简介:Cr2O3-formingferriticstainlesssteelshavebeenwidelyexploredasintermediatetemperaturesolidoxidefuelcells(SOFCs)interconnects.However,theevaporationofchromiascalemightmigratetoandpoisonthecathode,leadingtodegradationofthecellperformance.Inthisstudy,Ni-Co-Fe-Pcoatingsweredepositedontheferriticstainlesssteelbymeansofacost-effectivetechniqueofelectrolessmethod.Theyareexpectedtobeconvertedinto(Ni,Co,Fe)3O4spinelwithahighelectricalconductivityandCTEmatchwithstainlesssteel,whichcanblocktheevaporationofchromiaformedonsteelsubstrateexposedtothecathodeenvironmentoftheSOFC.TheeffectsofpH,massratioofFeSO4/(FeSO4+NiSO4+CoSO4)andtemperatureofsolutiononthedepositionrate,compositions,surfacemorphologiesandstructuresoftheNi-Co-Fe-Pcoatingswereinvestigated.TheresultsindicatedthatthedepositionrateincreasedwithincreasingpHwhenpHwaslowerthan9andthenreducedwhenpHwashigherthan9.Thedepositionrateincreasedwithincreasingtemperaturewhentemperaturewaslowerthan80℃andthendecreasedwhentemperaturewashigherthan80℃.ThedepositionratedecreasedwiththeincreaseinmassratioofFeSO4/(NiSO4+CoSO4+FeSO4).ThecoatingsconsistedofNi,Co,FeandP.Thephasestructureofthecoatingwasamorphous.
简介:随着钢铁产能的不断扩大,焦炭需求量大幅上升,炼焦煤资源日趋紧张,价格不断攀升,炼铁燃料成本,已成为影响炼铁成本的主要因素,而高炉采用富氧喷煤技术后,可以用低价的无烟煤或烟煤代替部分焦炭,从而减少焦炭消耗量,实现炼铁成本的下降。目前,喷煤比较好的高炉,喷煤比维持在160—200kg/t·Fe的水平,最高煤比已达到260kg/t·Fe以上,取得了较好的经济效益和社会效益。高炉实现富氧喷煤后,高炉喷煤比和煤焦置换比,也成为了高炉喷煤新的攻关目标。随着高炉喷煤比的提升,高炉生产对人炉矿石和焦炭的质量要求也越来越高,给精料提出了更高的要求,同时随着喷煤比的上升,未燃煤粉量上升,煤焦置换比不断下降,高炉炉况稳定性下降,喷煤的经济性也因喷煤比的上升而下滑。
简介:目的介绍甲醛-副玫瑰苯胺光度法测定二氧化硫结果的不确定度评定方法,为建立有效的质量控制方法提供科学依据。方法确定和计算测定过程各不确定度分量,最后整体合成。结果甲醛-副玫瑰苯胺光度法测定二氧化硫标准样品的不确定度为0.036mg/m^3。