Yav Tom Ntej Muaj Peev Xwm Ntawm Boron Nitride

Vim tias lub siab hardness ntawm steel cov ntaub ntawv, ntau ntawm cov cua sov yog tsim thaum lub sijhawm ua haujlwm. Cov cuab yeej pob zeb diamond yog yooj yim rau kev xaim ntawm qhov kub thiab txias thiab yooj yim hnov ​​mob nrog cov hloov hlau. C-BN cov ntaub ntawv muaj qhov ua haujlwm zoo thermal stability thiab tsis yooj yim rau cov tshuaj tiv thaiv nrog hlau pawg hlau lossis alloys. Cov tshuaj tiv thaiv, tuaj yeem siv dav hauv kev ua tiav, kev sib tsoo, thiab lwm yam ntawm cov khoom siv steel. Ntxiv nrog rau kev hnav zoo heev, c-BN kuj muaj kev tiv thaiv zoo kub. Nws tuaj yeem tuaj yeem txiav cov khoom kub-tiv taus steel, ferroalloy, tawv tawv steel, thiab lwm yam, thiab tuaj yeem txiav qhov siab-hard chilled rolls thiab infiltrate ntawm qhov kub siab txiav. Cov pa roj carbon quenching thiab Si-A1 alloy uas hnyav heev rau cov cuab yeej coj. Qhov tseeb, txiav cov cuab yeej thiab cov cuab yeej abrasive ua los ntawm sintered lub cev ntawm c-BN siv lead ua (sib txuas ua haujlwm ntawm qhov kub thiab siab siab) tau siv nyob rau hauv kev kub ceev precision machining ntawm ntau cov ntaub ntawv cemented carbide.

Raws li qhov sib txawv ntawm cov kis (band sib txawv 6.4 eV) cov khoom siv semiconductor khoom, C-BN muaj cov thermal conductivity, siab resistivity, siab dua, muaj peev xwm tsawg, tsis tshua muaj hluav taws xob tsis tu ncua, lub siab hluav taws xob hauv cheeb tsam, thiab tuaj yeem paub ob hom doping thiab nws muaj qhov zoo nyob ruaj khov. Ua ke nrog pob zeb diamond, SiC thiab GaN, nws yog hu ua cov khoom siv hluav taws xob thib peb tiam tom qab Si, Ge thiab GaAs. Lawv cov peev xwm yog qhov dav dav dav sib txawv, uas tsim nyog rau kev siv hluav taws xob siv nyob rau hauv qhov xwm txheej ceev. Ntaus ntawv. Cov lus 10.6 muab piv rau ntau yam. Nws tsis yog qhov nyuaj kom pom tias piv nrog SiC thiab GaN, C-BN thiab pob zeb diamond muaj cov yam ntxwv zoo dua, xws li dav dav kis, ntau dua ntawm tes, thiab ntau qhov cuam tshuam hluav taws xob hluav taws xob, qis dua dielectric tas mus li thiab siab dua thermal conductivity. Pom tseeb li cov khoom siv hluav taws xob tsis txaus, C-BN thiab pob zeb diamond zoo dua. Txawm li cas los xij, raws li cov khoom siv semiconductor, pob zeb diamond muaj nws txoj kev tuag tsis zoo, uas yog, n-hom doping ntawm pob zeb diamond yog qhov nyuaj heev (kev tawm tsam ntawm n-hom doping tsuas tuaj yeem ncav cuag 102 Ω · cm, uas deb ntawm cov qauv cuab yeej) , thaum c-BN Puas tuaj yeem ua tiav hom ob hom doping. Piv txwv li, nyob rau hauv cov txheej txheem ntawm kev kub thiab siab hloov ua ke khoom thiab nyias zaj duab xis npaj, ntxiv Yuav tau txais p-hom semiconductor; Ntxiv S, C, Si, etc. tuaj yeem txais n-hom semiconductor. Yog li no, feem ntau, c-BN yog cov khoom siv semiconductor thib peb tiam uas muaj kev ua tau zoo tshaj plaws. Nws tsis tuaj yeem tsuas yog siv los npaj cov khoom siv hluav taws xob uas ua haujlwm nyob rau hauv qhov xwm txheej huab xws li kub, siab, thiab lub zog loj, tab sis kuj muaj qhov zoo hauv kev sib sib zog nqus ultraviolet luminescence thiab cov kuaj. Kev thov dav dav. Qhov tseeb, Mishima li al. thawj zaug tshaj tawm tias c-BN lub teeb ci ua rau muaj qhov kub thiab kub ua rau muaj peev xwm ua haujlwm nyob rau qhov kub siab txog 650 ° C. Hauv qab kev tsis ncaj ncees, lub diode emits lub teeb xiav kom pom lub ntsej muag liab qab, thiab cov ntsuas kev ntsuas pom tias nws yog qhov luv tshaj. Lub wavelength yog 215 nm (5.8 eV). C-BN muaj qhov ua haujlwm thermal expansion coefficient zoo ib yam li GaAs thiab Si, siab thermal conductivity thiab qis dielectric tsis tu ncua, kev ua haujlwm zoo rwb thaiv tsev, thiab zoo tshuaj lom neeg ruaj khov, ua rau nws muaj cov khoom siv ua cua sov thiab insulating txheej rau kev sib xyaw. Tsis tas li ntawd, C-BN muaj qhov tsis zoo hluav taws xob tsis zoo, tuaj yeem siv ua txias txias cathode teb emission khoom, thiab muaj ntau cov ntawv thov kev cia siab rau thaj tsam ntawm cov chaw tiaj tiaj tiaj tiaj zaub.

Hais txog kev siv kho qhov muag, vim lub siab hardness ntawm c-BN zaj duab xis thiab lub siab sib kis nyob rau hauv tag nrho wavelength los ntawm ultraviolet (kwv yees li pib ntawm 200 nm) mus rau deb infrared, nws yog haum raws li txheej txheej rau qee qhov kho qhov muag, tshwj xeeb tshaj yog raws li txheej ntawm lub qhov rais cov khoom siv xws li zinc selenide (ZnSe) thiab zinc sulfide (ZnS). Tsis tas li ntawd, nws muaj zoo thermal shock tsis kam thiab ua lag luam hardness, thiab xav pom los ua qhov zoo tshaj plaws lub qhov rai khoom siv rau cov tshuab hluav taws xob siab thiab cov kuaj ntsuas.