Cov lus qhia rau tshem tawm impurities los ntawm graphite hmoov

Graphite crucible feem ntau yog siv nyob rau hauv kev ntau lawm cov hlau thiab semiconductor cov ntaub ntawv. Txhawm rau ua cov hlau thiab cov ntaub ntawv semiconduct mus txog qee yam kev ua kom zoo thiab cov hmoov av uas yuav tsum muaj nrog cov pa roj carbon monoxide ntau thiab tsis tshua muaj kev cuam tshuam. Lub sijhawm no, nws yog ib qho tsim nyog los tshem tawm impurities los ntawm graphite hmoov thaum ua. Coob tus neeg muas zaub tsis paub yuav ua li cas nrog impurities hauv graphite hmoov. Niaj hnub no, pluite graphite editor yuav tham txog cov lus qhia rau kev tshem tawm impurities hauv kev nthuav dav:

Thaum tsim cov hmoov graphite, peb yuav tsum nruj me ntsis tswj cov ntsiab lus ntawm kev xaiv cov ntaub ntawv raw, thiab tiv thaiv kom cov khoom tsis muaj kev cuam tshuam ntawm cov txheej txheem kev ua cov hmoov av. Lub oxides ntawm ntau cov neeg impurity tau decomposed thiab evaporated ntawm qhov kub thiab txias, yog li ua kom muaj kev huv ntawm cov tsim cov khoom lag luam.

Thaum tsim cov khoom lag luam dav hlau, cov cua sov muaj kev kub ntxhov txog li 2300 ℃ thiab cov ntsiab lus tsis sib luag yog li 0.1% -0.3%. Yog hais tias lub cub hluav taws kub yog tsa rau 2500-3000 ℃, cov ntsiab lus ntawm residual impurities yuav tau txo ntau heev. Thaum tsim cov khoom lag luam graphite, roj av coke nrog cov hmoov tshauv qis yog siv los yog cov khoom siv rwb thaiv tsev.

Txawm hais tias qhov ntsuas kub yog tsuas nce rau 2800 ℃, qee qhov tsis txaus siab tseem nyuaj rau tshem tawm. Qee cov tuam txhab siv cov qauv xws li shrinking rauv tseem ceeb thiab nce ntom ntom nti los rho tawm cov zis graphite hmoov rauv thiab nce kev siv hluav taws xob. Yog li ntawd, thaum ntsuas kub ntawm graphite hmoov rauv ncav cuag 1800 ℃, fluorides thiab lwm yam collorine, yog qhia, thiab nws txuas ntxiv rau ob peb teev tom qab tsis ua hauj lwm. Qhov no yog txhawm rau tiv thaiv cov vaporized impurities los ntawm qhov sib txawv ntawm cov cua sov, thiab kom tshem tawm cov hmoov av uas tseem ceeb los ntawm kev qhia qee cov nitrogen.