Az emberek a hexagon\u00e1lis b\u00f3r-nitridet feh\u00e9r grafitnak nevezik, mert a krist\u00e1lyszerkezet\u00fck hasonl\u00f3 elven m\u0171k\u00f6dik: egym\u00e1sra rak\u00f3d\u00f3, egym\u00e1s mellett elcs\u00fasz\u00f3 r\u00e9tegek. Ez\u00e9rt \u00e9rz\u0151dik cs\u00fasz\u00f3snak a sz\u00e1raz h-BN-r\u00e9teg. Az \u00f6sszehasonl\u00edt\u00e1s azonban m\u00e1r nem \u00e9rv\u00e9nyes, amint a feladat h\u0151hat\u00e1snak, oxid\u00e1ci\u00f3nak vagy elektromos fesz\u00fclts\u00e9gnek van kit\u00e9ve. A grafit vezet\u0151 anyag, \u00e9s a leveg\u0151n 500\u2013600 \u00b0C k\u00f6r\u00fcl kezd oxid\u00e1l\u00f3dni. A hexagon\u00e1lis BN szigetel\u0151 marad, \u00e9s a leveg\u0151ben 900\u20131000 \u00b0C-ot tekintj\u00fck a gyakorlati oxid\u00e1ci\u00f3s tartom\u00e1nynak. Nitrog\u00e9nben vagy v\u00e1kuumban ez a h\u0151m\u00e9rs\u00e9klet j\u00f3val magasabb, ak\u00e1r 2000 \u00b0C-ig \u00e9s azon t\u00fal is. Ez az oka annak, hogy sz\u00e9n helyett BN-t \u00edrunk el\u0151, amikor a bevonatnak ki kell b\u00edrnia a h\u0151t, \u00e9s dielektrikusnak kell maradnia.<\/p>\n
A bevonatokhoz forgalmazott porunk \u00e1ltal\u00e1ban lemezszer\u0171 h-BN, gyakran n\u00e9h\u00e1ny mikronos m\u00e9ret\u0171, n\u00e9ha pedig finomabb, a sima permetez\u00e9s \u00e9rdek\u00e9ben. K\u00f6t\u0151anyagba keverve form\u00e1k, szersz\u00e1mok, \u00f6nt\u0151kanalak \u00e9s h\u0151elemcs\u00f6vek lev\u00e1laszt\u00f3fest\u00e9k\u00e9v\u00e9 v\u00e1lik. Az olvadt alum\u00edniummal kapcsolatos hasznos tr\u00fckk a nedves\u00edt\u00e9s. Az alum\u00ednium nagy \u00e9rintkez\u00e9si sz\u00f6gben \u00fcl a b\u00f3r-nitriden \u2013 a k\u00f6zz\u00e9tett, r\u00f6gz\u00edtett cseppekkel v\u00e9gzett k\u00eds\u00e9rletek szerint k\u00f6r\u00fclbel\u00fcl 160\u00b0-t\u00f3l 900\u00b0C-ig \u2013, \u00edgy a f\u00e9m nem tapad a ker\u00e1mi\u00e1hoz \u00fagy, ahogyan az alum\u00ednium-oxidhoz vagy egy piszkos ac\u00e9l talphoz tapad. Leszedj\u00fck a felesleget, ki\u00f6ntj\u00fck, lekopogtatjuk a marad\u00e9kot. A grafit is k\u00e9pes lev\u00e1laszt\u00e1sra, am\u00edg meg nem \u00e9g, \u00e9s sz\u00e9nfoltot vagy lyukat nem hagy maga ut\u00e1n. A BN feh\u00e9r r\u00e9teget hagy maga ut\u00e1n. Azok a m\u0171helyek, amelyek mos\u00f3cs\u00f6veket \u00e9s mer\u00fcl\u0151cs\u00f6veket bevonnak, egy h\u00e9t m\u00falva veszik \u00e9szre a k\u00fcl\u00f6nbs\u00e9get, nem pedig egy laborat\u00f3riumi el\u0151ad\u00e1s ut\u00e1n.<\/p>\n
A h\u0151vezet\u0151 k\u00e9pess\u00e9g megfelel\u0151, \u00e9s egykrist\u00e1lyban er\u0151sen anizotr\u00f3p. Melegen sajtolt alkatr\u00e9szekben vagy bevonatokban \u00e1tlagosabb \u00e9rt\u00e9ket kapunk, amely azonban m\u00e9g \u00edgy is el\u00e9g magas ahhoz, hogy a b\u00f3r-nitrid ker\u00e1mi\u00e1t olyan helyeken alkalmazz\u00e1k, ahol a h\u0151nek el kell jutnia, az \u00e1ramnak viszont nem: h\u0151terel\u0151k, h\u0151vezet\u0151 bevonatok, magas h\u0151m\u00e9rs\u00e9klet\u0171 elektromos szigetel\u00e9s. Ez a kombin\u00e1ci\u00f3 \u2013 h\u0151vezet\u00e9s \u00e9s \u00e1ramg\u00e1tl\u00e1s \u2013 nem jellemz\u0151 a grafitra. A grafit mindk\u00e9t tulajdons\u00e1got a szigetel\u0151 anyagok szempontj\u00e1b\u00f3l nem k\u00edv\u00e1nt ir\u00e1nyban mutatja.<\/p>\n
A k\u00f6b\u00f6s BN egy teljesen m\u00e1s anyag. Ugyanazok az elemek, gy\u00e9m\u00e1ntszer\u0171 r\u00e1csszerkezet, v\u00e1g\u00f3szersz\u00e1m-kem\u00e9nys\u00e9g. Ne rendeljen c-BN-t, ha bevonatot szeretne, \u00e9s ne v\u00e1rja el, hogy egy fest\u00e9kmin\u0151s\u00e9g\u0171 h-BN-porral ac\u00e9lt lehessen megmunk\u00e1lni. A pirolitikus BN pedig egy teljesen m\u00e1s min\u0151s\u00e9g: CVD-lemezek \u00e9s t\u00e9gelyek f\u00e9lvezet\u0151ipari munk\u00e1khoz, nagyon tiszta, nagyon dr\u00e1ga. Ipari megrendel\u00e9seink t\u00f6bbs\u00e9ge tov\u00e1bbra is a hexagon\u00e1lis porra \u00e9s a melegen sajtolt form\u00e1kra ir\u00e1nyul.<\/p>\n
Az h-BN alacsony h\u0151m\u00e9rs\u00e9kleten nem var\u00e1zslatos. K\u00f6r\u00fclbel\u00fcl 600 \u00b0C alatt a grafitnak gyakran alacsonyabb a s\u00farl\u00f3d\u00e1si egy\u00fctthat\u00f3ja. A BN akkor ker\u00fcl el\u0151nybe, amikor a grafit oxid\u00e1l\u00f3dni kezd. A nedvess\u00e9g, az olaj \u00e9s a vastag, h\u00e1ml\u00f3 bevonat t\u00f6nkreteszi a j\u00f3 min\u0151s\u00e9g\u0171 port. V\u00e9kony, egyenletes, sz\u00e1raz r\u00e9teget kell felvinni, \u00e9s amikor a feh\u00e9r sz\u00edn elt\u0171nik, \u00fajra kell felvinni. Ha az olvasztott anyag alum\u00ednium vagy magn\u00e9zium, \u00e9s a szersz\u00e1mnak tiszt\u00e1nak \u00e9s elektromosan zavartalannak kell maradnia, akkor a hexagon\u00e1lis b\u00f3r-nitrid az a ken\u0151anyag, amely akkor is megmarad, amikor a grafit m\u00e1r CO\u2082-v\u00e1 alakult.<\/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\/hu\/wp-json\/wp\/v2\/posts\/337"}],"collection":[{"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":1,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":338,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/posts\/337\/revisions\/338"}],"wp:attachment":[{"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/hu\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}