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基于方程求解法确定液态金属浸渗工艺的临界浸渗压力与渗透性（英文）.docx

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基于方程求解法确定液态金属浸渗工艺的临界浸渗压力与渗透性（英文） Introduction Metallicliquidinfiltration,alsoknownasliquidmetalinfiltrationorLMI,isaprocessinwhichamoltenmetalisallowedtopermeateandfilluptheporousmaterial.Thisprocesshaswide-rangingapplicationsinvariousfieldsofscienceandtechnologylikeproductionofceramicmatrixcomposites,hardcoatings,metalmatrixcomposites,etc.Thecriticalinfiltrationpressureandpermeabilityarethetwomostimportantparametersthatdeterminethesuccessofthisprocess.Inthispaper,wewilldiscussthedeterminationofcriticalinfiltrationpressureandpermeabilityusingtheequation-solvingmethod. DeterminationofCriticalInfiltrationPressure Thecriticalinfiltrationpressure(CIP)isdefinedastheminimumpressurerequiredtoinfiltratetheporousmaterialcompletely.Ifthepressureislessthanthecriticalinfiltrationpressure,therewillbeincompleteinfiltrationornoinfiltrationatall.ThedeterminationofCIPiscrucialforsuccessfulLMI.SeveralmethodshavebeenproposedforthedeterminationofCIP,buttheequation-solvingmethodisthemostaccurateandwidelyusedmethod. TheequationsgoverningLMIarebasedonDarcy'slawthatrelatesthefluidflowrateandthepressuregradient.Thegoverningequationsare: Q=K*A*(∆P/L) whereQisthefluidflowrate,Kisthepermeabilityoftheporousmaterial,Aisthecross-sectionalareaoftheporousmaterial,ΔPisthepressuregradient,andListhethicknessoftheporousmaterial. Thepressuregradientisdefinedas: ∆P=S*(P1-P2) whereSisthesurfaceareaoftheporousmaterial,P1isthepressureontheinletside,andP2isthepressureontheoutletside. TodeterminetheCIP,weneedtosolvetheaboveequationsfor∆PandfindthevalueofΔPatwhichtheflowratebecomesmaximum.Themaximumflowratecorrespondstothecompleteinfiltrationoftheporousmaterial.Mathematically,theCIPcanbedefinedas: CIP=(4*K*γ*cosθ)/(π*d) whereγisthesurfacetensionofthemoltenmetal,θisthecontactanglebetweenthemoltenmetalandtheporousmaterial,anddisthecharacteristicporesizeoftheporousmaterial. DeterminationofPermeability Permeabilityisthemeasureoftheabilityofaporousmaterialtoallowthepassageofafluid.Itisoneofthecrucialparametersinthe