Qhov sib txawv tseem ceeb ntawm molybdenum thiab tungsten yog molybdenum tsis tshua muaj zog rau oxidation, whereas tungsten tiv taus ntau dua rau oxidation.
Molybdenum thiab tungsten yog pab pawg 6 cov tshuaj lom neeg uas nyob hauv d block ntawm lub sijhawm ntawm cov tshuaj lom neeg. Yog li ntawd, ob lub ntsiab lus tshuaj muaj cov khoom zoo sib xws.
Molybdenum yog dab tsi?
Molybdenum yog cov khoom siv tshuaj muaj tshuaj lom neeg lub cim Mo thiab tus lej atomic 42. Nws muaj cov xim hlau grey. Lub npe ntawm cov tshuaj no los ntawm Greek lo lus qub "molybdos" uas txhais tau tias "lead". Qhov no yog vim cov ore ntawm molybdenum tsis meej pem nrog cov hlau lead. Feem ntau, cov hlau no tsis tshwm sim raws li cov hlau dawb. Nws tshwm sim hauv ntau lub xeev oxidation hauv cov zaub mov. Nyob rau hauv nws daim ntawv dawb, nws yog ib tug silvery hlau uas muaj ib tug grey cam khwb cia, thiab nws muaj 6th siab tshaj melting point.
Daim duab 01: Molybdenum Hlau
Feem ntau cov tshuaj sib xyaw ntawm molybdenum qhia tias muaj kev solubility tsawg heev hauv dej. Tab sis thaum cov zaub mov uas muaj molybdenum tuaj rau hauv kev sib cuag nrog oxygen thiab dej, lawv tsim molybdate ions uas muaj ntau solubility hauv dej. Feem ntau, cov khoom sib txuas ntawm cov hlau no muaj txiaj ntsig zoo hauv cov ntawv thov kev kub ntxhov thiab kev siv kub kub hauv cov xim thiab cov catalysts.
Molybdenum yog cov hlau hloov pauv. Cov hlau no tsis pom pom tshwm sim nrog oxygen thiab dej ntawm chav tsev kub. Oxidation ntawm molybdenum tsis muaj zog pib ntawm qhov kub ntawm 300 degrees Celsius. Cov oxidation ntau ntawm cov hlau no tshwm sim ntawm qhov kub thiab txias. Tsis tas li ntawd, muaj 35 lub npe hu ua isotopes ntawm cov hlau no uas muaj atomic masses li ntawm 83 txog 117. Ntxiv rau qhov ntawd, muaj 4 metastable nuclear isomers. Ntawm lawv, muaj 7 isotopes uas tshwm sim ib txwm muaj.
Muaj ntau cov ntawv thov tseem ceeb ntawm molybdenum, suav nrog kev tsim cov alloys xws li hlau, thiab stainless hlau. Tsis tas li ntawd, nws muaj txiaj ntsig zoo hauv kev tsim tshuaj lom neeg, kev ua haujlwm siab ceev steel, cam khwb cia hlau ntau lawm, thiab super-alloy ntau lawm. Muaj qee qhov kev siv ntxiv, suav nrog kev siv cov hmoov molybdenum ua cov chiv rau qee hom nroj tsuag (xws li zaub paj), hauv NOx analyzers, ua anodes uas tuaj yeem hloov tungsten hauv qee qhov chaw qis hluav taws xob xoo hluav taws xob, thiab lwm yam.
Tungsten yog dab tsi?
Tungsten yog cov khoom siv tshuaj muaj lub cim W thiab atomic tooj 74. Nws yog ib pawg 6 cov tshuaj lom neeg thiab cov hlau tsis tshua muaj tshwm sim hauv lub ntiaj teb, tshwj xeeb tshaj yog ua ke nrog lwm cov khoom hauv cov tshuaj lom neeg. Cov hlau no zoo li greyish dawb, lustrous hlau. Qhov tseem ceeb tshaj plaws ntawm tungsten muaj xws li scheelite thiab wolframite.
Daim duab 02: A Tungsten Filament
Cov hlau tungsten dawb muaj qhov muaj zog zoo heev. Nws muaj qhov siab tshaj plaws melting point ntawm tag nrho cov paub cov ntsiab lus tshuaj. Cov hlau no tseem muaj qhov kub siab tshaj plaws uas paub txog txhua yam tshuaj lom neeg. Qhov ntom ntawm cov hlau no ntau dua piv nrog cov kub thiab cov tshuaj uranium. Qhov ntom ntom no ntau dua li cov hlau lead.
Tungsten yog ib qho khoom siv tawv thiab tawv uas ua rau nws nyuaj rau kev ua haujlwm nrog cov hlau no. Tsis tas li ntawd, cov hlau ntshiab yog ntau dua, thiab peb tuaj yeem yooj yim txiav nws nrog hard steel hacksaw. Qhov no tsuas yog cov hlau uas paub tias tshwm sim hauv biomolecules thaum xav txog lwm cov hlau hloov pauv hauv 3rd kev hloov pauv. Peb tuaj yeem pom cov hlau no hauv ob peb hom kab mob thiab archaea.
Muaj ntau cov ntawv thov tseem ceeb ntawm tungsten, suav nrog kev tsim cov ntaub ntawv nyuaj xws li tungsten carbide, kev tsim cov alloys thiab steels. Cov hlau no muaj qhov kub thiab txias hloov pauv, uas ua rau nws tsim los ntawm cov txheej txheem sophisticated xws li hmoov metallurgy, spark plasma sintering, tshuaj vapor deposition, kub isostatic nias, thiab lwm yam.
Qhov txawv ntawm Molybdenum thiab tungsten yog dab tsi?
Molybdenum thiab tungsten yog d thaiv kev hloov pauv hlau hauv pawg 6 ntawm lub sijhawm ntawm cov ntsiab lus. Qhov sib txawv tseem ceeb ntawm molybdenum thiab tungsten yog molybdenum tsis tshua muaj zog rau oxidation, thaum tungsten tiv taus ntau dua rau oxidation.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm molybdenum thiab tungsten hauv daim ntawv tabular.
Summary – Molybdenum vs Tungsten
Qhov sib txawv tseem ceeb ntawm molybdenum thiab tungsten yog molybdenum tsis tshua muaj zog rau oxidation, whereas tungsten tiv taus ntau dua rau oxidation.
