Ntshiab txhais tau tias tsis txhob sib tov lwm yam los yog huv si, tsis muaj av, plua plav thiab kab mob, los yog tej yam teeb meem.
Pure tungsten yog cov khoom siv los ua cov khoom siv ntshiab tungsten. Lub purity ntawm ntshiab tungsten yog ntau tshaj 99.95 feem pua. Cov khoom siv tungsten ntshiab muaj qhov ceev tshaj plaws ntawm cov khoom siv tungsten, suav nrog tungsten alloy thiab cemented carbide khoom. Cov khoom siv tungsten ntshiab yog nyiam los ntawm cov neeg siv khoom rau lawv qhov siab ceev, kub tsis kam, siab corrosion kuj, siab hnav tsis kam, siab hardness thiab qis thermal expansion.
Tungsten / T ʌŋ st ə N /, tseem hu ua tungsten / W ʊ lfr ə m / (wuul-fr ə m), yog cov khoom siv tshuaj nrog cov cim tshuaj W thiab atomic tooj 74.
Dab tsi yog tungsten ntshiab?
Ntshiab tungsten yog nyob rau hauv lub xeev ntawm nyuaj thiab tsis tshua muaj hlau ntsiab nyob rau hauv tus qauv tej yam kev mob. Thaum tungsten muaj nyob rau hauv lub ntiaj teb, nws tsuas yog nyob rau hauv tshuaj compounds. Nws tau raug txheeb xyuas tias yog cov khoom tshiab hauv xyoo 1781, thiab thawj cov hlau tau sib cais hauv 1783. Nws cov ntxhia tseem ceeb yog tungsten thiab scheelite. Lub ntsiab dawb yog qhov tseem ceeb rau nws txoj kev ruaj khov. Hauv particular, nws muaj qhov siab tshaj plaws melting point ntawm tag nrho cov unalloyed hlau thiab qhov thib ob siab tshaj melting point ntawm tag nrho cov ntsiab tom qab carbon. Qhov tseem ceeb sib npaug yog nws cov dej siab dua 19.3 npaug, piv rau uranium thiab kub, thiab siab dua (kwv yees li 1.7 npaug) ntau dua cov hlau lead. Tungsten nrog me me ntawm impurities feem ntau yog nkig thiab tawv, yog li nws nyuaj rau kev ua haujlwm. Nws yog ib qho nyuaj rau txiav steel nrog steel saw, txawm tias nws yog tawv.
Daim ntawv dawb huv yog siv rau kev siv hluav taws xob. Ntau cov alloys ntawm tungsten muaj ntau daim ntawv thov, tshwj xeeb tshaj yog nyob rau hauv cov teeb pom kev zoo, (raws li filaments thiab lub hom phiaj), X-ray raj thiab superalloys. Tungsten lub siab hardness thiab ntom muab nws cov tub rog siv nyob rau hauv penetrators. tungsten tebchaw yog cov catalysts feem ntau siv hauv kev lag luam.
Ntshiab tungsten yog tib cov hlau los ntawm qhov kev hloov pauv thib peb yog paub tias tshwm sim hauv bimolecules, ntau hom kab mob hauv kev siv. Nws yog qhov hnyav tshaj plaws uas paub tias siv los ntawm txhua yam kabmob muaj sia. Txawm li cas los xij, tungsten cuam tshuam nrog molybdenum thiab tooj liab metabolism thiab yog lub neej ntawm qee cov tsiaj txhu.
Cov khoom siv tungsten ntshiab muaj xws li tungsten electrode, tungsten hlau, tungsten tiv tauj, tungsten rhaub, tungsten hlau, tungsten crucible thiab lwm yam.
