简介：Pr2Fe14B-La2Fe14B系统被衍射(XRD)，微分扫描热量测定(DSC)和扫描电子显微镜学(SEM)与精力装备了的X光检查粉末调查散X光检查光谱学(版本)。水晶结构参数被完整侧面的Rietveld精炼决定。结果揭示了那所有合金(Pr1-xLax)2Fe14B使Nd2Fe14有空格组P42/mnm的B类型结构并且形成了连续固体在x=0.0之间的解决方案并且1.0。格子参数一，c，单位房间体积V和c/a比率与La集中线性地增加了。由thermogravimetry分析决定了，居里温度(TC),阶段转变温度和融化的温度(Pr1-xLax)2Fe14B在La内容之上线性地减少了。基于DSC大小和X光检查粉末衍射考试的结果，Pr2Fe14B-La2Fe14B系统被建立。

简介：Magnetizationanddemagnetizationcurvesandhysteresisloopsapplieddifferentmagnetizing.fieldsinsinteredNd-Fe-BandNd-Dy-Fe-Bmagnetsfromthermallydemagnetizedanddcfield-demagnetizedstateswereinvestigatedattemperaturesofupto150℃.Thefirst-quadrantremagnetizationcurvesandthecurvesofcoerciveforces_MH_CversusrernagnetizingfietdsH_mfromdcfield-demagnetizedstateatroomtemperatureshowasteparoundmagnetizingfieldasabsolutevalueofthemaximumintrinsiccoercivity.Thestepsof_MH_C-H_mcurvesshiftedtolowerremagnetizingfieldsandtheshapesofmagnetizationcurveschangedfromsteptypetoprecipitoustypewhentemperaturewentupto100～150℃orafterthespecimenwasthermallydemagnetizedatatemperaturehigherthantheCurietemperature.Thesteepriseofkneecoereivitywithincreasingmagnetizingfieldisbehindthatof_MH_C.NotethatthemagnetichardeninginsinteredNd-Fe-Bmagnetsiscontrolledbypinningofdomainwalls.

简介：天津开发区的一项最新科技成果——“6000目超细重钙在PVC管件生产中的应用”，日前通过了天津市科委鉴定。该技术成功推出了由这种超细粉体与PVC树脂按1：2比例配制的新型复合材料，以此替代纯粹的PVC树脂生产塑料管件，对于节省石油资源、降低材料成本具有重要意义。

简介：代号为Ｂ３１２的苯乙烯膦酸单仲烷基（Ｃ１１－１３）酯的实用性质表明，Ｂ３１２符合工业萃取剂所应具备的条件。

简介：通过生产过程参数对比,查找宏观原因,并进行解剖,用SEM扫描电镜进行能谱分析,定性分析AAR-B车轮超声检测缺陷的原因,制定改进措施,使产品质量稳定。

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简介：联合国环境规划署6月3日发布（2009年全球可持续能源投资趋势报告》。报告显示，2008年全球能源领域共吸引投资2500亿美元，其中可再生资源吸引投资1400亿美元，占投资总额的56％，而对传统化石燃料的投资为1100亿美元，仅占44％。可再生能源的投资额首次超过化石能源。

简介：文章综述了近年来国内外超细镍粉的制备方法及进展，分别就气相法、液相法和固相法制备超细镍粉的研究方法进行了简要的评述，对其未来发展趋势提出了自己的观点。

简介：Microporoustitaniumdioxidefilmswerepreparedbythesol-gelmethodsonglasssubstrates,usingtetrabutyltitanateassourcematerial.Inordertoabsorbthevisiblelightandincreasethephotocatalyticactivities,differentconcentrationsofneodymiumions(Nd/Timolarratiowas0.5%,0.7%,0.9%,and1.1%respectively)wereaddedintothesol.X-raydiffraction(XRD),X-rayphotoelectronspectros-copy(XPS),andatomforcemicroscopy(AFM)wereappliedtocharacterizethemodifiedfilms.Akindoftypicaltextileindustrypollutant(RhodamineB)wasusedtoevaluatethephotocatalyticactivitiesofthefilmsundervisiblelight.TheresultsshowedthattheactivitiesofthefilmswereimprovedbydopingNdionsintothesol.

简介：采用液相化学还原法，以硝酸银为原料，抗坏血酸为还原剂，聚乙烯吡咯烷酮（Pvp）为分散剂制备超细银粉。用扫描电镜、激光粒度分析仪、振实密度测定仪、比表面积测定仪等对银粉进行表征，研究硝酸银浓度、pH值、纯度对银粉形貌和理化指标的影响。结果表明，硝酸银溶液浓度对超细银粉形貌有很大影响，随着硝酸银溶液浓度升高。生成的小颗粒数量多，团聚现象严重；银粉粒度随硝酸银溶液pH值增大而减小，但pH增大到7．0时，银粉团聚现象严重；照相一级、优级纯硝酸银的杂质元素含量低，制备的超细银粉电镜形貌好，分散性良好，振实高，粒度分布窄且均匀。

简介：Theaimofthisresearchistopulseco-depositnano-CeO2particlesintoNi-W-Balloycoatingsinordertoimprovethesurfaceproperties.Theinfluenceofpulsefrequencyanddutycircleondepositionrate,microhardnessandmicrostructures,andtheinfluenceofheattreatmenttemperatureonphasestructures,microhardnessandabrasivityofNi-W-B-CeO2compositecoatingswereinvestigated.Theresultsindicatedthatthepulseco-depositionofnickel,tungsten,boronandnano-CeO2particlefromthebathwhichnano-CeO2particlewassuspendedbyhighspeedmechanicalstirringledtotheNi-W-B-CeO2compositecoatings,possessingbettermicrohardnessandabrasionresistancewhenheat-treatedat400℃for1h.Themicrohardnessas-depositedwith636Hzandthedepositionratewith0.0281mm·h-1wasthehighestatpulsefrequencywith1000Hzandpulsedutycirclewith10%.Microstructuresanalysisdisplaysthatdecreasingpulsedutycycleleadstorefinementingrainstructuresandtheimprovementofmicrostructures.X-raydiffractionshowsthatthecompositecoatingas-depositedwasmainlyintheamorphousstateandpartiallycrystallized,butwhenheattreatedat400℃,thecrystallizationtrendwasstrengthenedfurther.

简介：对10B21冷镦钢盘条出现的冷镦开裂现象,用光学显微镜、扫描电镜、直读光谱仪对缺陷部位进行了显微组织、化学成分等分析。结果表明,冷镦开裂是由钢坯裂纹缺陷所导致,且通过Ti元素的加入,杜绝了钢坯裂纹的产生。

简介：InordertoimproveandstabilizethemagneticpropertiesofnanocompositeNd2Fe14B/α-Femagneticalloysbyacompositionaladjustment,smallamountofDyand/orCowasaddedtoNd9Fe84B7alloys.DTAanalysisontheamorphousofthealloystookplaceasthesoftmagneticphaseswerecrystallized,andthenthehardmagneticNd2Fe14Bwasprecipitatedfromthem.Whileα-Feandametastable1:7(TbCu7-type)phasewereformedsimultaneouslyinDyandCo-freealloys,theywerecrystallizedseparatelyatdifferenttemperaturesafterDyorCowasadded.ThisphaseseparationoccurredmoreclearlyintheDy-treatedalloysandtheothersoftmagneticphaseFe3BwasalsostabilizedbyDyand/orCo.The1:7phasethatwasstabilizedbyDyand/orCowasnoteliminatedat700℃,decreasingmagneticpropertiesofthealloys.Itwaseventuallydisappearedabove725℃,butFe3Bwasnoteliminatedevenat750℃whenDywasaddedmorethan0.5at%orCowasaddedmorethan2.0at%.AmountofNd2Fe14BinthealloystendedtoincreaseasDyadditionincreased,whereasCoadditiondidnotleadtoanyappreciablechangeintheratioofα-FeandNd2Fe14B.Moreover,DyadditionapparentlyincreasedcoercivityofanalloywhileCoadditionhadabeneficialeffectonremanence.ThegrainsintheDytreatedalloyswereusuallyfinerthanthoseintheCo-treatedalloys.Thegrainsizeofbothα-FeandNd2Fe14Binthealloysexhibitingmr≥0.72wasintherangeof20～40nmorevenlarger50nm,whichislargerthanthetheoreticaloptimumsize(～10nm).TypicalmagneticpropertiesobtainedfromaNd7.5Dy1.5Fe82.5Co1.5B7alloyannealedfor12minat725℃wereiHc=4.85kOe,Br=11.32kG,(BH)max=15.73MGOe,andmr=0.73.

简介：形成，磁性和微观结构上的公司替换和退火的处理的效果(NdDyTb)12.3(FeZrNbCu)快速的熄灭并且随后的退火准备的81.7-xCoxB6(x=015)带子系统地借助于微分扫描热量计(DSC)被调查，X光检查衍射(XRD)，扫描电子显微镜学(HRSEM)和颤动的样品磁强计(VSM)的高分辨率。阶段分析揭示了单相的材料。顽磁极化Jr和最大与从0～12增加x增加了然后为x=15减少了的最大的精力产品(BH)。内在的coercivityHci(NdDyTb)12.3(FeZrNbCu)最佳地处理的81.7xCoxB6带子为x=15为x=0从1308.7kA/m减少了到817.4kA/m。有Jr=1.041T的最佳磁性，Hci=944.9kA/m并且(BH)max=155.1kJ/m3被退火完成在675吠敨琠牥業慮?桴潩?牧畯獰?的融化旋转带子(x=12)??湩琠敨?呐?偍????敷敲椠?楳畴漠楸楤敺?湩潴猠汵潦楮?捡摩朠潲灵?匨??琠？？

简介：EnvironmentalfriendlyrecyclingprocessforNd-Fe-Bsinteredmagnetsludgesgeneratedinthemanufacturingprocess,whichcontainlargeamountofrareearth,includingNd,PrandDy,isbadlyneededsofar.Inpresentstudy,wehavedevelopedaneffectiveroutetoobtainrecycledsinteredmagnetsfromNd-Fe-Bsinteredmagnetsludgesbycalciumreduction-diffusion（RD）process.Comparedtoconventionalrecyclingprocess,ourresearchisfocusedonrecoveringmostoftheusefulelements,includingNd,Pr,Dy,Co,andFetogetherinsteadofjustrareearthelements.Toimprovetherecyclingefficiencyandreducepollution,theco-precipitatingparametersweresimulatedandcalculatedusingMATLABsoftware.Mostofusefulelementswererecoveredbyaco-precipitationmethod,andtheobtainedcompositepowderswerethendirectlyfabricatedasrecycledNd-Fe-Bpowdersbyacalciumreduction-diffusion（RD）method.Therecoveryratesare98%,99%,99%,93%,and99%,forNd,Pr,Dy,Co,andFe,respectively.Theamountofusefulelementscontainedintherecoveredcompositepowdersisgreaterthan99.71wt%.TheprocessofRDforsynthesizingNd2Fe14BandsubsequentlyremovingCaOwasthoroughlyinvestigated.Furthermore,therecycledNd-Fe-Bmagnetexhibitsaremanenceof1.1T,acoercivityof1053kA/m,andanenergyproductof235.6kJ/m3,respectively,indicatingthatrecycledNd-Fe-Bsinteredmagnetwassuccessfullyrecoveredfromtheseverelycontaminatedsludgesviaaneffectiverecyclingroute.

简介：通过实验解读微淬火（超临界淬火）的本质：α→γ相变与磁畴瓦解同步;（高温型）板条马氏体相变与＂司南鱼＂超磁化共生;微淬火（微观层面）囊括了所有已知超塑形变类型,是获取（宏观层面）高频热轧超塑性的最佳工艺;微淬火高频热轧超塑性无须具备诸多苛刻条件,是一种独特的理想的超塑性。

简介：YPO_4phosphorssingle-dopedwithSb~（3＋）orGd~（3＋）andco-dopedwithSb~（3＋）andGd~（3＋）werepreparedbyasolid-statereactionmethod.Thephasepurity,morphology,photoluminescenceexcitationandemissionpropertiesofthepreparedphosphorswereinvestigated.TheresultsshowedthatSb~（3＋）couldsensitizeGd~（3＋）intheco-dopedphosphorswhichmadethephosphorsexcitablebyshort-waveultraviolet（UV）atawavelengthbetween220and260nm.Under253.7nmexcitation,theco-dopedphosphorsY_（1–x–y）PO_4：Sb~（3＋）x,Gd~（3＋）yshowedstrongemissionofGd~（3＋）atawavelengthof312nmwhoseintensitychangedwiththedopingconcentrationsofGd~（3＋）andSb~（3＋）.TheoptimizedY_（0.77）PO_4：Sb~（3＋）0.07,Gd~（3＋）0.16phosphorshowedanintensitycomparabletocommercialLaPO_4：Cephosphor（UVB-315）,makingitapotentialcandidateformercurylow-pressuredischargenarrow-bandUV-Bemittinglamps.

简介：以Na2SnO3·3H2O为原料,有机试剂(正戊醇、正丁醇、环己烷)为分散剂,同时加入阴离子表面活性剂(十二烷基苯磺酸钠,ABS),以氢氧化锡沉淀为前驱体,用水热法制备了粒度均匀的SnO2超细粉体.用X射线衍射(XRD)和扫描电镜(SEM)测定了该粉体的晶型和形貌,研究结果表明,所制得的SnO2为四方晶系金红石结构,颗粒均一性高,粒径分布介于0.8μm～1.0μm之间,且粒子尺寸随着溶液中有机试剂的加入而减小.

简介：香港特区政府拨款9300多万元，于2008年4月开展了一项为期5年的“清洁生产伙伴计划”，为珠三角地区的港资工厂提供技术援助，鼓励及协助珠三角港资工厂采用清洁生产技术及作业方式，减少排放及节省能源。到目前为止，由香港生产力促进局出资协助珠三角港资企业节能减排批核的项目超过了200个。

简介：为了进一步降低生产成本，葫芦岛有色综合利用厂科学论证，创新思路，打破精铋生产中加锌除银工艺的传统，将加入精锌除银改用B号锌代替，可减少成品精锌使用量，减少资金占用，降低生产成本。此项工艺改造于2014年9月份开始实施，葫芦岛有色克服了原料变化产生的影响，通过不断调整工艺参数，摸索B号锌合适的加入量，逐渐稳定了生产工艺。