Thaum lub sijhawm txheej evaporation, qhov nucleation thiab kev loj hlob ntawm cov txheej zaj duab xis yog lub hauv paus ntawm ntau yam kev siv tshuab txheej ion
1. Kev tsim cov nucleation
Intxheej txheem nqus tsev evaporation, tom qab cov khoom me me ntawm zaj duab xis tau evaporated los ntawm qhov chaw evaporation hauv daim ntawv ntawm cov atoms, lawv ya ncaj qha mus rau qhov workpiece hauv qhov chaw nqus tsev siab thiab tsim cov zaj duab xis txheej los ntawm nucleation thiab kev loj hlob ntawm qhov chaw ntawm workpiece. Thaum lub sijhawm nqus tsev evaporation, lub zog ntawm cov zaj duab xis txheej atoms khiav tawm ntawm qhov chaw evaporation yog li 0.2 eV. Thaum qhov kev sib koom ua ke ntawm cov khoom me me ntawm cov zaj duab xis txheej yog ntau dua li lub zog sib txuas ntawm cov atoms ntawm cov zaj duab xis txheej thiab cov workpiece, tsim ib lub nucleus kob. Ib lub atom txheej zaj duab xis ib leeg nyob ntawm qhov chaw ntawm cov workpiece rau lub sijhawm ua qhov kev txav tsis tu ncua, diffusion, migration, lossis kev sib tsoo nrog lwm cov atoms los tsim cov atoms clusters Tus lej ntawm cov atoms hauv cov atoms cluster ncav cuag qee qhov tseem ceeb, lub nucleus ruaj khov yog tsim, hu ua lub nucleus zoo li homogeneous.
du, thiab muaj ntau qhov tsis zoo thiab cov kauj ruam, uas ua rau muaj qhov sib txawv ntawm lub zog adsorption ntawm ntau qhov ntawm cov khoom ua haujlwm rau cov atoms radioactive. Lub zog adsorption ntawm qhov chaw ntawm qhov tsis zoo yog ntau dua li ntawm qhov chaw ib txwm muaj, yog li nws dhau los ua qhov chaw ua haujlwm, uas yog qhov zoo rau kev nyiam nucleation, hu ua heterogeneous nucleation. Thaum lub zog sib koom ua ke sib npaug rau lub zog khi, lossis lub zog khi ntawm cov atoms membrane thiab cov khoom ua haujlwm yog ntau dua li lub zog sib koom ua ke ntawm cov atoms membrane, cov qauv lamellar tau tsim. Hauv cov thev naus laus zis ion plating, cov kob core tau tsim nyob rau hauv feem ntau.
2. Kev Loj Hlob
Thaum lub plawv ntawm zaj duab xis tau tsim, nws txuas ntxiv loj hlob los ntawm kev ntes cov atoms tshwm sim. Cov kob loj hlob thiab sib koom ua ke los ua cov hemispheres loj dua, maj mam tsim cov txheej kob hemispherical uas nthuav dav hla qhov chaw ntawm cov khoom ua haujlwm.
Thaum lub zog atomic ntawm cov txheej zaj duab xis siab, nws tuaj yeem nthuav dav txaus rau ntawm qhov chaw thiab zaj duab xis du thiab txuas ntxiv tuaj yeem tsim thaum cov pawg atomic tom ntej me me. Yog tias qhov sib txawv ntawm cov atoms ntawm qhov chaw tsis muaj zog thiab qhov loj ntawm cov pawg tso nyiaj loj, lawv muaj nyob ua cov nuclei loj peninsular. Sab saum toj ntawm cov kob core muaj qhov cuam tshuam zoo rau ntawm qhov concave, uas yog "duab ntxoov ntxoo". Qhov projection ntawm qhov chaw yog qhov zoo dua rau kev ntes cov atoms tso nyiaj tom qab thiab kev loj hlob nyiam, ua rau muaj qib ntawm concavity ntawm qhov chaw los tsim cov conical lossis columnar crystals ntawm qhov loj txaus. Cov voids nkag mus tau tsim ntawm cov conical crystals thiab qhov roughness ntawm qhov chaw nce ntxiv. Cov ntaub so ntswg zoo tuaj yeem tau txais ntawm qhov nqus tsev siab, nrog rau qhov txo qis ntawm qib nqus tsev, cov microstructure ntawm daim nyias nyias ua tuab dua thiab tuab dua.
Lub sijhawm tshaj tawm: Tsib Hlis-24-2023