Metal \u015fekillendirme, seramik ve elektronik sekt\u00f6rleri i\u00e7in yirmi y\u0131l\u0131 a\u015fk\u0131n bir s\u00fcredir ya\u011flay\u0131c\u0131lar ve fonksiyonel tozlar konusunda uzmanl\u0131k kazand\u0131ktan sonra, bor nitr\u00fcr tozunu, kullanmaya ba\u015flad\u0131\u011f\u0131n\u0131zda beklentileri sessizce a\u015fan malzemelerden biri olarak g\u00f6rmeye ba\u015flad\u0131m. \u0130nsanlar genellikle ona \u201cbeyaz grafit\u201d derler \u00e7\u00fcnk\u00fc alt\u0131gen kristal yap\u0131s\u0131 ka\u011f\u0131t \u00fczerinde benzer g\u00f6r\u00fcn\u00fcr, ancak pratikte s\u0131cakl\u0131k y\u00fckseldi\u011finde veya karbon kirlili\u011fi kabul edilemez oldu\u011funda \u00e7ok farkl\u0131 \u2014 ve genellikle daha iyi \u2014 davran\u0131r. Denemeler yapt\u0131m, \u00fcretim hatlar\u0131n\u0131n buna ge\u00e7i\u015fini izledim ve kal\u0131p \u00f6mr\u00fc, y\u00fczey kalitesi ve proses stabilitesindeki fark\u0131 g\u00f6rd\u00fcm. Her zaman en ucuz se\u00e7enek olmayabilir, ancak do\u011fru yerlerde kendini amorti eder.<\/p>\n
Heksagonal bor nitr\u00fcr (h-BN), bor oksit veya borik asidin 1400 \u00b0C'nin \u00fczerindeki s\u0131cakl\u0131klarda amonyak veya azotla reaksiyona sokulmas\u0131yla elde edilir. Ortaya \u00e7\u0131kan toz beyaz, yumu\u015fak ve plaka benzeri olup, katmanlar\u0131 birbirinin \u00fczerinde kolayca kayar. Bu katmanl\u0131 yap\u0131, malzemeye m\u00fckemmel bir kayganl\u0131k sa\u011flar, ancak grafitten farkl\u0131 olarak, yakla\u015f\u0131k 1000 \u00b0C'ye kadar havada ve 1400 \u00b0C'nin \u00e7ok \u00fczerinde inert atmosferlerde kararl\u0131 kal\u0131r. Ayn\u0131 zamanda bir elektrik yal\u0131tkan\u0131d\u0131r ve bir seramik i\u00e7in makul bir termal iletkenli\u011fe sahiptir \u2014 plaket d\u00fczleminde yakla\u015f\u0131k 20\u201330 W\/m\u00b7K. Bu \u00f6zellikler bir araya geldi\u011finde, grafitin oksitlenece\u011fi, karbon i\u00e7erece\u011fi veya elektriksel sorunlara neden olaca\u011f\u0131 durumlarda kullan\u0131\u015fl\u0131 hale getirir.<\/p>\n
S\u0131cak d\u00f6vme ve ekstr\u00fczyon i\u015flemlerinde bor nitr\u00fcr tozu, en \u00e7ok tercih etti\u011fim kal\u0131p ay\u0131r\u0131c\u0131 maddelerden biri haline gelmi\u015ftir. Grafit, orta s\u0131cakl\u0131klarda iyi sonu\u00e7 verir, ancak 700\u2013800 \u00b0C\u2019nin \u00fczerinde yanmaya ba\u015flar ve y\u00fczey kalitesini bozan kal\u0131nt\u0131lar b\u0131rakabilir. Kat\u0131ld\u0131\u011f\u0131m bir al\u00fcminyum ekstr\u00fczyon denemesinde, ayn\u0131 6061 ala\u015f\u0131ml\u0131 k\u00fct\u00fckler \u00fczerinde standart bir grafit-su dispersiyonunu 15 % h-BN dispersiyonuyla kar\u015f\u0131la\u015ft\u0131rd\u0131k. 4.000 k\u00fct\u00fckten sonra, grafit kapl\u0131 kal\u0131plarda g\u00f6zle g\u00f6r\u00fcl\u00fcr a\u015f\u0131nma oluklar\u0131 ortaya \u00e7\u0131kt\u0131 ve parlatma gerektirdi; buna kar\u015f\u0131l\u0131k h-BN kapl\u0131 kal\u0131plar\u0131n y\u00fczeyleri hala p\u00fcr\u00fczs\u00fczd\u00fc ve daha d\u00fc\u015f\u00fck y\u00fczey p\u00fcr\u00fczl\u00fcl\u00fc\u011f\u00fcne (Ra 0,8 \u00b5m'ye kar\u015f\u0131 1,6 \u00b5m) sahip par\u00e7alar \u00fcretti. h-BN ayr\u0131ca ekstr\u00fczyon i\u00e7in gereken kuvveti ortalama olarak yakla\u015f\u0131k azaltt\u0131; bu da daha d\u00fc\u015f\u00fck pres enerjisi ve kal\u0131p de\u011fi\u015fimleri i\u00e7in daha az duru\u015f s\u00fcresi anlam\u0131na geliyordu.<\/p>\n
950 \u00b0C'de paslanmaz \u00e7eli\u011fin s\u0131cak d\u00f6v\u00fclmesinde de benzer kazan\u0131mlar elde ettik. 200 par\u00e7a \u00fczerinde yap\u0131lan kar\u015f\u0131la\u015ft\u0131rmal\u0131 test, h-BN ile ya\u011flanan kal\u0131plarda, i\u015flem sonras\u0131nda profilometre ile \u00f6l\u00e7\u00fclen a\u015f\u0131nma derinli\u011finin daha az oldu\u011funu g\u00f6sterdi. Par\u00e7alar da daha temiz \u00e7\u0131kt\u0131 \u2014 bazen ekstra temizlik ad\u0131mlar\u0131 gerektiren koyu grafit lekeleri yoktu. Dezavantaj\u0131 ise maliyetti: h-BN dispersiyonu litre ba\u015f\u0131na yakla\u015f\u0131k 2,5 kat daha pahal\u0131yd\u0131, ancak kal\u0131plar\u0131n \u00f6mr\u00fcn\u00fcn uzamas\u0131 ve yeniden i\u015fleme ihtiyac\u0131n\u0131n azalmas\u0131, bu \u00f6zel i\u015fte bu maliyeti fazlas\u0131yla telafi etti.<\/p>\n
Seramik ve refrakter end\u00fcstrisinde, bor nitr\u00fcr tozu genellikle sinterleme yard\u0131mc\u0131 maddesi olarak veya f\u0131r\u0131n donan\u0131m\u0131nda y\u00fcksek s\u0131cakl\u0131k ya\u011flay\u0131c\u0131s\u0131 olarak eklenir. Ben bunu, sinterleme sonras\u0131 daha iyi i\u015flenebilirli\u011fe ihtiya\u00e7 duydu\u011fumuz silikon nitr\u00fcr ve al\u00fcmina kompozitlerinde kulland\u0131m. 3\u20135 % ince h-BN (ortalama par\u00e7ac\u0131k boyutu 5\u201310 \u00b5m) eklemek, mukavemetten fazla \u00f6d\u00fcn vermeden pi\u015firilmi\u015f par\u00e7alar\u0131n ta\u015flanmas\u0131n\u0131 kolayla\u015ft\u0131rd\u0131. Yap\u0131lan bir i\u00e7 kar\u015f\u0131la\u015ft\u0131rmada, h-BN i\u00e7eren partilerin elmas disk \u00fczerinde kontrol partisine k\u0131yasla 18 % daha az ta\u015flama s\u00fcresi gerektirdi\u011fi ve kenar \u00e7entiklenmesinin belirgin \u015fekilde azald\u0131\u011f\u0131 g\u00f6r\u00fclm\u00fc\u015ft\u00fcr.<\/p>\n
Is\u0131 y\u00f6netimi, bu maddenin bariz bir de\u011fer sundu\u011fu bir ba\u015fka aland\u0131r. Elektronik sekt\u00f6r\u00fcnde h-BN, \u0131s\u0131y\u0131 iletirken elektriksel yal\u0131tkanl\u0131\u011f\u0131n\u0131 korudu\u011fu i\u00e7in termal aray\u00fcz malzemeleri ve kal\u0131plama bile\u015fiklerinde dolgu maddesi olarak kullan\u0131lmaktad\u0131r. Birka\u00e7 y\u0131l \u00f6nce yapt\u0131\u011f\u0131m\u0131z basit bir laboratuvar kar\u015f\u0131la\u015ft\u0131rmas\u0131nda, 30 % al\u00fcmina ile doldurulmu\u015f bir silikon gres, yakla\u015f\u0131k 1,1 W\/m\u00b7K de\u011ferine ula\u015fm\u0131\u015ft\u0131r. Ayn\u0131 baz, 30 % h-BN (daha b\u00fcy\u00fck plakat s\u0131n\u0131f\u0131) ile dolduruldu\u011funda, korumal\u0131 bir \u0131s\u0131 ak\u0131\u015f \u00f6l\u00e7er kullan\u0131larak ayn\u0131 test ko\u015fullar\u0131 alt\u0131nda 2,4 W\/m\u00b7K de\u011ferine ula\u015fm\u0131\u015ft\u0131r. h-BN versiyonu ayr\u0131ca d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda daha yumu\u015fak kalm\u0131\u015ft\u0131r, bu da p\u00fcr\u00fczl\u00fc y\u00fczeylerde temas direncini art\u0131rm\u0131\u015ft\u0131r.<\/p>\n
Elbette bor nitr\u00fcr sihirli bir malzeme de\u011fildir. Grafit veya talk tozundan daha pahal\u0131d\u0131r ve \u00e7ok ince taneli t\u00fcrleri tozlu olabilir; bu nedenle kullan\u0131m s\u0131ras\u0131nda iyi bir havaland\u0131rma gerektirir. A\u015f\u0131r\u0131 bas\u0131n\u00e7 gerektiren baz\u0131 metal \u015fekillendirme uygulamalar\u0131nda, molibden dis\u00fclf\u00fcr veya \u00f6zel sentetik ya\u011flay\u0131c\u0131lar, yaln\u0131zca s\u00fcrt\u00fcnme katsay\u0131s\u0131 a\u00e7\u0131s\u0131ndan bile bor nitr\u00fcrden daha iyi performans g\u00f6sterebilir. Par\u00e7ac\u0131k boyutu ve safl\u0131\u011f\u0131 \u00e7ok \u00f6nemlidir \u2014 daha kaba kaliteler daha iyi ayr\u0131lma sa\u011flar ancak daha zay\u0131f da\u011f\u0131l\u0131m g\u00f6sterirken, y\u00fcksek safl\u0131kta kaliteler elektronik veya kozmetik sekt\u00f6rleri i\u00e7in vazge\u00e7ilmezdir.<\/p>\n
Deneyimlerime g\u00f6re, en iyi sonu\u00e7lar malzeme s\u0131n\u0131f\u0131n\u0131 i\u015fin gerekliliklerine uygun hale getirmekle elde edilir. S\u0131cak metal \u015fekillendirme i\u00e7in genellikle ak\u0131\u015fkanl\u0131\u011f\u0131 iyi olan 10\u201320 \u00b5m'lik pullar \u00f6neririm. Termal dolgu maddeleri veya kozmetik \u00fcr\u00fcnlerinde ise, y\u00fczey alan\u0131 kontroll\u00fc 10 \u00b5m'nin alt\u0131ndaki, hatta mikron alt\u0131 s\u0131n\u0131flar daha iyi sonu\u00e7 verir. Genel veri sayfalar\u0131na g\u00fcvenmek yerine, her zaman ger\u00e7ek ekipman ve malzemelerinizle uygun bir deneme yap\u0131n. Bunu yapt\u0131\u011f\u0131m\u0131z durumlarda, bor nitr\u00fcr tozlar\u0131, daha y\u00fcksek malzeme maliyetini hakl\u0131 \u00e7\u0131karan, tak\u0131m \u00f6mr\u00fc, enerji kullan\u0131m\u0131 veya \u00fcr\u00fcn kalitesinde \u00f6l\u00e7\u00fclebilir iyile\u015ftirmeler sa\u011flam\u0131\u015ft\u0131r.<\/p>\n
Di\u011fer t\u00fcm ya\u011flay\u0131c\u0131lar\u0131n veya dolgu maddelerinin yerini asla alamaz, ancak s\u00fcre\u00e7te y\u00fcksek s\u0131cakl\u0131k, temizlik gereklili\u011fi veya termal performans\u0131n yan\u0131 s\u0131ra elektrik yal\u0131t\u0131m\u0131 s\u00f6z konusu oldu\u011funda, bor nitr\u00fcr tozu benim alet \u00e7antamda kal\u0131c\u0131 bir yer edinmi\u015ftir. Anahtar, di\u011fer t\u00fcm \u00f6zel malzemelerde oldu\u011fu gibi yine ayn\u0131d\u0131r: belirli ko\u015fullar\u0131n\u0131zda ne i\u015fe yarad\u0131\u011f\u0131n\u0131 anlay\u0131n, uygun \u015fekilde test edin ve performans kazanc\u0131n\u0131n varsay\u0131lan de\u011fil, ger\u00e7ek oldu\u011fu yerlerde kullan\u0131n.<\/p>","protected":false},"excerpt":{"rendered":"
After more than twenty years specifying lubricants and functional powders for metal forming, ceramics, and electronics, I\u2019ve come to treat […]<\/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":[11],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts\/329"}],"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=329"}],"version-history":[{"count":1,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts\/329\/revisions"}],"predecessor-version":[{"id":330,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/posts\/329\/revisions\/330"}],"wp:attachment":[{"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/media?parent=329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/categories?post=329"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boronnitrideceramic.com\/tr\/wp-json\/wp\/v2\/tags?post=329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}