\u0130nsanlar alt\u0131gen bor nitridi \u201cbeyaz grafit\u201d olarak adland\u0131r\u0131r, \u00e7\u00fcnk\u00fc kristal yap\u0131s\u0131 ayn\u0131 prensibe dayan\u0131r: kayma hareketi g\u00f6steren \u00fcst \u00fcste y\u0131\u011f\u0131lm\u0131\u015f plakalar. Bu nedenle kuru bir h-BN tabakas\u0131 kaygan bir his verir. Ancak i\u015f ortam\u0131 s\u0131cak, oksitleyici veya elektrik ak\u0131m\u0131 ta\u015f\u0131yan bir durum oldu\u011funda bu kar\u015f\u0131la\u015ft\u0131rma art\u0131k ge\u00e7erlili\u011fini yitirir. Grafit bir iletkendir ve havada yakla\u015f\u0131k 500\u2013600\u00b0C'de oksitlenmeye ba\u015flar. Heksagonal BN yal\u0131tkanl\u0131\u011f\u0131n\u0131 korur ve havada 900\u20131000\u00b0C'yi pratik oksitlenme aral\u0131\u011f\u0131 olarak kabul ederiz. Azot veya vakum ortam\u0131nda bu s\u0131cakl\u0131k \u00e7ok daha y\u00fckse\u011fe, 2000\u00b0C ve \u00f6tesine \u00e7\u0131kar. Kaplaman\u0131n \u0131s\u0131ya dayanmas\u0131 ve dielektrik \u00f6zelli\u011fini korumas\u0131 gerekti\u011finde karbon yerine BN'yi tercih etmemizin nedeni budur.<\/p>\n
Kaplama ama\u00e7l\u0131 satt\u0131\u011f\u0131m\u0131z toz, genellikle plaka benzeri h-BN\u2019dir; \u00e7o\u011fu zaman birka\u00e7 mikron aral\u0131\u011f\u0131ndad\u0131r, p\u00fcr\u00fczs\u00fcz bir p\u00fcsk\u00fcrtme i\u00e7in bazen daha ince de olabilir. Bir ba\u011flay\u0131c\u0131ya kar\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda kal\u0131plar, kal\u0131p kal\u0131plar\u0131, d\u00f6k\u00fcm kep\u00e7eleri ve termokupl t\u00fcpleri i\u00e7in ay\u0131r\u0131c\u0131 boya haline gelir. Erimi\u015f al\u00fcminyumda i\u015fe yarayan p\u00fcf noktas\u0131 \u0131slatmad\u0131r. Al\u00fcminyum, bor nitr\u00fcr \u00fczerinde y\u00fcksek bir temas a\u00e7\u0131s\u0131yla durur \u2014 yay\u0131nlanm\u0131\u015f sabit damla \u00e7al\u0131\u015fmalar\u0131nda 900\u00b0C\u2019ye kadar yakla\u015f\u0131k 160\u00b0 \u2014 bu sayede metal, al\u00fcmina veya kirli bir \u00e7elik ayakkab\u0131ya tutundu\u011fu gibi serami\u011fe tutunmaz. \u00dcst\u00fcn\u00fc s\u0131y\u0131r\u0131n, d\u00f6k\u00fcn, kabu\u011funu k\u0131r\u0131n. Grafit de ayr\u0131lma sa\u011flayabilir, ancak yanana ve karbon lekesi ya da \u00e7ukur b\u0131rakana kadar. BN ise beyaz bir film tabakas\u0131 b\u0131rak\u0131r. Y\u0131kama kanallar\u0131n\u0131 ve dald\u0131rma borular\u0131n\u0131 kaplayan at\u00f6lyeler, bu fark\u0131 laboratuvar konu\u015fmas\u0131ndan sonra de\u011fil, bir hafta sonra fark ederler.<\/p>\n
Termal iletkenlik, tek kristalde olduk\u00e7a iyi seviyededir ve g\u00fc\u00e7l\u00fc bir \u015fekilde anizotropiktir. S\u0131cak preslenmi\u015f bir par\u00e7ada veya kaplamada daha ortalama bir de\u011fer elde edilir; ancak bu de\u011fer yine de, \u0131s\u0131n\u0131n ta\u015f\u0131nmas\u0131 gereken ancak ak\u0131m\u0131n ge\u00e7emedi\u011fi yerlerde bor nitr\u00fcr serami\u011finin kullan\u0131lmas\u0131 i\u00e7in yeterince y\u00fcksektir: \u0131s\u0131 da\u011f\u0131t\u0131c\u0131lar, ayarlay\u0131c\u0131 kaplamalar, y\u00fcksek s\u0131cakl\u0131k elektrik yal\u0131t\u0131m\u0131. Bu kombinasyon \u2014 \u0131s\u0131y\u0131 iletmek, ak\u0131m\u0131 engellemek \u2014 grafitin bir \u00f6zelli\u011fi de\u011fildir. Grafit, bir yal\u0131tkan i\u00e7in her ikisini de yanl\u0131\u015f y\u00f6nde ger\u00e7ekle\u015ftirir.<\/p>\n
K\u00fcbik BN farkl\u0131 bir malzemedir. Ayn\u0131 elementler, elmas benzeri kristal yap\u0131, kesici alet sertli\u011fi. Serbest b\u0131rakma kaplamas\u0131 demek istedi\u011finizde c-BN sipari\u015f etmeyin ve boya s\u0131n\u0131f\u0131 h-BN tozunun \u00e7eli\u011fi i\u015fleyebilece\u011fini beklemeyin. Pirolitik BN ise yine ba\u015fka bir s\u0131n\u0131ft\u0131r: Yar\u0131 iletken i\u015fleri i\u00e7in CVD plakalar\u0131 ve potalar, \u00e7ok saf, \u00e7ok pahal\u0131d\u0131r. End\u00fcstriyel taleplerimizin \u00e7o\u011fu h\u00e2l\u00e2 alt\u0131gen toz ve s\u0131cak preslenmi\u015f \u015fekillerdir.<\/p>\n
h-BN, d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda sihirli bir malzeme de\u011fildir. Yakla\u015f\u0131k 600 \u00b0C\u2019nin alt\u0131nda grafitin s\u00fcrt\u00fcnme katsay\u0131s\u0131 genellikle daha d\u00fc\u015f\u00fckt\u00fcr. Grafit oksitlenmeye ba\u015flad\u0131\u011f\u0131nda BN \u00f6ne ge\u00e7er. Nem, ya\u011f ve kal\u0131n, pul pul d\u00f6k\u00fclen bir tabaka, iyi bir tozu bozar. \u0130nce, d\u00fczg\u00fcn ve kuru bir tabaka uygulay\u0131n; beyazl\u0131k kayboldu\u011funda yeniden uygulay\u0131n. Eriyik al\u00fcminyum veya magnezyum ise ve aletin temiz ve elektriksel olarak sessiz kalmas\u0131 gerekiyorsa, grafit CO\u2082\u2019ye d\u00f6n\u00fc\u015ft\u00fckten sonra bile yerinde kalan ya\u011flay\u0131c\u0131 alt\u0131gen bor nitr\u00fcrd\u00fcr.<\/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\/tr\/wp-json\/wp\/v2\/posts\/337"}],"collection":[{"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":1,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":338,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts\/337\/revisions\/338"}],"wp:attachment":[{"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}