Boron Nitride Siv Hauv Cov Khoom Siv Ceramics
Sep 30, 2021
Cov khoom siv Boron nitride muaj cov cua sov zoo, ruaj khov tshuaj thiab hluav taws xob rwb thaiv tsev. Nyob rau tib lub sijhawm, nws muaj cov yam ntxwv ua kom muaj cua sov zoo, cov khoom siv hluav taws xob zoo, thiab ua cov khoom yooj yim. Nws cov ntsiab lus melting yog siab li 2800 ℃. Nws yog ib qho khoom siv hluav taws xob zoo tshaj plaws thiab cov cua sov zoo heev. Cov yam ntxwv tshwj xeeb no ntawm BN cov ntaub ntawv ua ke nrog TiB2 tuaj yeem txhim kho cov khoom siv' thermal conductivity thiab tau txais qhov tsim nyog tiv taus thiab kub coefficient ntawm kev ua haujlwm.
BN cov khoom siv ua hluav taws xob cov khoom siv ua kom lub nkoj ua kom qhuav feem ntau yog siv hauv kev lag luam nqus plating. Lub tshuab nqus plating plating yog ib txoj hauv kev los hloov cov khoom siv hlau xws li txhuas, nyiaj, kub, titanium, thiab lwm yam mus rau hauv cov pa hauv qab lub tshuab nqus tsev thiab kub, thiab tom qab ntawd phaj nws mus rau hlau, iav, silicon wafer, organic pwm, ntawv thiab lwm yam khoom siv los tsim cov substrate. Hlau txheej zaj duab xis nyias txheej ntawm kaum tawm mus rau pua pua ntawm angstroms. Lub crucible lossis nkoj siv los nqa cov pa ua pa uas tau tso rau hauv qhov kub thiab txias tsis kam, tiv taus cov hlau yaig, muaj zog tiv taus cua sov, thiab kev ua kom sov yog&"nkoj evaporation &". Txij li kev qhia txog tshuab nqus plating thev naus laus zis hauv xyoo 1970, kev siv lub nkoj nqus dej tau hloov pauv los ntawm cov txheej txheem graphite crucibles ntxov tshaj plaws rau tom qab ob zaug-crucible systems nrog boron nitride linings hauv cov cua sov cov thawv, uas muaj kev txhim kho corrosion tsis zoo thiab lub neej ua haujlwm ntev. Ntev tos tsis tuaj yeem ua tiav cov txiaj ntsig zoo. Nws tsis yog txog thaum United Carbide Corporation hauv Tebchaws Meskas tau qhia txog boron nitride cov khoom siv ua cov khoom siv hluav taws xob rau hauv kev tsim cov tshuab nqus plating nqus cov nkoj, thiab maj mam txhim kho thiab txhim kho cov khoom siv thiab kev pab cuam lub neej ntawm cov nkoj nqus dej.
Ib qho ntxiv, kev sib xyaw ua ke ntawm lub siab dielectric tawg lub zog thiab lub ntim siab tiv taus ua rau h-BN cov khoom lag luam siv ua hluav taws xob insulators. Vim tias nws zoo li yuav raug oxidized ntawm qhov kub siab, nws feem ntau siv hauv lub tshuab nqus tsev thiab ua haujlwm tsis zoo. Cov tshuaj tsis muaj zog ntawm boron nitride ua rau nws dav siv hauv thermocouple tiv thaiv lub tes tsho, crucibles thiab cov hlab ntsha rov qab, tab sis kom tsis txhob oxidizing atmospheres thaum thov.
