简介：精轧机组轧制速度很高,要求硬质合金辊环具有热传导性能好,在高温状态下硬度下降少,耐热疲劳性能好,耐磨性好,强度高,适用于高速轧制等特点。影响硬质合金辊环使用寿命的因素很多,本文着重介绍硬质合金辊环材质、轧制量以及修磨量等参数设计方法及其在高速线材精轧机组的应用。

简介：综述了粉末注射成形技术的工艺特点、技术现状以及在硬质合金异型产品制备中的应用,分析了钨钴硬质合金注射成形过程中存在的缺陷控制、碳含量控制、尺寸精度控制和提高制品力学性能等难点问题并给出了相应的的解决方法.并对硬质合金注射成形技术的发展方向和前景进行了展望.

简介：Ni-Ti形状记忆合金由于有特殊的形状记忆效应和良好的机械性能成为受到很大关注的功能材料。尽管Ti-Ni合金已经被研究了很多年,至今,仍然有很多有趣的现象并没有得到很好的认识,尤其Ni-Ti合金在不同温度下的应力应变曲线的因素的研究上还有很多没有解释清楚的问题。为此笔者在文中详细介绍了Ni-Ti形状记忆合金的应力与应变关系实验的准备,实验过程,以及实验结果的获取。并对实验结果进行了分析总结,得出Ni-Ti形状记忆合金在不同应力及应变速度下的特性数据,为形状记忆合金的应用提供了必要的参考。

简介：ThetransportpropertieswerestudiedforrareearthmanganeseoxideLa0.67Cao.33Mn1-xFexO3(x=0-O.3)systems.ItisfoundthatwithincreasingFe^3+-dopingcontentx,theresistanceincreasesandtheinsulator-metaltransitiontemperature(T1M)shiftstolowertemperature.Ifthedopingcontentissmall,thetransportpropertiesmanifestmetalliccharacteristicsinthetemperaturerangeofT＜T1M,whiletheywillobeyathermalactivationmodelinthetemperaturerangeofT＞T1M.SuchabehaviormaybeattributedtotheFe^3+-dopingandpossibleMnionsscatteringtoelectrons.TheFe^3+dopingmayleadtotheformationofFe^3+-O^2--Mn^4+channels,whichcouldterminatethedoubleexchangeMn^3+-O^2--Mn^4+channels.TheantiferromagneticclustersofFeionsmayinducetheMnionstoscettertotheelectrons.

简介：Thephasesandmagnetocaloriceffectinthealloys(Gd1-xErx)5Si1.8Ge2.2withx=0,0.1,0.2and0.3wereinvestigatedbyX-raydiffractionanalysisandmagnetizationmeasurement.ThesamplesweresinglephasewiththemonoclinicGd5Si2Ge2-typestructure.WiththeincreaseofErcontent,theCurietemperature(Tc)decreasedobviouslyfrom253Kofthealloywithx=0to114Kwithx=0.3.Themaximummagneticentropychangedinthesamplesof(Gd1-xErx)5Si1.8Ge2.2withx=0.0,0.1,0.2and0.3were6.88,8.32,9.59and10.24J·kg-1·K-1respectivelyintheappliedfieldchangeof0～2.0T.

简介：ToimprovethemechanicalpropertiesofWC-Al2O3composites,theeffectsoftraceamountofCeO2additivesonthemicrostructureandmechanicalpropertiesoftheWC-Al2O3compositespreparedbyhotpressingwereinvestigated.TheresultsrevealedthattheWC-Al2O3compositesdopedwith0.1%CeO2possessedrefinedmicrostructureandenhancedmechanicalpropertiescomparedwiththatoftheundopedWC-Al2O3composites.TraceCeO2suppressedthedecarburizationofWC,promotedthemicrostructuralrefinement,andimprovedtheinterfacecoherenceoftheWCmatrixandAl2O3.When0.1%CeO2wasaddedtotheWC-Al2O3composites,theeffectofCeO2resultedintheachievementofarelativedensityof98.82%withanexcellentVickershardnessof16.89GPa,combiningafracturetoughnessof9.85MPa·m1/2withanacceptableflexuralstrengthof1024.05MPa.

简介：ThemorphologyandcorrosionbehaviorofNi/Al2O3compositecoatingspreparedusingdouble-pulsedelectrodepositingtechniqueafteroxidizedunder800℃NaCldepositinairenvironmentwereanalyzedbyscanningelectricalmicroscope(SEM),X-raydiffraction(XRD)andenergydispersivespectrum(EDS).TheresultsshowedthatthecorrosionofallcompositecoatingswasacceleratedunderNaCldeposits,andthecorrosionproductswereratherporouswithpooradherencetothematrix.Al2O3particlesinthecoatingscanrefinethegrainsizeandimprovethehightemperaturecorrosionresistanceofthecoatings.Withinthetestscope,themoreAl2O3particlesinthecoatings,thelowercorrosionratescouldbeobtained,andthecorrosionmechanismwasalsodiscussed.

简介：研究不同碳源下Al2O3-SiC-C铁钩料的性能。分别以球沥青、焦炭和炭黑为碳源,比较了常温下三者的显气孔率、抗折和抗压强度。结果表明,不同种类碳源将对试样的气孔率和抗折强度产生不同程度的影响。

简介：AseriesofCe-Fe-Zr-O(x)/MgO(xdenotesthemassfractionofCe-Fe-Zr-O,x=10%,15%,20%,25%,30%)complexoxideoxygencarriersforselectiveoxidationofmethanetosynthesisgaswerepreparedbytheco-precipitationmethod.ThecatalystswerecharacterizedbymeansofX-raydiffractionandH2-TPR.TheXRDmeasurementsshowedthatMgFeO4particleswereformedandFe2O3particleswelldispersedontheoxygencarriers.Thereactionsbetweenmethanedilutedbyargon(10%CH4)andoxygencarrierswereinvestigated.SuitablecontentofCeO2/Fe2O3/ZrO2mixedoxidescouldpromotethereactionbetweenmethaneandoxygencarriers.Therearemainlytwokindsofoxygenofcarriers:surfacelatticeoxygenwhichhadhigheractivitybutlowerselectivity,andbulklatticeoxygenwhichhadloweractivitybuthigherselectivity.Amongallthecatalysts,Ce-Fe-Zr-O(20%)/MgOexhibitedthebestcatalyticperformance.Theconversionofthemethanewasabove56%,andtheselectivityoftheH2andCOwerebothabove93%,theratioofH2/COwasstableandapproachedto2foralongtime.

简介：ThephotocatalystsK4Nb6017andK4Nb6017dopedwithFe^3+andCr^3+werepreparedbysolidstatereactionandwerecharacterizedbypowderx-raydiffraction,UV-visdiffusivereflectanceandscanningelectronmicroscopy.ThephotocatalyticactivityofK4Nb6O17andK4Nb6O17dopedwithFe^3+,Cr^3+wereinvestigatedwithmethanolaselectrondonorandPtaspromotercatalystunder+400nmUVirradiation.Thedifferenceofphotocatalyticactivitybetweenthemwasalsodiscussed.TheindividualrateofhydrogenevolutionfortheK4Nb6O17,Fe-K4Nb6O17andCr-K4Nb6O17asphotocatalystsare5.35,5.00,6.25mmol·L^-1.h^-1respectively.

简介：ThecompoundSm0.98Fe9.02–xGaxNδ(x=0,0.25,0.5,0.75,1)werepreparedbymelt-spunmethodandsubsequentannealingandnitriding.TheRietveldanalysisshowedthatthelatticeexpansionplayedanimportantroleinimprovingtheCurietemperature.AnobviousdevelopmentoftheCurietemperaturewasobtainedwiththeincreasedGacontentfromx=0–1(ΔTc=90oC).Theoptimumcoercivityofnitrideswasobtainedatx=0.25withthevalueHcj=652kA/m(8.15kOe)afterannealing,whichcorrespondedtoareasonabledistributionofgrainsizesofbothTbCu7-typeSmFe9Nδandα-Fe.However,anexcessofGadopingmightleadtoanabnormalgrowthofα-Fe,whichinturndeterioratedthemagneticproperties.ItwasconcludedthatamoderateGacontentwasveryeffectiveinraisingthecoercivityandCurietemperamentintheTbCu7-typeSm-Fe-N.

简介：试图为高温度的熔融的盐反应堆的安装和电极的建设开发材料，在750和950湩爠晥湩浥湥?瑳敲杮桴湥湩?猠汯摩猠汯瑵潩?瑳敲杮桴湥湩?眠牯?慨摲湥湩?愠摮瀠敲楣楰慴楴湯猠牴湥瑧敨楮杮的Ni-11Fe-10Cu的高温度的氧化行为上的艾尔和Y的效果

简介：Phosphine(PH3)isahighlytoxicairpollutant,commonlyproducedinphosphorouschemicalindustry.Butithasreceivedlessresearchattentionduetoitshandlingdifficultly.COisthemaincontentofthephosphorouschemicalindustrytailgas,theconcentrationofwhichisalwaysmorethan80vol.%,anditcanbethefeedgastoproducevariousvaluableproductssuchasformate,oxalate,andmethanolandsoon.But,PH3isoneoftheimportantbarriers,whichisharmfultothefollowingchemicalprocess.Inordertomakeuseofthetailgas,PH3shouldberemovedfirstly,andCOshouldbecoveredinthewholepurifiedprocedureatthesametime.Inthiswork,themodifiedactivatedcarbon(MAC)wasusedastheadsorbenttoseparatePH3fromthemixturetailgas.SeriesofMACadsorbentswerepreparedfortheadsorptionofPH3,whichloadedCu-FeandCe(La),orseparately.ThePH3adsorptioncapacities,chemicalandphysicalpropertiesofMACwereallinvestigated.Theresultsshowedthatover99%PH3adsorptionefficiencywasachievedwhenusedMACadsorbents.TheremovalefficiencyandPH3adsorptioncapacityoftheCu-Fe-Ce/AC(20:1:0.4)werebothmuchhigherthanthosemodifiedactivatedcarbons.ThemaximumPH3adsorptioncapacitywas71mgofPH3/gofMAContheCu-Fe-Ce/AC,whichweremuchhigherthanliteraturedatausingCuOonlyforadsorbinghydridegases.

简介：在Mn3O4生产中用欧姆龙C200H可编程序控制器控制生产工艺和设备，降低消耗，提高生产效率和产品质量

简介：ThestructureandhydridingperformanceofLa0.6Nd0.4Ni4.8Mn0.2Cux(x=0～0.4)alloyswereinvestigatedinordertodevelopsuitablematerialsformetalhydrideairconditioner.TheeffectofCuadditiononthecrystalstructure,equilibriumpressure,hydrogencapacityandhysteresisaswellashydrogenabsorption/desorptionkineticsweresystematicallystudiedbyusingthemeasurementofP-Cisotherms,X-raydiffractionandscanningelectronmicroscopy.AstheamountofCuincreases,theplateaupressureincreasesandhydrogenabsorption/desorptionkineticsisimproved,buttheeffectivehydrogenstoragecapacitydecreases.Itisshownthatvariationsinthebasalplaneparameteracanbeusedasanindicationfortheplateaupressurechanges.Withtheincreaseofparametera,theplateaupressuredecreases.ForLa0.6Nd0.4Ni4.8Mn0.2Cux(x=0～0.4)alloysthereisarelationshipbetweentheeffectivehydrogenstoragecapacitiesandtheratiosoftheirunitcellparameterscanda.Theeffectivehydrogenstoragecapacitydecreaseswithincreaseofa/c.

简介：湖南某矿山采选综合废水中含有Zn^2＋、Mn2等重金属离子,其中Mn^2＋含量达15.34mg/L、Zn2含量达5.24mg/L、COD含量181mg/L,废水经“絮凝沉淀-电氧化-电气浮”联合工艺处理后,出水水质达到国家《污水综合排放标准》（GB8978-1996）一级排放标准.新工艺具有除锰效果好、含锰渣不反溶、操作简便、易控制等优点,在矿山废水治理与回用领域具有良好的应用前景.

简介：研究了合金成份、添加元素及其数量、混合料制备方法、HIP处理等对合金性能的影响。经研究得出:在W-Ni-Fe（W含量为90％～97％）三元合金中加微量元素后,与相同钨含量而未加元素的合金相比,σb提高了大约一倍,δ提高得更为显著,σ0.2略有增加。在相同合金中微量元素的增加,对σ0.2、σb无明显影响,但δ增加了约一倍。经研究确定出:含钨93％以上的合金,为获得优良的性能,应采取湿磨混料方法;对于相对密度较低的W-Ni-Fe合金,采用HIP处理,才可提高其性能。

简介：2006年7月，江西省发改委核准赣州昭日稀土新材料有限公司年产2000吨稀土钕铁硼合金项目。

简介：相对于众多其他合金，铝合金的时效硬化模型经过近几十年的发展已日趋成熟。利用现有模型可以计算球形、片状和针状析出相的尺寸及体积分数与合金成分、时效时间及时效温度的关系，从而可以研究铝合金的屈服强度在时效过程中的演变规律，对铝合金的设计具有重要的指导意义。该文详细地介绍了铝合金时效硬化模型的发展，并指出了现有模型的不足之处，对模型的未来发展进行了展望。

简介：通过对加热、控制轧制和控制冷却等工艺进行优化，使Φ5．5mm合金焊丝钢ER69A强度显著下降，塑性提高，获得用户认可。