简介：ByaddingmixtureofZrO2andcarbon,aZr-enhancedcompositecoatingwasproducedontoanAISI1045substratebylasercladding.Themicrostructureandphaseformation,microhardnessandwearresistanceofthecompositecoatingwerestudied.Theexperimentalresultsindicatethatthecompositecoatingwithmetallurgicalbondingtosubstrateconsistsof7-Ni,massiveceramicparticlesofZrC,NiZra,NiTZr〉（Fe,Ni）23C6andF%C.Theinsitu-synthesizedZrCparticlesareuniformlydispersedincompositecoating,whichrefinesthemicrostructureofcompositecoating.WithdifferentZrO2andcarbonaddi-tions,thepropertiesareimproveddifferently.Finally,thefineinsituZrCparticlesimprovethemicrohardnessofcompositecoatingtoHVo.2650,whichisnearly2.7timesthatofNi25coating.Also,thecompositecoatinghasanadvantageinwearresistance;itoffersbetterwearresis-tancewhenmoremixtureofZrO2andcarbonwasaddedinnickelalloys.

简介：CreeppropertyofsolderalloysisoneoftheimportantfactorstoaffectthereliabilityofsolderedjointsinSMT(surfacemounttechnology).Particle-enhancementisawaytoimprovethepropertiesofsolderalloysandhascausedmuchmoreattentionthanbefore.Temperaturesappliedtosolderedjointsareoneoftheprimaryfactorsofaffectingcreeppropertiesofparticleenhancementcompositesolderedjoints.Inthispapersingleshearlapcreepspecimenswitha1mm2cross-sectionalareawerefabricatedusingCuparticleenhancement63Sn37Pbbasedcompositesolderedjointsand63Sn37Pbeutecticsolderedjointstoexaminetheinfluenceoftemperatureoncreepbehaviorofsolderedjoints.ResultsindicatedthatthecreepresistanceofsolderedjointsofCuparticleenhancement63Sn37Pbbasedcompositesolderedjointwasgenerallysuperiortothatoftheconventional63Sn37Pbsolderedjoint.Atthesametime,creeprupturelifeofthecompositesolderedjointwasdeclinedwithincreasingtemperatureanddropfasterthanthatoftheconventional63Sn37Pbeutecticsolderedjoint.

简介：ThesecondphaseparticledispersedinmicroaUoyedsteelhasdifferenteffectsongraingrowthdependingontheirsizeandvolumefractionofthesecondphaseparticleswhichwillchangeduringweldingthermalcycles.Theparticlecoarseninganddissolutionkineticsmodelwasanalyzedforcontinuousheatingandcooling.Inaddition,basedonexperimentaldata,thecoupledequationofgraingrowthwasestablishedbyintrodacinglimitedsizeofgraingrowthwiththeconsiderationofthesecondphaseparticlespinningeffects.UsingMonteCarlomethodbasedonexperimentaldatamodel,thegraingrowthsimulationforheat-affectedzoneofmicroalloyedsteelweldswasachieved.Thecalculatingresultswerewellinagreementwiththatofexperiments.

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简介：有bimodal粒子尺寸的钻石/铜composites的热传导性被学习。composites与40和100颗m尺寸钻石的混合物通过液体铜的压力渗入被准备进钻石预先形成。有钻石的不同coarse-to-fine体积比率的预先形成的渗透被调查。有bimodal尺寸分发的钻石/铜composites的热传导性与从Chu开发的一个分析模型导出的理论价值相比。钻石/铜composites能到达更高热的传导性，他们的表面粗糙能被使用bimodal钻石粒子尺寸改进，这被预言。