High kub kev ua tau zoo ntawmtungsten hlau
Kev ua haujlwm kub ntawm tungsten filament siv nyob rau hauv cov teeb pom kev zoo yog feem ntau ntawm 2300 thiab 2800 degree. Feem ntau, qhov ntau dua lub zog ntawm lub teeb, qhov kub thiab txias ua haujlwm ntawm cov filament ntau dua. Nws tuaj yeem pom tau tias qhov ua haujlwm kub ntawm cov filament deb tshaj qhov kub ntawm recrystallization ntawm tungsten filament. Lub sijhawm no, nyob rau hauv qhov kev txiav txim ntawm nws tus kheej qhov hnyav, ntu filament ntawm ob lub hooks yuav poob. Nyob rau hauv cov xwm txheej hnyav, lub filament yuav poob mus txog rau thaum nws tsoo nrog lub iav plhaub ntawm lub teeb.
Rau doped tungsten xov hlau uas tov nrog ib tug me me ntawm cov poov tshuaj, silicon, thiab txhuas oxides thaum lub sij hawm cov hmoov metallurgy txheej txheem ntawm tungsten, txawm hais tias cov ntsiab lus ntawm silicon thiab txhuas nyob rau hauv lub kawg tiav hlau tsuas yog ob peb feem ntawm ib lab, cov ntsiab lus ntawm poov tshuaj tsuas yog kaum ntawm ib lab, tab sis lub droop ntawm cov filament ua los ntawm no doped tungsten filament yuav ua tau zoo heev.
Yog vim li cas yog tias muaj qhov sib txawv loj hauv cov qauv siv lead ua recrystallized ntawm doped tungsten hlau thiab tsis muaj tungsten hlau. Lub recrystallized siv lead ua ntawm unoped tungsten hlau yog ib qho equiaxed siv lead ua, thaum lub recrystallized siv lead ua qauv ntawm doped tungsten hlau yog ib tug ntev strip ntawm overlapping coarse nplej.
Los ntawm qhov kev xav ntawm qhov kub thiab txias creep txoj kev xav ntawm cov ntaub ntawv hlau, cov qauv siv lead ua recrystallized ntawm cov qauv tuab thiab ntev sib tshooj tuaj yeem txhim kho nws lub peev xwm los tiv thaiv sagging ntawm qhov kub thiab txias. Raws li ib tug series ntawm kis tau tus mob electron microscopy thiab Auger zog spectrometer kev tshawb fawb thiab tsom xam ua nyob rau hauv lub 1970s, nws tau pom tias qhov tsim ntawm recrystallized siv lead ua qauv ntawm cov tuab thiab ntev lap qauv tshwj xeeb rau doped tungsten hlau yog ze ze rau cov ntsiab lus. ntawm doped tungsten hlau.
Potassium muaj feem xyuam nrog. Cov kab ntawm cov poov tshuaj ntxiv nyob rau hauv cov doped tungsten strips tsim cov kab poov tshuaj npuas sib npaug rau cov hlau axis thaum ua, uas cuam tshuam qhov kev loj hlob ntawm cov nplej thaum lub sij hawm recrystallization txheej txheem, yog li tsim ib tug tuab thiab ntev sib tshooj qauv.
Lub sagging ntawm incandescent teeb filaments tsis yog tsuas yog cuam tshuam nrog cov ntsiab lus ntawm cov ntsiab lus ntxiv thiab kev siv thev naus laus zis hauv doped tungsten filament, tab sis kuj rau kev siv thev naus laus zis thaum lub sij hawm tsim cov txheej txheem.
Lub tungsten xaim khaws cia ntau qhov kev ntxhov siab sab hauv thaum nws raug rub mus rau hauv cov hlua tiav, thiab thaum nws raug mob rau hauv cov hlua, cov kev ntxhov siab tshiab ntawm qhov tsis sib xws yog tsim nyob rau ntawm ntu ntu ntawm tungsten hlau. Cov kev ntxhov siab sab hauv no yuav tsum raug tshem tawm tag nrho ua ntej cov filament raug ntsia rau hauv lub teeb. Txwv tsis pub, lub filament yuav twist, deform, thiab sag thaum lub teeb pib ignite. Sagging ntawm cov filament yuav ua rau txo cov luminous efficiency ntawm lub teeb.
