Tantalumtechnical tsis!
Kub taw tes ntawm tantalum yog 5427 degree thiab lub melting point yog 2996 degree. Nws yog cov hlau refractory thiab nws cov ntsiab lus melting yog siab dua lwm cov hlau uas nquag siv. Tantalum pib reacts nrog oxygen ntawm 300 degree hauv huab cua, reacts nrog nitrogen ntawm 700 degree, thiab reacts nrog nitrogen ntawm 350 degree nyob rau hauv hydrogen-muaj roj.
Nws pib hnov mob nrog hydrogen thiab pib hnov mob nrog nitrogen ntawm 300 degree hauv ammonia roj, ob qho tib si yuav tsim cov nkig. Yog li, yog tias cov khoom siv tantalum thiab cov thawv ntim tau sib cuag nrog huab cua thaum lub sijhawm ua haujlwm, qhov kev ua haujlwm kub yuav tsum tsis pub tshaj 250 degree. Tsuas yog lawv tsis sib cuag nrog huab cua thiab lwm qhov chaw, lawv tuaj yeem txiav txim siab siv rau qhov kub siab dua.
Kev vuam thiab kev kho cua sov ntawm tantalum yuav tsum tau ua nyob rau hauv lub tshuab nqus tsev lossis nyob rau hauv kev tiv thaiv ntawm inert gas, uas yog, cov txheej txheem thermal saum 300 degree yuav tsum tau ua nyob rau hauv kev tiv thaiv ntawm lub tshuab nqus tsev los yog inert gas. Tantalum feem ntau yog siv rau inert gas shielded vuam. Lub purity ntawm argon yuav tsum tsis txhob tsawg tshaj li 99.999%. Tsis tsuas yog lub vuam pas dej ua ke yuav tsum tau tiv thaiv los ntawm inert gas, tab sis kuj lub weld thiab tshav kub-cuam tshuam cheeb tsam uas yog txias tom qab vuam yuav tsum tau tiv thaiv los ntawm inert roj thaum kub siab tshaj 250 degree. Yog li ntawd, yuav tsum tau ib tug tiv thaiv cab cover. Nws yog qhov tsim nyog kom tsis txhob muab cov roj inert thaum qhov kub thiab txias qis dua 200 degree. Nws yuav tsum tau xyuas kom meej tias qhov chaw ntawm lub welded sib koom ua ke thiab txhua qhov weld yog silvery dawb los yog lub teeb daj. Lub teeb xiav yuav tsum tau muab rub tawm, thiab tsis muaj xiav tsaus, tawm-dawb lossis dawb hmoov yuav tsum tshwm.
Tantalum daim hlau feem ntau yog siv los ua cov ntaub ntawv tiv thaiv corrosion. A Ta 2 O 5 zaj duab xis yog tsim rau ntawm tantalum nto, uas muaj corrosion kuj zoo. Feem ntau hais lus, qhov kev tiv thaiv corrosion ntawm tantalum yog zoo dua li ntawm titanium, zirconium, thiab niobium, thiab nws tuaj yeem suav hais tias yog cov khoom siv hluav taws xob zoo dua qub. Tantalum feem ntau muaj corrosiveness zoo nyob rau hauv muaj zog corrosive xov xwm xws li nitric acid, aqua regia, hydrochloric acid, phosphoric acid, thiab organic acids.
Txawm li cas los xij, nws tsis tuaj yeem suav hais tias tantalum tuaj yeem tiv thaiv corrosion hauv cov xov xwm corrosive, xws li fuming sulfuric acid thiab hydrogen ntawm qee qhov kub thiab txias. Fluoric acid, hydrosilic acid, fluorosilicic acid, fluoroboric acid, sodium hydroxide, potassium hydroxide, potassium nitrite, aluminium chloride, aluminium fluoride, chlorine, bromine (hauv methanol) thiab lwm yam kev daws teeb meem tau txais. Cov txiaj ntsig ntawm kev siv lossis kev sim ntawm qhov tsis zoo corrosion kuj lossis corrosiveness.
Tantalum thiab tantalum alloy siab-ua cov ntaub ntawv tuaj yeem siv lub tshuab nqus tsev arc lossis lub tshuab nqus tsev electron beam melting qib thiab qib tsim los ntawm cov hmoov metallurgy txoj kev. Txij li thaum cov khoom siv ntawm cov hmoov hlau metallurgy qee zaum tsis ruaj khov txaus, nrog cov yas qis thiab cov vuam tsis zoo, lawv feem ntau tsis siv rau hauv cov hlab ntsha siab thiab tsuas yog siv hauv cov kua dej ntawm cov tshuab ua kua.
Tantalum thiab tantalum alloys tau siv dav hauv cov hlab ntsha siab, tab sis tsis muaj cov ntsiab lus tshwj xeeb hauv cov txheej txheem siab ntawm cov hlab ntsha ntawm ntau lub teb chaws. Cov hlab ntsha siab feem ntau yog ua los ntawm cov ntshiab tantalum, uas muaj qhov zoo corrosion kuj thiab plasticity. Ta-2.5W thiab Ta-10W tantalum alloys tsuas yog siv thaum yuav tsum muaj zog dua.
Oxygen, nitrogen, hydrogen thiab carbon nyob rau hauv tantalum tuaj yeem tsim cov kev daws teeb meem interstitial hauv tantalum. Thaum cov ntsiab lus ntau tshaj qhov solubility, theem ob yuav tshwm sim, txo cov plasticity ntawm tantalum. Ntxiv tungsten rau tantalum yuav ua rau kom lub melting point ntawm tantalum thiab ua rau kom kub-kub lub zog ntawm tantalum.