Niobium thiab tantalum feem ntau nrog rau ib leeg, tab sis cov ntsiab lus ntawm niobium nyob rau hauv lub ntiaj teb crust yog hais txog 2.4 × 10 -3%, 10 npaug ntawm tantalum, feem ntau nyob rau hauv daim ntawv ntawm columbite. Qhov dav dav corrosion kuj ntawm niobium yog siab dua li ntawm titanium thiab zirconium thiab qis dua li ntawm tantalum, thiab txij li tus nqi ntawm niobium qis dua li ntawm tantalum, niobium tuaj yeem siv los hloov cov tantalum kim dua hauv qee yam corrosive. xov xwm. Nyob rau tib lub sijhawm, qhov txheeb ze ntawm niobium tsuas yog kwv yees li 1/2 ntawm tantalum, thiab nyob rau hauv cov ntaub ntawv ntawm cov khoom loj tib yam, tus nqi ntawm niobium tsuas yog kwv yees li 1/2 ntawm tantalum, uas tuaj yeem txo cov nqi. .
Niobium thiab tantalum, yog tsim los ntawm saum npoo ntawm cov yeeb yaj kiab dension oxide thiab dhau los ua niobium corrosion tsis kam ntawm qee qhov thiab tantalum ze. Niobium feem ntau yog siv nyob rau hauv qee qhov kub tsis siab txo cov kua qaub nruab nrab, tab sis nyob rau hauv hydrofluoric acid, kub concentrated sulfuric acid, sodium hydroxide, poov tshuaj hydroxide thiab lwm yam xov xwm tsis yog corrosion resistant, nyob rau hauv lub kub concentrated hydrochloric acid thiab kub concentrated phosphoric acid nyob rau hauv cov ntaub ntawv no. tus nqi corrosion kuj tseem siab hauv cov xov xwm no yuav tsum tau ceev faj thaum thov niobium.
Kub taw tes ntawm niobium yog 4927 degree, melting point yog: 2468 degree, belongs rau refractory hlau. Niobium tuaj yeem molded ntawm qhov kub nruab nrab ntawm 350 ~ 400 degree, ntawm qhov kub ntawm 950 ~ 1000 degree, thiab tuaj yeem ua tiav tag nrho ntawm 1200 degree. Niobium tuaj yeem tsim hauv huab cua los ntawm 230 ~ 400 degree ntawm qhov kub ntawm 950 ~ 1000 degree. Niobium oxidizes hauv huab cua los ntawm 230 degree, thiab tom qab ntawd ua kom oxidizes ntawm 300 degree, thiab thaum kub siab tshaj 400 degree, cov oxide zaj duab xis tawg thiab ntog tawm, ua kom cov oxidation ceev heev. Nitriding ntawm niobium pib ntawm 600 degree hauv huab cua. Niobium nyob rau hauv hydrogen-muaj xov xwm, 250 degree ~ 950 degree yuav nqus hydrogen. Yog li ntawd, vuam thiab kev kho cua sov ntawm niobium yuav tsum tau nqa tawm nyob rau hauv lub tshuab nqus tsev los yog nyob rau hauv inert gas tiv thaiv, piv txwv li thermal txheej txheem saum toj no 300 degree yuav tsum tau nqa tawm nyob rau hauv lub nqus tsev vacuum los yog nyob rau hauv kev tiv thaiv ntawm inert gas los yog kub kub xim. Thaum cov khoom siv niobium thiab cov ntim tau raug rau cov huab cua, qhov kev thov kub yuav tsum tsis txhob ntau tshaj 230 degree, thiab qhov kub tsuas tuaj yeem nce qhov tsim nyog yog tias nws tau lees paub tias lawv tsis raug rau huab cua. Niobium yuav tsum muaj kev tiv thaiv thaum vuam los ntawm high-purity inert gases zoo ib yam li tantalum thiab yuav tsum tau muab tso rau hauv inert roj tiv thaiv ntawm kub siab tshaj 230 degree. Nws yog advisable siv inert gases thaum lub niobium weldments tau txias mus rau qhov tsawg kawg nkaus. Nws raug nquahu kom txias cov niobium weldments rau 200 degree ua ntej tso tseg cov pa roj inert.
Niobium tau siv rau hauv cov hlab ntsha siab, tab sis tsis muaj cov txheej txheem niobium hlab ntsha. Ntshiab niobium feem ntau yog siv hauv cov hlab ntsha siab, thiab qhov sib ntxiv ntawm li 1% zirconium txhim kho lub zog, tab sis corrosion kuj thiab plasticity yog me ntsis txo.
