Lwm hom ntawm Niobium
Niobium hmoov rau metallurgy
Niobium hmoov feem ntau yog npaj los ntawm hmoov metallurgy, thiab nws cov tsos yog tsaus grey. Nws yog siv los ua cov khoom siv raw thiab ua cov welding rods. Raws li cov khoom sib txawv, niobium hmoov tau muab faib ua peb qib: FNb-1, FNb-2 thiab FNb-3. FNb-1 thiab FNb-2 niobium hmoov yuav tsum dhau los ntawm 150um (100 mesh) sieve, FNb-3 niobium hmoov yuav tsum dhau los ntawm 180um (80 mesh) sieve.
Niobium Zirconium Alloy
Ib qho alloy tsim los ntawm kev ntxiv hlau zirconium rau hlau niobium. Zirconium feem ntau tshwm sim nyob rau hauv lub xeev ntawm cov tshuaj tov nyob rau hauv niobium alloy. Thaum muaj cov pa roj carbon ntau thiab cov pa roj carbon monoxide lossis cov pa roj carbon monoxide ntxiv, ib qho me me ntawm carbides thiab oxides tau tawg thiab nag los. Yog li, niobium-zirconium ua rau cov hlau muaj lub zog siab thiab ua haujlwm zoo ntawm cov yas. Zoo oxidation kuj thiab alkali hlau corrosion kuj.
Niobium pentoxide
Niobium oxide tau los ntawm cov kua-kua extraction txoj kev yog dawb los yog lub teeb daj hmoov, uas yog siv rau zus tau tej cov niobium hmoov, niobium tuav thiab ceramic capacitors. Raws li kev siv sib txawv thiab cov tshuaj muaj pes tsawg leeg, cov khoom tau muab faib ua peb qib: FNb2O5-1, FNb2O5-2, thiab FNb2O5-3.
Tantalum thiab Niobium
Nws ua rau kev txiav txim siab muab lawv ua ke thiab qhia lawv, vim tias lawv yog tib tsev neeg nyob rau hauv lub sij hawm lub sij hawm, nrog rau lub cev thiab tshuaj lom neeg zoo sib xws, thiab lawv feem ntau "inseparable". "cov kwv tij ntxaib". Qhov tseeb, thaum tib neeg xub pom niobium thiab tantalum nyob rau hauv lub xyoo pua puv 19, lawv xav tias lawv yog tib lub ntsiab. Txog plaub caug-ob xyoos tom qab, lawv tau sib cais thawj zaug los ntawm kev siv tshuaj, thiab nws tau pom tseeb tias lawv yog ob hom hlau sib txawv. Zoo li tungsten thiab molybdenum, niobium thiab tantalum yog cov hlau tsis tshua muaj melting point, thiab lawv cov khoom thiab kev siv muaj ntau yam zoo sib xws.
Txij li thaum lawv raug hu ua cov hlau tsis tshua muaj siab melting point, qhov tseem ceeb tshaj plaws ntawm niobium thiab tantalum yog cov cua sov ua haujlwm. Lawv cov ntsiab lus melting yog siab tshaj 2,400 degrees Celsius thiab ze li 3, 000 degrees Celsius feem. Tsis txhob hais tias qhov hluav taws kub zoo tib yam tsis tuaj yeem hlawv lawv, txawm tias lub hiav txwv ntawm cov nplaim taws kub hnyiab hauv qhov cub ua hlau tsis tuaj yeem pab lawv. Nws tsis yog qhov xav tsis thoob tias tantalum hlau yog cov khoom tsim nyog hauv qee qhov chaw kub thiab kub kub, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov tshuab nqus tsev cua sov ntawm ntau tshaj 1600 degrees.
Cov khoom zoo heev ntawm ib qho hlau feem ntau tuaj yeem "hloov" rau hauv lwm cov hlau. Ntxiv niobium raws li cov khoom siv alloying rau cov hlau tuaj yeem ua rau lub zog kub ntawm cov hlau thiab txhim kho kev ua haujlwm. Niobium thiab tantalum koom tes nrog ntau cov hlau xws li tungsten, molybdenum, vanadium, npib tsib xee, thiab cobalt kom tau "thermally muaj zog alloys" uas tuaj yeem siv los ua cov khoom siv rau cov dav hlau supersonic, foob pob ua ntxaij, thiab missiles. Cov kws tshawb fawb tau pib tig lawv cov xim rau niobium thiab tantalum thaum tsim cov khoom siv hluav taws xob kub tshiab; ntau qhov kub thiab txias, muaj zog alloys muaj cov khub niam txiv no koom nrog.
Niobium thiab tantalum lawv tus kheej yog tenacious heev, thiab lawv cov carbides yog ntau resistant, uas tsis txawv ntawm tungsten thiab molybdenum. Cov cemented carbide ua los ntawm niobium thiab tantalum carbide raws li cov matrix muaj zog, compression kuj, hnav tsis kam thiab corrosion kuj. Ntawm tag nrho cov tebchaw nyuaj, tantalum carbide muaj qhov nyuaj tshaj plaws. Cov cuab yeej ua los ntawm tantalum carbide carbide tuaj yeem tiv taus qhov kub thiab txias hauv qab 3800 degrees, nws qhov hardness tuaj yeem phim cov pob zeb diamond, thiab nws lub neej kev pab cuam ntev dua li ntawm tungsten carbide.