简介：Anumberoftechniqueshavebeendevelopedtosynthesizenanocrystallinebulkmaterials,includinginert-gascondensationandconsolidation,electrodeposition,severeplasticdeformation,crystallizationofamorphoussolid,surfacemechanicalattrition,andpowdermetallurgy.However,itishardtoproducethebulkwithcontrollablenanostructures,especiallywiththegrainsizescontrollableinawiderangebelow100nm.Intheconventionalpowdermetallurgy,duetothefactthatrapidcoarseningoftheparticles...
简介：TheultrafineWC—Cocompositepowderwassynthesizedbyanewlydevelopedrapidroutebasedoninsitureactions.Byusingtheas-synthesizedcompositepowder,thegranulationprocessingwasthencarriedouttopreparetheultrafine-structuredthermalsprayingfeedstock.Theinfluencesoftheheat-treatmentprocessondensityofthefeedstockpowder,phaseconstitutionandwearresistanceoftheresultantWC—Cocoatingsfabricatedbyhighvelocityoxy-fuel(HVOF)wereinvestigated.Theresultsshowedthatincreasingtheheatingtemperatureandextendingtheholdingtimeleadedtoremarkableincreaseinthedensityandflowabilityofthefeedstockpowder.Asaresult,thedecarburizationofthein-flightparticlescouldbedecreasedandthewearresistanceofcoatingwassignificantlyenhanced.Thepresentstudydemonstratedthatthedevelopedtechniquesfortheultrafinepowderanditsthermal-sprayedcoatingshadverypromisingapplicationsinscalinguptoproduceultrafine-structuredcermetcoatingswithexcellentperformance.
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![Li-ion storage performance and electrochemically induced phase evolution of layer-<b style='color:red'>structured</b> Li[Li0.2Mn0.54Ni0.13Co0.13]02 cathode material](/image/thesis5 "Li-ion storage performance and electrochemically induced phase evolution of layer-<b style='color:red'>structured</b> Li[Li0.2Mn0.54Ni0.13Co0.13]02 cathode material")