Niobium Carbide
Lus Askiv Alias: Niobium carbide (NbC); methane - niobium (1: 1); methylidyneniobium
Cov mis mos molecular: NbC
Molecular Luj: 104.923
Niobium carbide yog ib tug ntsuab cubic siv lead ua nrog ib tug metallic lustre, ntawm lub sodium chloride cubic siv lead ua system.
txheeb ze ntom ntom 8.47,
lattice tas li a =0.447nm,
Melting point 3500 degree.
Microhardness >23.5 Gpa (>2400 kg / mm2), nyuaj tshaj corundum. Modulus ntawm elasticity 338,000 N/mm2, coefficient ntawm thermal expansion 6.65 x 10^(-6)/K, thermal conductivity 14 w/(mK), tshav kub ntawm tiam -140. 7 kJ / mol, tshwj xeeb kub muaj peev xwm 36.8 J / (mol-K), resistivity 35 μΩ-cm.
Insoluble nyob rau hauv txias thiab kub hydrochloric acid, sulfuric acid thiab nitric acid, soluble nyob rau hauv kub sib tov daws ntawm hydrofluoric acid thiab nitric acid. Nyob ruaj khov ntawm 1000-1100 degree, siab tshaj 1100 degree nws oxidises sai heev rau niobium pentoxide. Niobium carbide yog yooj yim fused nyob rau hauv cov tebchaw xws li titanium carbide, zirconium carbide thiab tungsten carbide thiab ua ke lawv tsim ib homogeneous khoom tov sib tov.
Qhov ceev: 7.6 g / cm³ (25 degree)
Txoj kev npaj
Feem ntau, niobium pentoxide thiab carbon dub yog siv los ua raw khoom. Niobium pentoxide thiab carbon dub yog sib xyaw rau hauv ib qho kev faib ua feem ntawm graphite crucible thiab rhuab mus rau 1600-1800 degree nyob rau hauv ib tug high-frequency hluav taws xob rauv nyob rau hauv hydrogen los yog nqus tsev vacuum rau thawj carbonization, ces carbon dub yog ntxiv kom nws tag nrho tov thiab rhuab mus rau 1800-1900 degree nyob rau hauv hydrogen los yog lub tshuab nqus tsev rau theem nrab carbonization, ua rau Ni carbide. Los yog niobium hlau thiab carbon dub raws li raw khoom, cov hlau niobium hmoov thiab carbon dub nyob rau hauv kev faib ua feem rau cov match, tag nrho tov, rhuab nyob rau hauv lub tshuab nqus tsev los yog hydrogen mus rau 1600 ~ 1700 degree, thiaj li hais tias cov direct carbonization ntawm niobium carbide yog tsim. Nws tseem tuaj yeem siv cov txheej txheem roj-theem cov tshuaj tiv thaiv, piv txwv li kev sib xyaw ntawm niobium pentachloride vapour, hydrogen thiab methane ua raw khoom, qhov sib xyaw ntawm niobium pentachloride vapor thiab hydrogen tau dhau los ntawm tungsten hlau uas tau mus txog qhov kub ntawm 1000 degree. los yog ntau tshaj, tsim ib txheej ntawm hlau niobium rau saum npoo ntawm tungsten hlau, txuas ntxiv mus rau qhov kub thiab txias mus rau 1300 degree, tom qab ntawd dhau los ntawm kev sib xyaw ntawm methane thiab hydrogen, ua rau niobium carbonise rau hauv niobium carbide uas tso rau saum npoo. ntawm kub tungsten hlau, piv txwv li cov khoom.
Siv
Raws li ib qho ntxiv rau carbide carbide, nws yog ib feem ntawm ternary thiab quaternary carbide solid solutions, xws li WC-NbC-C ternary system. Kuj tseem siv los ua cov pob zeb dag dag dag.
Cov impurities | Tsis muaj. | |
NC -1 | NC -2 | |
CT | Ntau dua lossis sib npaug rau 11.0 | Ntau dua lossis sib npaug rau 10.0 |
CF | Tsawg dua los yog sib npaug rau 0.1 | Tsawg dua lossis sib npaug rau 0.3 |
Ta | Tsawg dua lossis sib npaug rau 0.5 | Tsawg dua lossis sib npaug rau 0.25 |
Fe | Tsawg dua los yog sib npaug rau 0.1 | Tsawg dua los yog sib npaug rau 0.1 |
Si | Tsawg dua lossis sib npaug rau 0.04 | Tsawg dua lossis sib npaug rau 0.05 |
Al | Tsawg dua lossis sib npaug rau 0.02 | Tsawg dua lossis sib npaug rau 0.02 |
Ti | -- | Tsawg dua lossis sib npaug rau 0.01 |
N | Tsawg dua lossis sib npaug rau 0.001 | Tsawg dua lossis sib npaug rau 0.01 |
Mo | -- | Tsawg dua lossis sib npaug rau 0.01 |
O | Tsawg dua lossis sib npaug rau 0.02 | Tsawg dua lossis sib npaug rau 0.03 |
Cu | Tsawg dua lossis sib npaug rau 0.01 | Tsawg dua lossis sib npaug rau 0.01 |
W | -- | Tsawg dua lossis sib npaug rau 0.01 |
Zr | -- | Tsawg dua lossis sib npaug rau 0.01 |
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