Hexagonal Boron Nitride Phaj

Hexagonal Boron Nitride (h-BN) yog ib qho khoom siv tshwj xeeb uas qhia cov qauv zoo sib xws rau graphene tab sis yog tsim los ntawm boron thiab nitrogen atoms. Nws yog feem ntau hu ua "dawb graphene" vim nws cov dawb, powdery tsos. h-BN muaj cov qauv hexagonal lattice, zoo ib yam li graphite, thiab nthuav tawm cov thermal, tshuaj, thiab hluav taws xob zoo heev.

Ib hom ntawv ntawm h-BN yog nyob rau hauv cov phaj lossis cov ntawv zoo li cov qauv. Cov phiaj no yog tsim los ntawm cov txheej txheem hexagonally boron thiab nitrogen atoms. Cov phaj no muaj ntau yam tseem ceeb thiab kev siv.

Cov khoom ntawm Hexagonal Boron Nitride

Hluav taws xob rwb thaiv tsev

Tsis zoo li graphene, uas yog ib qho zoo heev conductor ntawm hluav taws xob, h-BN yog ib qho hluav taws xob insulator. h-BN muaj qhov sib txawv ntawm qhov dav, uas yog lub zog sib txawv ntawm lub zog siab tshaj plaws hauv lub xeev (valence band) thiab lub xeev qis tshaj plaws uas tsis muaj zog (conduction band). Qhov sib txawv band no tiv thaiv qhov ntws ntawm electrons, ua rau h-BN tsis yog cov khoom siv hluav taws xob lossis cov khoom siv insulating. Cov cuab yeej no muaj txiaj ntsig hauv cov ntawv thov uas muaj hluav taws xob rwb thaiv tsev ua ke nrog lwm cov khoom siv uas xav tau.

Cov cuab yeej kub kub

Hexagonal boron nitride (h-BN) muaj cov khoom kub zoo heev, uas ua rau nws muaj txiaj ntsig hauv ntau daim ntawv thov uas cuam tshuam rau huab cua kub. Nov yog qee qhov tseem ceeb ntawm qhov kub thiab txias ntawm h-BN:

1. Thermal stability

h-BN tseem nyob ruaj khov ntawm qhov kub siab heev. Nws tuaj yeem tiv taus qhov kub thiab txias tshaj li ntawm 2000 degrees Celsius nyob rau hauv inert atmospheres yam tsis muaj kev puas tsuaj loj lossis kev hloov pauv.

2. Thermal conductivity

h-BN nthuav tawm cov thermal conductivity siab, tshwj xeeb tshaj yog nyob rau hauv lub dav hlau basal (sib npaug rau cov khaubncaws sab nraud povtseg). Cov cuab yeej no tso cai rau nws ua kom muaj txiaj ntsig zoo thiab ua kom cov cua sov, ua rau nws muaj txiaj ntsig hauv cov ntawv thov uas muaj kev tswj hwm kub yog qhov tseem ceeb, xws li hauv cov khoom siv hluav taws xob thiab cov khoom siv hauv aerospace.

3. Cov rwb thaiv tsev kub

Thaum h-BN yog ib qho zoo heev thermal conductor, nws kuj yog ib qho hluav taws xob insulator. Qhov khoom siv dual no muaj txiaj ntsig zoo hauv cov ntawv thov uas ob qho tib si hluav taws xob rwb thaiv tsev thiab kev ua kom muaj cua sov kom zoo yog xav tau ntawm qhov kub thiab txias.

4. Thermal Expansion Coefficient

Lub coefficient ntawm thermal expansion (CTE) ntawm h-BN yog qhov tsawg. Qhov no txhais tau hais tias nws muaj kev hloov pauv me me nrog qhov hloov pauv kub. Cov cuab yeej no yog qhov tseem ceeb hauv kev siv qhov kev ruaj ntseg ntawm qhov loj thiab cov duab hauv qab thermal stress yog qhov tseem ceeb.

5. High Melting Point

Lub melting point ntawm h-BN yog tshwj xeeb tshaj yog siab, nyob ib ncig ntawm 3000 degrees Celsius. Cov cuab yeej no tso cai rau h-BN los tswj nws cov qauv kev ncaj ncees txawm tias nyob rau hauv qhov chaw kub heev.

6. Molten Hlau Compatibility

h-BN nthuav tawm cov khoom tsis ntub dej thaum sib cuag nrog cov hlau molten. Qhov no txhais tau tias nws tsis nkag siab los yog khi nrog cov hlau molten. Raws li qhov tshwm sim, h-BN yog siv los ua cov khoom siv hluav taws xob rau cov ntawv thov kub kub uas cuam tshuam nrog kev ua hlau.

Tshuaj Stability

h-BN yog cov tshuaj lom neeg ruaj khov, uas ua rau nws tiv taus ntau cov tshuaj corrosive. Cov cuab yeej no tseem ceeb hauv cov ntawv thov uas cov ntaub ntawv xav tau los tiv thaiv ib puag ncig hnyav.

- Tsis muaj zog

h-BN feem ntau tsis ua haujlwm nrog cov tshuaj feem ntau, suav nrog cov kua qaub, cov hauv paus, thiab cov kuab tshuaj. Qhov no inertness ua rau nws resistant rau corrosion thiab degradation nyob rau hauv ib tug ntau yam ntawm cov tshuaj ib puag ncig.

- Acid Resistance

Nws tiv taus cov ntxhia pob zeb hauv av (xws li hydrochloric acid, sulfuric acid) thiab organic acids. Txawm tias muaj zog acids xws li concentrated sulfuric acid muaj me ntsis cuam tshuam rau h-BN.

- Base Resistance

h-BN kuj tiv taus cov tshuaj muaj zog alkaline. Nws tuaj yeem tiv taus cov kev daws teeb meem nrog qib pH siab yam tsis muaj kev hloov pauv tshuaj lom neeg tseem ceeb.

Kev siv ntawm Boron Nitride Plate

Electronic Devices

Cov cuab yeej insulating ntawm h-BN ua rau nws muaj txiaj ntsig hauv kev tsim cov khoom siv hluav taws xob, tshwj xeeb tshaj yog thaum ua ke nrog lwm cov khoom siv ob sab xws li graphene lossis hloov hlau dichalcogenides (TMDs). h-BN tuaj yeem ua cov txheej txheej insulating hauv cov khoom siv no, tiv thaiv kev tsis sib haum xeeb ntawm cov khoom sib txawv.

Thermal Management hauv Electronics

Thaum h-BN yog ib qho hluav taws xob insulator, nws yog ib qho zoo heev thermal conductor. Qhov no ua rau nws muaj txiaj ntsig zoo hauv cov ntawv thov uas yuav tsum muaj hluav taws xob rwb thaiv tsev thiab ua kom muaj cua sov zoo, xws li hauv cov khoom siv hluav taws xob muaj zog.

High-Frequency Applications

Vim nws cov khoom insulating thiab siab thermal conductivity, h-BN yog siv nyob rau hauv high-frequency electronics. Nws tuaj yeem muab tso rau hauv xov tooj cua zaus (RF) thiab cov khoom siv microwave los tiv thaiv kev cuam tshuam ntawm cov khoom.

Kev lag luam semiconductor

Hauv kev tsim khoom semiconductor, h-BN tuaj yeem siv los ua cov khoom siv hluav taws xob lossis cov txheej txheem insulating hauv kev tsim cov khoom siv hluav taws xob. Nws cov qauv siv lead ua zoo thiab cov khoom siv insulating ua rau nws muaj txiaj ntsig zoo hauv kev lag luam no.

Barrier Khoom

h-BN kuj tseem siv los ua cov khoom thaiv hauv cov khoom siv hluav taws xob siab heev. Nws tuaj yeem ua cov txheej txheem tiv thaiv kom tsis txhob kis kab mob lossis oxidation ntawm cov khoom siv semiconductor.
 

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