Hexagonal Boron Nitride Applications, Ceramic BN Crucible

Hexagonal BN (h-BN) yog qhov feem ntau siv polymorph. Nws yog cov roj nplua nyeem zoo ntawm ob qho qis thiab siab kub (txog 900 ° C, txawm tias nyob hauv qhov chaw oxidizing). h-BN cov roj nplua nyeem tshwj xeeb yog muaj txiaj ntsig thaum hluav taws xob ua hluav taws xob lossis tshuaj lom neeg muaj zog ntawm graphite (lwm cov roj nplua nyeem) yuav muaj teeb meem. Lwm qhov zoo ntawm h-BN hla cov graphite yog tias nws cov roj nplua nyeem tsis xav tau dej lossis roj molecules nkaug ntawm cov khaubncaws sab nraud povtseg. Yog li ntawd, h-BN roj nplua nyeem tuaj yeem siv tau txawm tias nyob hauv lub tshuab nqus tsev, piv txwv li hauv qhov chaw thov. Lubricating cov khoom ntawm cov nplua-h-BN tau siv hauv cov tshuaj pleev ib ce, pleev xim, kho hniav kho hniav, thiab xaum xaum.

Hexagonal BN tau siv thawj zaug hauv tshuaj pleev ib ce xyoo 1940 hauv Nyij Pooj. Txawm li cas los xij, vim nws tus nqi siab, h-BN tau raug tso tseg sai sai rau daim ntawv thov no. Nws siv tau rov kho dua nyob rau xyoo 1990s nrog kev ua kom zoo h-BN cov txheej txheem tsim khoom, thiab tam sim no h-BN tau siv los ntawm yuav luag txhua tus tsim khoom lag luam ntawm cov tshuaj pleev ib ce rau lub hauv paus, pleev, qhov muag duab ntxoov ntxoo, blushers, kohl mem hluav, mem pleev di ncauj thiab lwm yam khoom tu tawv nqaij.

Vim tias nws cov cua sov zoo thiab ruaj khov, boron nitride ceramics ib txwm siv los ua ib feem ntawm cov cuab yeej siv kub. h-BN tuaj yeem suav nrog hauv cov khoom siv hlau, cov hlau phom, cov yas, cov yas, cov tshuaj txhuam hniav, thiab lwm yam khoom siv, muab lawv lub zog rau lub cev. Cov ntaub ntawv no tsim nyog rau kev tsim kho xws li cov kabmob thiab hauv kev ua hlau. Cov yas uas tau ntim nrog BN muaj tsawg dua cov thermal nthuav tawm nrog rau cov cua sov siab dua thiab hluav taws xob tiv taus. Vim nws qhov zoo heev dielectric thiab cov khoom siv cua sov, BN yog siv hauv cov khoom siv hluav taws xob piv txwv li cov khoom siv hluav taws xob rau cov khoom siv hluav taws xob, lub qhov rooj microwave-pob tshab thiab ua cov khoom siv rau cov ntsaws ruaj ruaj. Nws kuj tseem tuaj yeem siv ua dielectric hauv kev tiv thaiv kev nkag mus tsis nco.

Hexagonal BN yog siv hauv xerographic txheej txheem thiab tshuab luam ntawv laser ua tus nqi xau txheej txheej ntawm daim duab nruas. ntws. Cov phau ntawv siv qhov tshwj xeeb qhov kub thiab txias thiab cov khoom tiv thaiv h-BN.

Cov khoom tuaj yeem ua los ntawm kev nias kub los ntawm plaub qib kev lag luam ntawm h-BN. Qib HBN muaj cov tshuaj boron oxide binder; nws tuaj yeem siv tau txog 550-850 ° C hauv qhov chaw oxidizing thiab mus txog 1600 ° C hauv lub tshuab nqus tsev, tab sis vim yog cov ntsiab lus boron oxide nkag siab dej. Qib HBR siv cov tshuaj calcium borate thiab tuaj yeem siv tau ntawm 1600 ° C. Qib HBC thiab HBT tsis muaj phau ntawv tuav thiab tuaj yeem siv tau txog 3000 ° C.

Boron nitride nanosheets (h-BN) tuaj yeem tso los ntawm catalytic decomposition ntawm borazine ntawm qhov kub ~ 1100 ° C hauv kev tsim cov tshuaj ua pa ua pa, hla thaj tsam txog li 10 cm2. Ua rau lawv cov qauv hexagonal atomic, lub lattice me me tsis sib xws nrog graphene (~ 2%), thiab siab sib xws lawv tau siv los ua cov txheej txheem rau graphene-based devices.BN nanosheets kuj tseem yog cov neeg ua haujlwm zoo proton. Lawv tus nqi thauj khoom proton siab, ua ke nrog cov hluav taws xob tiv taus siab, tuaj yeem ua rau siv rau hauv cov roj hluav taws xob thiab cov dej siv hluav taws xob.

h-BN tau siv txij li ib nrab xyoo 2000s raws li lub mos txwv thiab cov roj nplua nyeem hauv cov phiaj siv phom ntev raws li lwm txoj hauv kev rau molybdenum disulfide txheej, feem ntau hu ua&"moly &". Nws tau lees tias txhawm rau txhim kho lub neej muaj txiaj ntsig zoo, nce ntu nruab nrab ntawm kev ntxuav tu, thiab txo qis qhov sib txawv ntawm qhov cuam tshuam ntawm kev nqus thawj zaug txhaj tshuaj thiab txhaj tshuaj tom ntej.