Kev txheej txheej evaporation, uas yog ib qho txheej txheem tseem ceeb ntawm kev tso pa tawm ntawm lub cev (PVD), feem ntau yog siv cov thev naus laus zis nqus tsev. Lub twj tso kua mis nqus tsev tsis yog tsuas yog ib qho khoom siv pab xwb tab sis yog lub hauv paus tseem ceeb uas ua rau tag nrho cov txheej txheem no los ntawm kev tsim thiab tswj hwm ib puag ncig molecular uas tswj tau zoo. Nws txoj haujlwm nthuav dav ntau dua li kev tshem tawm huab cua yooj yim, tsim kom muaj cov xwm txheej tseeb uas xav tau rau kev tso cov zaj duab xis nyias zoo.
Qhov laj thawj tseem ceeb rau qhov xav tau lub tshuab nqus tsev siab yog kom ntseeg tau tias cov khoom me me uas tau evaporated mus ncig ncaj nraim. Ntawm qhov siab ntawm huab cua, qhov ceev ntawm cov roj molecules ua rau muaj kev sib tsoo tam sim ntawd thiab random, ua rau cov khoom txheej tawg. Hauv qab lub tshuab nqus tsev siab (feem ntau 10⁻⁴ txog 10⁻⁶ mbar), txoj kev dawb nruab nrab ntawm cov evaporated atoms lossis molecules nce mus txog ntau meters, ua rau lawv mus ncig ncaj qha los ntawm qhov chaw mus rau lub substrate. Qhov no ua rau muaj kev tswj hwm meej ntawm cov zaj duab xis tuab, kev sib xws, thiab cov khoom sib xyaw.
Tsis tas li ntawd xwb, ib puag ncig uas muaj qhov nqus tsev siab tiv thaiv kev oxidation thiab kev ua qias tuaj. Feem ntau cov hlau (piv txwv li, txhuas, chromium) thiab cov tshuaj sib xyaw ua rau muaj kev ua haujlwm ntau ntawm qhov kub thiab txias. Qhov ze ntawm kev tshem tawm cov pa roj ua haujlwm xws li oxygen thiab dej pa ua kom cov khoom tso rau hauv lawv lub xeev huv, hlau, uas yog qhov tseem ceeb rau kev ua tiav cov khoom siv kho qhov muag, hluav taws xob, lossis cov khoom siv kho tshuab hauv cov txheej txheem kawg. Ib puag ncig no kuj muab cov khoom siv huv atomically los ntawm kev tshem tawm cov pa phem, uas yog qhov tseem ceeb rau kev nplaum zaj duab xis muaj zog.
Lub tshuab nqus tsev ua haujlwm ua tus kws kho ib puag ncig. Nws yuav tsum tsim kom sai sai qhov siab uas xav tau, tswj kev ruaj khov los ntawm kev tshem tawm cov pa tawm ntawm cov khoom siv thiab cov khoom siv, thiab tswj cov khoom seem hauv cov txheej txheem ua haujlwm. Qhov kev ruaj khov no yog qhov tseem ceeb rau kev ua haujlwm zoo ntawm ntau yam khoom.
Qhov xav tau kev lim dej tseem ceeb yog los ntawm kev tiv thaiv lub kaw lus no. Cov txheej txheem txheej txheem nws tus kheej tuaj yeem tsim cov khoom me me, cov dej ntws, lossis cov pa dej uas tuaj yeem ua kom sib xyaw. Yog tsis muaj qhov tsim nyoglim dej nkag, cov khoom tsis huv no tuaj yeem rub rov qab mus rau hauv lub twj tso kua mis. Qhov no ua rau muaj kev hnav ntau ntxiv ntawm cov rotors thiab cov hniav, kev ua qias tuaj ntawm cov roj twj (hauv cov tshuab kaw roj), thiab maj mam poob qis ntawm qhov ceev ntawm lub twj tso kua mis thiab qhov nqus tsev kawg. Thaum kawg, qhov no ua rau muaj kev ruaj khov ntawm cov txheej txheem, ua rau lub twj tso kua mis luv dua, thiab ua rau cov nqi kho dua tshiab nce ntxiv. Yog li ntawd, kev teeb tsa cov lim dej tsim nyog - xws li cov lim dej particulate, cov cuab yeej molecular, lossis cov cuab yeej txias - tsis yog xaiv tau tab sis yog kev nqis peev tseem ceeb rau kev tiv thaiv lub twj tso kua mis, xyuas kom meej tias cov txheej txheem zoo sib xws, thiab tiv thaiv lub sijhawm tsim khoom.
Tag nrho hauv txhua yam, cov twj nqus tsev ua rau cov txheej txheej evaporation los ntawm kev muab ib qho chaw huv si, tsis muaj kuab paug, thiab tswj tau rau kev thauj khoom thiab kev tsim zaj duab xis. Kev sib txuas lub peev xwm no nrog lub tswv yim lim dej zoo yog qhov tseem ceeb rau kev ua tiav kev tsim cov zaj duab xis nyias txhim khu kev qha, ua tau zoo, thiab pheej yig.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-25-2025
