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:分光镜并且在钠fluoroborate(SFB)的Nd3+离子的荧光性质眼镜通过光吸收,排放和腐烂大小被准备并且描绘。精力水平分析用免费离子的Hamiltonian模型被执行。试验性的振荡器力量被测量记录的吸收山峰包含的区域决定因为1.0mol.%Nd3+-做了眼镜。Judd-Ofelt参数(2,4,6)被用来评估象放射的转变那样的激光特征参数概率(AR),放射的腐烂时间(R),荧光分叉比率(R)和刺激排放为4F3/2的剖面图(e)亚稳的状态。为Nd3+离子的不同集中的荧光系列被在514.5nmAr+离子激光使样品激动记录。
简介:TheSmBaCuMO5+δ(M=Fe,Co,Ni)(SBCM)powdersweresynthesizedbythecitratesol-gelmethodandthepowdersweresinteredtoceramicpellets.ThepowdersandsinteredceramicpelletswerecharacterizedwithXRD,TEMandSEMmeasurements.ThecathodecatalyticperformancesofSBCMceramicpelletsforammoniasynthesiswerestudiedfromwethydrogenanddrynitrogenatatmosphericpressureandlowtemperature,usingSBCMceramicpelletsascathode,Nafionprotonexchangemembraneaselectrolyte,Ni-Ce0.8Sm0....
简介:Ni-W-P-CeO2-SiO2nano-compositecoatingswerepreparedonthecarbonsteelsurfacebypulseco-depositionofnickel,tungsten,phosphorus,nano-CeO2andnano-SiO2particles.Theinfluenceofnano-SiO2particlesconcentrationsinelectrolyteonmicrostructuresandpropertiesofthenano-compositecoatingswereresearched,andthecharacteristicswereassessedbychemicalcompositions,elementdistribution,depositionrate,microhardnessandmicrostructures.Theresultsindicatethatwhennano-SiO2particlesconcentrationsinelectrolytearecontrolledat20g·L-1,thedepositionratewith27.07μm·h-1andthemicrohardnesswith666Hvofthenano-compositecoatingsarehighest,elementlinescanningandareascanninganalysesshowthattheaveragecontentsofelementsW,P,SiandCeinthenano-compositecoatingsareclose,displayingthatthedistributionofeveryelementwithinthenano-compositecoatingsiseven.Anincreaseinnano-SiO2particlesconcentrationsinelectrolyte(whenlowerthan20g·L-1)leadstorefinementingrainstructureofnano-compositecoatings,butwhenitimprovedto30g·L-1,thecrystallitesizesincreaseagainandinthemeantimetherearealotofsmallbosswithnodulationshapeappearingonthesurfaceofnano-compositecoatings.