I. Qhov tseem ceeb ntawm qhov cua sov
Evaporation txheej yog ib qho ntawm cov txheej txheem tseem ceeb hauv lub cev vapor deposition (PVD). Nws lub hauv paus ntsiab lus tseem ceeb yog ua kom sov cov khoom txheej kom evaporate mus rau hauv gaseous atoms lossis molecules, uas tom qab ntawd tso rau ntawm lub substrate nto los ua ib zaj duab xis nyias. Lub tshav kub qhov chaw, uas yog ib feem tseem ceeb muab lub zog, ncaj qha cuam tshuam tus nqi evaporation, zaj duab xis zoo (xws li uniformity, ceev, thiab purity), thiab cov txheej txheem stability.
II. Common Heat Source hom thiab cov yam ntxwv ua haujlwm
Tam sim no, cov khoom siv hluav taws xob feem ntau siv hauv evaporative txheej feem ntau poob rau hauv plaub pawg: cov cua sov ua haujlwm, hluav taws xob hluav taws xob hluav taws xob, hluav taws xob laser, thiab induction cua sov. Due to different heating methods, these heat sources exhibit significant differences in energy density, temperature control accuracy, and applicable materials.
1. Resistance Cua sov qhov chaw
Resistance cua sov siv Joule cua sov tsim los ntawm tam sim no ntws los ntawm cov cua sov (xws li tungsten hlau, molybdenum nkoj, tantalum ntawv, thiab lwm yam) kom indirectly cua sov cov ntaub ntawv txheej. Nws muaj cov qauv yooj yim, tsis tshua muaj nqi, thiab yooj yim rau kev khiav lag luam, ua rau nws haum rau qis - melting- taw tes hlau (xws li txhuas, tooj liab, thiab nyiaj) thiab qee cov ntaub ntawv sib xyaw. However, its energy density is low, making it difficult to evaporate high-melting-point materials, and the heating element may chemically react with the evaporation material, leading to film contamination.
2. Electron Beam Heating Source
Electron beam cua sov siv siab -electron ceev los foob pob ntawm cov khoom txheej, hloov lub zog kinetic rau hauv thermal zog kom ua tiav evaporation. Nws khav theeb lub zog siab heev (txog 10⁴-10⁶ W / cm²), ua kom cov evaporation ntawm siab- cov hlau melting point (xws li tungsten, molybdenum, thiab titanium), ceramics, thiab refractory compounds. Vim hais tias cov khoom raug foob ncaj qha los ntawm lub teeb hluav taws xob, kev kis kab mob los ntawm cov khoom cua sov yog zam, ua rau cov yeeb yaj kiab siab purity. Txawm li cas los xij, cov cuab yeej siv tau yooj yim, tus nqi yog siab, thiab yuav tsum muaj lub tshuab nqus tsev nruj.
3. Laser cua sov qhov chaw
Laser cua sov tsom rau lub siab - lub zog laser beam mus rau saum npoo ntawm cov khoom txheej, siv lub teeb nqus kom ua tiav cov cua sov hauv zos sai thiab evaporation. It offers high energy density, precise and controllable heating areas, and a small heat-affected zone, making it suitable for nanoscale thin film preparation and coating of heat-sensitive substrates. Tsis tas li ntawd, cov cua kub laser tsis yog-kev sib cuag thiab tsis yog- ua paug, thiab tuaj yeem ua rau evaporate ntau yam ntaub ntawv (xws li cov ntaub ntawv sib xyaw thiab gradient). Txawm li cas los xij, cov tshuab laser yog kim, muaj kev hloov pauv hluav taws xob tsawg, thiab nyob ntawm cov yam ntxwv ntawm lub teeb nqus ntawm cov khoom.
4. Induction cua sov qhov chaw
Induction cua sov yog ua raws li lub hauv paus ntsiab lus ntawm electromagnetic induction, tsim cov eddy tam sim no nyob rau hauv cov khoom siv txheej txheej ua rau cua sov thiab evaporation, los yog tsis ncaj qha cua sov uas tsis yog - cov ntaub ntawv conductive los ntawm ib tug rhuab crucible. Nws muaj cov cua kub zoo sib xws thiab kev tswj qhov kub thiab txias, ua rau nws tsim nyog rau cov txheej txheem txuas ntxiv hauv ntau lawm. Induction cua sov yog dawb los ntawm electrode paug thiab yooj yim los tswj, tab sis nws lub zog ceev yog qhov tsawg, feem ntau yog siv rau evaporation ntawm nruab nrab - mus rau - cov ntaub ntawv uas tsis muaj melting point.
III. Kev txiav txim siab tseem ceeb rau kev xaiv qhov cua sov
1. Txheej txheej khoom yam ntxwv
- Melting Point: Rau cov khoom siv qis melting (<1500℃), resistance heating is preferred; for high melting point materials (>2000 degree), electron beam lossis laser cua sov yuav tsum tau siv.
- Tshuaj Reactivity: Cov ntaub ntawv muaj zog heev (xws li cov hlau alkali thiab cov ntsiab lus tsis tshua muaj hauv ntiaj teb) yuav tsum tsis txhob muaj kev sib cuag ncaj qha nrog cov khoom cua sov; electron beam lossis laser cua sov (tsis yog- txoj kev sib cuag) yog nyiam.
- Purity Requirements: High - purity films yuav tsum muaj rau siab -precision optical films thiab semiconductor films; electron beam lossis laser cua sov yog pom zoo kom txo tau cov kab mob ntawm cov cua sov.
2. Cov Kev Cai Ua Yeeb Yam Zoo
- Uniformity: Rau qhov loj - thaj tsam substrate txheej, qhov sib xws ntawm qhov cua sov yog qhov tseem ceeb; induction cua sov thiab scanning electron beam cua sov muaj qhov zoo ntawm qhov no.
- Density and Adhesion: High-energy-density heat sources (electron beam, laser) result in higher kinetic energy of the evaporated particles, leading to higher film density and adhesion during deposition.
- Deposition Rate: Resistance heating offers a lower deposition rate (suitable for thin layers or slow deposition), while electron beams and lasers can achieve high-speed evaporation (>100 nm / s).
3. Txheej txheem Economics
- Cov Khoom Siv Hluav Taws Xob: Cov khoom siv cua sov tiv taus yog qhov pheej yig tshaj, thaum cov khoom siv laser thiab electron beam kim dua; qhov kev xaiv yuav tsum yog nyob ntawm qhov ntau lawm thiab pob nyiaj siv.
- Kev siv hluav taws xob thiab kev ua haujlwm: Induction cua sov thiab cov cua sov ua haujlwm muaj zog dua kev hloov dua siab tshiab (50% -70%), thaum laser cua sov tau qis dua (feem ntau <30%).
- Cov Nqi Them Kho: Cov khoom cua kub tsis kam tiv taus yog nquag hnav thiab tsim kua muag thiab yuav tsum tau hloov ntau zaus; Cov phom electron beam thiab laser taub hau muaj cov nqi kho ntau dua tab sis kev ua neej ntev dua.
Xaus
Cov qauv siv rau cov khoom evaporation muaj xws li kauv coils (tsim rau cov ntaub ntawv filamentous), nkoj - cov tais zoo li (xws li hmoov los yog cov khoom lumpy), thiab conical crucibles (tsim rau cov khoom siv organic lossis corrosive). Ntawm cov no, cov nkoj tungsten thiab cov nkoj molybdenum yog feem ntau siv. Raws li tus kws tshaj lij cov khoom lag luam uas tsis yog- ferrous hlau, FANMETAL tsis tsuas yog muab cov khoom siv evaporation customized no xwb tab sis kuj muaj ntau tshaj li ob xyoo lawm ntawm kev txawj ntse hauv kev tsim thiab xa tawm cov khoom siv hlau muaj txiaj ntsig (xws li platinum- iridium hlau, electrodes, lossis cov ntaub ntawv hom phiaj). Yog tias koj muaj lus nug txog cov khoom no cov ntsiab lus lossis cov lus nug txog tus nqi, tsis txhob yig tiv tauj peb ntawm admin@fanmetalloy.com. Peb tos ntsoov rau koj cov lus.
