lub siab melting taw tes molybdenum tus pin rau steel melting
Ntau lub ntsiab lus paub txog lawv cov ntsiab lus melting siab, uas ua rau lawv muaj txiaj ntsig rau ntau yam kev lag luam, kev tshawb fawb, thiab kev siv thev naus laus zis. Qee cov ntsiab lus uas muaj cov ntsiab lus melting siab heev suav nrog:
1. Tungsten: Tungsten muaj qhov siab tshaj plaws melting point ntawm tag nrho cov hlau, kwv yees li 3,422 degrees Celsius (6,192 degrees Fahrenheit). Qhov tshwj xeeb melting point no ua rau tungsten muaj nuj nqis heev hauv cov ntawv thov kub xws li kev lag luam aerospace, hluav taws xob tiv tauj thiab kub kub.
2. Rhenium: Rhenium muaj qhov thib peb siab tshaj plaws melting point ntawm tag nrho cov ntsiab lus, txog 3,180 degrees Celsius (5,756 degrees Fahrenheit). Rhenium lub siab melting point thiab tsis kam hnav thiab corrosion tso cai rau nws siv nyob rau hauv high-temperature daim ntaub ntawv, nrog rau superalloys rau aerospace thiab industrial gas turbine engines.
3. Osmium: Osmium muaj qhov melting point ntawm kwv yees li 3,033 degrees Celsius (5,491 degrees Fahrenheit), ua rau nws yog ib qho ntawm cov ntsiab lus uas muaj melting point heev. Osmium yog siv nyob rau hauv ib co high-temperature alloys thiab nyob rau hauv tshwj xeeb daim ntaub ntawv uas yuav tsum tau heev hardness thiab corrosion kuj.
4. Tantalum: Tantalum muaj lub siab melting point ntawm kwv yees li 3,020 degrees Celsius (5,468 degrees Fahrenheit). Tantalum lub siab melting point thiab zoo heev corrosion kuj ua rau nws muaj txiaj ntsig hauv cov khoom siv tshuaj, cov khoom siv hluav taws xob kub kub, thiab cov khoom siv hluav taws xob.
5. Molybdenum: Molybdenum muaj lub siab melting point, kwv yees li 2,623 degrees Celsius (4,753 degrees Fahrenheit). Molybdenum lub siab melting point thiab nws cov thermal conductivity zoo heev thiab lub zog ntawm qhov kub thiab txias ua rau nws muaj txiaj ntsig rau ntau yam kev siv kub, nrog rau kev siv dav hlau, kev tiv thaiv thiab kev lag luam.
Cov ntsiab lus no muaj nuj nqis rau lawv cov ntsiab lus melting siab, uas tso cai rau lawv kom muaj kev ncaj ncees thiab kev ua tau zoo hauv qhov kub thiab txias. Lawv cov khoom tshwj xeeb ua rau lawv tseem ceeb heev rau cov ntawv thov uas cov khoom raug kub kub thiab thermal stress.
Lub melting point ntawm ib yam khoom yog cuam tshuam los ntawm ntau yam, nrog rau cov intermolecular rog, molecular qauv, thiab sab nraud siab. Nov yog qee yam tseem ceeb uas cuam tshuam qhov melting point ntawm ib yam khoom:
1. Intermolecular force: Lub zog ntawm intermolecular quab yuam ntawm molecules muaj kev cuam tshuam zoo rau lub melting point. Cov khoom uas muaj zog intermolecular rog, xws li ionic lossis covalent bonds, feem ntau muaj cov ntsiab lus melting ntau dua. Piv txwv li, cov hlau thiab ionic tebchaw zoo li muaj cov ntsiab lus melting siab vim yog lub zog ntawm lawv cov khoom sib txuas.
2. Molecular loj thiab cov duab: Qhov loj thiab cov duab ntawm lub molecule cuam tshuam rau lub melting point. Cov molecules loj dua nrog cov txheej txheem ntau dua feem ntau muaj cov ntsiab lus melting ntau dua vim qhov chaw saum npoo av nce ntxiv thiab muaj zog ntawm kev sib cuam tshuam. Hloov pauv, me me, ntau lub voj voog molecules tuaj yeem muaj cov ntsiab lus qis dua.
3. Polarity: Polar molecules muaj qhov sib npaug ntawm cov nqi xa tawm thiab zoo li muaj cov ntsiab lus melting ntau dua li cov tsis muaj polar molecules. Qhov no yog vim cov polar molecules nthuav tawm muaj zog intermolecular attractions, xws li kev sib cuam tshuam ntawm dipole-dipole thiab hydrogen bonding.
4. Cov qauv siv lead ua: Qhov kev npaj ntawm cov khoom hauv cov khoom siv lead ua lattice cuam tshuam rau qhov melting point. Cov khoom uas muaj kev txiav txim zoo thiab ntim cov khoom siv lead ua zoo sib xws feem ntau muaj cov ntsiab lus melting ntau dua li cov uas tsis muaj cov qauv tsim.
5. Siab: Qee zaum, lub melting point ntawm ib yam khoom raug cuam tshuam los ntawm sab nraud siab. Piv txwv li, nce siab tuaj yeem ua rau cov ntsiab lus melting ntawm qee yam khoom, tshwj xeeb tshaj yog cov uas pom cov cwj pwm txawv txawv thaum muaj kev kub ntxhov.
6. impurities: Lub xub ntiag ntawm impurities hauv ib yam khoom txo nws cov ntsiab lus melting. Cov impurities cuam tshuam cov qauv lattice li niaj zaus, ua kom yooj yim rau cov khoom hloov pauv ntawm cov khoom mus rau cov kua.
7. Isotope muaj pes tsawg leeg: Isotope muaj pes tsawg leeg, tshwj xeeb tshaj yog cov isotopic muaj pes tsawg leeg ntawm cov ntsiab lus, tuaj yeem cuam tshuam cov ntsiab lus melting. Isotopes nrog ntau atomic masses tuaj yeem pom cov ntsiab lus sib txawv me ntsis vim lawv qhov sib txawv atomic sib cuam tshuam.
Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb rau kev kwv yees thiab piav qhia tus cwj pwm melting ntawm cov khoom sib txawv. Los ntawm kev xav txog kev sib cuam tshuam ntawm cov xwm txheej no, cov kws tshawb fawb thiab cov kws tsim qauv tuaj yeem nkag siab txog lub cev ntawm cov khoom siv thiab lawv coj li cas nyob rau hauv cov xwm txheej sib txawv.
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