Tungsten vs Tungsten Carbide
Tungsten yog ib yam khoom thiab tungsten carbide yog ib qho inorganic compound ua los ntawm nws.
Tungsten
Tungsten, uas yog pom los ntawm lub cim W, yog ib qho kev hloov pauv hlau nrog tus lej atomic 74. Nws yog xim dawb xim xim. Nws belongs rau pawg rau thiab lub sij hawm 6 nyob rau hauv lub periodic table. Qhov hnyav molecular ntawm tungsten yog 183.84 g / mol. Kev teeb tsa hluav taws xob ntawm tungsten yog [Xe] 4f14 5d4 6s2 tungsten qhia oxidation xeev los ntawm -2 txog +6, tab sis feem ntau oxidation xeev yog +6. Tungsten tiv thaiv cov tshuaj tiv thaiv ntawm oxygen, acids thiab alkalis thaum nws nyob rau hauv ntau npaum li cas. Scheelite thiab wolframite yog hom tseem ceeb tshaj plaws ntawm tungsten minerals. Tungsten mines yog nyob rau hauv Suav teb. Lwm yam tshaj li qhov mine no muaj qee lub tebchaws xws li Russia, Austria, Bolivia, Peru thiab Portugal. Tungsten yog nrov dua rau lawv siv raws li lub teeb filaments. Cov ntsiab lus melting siab heev (3410 ° C) ntawm tungsten tau tso cai rau nws siv hauv qhov muag teev. Qhov tseeb, nws muaj qhov siab tshaj plaws melting point ntawm tag nrho cov ntsiab lus. Nws cov ntsiab lus kub kub kuj yog siab heev piv rau feem ntau lwm cov ntsiab lus. Nws yog hais txog 5660 ° C. Tungsten kuj tseem siv rau hauv kev sib cuag hluav taws xob thiab arc-welding electrodes.
Tungsten carbide
Tungsten carbide yog ib qho sib xyaw nrog cov mis WC. Cov qauv no qhia tau hais tias tungsten thiab carbon yog sib npaug, hauv qhov sib xyaw. Nws cov molar loj yog 195.86 g·mol−1 Tungsten carbide muaj xim grey-dub tsos, thiab nws yog ib qho khoom. Qhov no compound muaj ib tug melting point ntawm 2,870 ° C, thiab nws yog ib tug ntawm cov hardest carbides. Hauv Moh's scale, nws muaj tus nqi hardness txog 8.5-9 uas yog tus nqi siab heev. Ib txoj hauv kev tsim cov tungsten carbide yog reacting tungsten nrog carbon ntawm qhov kub thiab txias (1400-2000 ° C). Nws tseem tuaj yeem ua ke los ntawm cov txheej txheem patented fluid txaj, tshuaj vapor deposition txoj kev thiab ntau lwm txoj kev. Muaj ob hom tungsten carbide raws li lawv cov qauv kev teeb tsa. Ib hom yog daim ntawv hexagonal, thiab lwm yam yog daim ntawv cubic. Cov no yog hu ua alpha thiab beta compounds feem. Nyob rau hauv lub hexagonal kaw packed qauv, ob qho tib si carbon thiab tungsten muaj kev sib koom tes 6. Muaj, tungsten atom txheej pw ncaj nraim rau ib leeg qhov twg carbon atoms puv ib nrab ntawm interstices. WC yog ib qho hluav taws xob zoo thiab thermal conductor. Hais txog conductivity nws ntog nyob rau hauv tib yam li cov cuab yeej steel thiab carbon steel. Nws tiv taus cua sov thiab oxidation ntawm qhov kub thiab txias heev. Vim hais tias nws yog hnav resistant WC nws siv los ua cutters rau cov cav tov, riam rau xyaum, saws, milling cov cuab yeej, uas yog siv rau hlau ua hauj lwm, ntoo ua hauj lwm, mining thiab kev tsim kho. Qhov no kuj yog siv los ua cov hniav nyiaj hniav kub. Cov khoom siv hardness, durability, khawb tsis kam ua rau nws ua cov khoom siv zoo nkauj. Nws kuj tseem siv tau los ua cov khoom siv los txhim kho cov tshuaj tiv thaiv.
Qhov txawv ntawm tungsten thiab tungsten carbide yog dab tsi?
• Tungsten carbide yog ib qho inorganic compound ua los ntawm cov khoom ntshiab, tungsten.
• Tungsten denoted as W thiab tungsten carbide denoted as WC.
• tungsten carbide nyuaj dua tungsten.
• Tungsten carbide yog qhov ruaj thiab tiv taus ntau dua li tungsten.
