Dab tsi yog cov khoom ntawm molybdenum?

Molybdenum belongs rau cov pab pawg neeg ntawm high melting point hlau (tseem hu ua refractory hlau). Cov hlau refractory yog cov hlau uas muaj cov ntsiab lus melting ntau dua platinum (1772 degree). Hauv cov hlau refractory, lub zog khi ntawm tus kheej atoms yog qhov tshwj xeeb. Cov hlau refractory kuj muaj cov ntsiab lus siab melting, tsis tshua muaj vapor siab, zoo-kub stability, thiab siab elastic modulus nyob rau hauv molybdenum-raws li cov ntaub ntawv thiab tungsten-raws li cov ntaub ntawv. Hom hlau no kuj muaj cov yam ntxwv zoo xws li cov coefficient qis ntawm thermal expansion thiab siab ceev. Molybdenum yog nyob rau hauv tib pawg li tungsten nyob rau hauv lub sij hawm lub sij hawm, uas txhais tau hais tias ob hlau muaj ib tug zoo xws li lub cev thiab tshuaj. Molybdenum thiab tungsten kuj tseem muaj cov thermal conductivity zoo heev. Qhov txawv yog tias molybdenum deforms yooj yim ntawm qhov ntsuas kub qis, ua rau nws yooj yim dua rau tshuab dua tungsten. Molybdenum muaj ntau yam sib npaug ntawm cov khoom, ua rau nws muaj tseeb tag nrho-rounder.

evaporation tus nqi ntawm refractory hlau

Vapor siab ntawm refractory hlau

Kub-dependent linear thermal expansion coefficient ntawm molybdenum thiab titanium zirconium molybdenum

Temperature-dependent thermal conductivity ntawm molybdenum thiab titanium zirconium molybdenum

Tshwj xeeb kub ntawm molybdenum thiab titanium zirconium molybdenum

Resistivity ntawm titanium, zirconium, molybdenum thiab molybdenum / recrystallized molybdenum lanthanum

Cov hlau refractory feem ntau muaj me me thermal expansion coefficients thiab ntau dua. Tib yam mus rau molybdenum. Cov khoom siv kuj muaj thermal conductivity thiab tsis tshua muaj hluav taws xob resistivity. Muaj zog ruaj khov ntawm molybdenum atoms, thiab nws cov qauv elastic siab dua li ntawm ntau cov hlau. Lub thermophysical zog ntawm molybdenum hloov nrog kub.

Kub-dependent linear thermal expansion coefficients ntawm molybdenum thiab tungsten

Tshwj xeeb kub ntawm molybdenum thiab tungsten

Kub-dependent emissivity qhov tseem ceeb rau molybdenum

 

 

 

Daim duab qhia txog qhov ntsuas kub-dependent emissivity qhov tseem ceeb ntawm molybdenum (pom liab tawg paj). Kev sim ntsuas ntawm qhov emissivity ntawm Plansee cov qauv raws li kev xa khoom tuaj yeem pom nyob rau ntawm qhov kawg ntawm cov kab tawg.

Lub resistivity ρ (rho) ntawm ib yam khoom yog qhov reciprocal ntawm nws cov hluav taws xob conductivity. Qhov siab dua tus nqi ntawm cov khoom tiv thaiv, qhov ua rau nws cov hluav taws xob conductivity tsis zoo. Resistivity ρ yog ntsuas hauv Ωmm² / m. Cov hlau sib txawv muaj qhov sib txawv. Piv txwv li: Nyiaj muaj ib tug resistivity ntawm {{0}}.016 Ωmm² / m thiab Titanium muaj ib tug resistivity ntawm 0.427 Ωmm² / m. Qhov kub thiab txias, alloying ntsiab, impurities thiab tsis xws luag ntawm txhua yam khoom yuav muaj kev cuam tshuam zoo rau cov resistivity. Peb cov ntaub ntawv ua tau zoo molybdenum thiab tungsten muaj qhov tiv taus tsawg heev: nyob ib ncig ntawm 0.05 Ωmm² / m ntawm chav tsev kub; txawm tias tsawg dua 0.5 Ωmm² / m ntawm 1500 degree. Peb cov hlau yog li ntawd zoo tagnrho rau siv los ua hluav taws xob tiv tauj thiab cov ntaub ntawv txheej. Txij li thaum molybdenum thiab tungsten muaj lub cubic lattice, cov resistivity yog tib yam nyob rau hauv tag nrho cov crystallographic qhia. Daim duab kab kos nrog 2 kab. Saib raws li cov ntaub ntawv, Daim Ntawv Qhia Daim ntawv qhia muaj 1 X axis displaying Temperature [degree]. Cov ntaub ntawv nyob ntawm 0 txog 3369.33. Daim ntawv qhia muaj 1 Y axis displaying Specific electronic resistance [(Ω⋅mm2)/m]. Cov ntaub ntawv yog los ntawm 0.0422192 txog 1.16871. Xaus ntawm daim duab sib tham sib. Resistivity ntawm Molybdenum thiab Tungsten Enlarge Chart Line chart nrog 2 kab. Saib raws li cov ntaub ntawv, Daim Ntawv Qhia Daim ntawv qhia muaj 1 X axis displaying Temperature [degree]. Cov ntaub ntawv sib txawv ntawm 25.4 txog 801. Daim ntawv qhia muaj 1 Y axis uas qhia cov thermal conductivity [W/m⋅K)]. Cov ntaub ntawv muaj nyob ntawm 116.8677848 rau 174.1113248.

Resistivity ntawm molybdenum thiab tungsten

Kub-nyob ntawm thermal conductivity ntawm molybdenum thiab tungsten

Nrog lub melting point siab li 2620 degree, molybdenum tuav nws lub zog thiab nkag mus txawm nyob rau hauv high kub. Qhov siab dua qhov kev hloov ntawm cov khoom siv, qhov ntau dua qhov kev txhim kho ntawm molybdenum lub zog. Piv nrog rau lwm cov hlau, cov ductility ntawm molybdenum cov ntaub ntawv kuj nce nrog cov degree ntawm kev sib sau. Peb ntxiv rhenium raws li cov khoom siv hlau, uas tuaj yeem tsis tsuas yog txhim kho cov ductility ntawm molybdenum, tab sis kuj txo qhov kev hloov pauv ntawm qhov kub thiab txias. Peb kuj siv titanium, zirconium, hafnium, carbon thiab tsawg lub ntiaj teb oxides li alloying cov khoom xyaw ntxiv rau molybdenum cov ntaub ntawv. Qhov no txhais tau hais tias peb tuaj yeem tsim ntau yam khoom siv nrog ntau yam kev txhais cov khoom. Piv nrog rau lwm cov hlau, molybdenum thiab nws cov alloys muaj zog khi lub zog ntawm molybdenum atoms, yog li lawv muaj lub siab elastic modulus.

Kev sib piv ntawm elastic modulus ntawm molybdenum nrog elastic modulus ntawm lwm yam refractory hlau (W, Cr, Ta thiab Nb) ntawm qhov ntsuas kub

Hom Yield Strength Values ​​rau Molybdenum thiab Titanium Zirconium Molybdenum 0.2%

Qhov tseem ceeb tensile lub zog muaj nuj nqis rau molybdenum thiab titanium zirconium molybdenum nplooj ntawv hauv kev ntxhov siab thiab / lossis cov xwm txheej recrystallized (cov ntawv tuab: 2 hli)

Kev sib piv ntawm qhov ruaj khov-state creep tus nqi ntawm molybdenum, titanium zirconium molybdenum thiab recrystallized molybdenum lanthanum nplooj ntawv ntawm 1100 degree

Kev sib piv ntawm qhov ruaj khov-state creep tus nqi ntawm molybdenum, titanium zirconium molybdenum thiab recrystallized molybdenum lanthanum nplooj ntawv ntawm 1450 degree thiab 1800 degree

 

Nqe lus piav qhia ntawm Creep Test Sample Materials:

Cov txiaj ntsig zoo ntawm lub zog ntawm 0.2% rau molybdenum, titanium zirconium molybdenum thiab molybdenum hafnium carbide rods (inch: 25 mm; kev ntxhov siab txo qhov mob)

Qhov tseem ceeb tensile lub zog rau molybdenum, titanium zirconium molybdenum thiab molybdenum hafnium carbide rods (inch: 25 mm; kev ntxhov siab-relieved mob)

Kub hardness qhov tseem ceeb ntawm molybdenum, titanium zirconium molybdenum thiab molybdenum hafnium carbide rods (inch: 25 mm; mob-relieved mob)

Optical micrograph ntawm molybdenum daim ntawv (kev ntxhov siab relieved)

Optical micrograph ntawm molybdenum ntawv (recrystallized)

Optical micrograph ntawm recrystallized molybdenum lanthanum ntawv

Brittle-ductile hloov kub:

Yog hais tias rhuab mus rau ib qho kub, molybdenum poob nws brittleness thiab ua ductile. Qhov kub xav tau los hloov brittleness rau hauv ductility yog hu ua brittle-ductile hloov kub. Kev hloov pauv ntawm qhov kub thiab txias yog cuam tshuam nrog ntau yam, nrog rau cov tshuaj muaj pes tsawg leeg thiab qib ntawm deformation ntawm cov hlau. Lub ductility ntawm molybdenum txo qis nrog nce qib ntawm recrystallization. Qhov no txhais tau hais tias qhov kub ntawm recrystallization yog qhov txiav txim siab. Cov qauv hloov nrog recrystallization kub. Qhov no grain remodeling txo lub zog thiab hardness ntawm molybdenum thiab ua rau kom muaj feem yuav tawg. Nyob ntawm cov txheej txheem tsim, kev ua haujlwm xws li dov, forging lossis kos duab yuav tsum tau rov qab ua tus qauv qub. Qhov kub ntawm recrystallization nyob ntawm qhov degree ntawm deformation ntawm molybdenum thiab nws cov tshuaj muaj pes tsawg leeg. Doping nrog me me ntawm oxide hais (xws li lanthanum oxide) tuaj yeem ua rau qhov kub thiab txias recrystallization thiab creep kuj ntawm molybdenum. Cov lus hauv qab no qhia txog qhov kub thiab txias recrystallization rau cov khoom siv molybdenum.

Feem ntau, thaum lub sij hawm tsim thiab ua ntawm molybdenum thiab refractory hlau, nws yog ib qho tsim nyog yuav tsum nkag siab tag nrho cov khoom tshwj xeeb ntawm cov ntaub ntawv no. Yog tias siv cov txheej txheem chipless xws li khoov lossis folding, cov txheej txheem no yuav tsum tau siv siab tshaj qhov hloov pauv ntawm qhov kub thiab txias kom ntseeg tau tias daim ntawv tuaj yeem ua tiav yam tsis muaj kev pheej hmoo ntawm kev tawg. Lub thicker daim ntawv, qhov siab dua qhov kub yuav tsum tau rau kev tawg-dawb txoj kev. Molybdenum kuj tseem tsim nyog rau kev txiav thiab stamping kev ua haujlwm yog tias lub cuab yeej ua kom zoo thiab qhov ntsuas kub ua ntej tau hloov kho kom raug. Kev txiav tuaj yeem ua tau zoo nrog lub tshuab muaj zog thiab muaj zog heev. Yog tias koj muaj lus nug txog kev ua cov hlau refractory, peb yuav zoo siab los siv peb cov kev paub ntau xyoo los pab.

Cov tshuaj tiv thaiv zoo heev ntawm molybdenum thiab nws cov alloys tau nyiam cov neeg siv tshuaj lom neeg thiab iav kev lag luam. Molybdenum yog corrosion-resistant ntawm atmospheric humidity qis dua 60%. Molybdenum tsuas yog pib qhia fading ntawm cov av noo ntau dua. Molybdenum tsis muaj corrosion resistant nyob rau hauv alkaline thiab oxidizing kua ntawm kub siab tshaj 100 degree. Rau cov ntawv thov uas molybdenum siv rau hauv oxidizing gases thiab cov ntsiab lus siab tshaj 250 degree, peb tsim Sibor® txheej txheej, uas tiv thaiv molybdenum los ntawm oxidation. Cov iav melts, hydrogen, nitrogen, inert gases, hlau melts thiab oxide ceramics tsis corrode molybdenum txawm nyob rau hauv kub heev, los yog corrode molybdenum tsawg tshaj li lwm yam khoom siv hlau.

Cov lus hauv qab no teev cov khoom tiv thaiv corrosion ntawm molybdenum. Tshwj tsis yog hais tias, tag nrho cov kev qhia tshwj xeeb yog rau cov kev daws teeb meem tsis muaj oxygen. Cov concentrations me me ntawm cov tshuaj lom neeg tsis huv tuaj yeem cuam tshuam qhov corrosion kuj ntawm molybdenum. Yog tias koj muaj lus nug txog kev txhim kho corrosion nyuaj, peb zoo siab los siv peb cov kev paub dhau los thiab kev kuaj corrosion hauv tsev los pab koj.

Corrosion cwj pwm ntawm molybdenum

Molybdenum Flange

Molybdenum Vacuum Plating Evaporation Nkoj

Ntshiab Molybdenum Flat Head Screws Ceev thiab Bolts

Nyem rau ntawm lub npe khoom kom paub ntau ntxiv txog cov khoom!