Vim li cas thiaj xaiv Ntshiab Niobium Foil hauv Kev Lag Luam Hluav Taws Xob Hluav Taws Xob

Niobium (Nb) yog ib qho tsis tshua muaj hlau refractory nrog lub melting point siab txog 2468℃thiab lub boiling point ntawm 4740 degree. Foils ua los ntawm high-purity niobium (piv txwv li, qib Nb1, purity ntau dua los yog sib npaug rau 99.95%) nthuav tawm cov khoom zoo heev.

Ua ntej, tshwj xeeb kub-kub stability. Thaum lub sijhawm ua haujlwm, qhov kub thiab txias ntawm hluav taws xob lub teeb qhov chaw yog qhov siab heev - piv txwv li, lub arc tube chaw ntawm lub teeb ceramic hlau halide tuaj yeem ncav cuag 1300 degree, thaum lub tungsten electrode ua haujlwm ntawm li 3000 degree. Niobium tuav lub zog zoo ntawm qhov kub txog li 1200 degree, ua rau nws muaj peev xwm tiv taus qhov kub siab tshaj plaws hauv qhov chaw teeb pom kev zoo.

Thib ob, zoo heev ductility thiab processability. High-purity niobium ntawv ci muaj qhov zoo tshaj plaws ductility thiab tuaj yeem txias dov mus rau thicknesses tsawg li 0.01 hli yam tsis muaj cracking. Cov yam ntxwv ua haujlwm no tso cai rau niobium ntawv ci tsim rau hauv ntau yam duab - xws li niobium raj, lub kaus mom, thiab cov pas nrig - kom ua tau raws li cov qauv tsim ntawm cov khoom sib txawv.

Thib peb, zoo hluav taws xob thiab thermal conductivity. Niobium muaj qhov tiv taus ntawm li 15.2 μΩ·cm thiab thermal conductivity ntawm kwv yees li 53.7 W / (m·K), ua rau nws ua tau zoo heev ntawm hluav taws xob thiab cua sov. Cov cuab yeej no yog qhov tseem ceeb rau kev coj ua tam sim no thiab kev tswj xyuas thermal hauv cov khoom siv hluav taws xob.

Plaub, zoo kawg li corrosion kuj. Nyob rau hauv chav tsev kub, niobium nthuav tawm zoo heev tsis kam mus rau feem ntau inorganic acids, raws li nws tsim ib tug ntom Nb₂O₅ oxide zaj duab xis ntawm nws nto. Qhov no zoo tiv thaiv corrosion nyob rau hauv cov tshuaj ib puag ncig ntawm hluav taws xob lub teeb qhov chaw, yog li ncua lub neej ntawm cov cuab yeej.

Ntshiab niobium ntawv ci pom cov ntawv thov thoob plaws ntau yam ntawm cov khoom siv teeb pom kev zoo, los ntawm cov teeb pom kev zoo ib txwm mus rau qhov chaw teeb pom kev tshiab.

Nyob rau hauv high-pressure sodium teeb, niobium ntawv ci yog dav siv los ua cov khoom siv hluav taws xob thiab hauv cov khoom siv. Lub arc raj ntawm lub siab-siab sodium teeb yog ua los ntawm alumina ceramic, thiab cov coefficient ntawm thermal expansion ntawm metallic niobium ntais ntawv ntawm lub ceramic raj, ua kom muaj kev ruaj ntseg sealing. Niobium raj, xov hlau, pas nrig, thiab lub kaus mom feem ntau yog siv los ua cov hlau lead tawm los yog lub hau kaw. Ntxiv zirconium rau niobium zoo txhim kho oxidation tsis kam thiab lub zog, thiab niobium-zirconium alloy capillary hlab yog feem ntau siv hauv sodium teeb tsim.

Hauv ceramic hlau halide teeb, niobium plays lub luag haujlwm tseem ceeb ua cov khoom siv electrode. Cov electrode feem ntau siv cov qauv peb ntu: lub hau (arc davhlau ya nyob twg) yog ua los ntawm tungsten, tus Tsov tus tw yog niobium, thiab ntu nruab nrab yog molybdenum - nws lub ntsiab lus melting ntawm tungsten thiab niobium. Lub niobium pas nrig yog kaw nrog lub tes tsho ceramic los ntawm cov khoom siv ceramic-iav sealing, ua tiav lub foob airtight. Qhov kev tsim no siv tag nrho niobium qhov kub-kub kuj, thermal conductivity tsawg, thiab zoo sealing compatibility nrog ceramics.

Nyob rau hauv txias cathode fluorescent teeb (CCFLs), niobium yog dav siv los ua cov khoom siv electrode vim nws cov ductility zoo, muaj hluav taws xob conductivity, thiab kev ua haujlwm tsim nyog. Cov hluav taws xob ua los ntawm niobium thiab niobium alloys tuaj yeem ua rau lub teeb ua haujlwm tam sim no los ntawm kwv yees li ob npaug, thiab lawv lub neej ua haujlwm tuaj yeem tshaj 10,000 teev. Nb / Ni composite electrodes pom zoo hluav taws xob zoo piv nrog rau lwm cov khoom siv electrode.

Hauv quartz iav teeb thiab halogen teeb, niobium ntawv ci kuj yog cov khoom siv tseem ceeb, siv rau hauv cov khoom xws li cov ntawv ci hom capacitors, quartz iav teeb, thiab halogen teeb.

Hauv thaj chaw hluav taws xob hluav taws xob, txawm hais tias lwm cov hlau refractory xws li molybdenum, tungsten, thiab tantalum kuj tseem siv, cov niobium ntshiab muaj qhov tshwj xeeb zoo.

Piv nrog molybdenum, niobium muaj cov coefficient ntawm thermal expansion uas zoo dua ntais alumina ceramics, uas ua rau muaj kev ruaj ntseg dua sealing. Piv nrog rau tungsten, niobium muaj superior ductility thiab formability, tso cai rau nws mus ua ib tug nyias nyias foils. Piv nrog rau tantalum (melting point 2996 degree), niobium muaj qhov qis me ntsis melting point (2468 degree) tab sis qis dua qhov ntom (8.57 g / cm³), muab qhov hnyav zoo thaum tseem ua tau raws li qhov yuav tsum tau muaj qhov kub thiab txias - thiab ntawm tus nqi qis dua.

Qhov tseem ceeb tshaj, kev ua haujlwm qis ntawm cov ntshiab niobium muab nws zoo heev electron emission kev ua tau zoo thaum siv los ua cov khoom siv electrode. Ntxiv mus, nws superior sealing compatibility nrog ceramics thiab iav yog ib qho tseem ceeb vim li cas nws yog irreplaceable nyob rau hauv lub hluav taws xob lub teeb qhov kev lag luam.