Kev siv ntawm tungsten hlau
Apr 12, 2026| Ib cag los ntawm ib qho me me uas siv los ua cov khoom siv cua sov hauv siab - qhov kub thiab txias, cov khoom siv hluav taws xob sib hloov hauv cov raj hluav taws xob, thiab cov hlua txuas ntxiv hauv cov ntaub ntawv sib xyaw, tungsten filaments feem ntau yog siv los tsim cov filaments rau ntau yam incandescent thiab halogen tungsten teeb, nrog rau cov electrodes rau roj tawm teeb. Rau tungsten filaments lossis rods siv los ua cathodes hauv cov roj tso tawm teeb, 0.5-3% thorium ntxiv los txo nws cov electron ua haujlwm, ua rau tungsten-thorium filaments. Txij li cov thorium yog cov khoom siv hluav taws xob thiab ua rau ib puag ncig, cerium yog qee zaum siv los ua tungsten-cerium filaments lossis rods. Txawm li cas los xij, cerium muaj tus nqi evaporation siab, yog li tungsten-cerium filaments lossis rods tsuas yog siv tau rau hauv cov roj teeb qis qis xwb.
Thaum tungsten filaments recrystallize tom qab siab - siv kub, lawv ua nkig heev thiab yooj yim tawg nyob rau hauv kev cuam tshuam los yog kev co. Hauv qee qhov siab -kev ntseeg siab ntawm cov khoom siv hluav taws xob teeb pom kev zoo, txhawm rau tiv thaiv kev tawg, 3-5% rhenium feem ntau ntxiv rau doped tungsten filament, ua rau tungsten-rhenium filaments. Qhov no txo qis cov khoom siv hluav taws xob- hloov pauv qhov kub ntawm tungsten mus rau chav tsev kub lossis qis dua. Qhov no yog ib qho tshwj xeeb rhenium nyhuv, thiab txog tam sim no tsis muaj cov ntsiab lus tau pom tias tuaj yeem hloov rhenium los tsim cov nyhuv tib yam hauv tungsten.