanalyzedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM),whichindicatedthatTiCnanoparticlesdistributeinthematrixandatthegrainboundaries.Accordingtothefractureform,lowcontentsofnanoparticlescouldrefinematrixgrainsandleadtothecrackdeflectionaswellascrackpinning.Themultiplexmicrostructurewasformedbymixingnano-Si3N4particles.Thecracktrajectoriesexhibitedcrackdeflection,rod-likegrainbridgingandpull-out.

简介：Basedonthedifferenceofhydroxygroupconfigurationondifferentplanesofα-Fe2O3nanoparticles,usingthespecialadsorptionandcoordinationofphosphateonthe(001)planeofα-Fe2O3,well-crystallizedandwelldispersedα-Fe2O3nanodiskswithdiameterof150–200nmandthicknessof40–80nmweresynthesizedviaahydrothermalmethod.Themagneticpropertiesofsynthesizednanodiskswereinvestigated.Itwasfoundthatthenanodiskspossessedasaturationmagnetization(Ms)of0.38emu/g,aremanentmagnetization(Mr)of0.031emu/gandacoercivityof452.91Oeatroomtemperature.TheMrandcoercivityofsynthesizedα-Fe2O3nanodisksarehigherandtheMsislowerthanthoseofotherpreviouslyreportedα-Fe2O3nanostructures.

简介：以便得到TiB2-Al2O3的同质的混合物和协议，一个表面修正方法被用来准备nano规模的杂交Al2O3涂的TiB2粒子。PE蜡粒子是第一到由杂交，然后nano规模Al2O3粒子的TiB2粒子上涂又是涂的到由PE蜡粒子涂的TiB2的表面上。SEM，TEM和版本被用来描绘同样收到的核心/壳粒子和它的协议的微观结构。试验性的结果显示出那粒子规模TiB2和Al2O3的同质的分散能不仅在混合粉末而且在使脱蜡的协议被形成。协议当时是由煤气压的sintering(GPS)的sintered。物件顶端的装饰物产品显示出与参考样品由正常方法制作了作比较的改进技工性质。

简介：MoleculardynamicssimulationusingauniversalforcefieldhasbeenemployedtodeterminethediffusioncoefficientsofO2andNa2SO4vaporintoB2O3andSiCfrom700Kto1273K,respectively.Einsteindiffusionwasobservedina250～300pssimulation.ThediffusioncoefficientfortheO2rangefromabout9.279×10-9cm2/sforB2O3to2.275×10-10cm2/sforSiCataloadingof32moleculespersimulationbox,thatfortheNa2SO4vaporrangefromabout9.888×10-7cm2/sforB2O3to1.837×10-10cm2/sforSiCataloadingof8moleculespersimulationbox.EnvironmentpropertiesofC/SiCcompositewillbeincreasedviatheB2O3preventingthediffusionofO2andNa2SO4vaporintothepyrolyticinterphaseandcarbonfibers.

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