\u017dmon\u0117s \u0161e\u0161iakamp\u012f boro nitrid\u0105 vadina \u201ebaltuoju grafitu\u201c, nes jo kristalin\u0117 strukt\u016bra pagr\u012fsta ta pa\u010dia id\u0117ja: susikaupusios plok\u0161tel\u0117s, kurios slysta viena nuo kitos. B\u016btent tod\u0117l sausa h-BN pl\u0117vel\u0117 lie\u010diasi slid\u017eiai. Ta\u010diau \u0161is palyginimas tampa nebeaktualus, kai darbas susij\u0119s su kar\u0161\u010diu, oksidacija arba elektros srove. Grafitas yra laidininkas ir ore pradeda oksiduotis esant ma\u017edaug 500\u2013600 \u00b0C temperat\u016brai. \u0160e\u0161iakampis BN i\u0161lieka izoliuojantis, o ore 900\u20131000 \u00b0C laikome praktiniu oksidacijos intervalu. Azoto aplinkoje arba vakuume \u0161i riba pakyla daug auk\u0161\u010diau \u2013 iki 2000 \u00b0C ir dar auk\u0161\u010diau. B\u016btent d\u0117l to, kai danga turi atlaikyti kar\u0161t\u012f ir i\u0161likti dielektrine, mes nurodome naudoti BN, o ne angl\u012f.<\/p>\n
M\u016bs\u0173 parduodami milteliai, skirti dangoms, paprastai yra plok\u0161teli\u0173 formos h-BN, da\u017enai keli\u0173 mikron\u0173 dyd\u017eio, kartais smulkesni, kad pur\u0161kimo sluoksnis b\u016bt\u0173 lygus. Sumai\u0161yti su ri\u0161ikliu jie tampa atpalaiduojan\u010diais da\u017eais, skirtais formoms, \u0161tampams, kau\u0161ams ir termopar\u0173 vamzdeliams. Naudinga gudryb\u0117 dirbant su i\u0161lydytu aliuminiu yra dr\u0117kinimas. Aliuminis ant boro nitrido susidaro didelis s\u0105ly\u010dio kampas \u2013 paskelbtuose tyrimuose su nejudan\u010diais la\u0161ais jis svyruoja nuo ma\u017edaug 160\u00b0 iki 900\u00b0C \u2013 tod\u0117l metalas neprilimpa prie keramikos taip, kaip prilimpa prie aliuminio oksido ar ne\u0161varaus plieninio pado. Nuimkite plon\u0105 sluoksn\u012f, i\u0161pilkite, nupl\u0117\u0161kite liku\u010dius. Grafitas taip pat gali atskirti, kol nesudega ir nepalieka anglies d\u0117m\u0117s ar duobut\u0117s. BN palieka balt\u0105 pl\u0117vel\u0119. Dirbtuv\u0117s, kuriose dengiami plovimo kanalai ir panardinimo vamzdeliai, skirtum\u0105 pastebi po savait\u0117s, o ne po laboratorin\u0117s paskaitos.<\/p>\n
\u0160ilumos laidumas yra pakankamai geras ir vienkristale pasi\u017eymi stipriu anizotropi\u0161kumu. Kar\u0161tai presuotoje detal\u0117je ar dangoje gaunamas labiau vidutinis rodiklis, ta\u010diau jis vis tiek yra pakankamai auk\u0161tas, kad boro nitrido keramika b\u016bt\u0173 naudojama ten, kur turi jud\u0117ti \u0161iluma, o srov\u0117 \u2013 ne: \u0161ilumos skirstytuvuose, fiksavimo dangose, auk\u0161tos temperat\u016bros elektrin\u0117je izoliacijoje. \u0160is derinys \u2013 \u0161ilumos laidumas ir srov\u0117s blokavimas \u2013 n\u0117ra b\u016bdingas grafitui. Grafitas abu \u0161iuos rei\u0161kinius atlieka izoliatoriui netinkama kryptimi.<\/p>\n
Kubinis BN yra visi\u0161kai kitokia med\u017eiaga. Tie patys elementai, deimantui pana\u0161us kristalinis tinklas, pjovimo \u012frankio kietumas. Neu\u017esakykite c-BN, jei tur\u0117jote omenyje atpalaiduojan\u010di\u0105 dang\u0105, ir nesitik\u0117kite, kad da\u017eams skirtas h-BN milteliai tinka plieno apdirbimui. Pirolizinis BN yra dar kita r\u016b\u0161is: CVD plok\u0161t\u0117s ir tigliai, skirti puslaidininki\u0173 gamybai, labai gryni, labai brang\u016bs. Dauguma m\u016bs\u0173 pramonini\u0173 u\u017esakym\u0173 vis dar susij\u0119 su \u0161e\u0161iakampiais milteliais ir kar\u0161tai presuotomis formomis.<\/p>\n
\u017demoje temperat\u016broje h-BN n\u0117ra stebuklingas. Esant temperat\u016brai \u017eemiau ma\u017edaug 600 \u00b0C, grafitas da\u017enai pasi\u017eymi ma\u017eesniu trinties koeficientu. BN prana\u0161um\u0105 \u012fgyja, kai grafitas pradeda oksiduotis. Dr\u0117gm\u0117, alyva ir storas, pleiskanojantis sluoksnis sugadina ger\u0105 milteli\u0173 sluoksn\u012f. Sluoksnis turi b\u016bti plonas, tolygus, sausas ir u\u017ededamas i\u0161 naujo, kai balta spalva i\u0161nyksta. Jei lydomas aliuminis arba magnis, o \u012frankis turi i\u0161likti \u0161varus ir elektros po\u017ei\u016briu \u201etylus\u201c, \u0161e\u0161iakampis boro nitridas yra ta tepimo med\u017eiaga, kuri i\u0161lieka net tada, kai grafitas virsta CO\u2082.<\/p>","protected":false},"excerpt":{"rendered":"
Hexagonal Boron Nitride Is Graphite That Does Not Conduct and Does Not Burn Off at 600\u00b0C People call hexagonal boron […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ngg_post_thumbnail":0,"footnotes":""},"categories":[4],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/posts\/337"}],"collection":[{"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":1,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":338,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/posts\/337\/revisions\/338"}],"wp:attachment":[{"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/lt\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}