Cov yam ntxwv zoo ntawm Silicon Carbide thiab Boron Nitride
Apr 29, 2024
Silicon carbide thiab boron nitride ob leeg muaj kev tiv thaiv zoo rau qhov kub thiab txias, thiab lwm yam. Koj puas xav paub qhov txawv? Thov nyeem ntxiv!
Silicon carbide (SiC) thiab boron nitride (BN) yog ob qho tseem ceeb ntawm cov khoom siv ceramic vim lawv cov khoom zoo. SiC thiab BN muaj cov yam ntxwv tshwj xeeb uas ua rau lawv muaj lub zog siab, tawv tawv, zoo thermal thiab tshuaj stability, thiab hluav taws xob conductivity. Hauv tsab xov xwm no, peb yuav tham txog cov qauv thiab cov khoom ntawm SiC thiab BN.
Silicon carbide muaj cov qauv siv lead ua uas muaj hexagonal lattice ntawm alternating txheej ntawm silicon thiab carbon atoms. Si-C daim ntawv cog lus ntev yog 188 teev tsaus ntuj, thiab siv lead ua symmetry yog 6H polytype. SiC muaj lub siab melting point (kwv yees li 2700 degree), thiab nws yog suav hais tias yog ib qho ntawm cov feem ntau robust thiab enduring ceramics. Lub hexagonal qauv ntawm SiC ua rau anisotropic mechanical zog, txhais tau hais tias nws muaj peev xwm tiv taus dabtsi yog khoov thiab compression rog nyob rau hauv ib txoj kev sib txawv nyob ntawm seb cov kev taw qhia ntawm lub zog.
Boron nitride muaj ob lub ntsiab siv lead ua, hexagonal (h-BN) thiab cubic (c-BN). Nyob rau hauv h-BN, cov boron thiab nitrogen atoms tsim ib tug interconnected hexagonal network, whereas nyob rau hauv c-BN lub BN bonds tsim ib tug cubic qauv. BN daim ntawv cog lus ntev yog 144 teev tsaus ntuj, thiab ob qho tib si h-BN thiab c-BN muaj cov thermal stability siab, ua rau lawv haum rau cov ntawv thov kub. Cov txheej txheem txheej ntawm h-BN muab nws cov khoom zoo sib xws rau graphite, xws li thermal thiab hluav taws xob conductivity hauv lub dav hlau basal. Txawm li cas los xij, tsis zoo li graphite, h-BN tiv taus oxidation thiab tuaj yeem tiv taus kub dua.
Qhov kawg tab sis tsis yog qhov tsawg tshaj plaws, ob qho tib si SiC thiab BN muaj cov yam ntxwv tshwj xeeb uas ua rau lawv muaj lub zog siab, tawv tawv, zoo thermal thiab tshuaj stability, thiab hluav taws xob conductivity. Cov khoom no ua rau lawv haum rau ntau yam kev siv, xws li cov cuab yeej txiav, cov tsho tiv thaiv mos txwv, cov khoom siv hluav taws xob kub kub, thiab cov khoom sib xyaw.
