简介:Metalsilver(Ag)wasaddedintoSm0.5Sr0.5CoO3(SSC)bynitratepyrolysismethodtoobtainporouscathodematerial(SSC-Agx)forSOFC.ThecompositephasesinthesematerialsofSSC-AgxwereidentifiedbyX-raydiffraction.ThemicrostructureofanelectrodeonCe0.sSm0.2O1.9intermediatetempera-tureelectrolytebyspraymethod,polarizationcurveandtheimperaturepedancespectraatlowandintermediate(500-800℃)wereinvestigated.Theresultsshowthatthematerialcontaining20%Agexhibitsthebestelectrochemicalproperties,itstotalimpedanceofcathodeisonly1/11ofSSCat600℃,andaquarterofSSCsat750℃.Thecompositetech-niqueofcathodeSm0.5Sr0.5CoO3addedwithAgisanefficientmethodtoimprovethecathodeperformanceofSOFCsoperatingintherangeofintermediatetempera-ture.
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简介:La1.5Mg17Ni0.5hydrogenstoragematerialswerepreparedbyhydridingcombustionsynthesis(HCS)andmechanicalalloying(MA)methodrespectively.TheexperimentalresultsshowthatthehydrogenabsorptionpropertiesofLa1.5Mg17Nio.5preparedbyMAarebetterthanthatbyHCS.La1.5Mg17Nio.5preparedbyMAcanabsorb6.73mass%hydrogenat523Kwithin1min,and4.92mass%hydrogenat423K.TheimprovementofhydridingpropertiesofLa1.5Mg17Ni0.5alloypreparedbyMAcanbeascribedtotheformationofnano-crystallineanddefectsduringthemechanicalalloying.
简介:介绍大冶有色30万t铜电解进液系统,结合实际和查阅文献,分析了主进液管道结垢的因素,指出最严重的部分管道以及产生的原因。工艺管道的结垢会影响电解的关键工艺参数-电解液循环流量,所以需要隔一段时间进行管道清垢检修处理。在考虑检修时间、成本和产量等因素上,分析整体更换、拆除清理和开孔冲洗三种检修方案的优缺点,结合生产条件制定了铜电解主进液管道检修方案——不停产冲洗。通过对工艺设施进行精确测量,并提前制作好备件,对阳极板供应进行及时预测,合理排出检修的计划,精心进行组织,达到了缩短检修时间、降低检修成本、确保产量和顺利完成主进液管道检修的目的。