Oxid hlinit\u00fd je standardn\u00edm keramick\u00fdm substr\u00e1tem z dobr\u00e9ho d\u016fvodu. Je levn\u00fd, pevn\u00fd a snadno se pokovuje. Jako tepeln\u00e1 trubice v\u0161ak nen\u00ed p\u0159\u00edli\u0161 \u00fa\u010dinn\u00fd. Deska z materi\u00e1lu 96% (Al\u2082O\u2083) m\u00e1 tepelnou vodivost kolem 20\u201330 W\/m\u00b7K. Nitrid hlin\u00edku, je-li spr\u00e1vn\u011b zpracov\u00e1n, dosahuje hodnot v rozmez\u00ed 170\u2013200 W\/m\u00b7K, n\u011bkdy i m\u00edrn\u011b p\u0159es 200. Teoretick\u00e1 hodnota pro dokonal\u00fd monokrystal se bl\u00ed\u017e\u00ed 320. Nikdo v\u0161ak takov\u00fd produkt nevyr\u00e1b\u00ed. To, co dod\u00e1v\u00e1me, je slinut\u00fd izol\u00e1tor, kter\u00fd dok\u00e1\u017ee odv\u00e1d\u011bt teplo z \u010dipu v\u00fdkonov\u00e9ho modulu, ani\u017e by se stal vodi\u010dem.<\/p>\n
Pr\u00e1v\u011b v t\u00e9to kombinaci spo\u010d\u00edv\u00e1 podstata v\u011bci. Kovy vedou teplo i elektrick\u00fd proud. V\u011bt\u0161ina keramick\u00fdch materi\u00e1l\u016f blokuje proud a zadr\u017euje teplo. Nitrid hlin\u00edku zaji\u0161\u0165uje sou\u010dasn\u011b veden\u00ed tepla i izolaci, p\u0159i\u010dem\u017e jeho koeficient tepeln\u00e9 rozta\u017enosti (CTE) se pohybuje kolem 4,5 ppm\/\u00b0C \u2013 co\u017e se bl\u00ed\u017e\u00ed k\u0159em\u00edku. Oxid hlinit\u00fd se roztahuje sp\u00ed\u0161e v rozmez\u00ed 6,5\u20137,5. U vysoce v\u00fdkonn\u00fdch IGBT nebo SiC sou\u010d\u00e1stek se tato neshoda projevuje \u00fanavou p\u00e1jky a odlupov\u00e1n\u00edm m\u011bd\u011bn\u00e9 f\u00f3lie. BeO vede elekt\u0159inu je\u0161t\u011b l\u00e9pe, a p\u0159esto se mu vyh\u00fdb\u00e1me, kdykoli je to mo\u017en\u00e9. Toxicita nen\u00ed pouhou pozn\u00e1mkou v technick\u00e9m listu.<\/p>\n
Kysl\u00edk je ne\u010distota, kter\u00e1 kaz\u00ed v\u00fdsledky m\u011b\u0159en\u00ed vodivosti. M\u0159\u00ed\u017ekov\u00fd kysl\u00edk vytv\u00e1\u0159\u00ed v hlin\u00edku vakance. Fonony se rozptyluj\u00ed. Pr\u00e1\u0161ek s obsahem n\u011bkolika procent kysl\u00edku se po slinov\u00e1n\u00ed zm\u011bn\u00ed na l\u00e1tku, kter\u00e1 vypad\u00e1 jako AlN a jej\u00ed\u017e vodivost se bl\u00ed\u017e\u00ed hodnot\u011b 100 W\/m\u00b7K. Pr\u00e1\u0161ek s n\u00edzk\u00fdm obsahem kysl\u00edku spolu se slinovac\u00ed p\u0159\u00edsadou, kter\u00e1 vtahuje kysl\u00edk do f\u00e1ze na hranic\u00edch zrn \u2014 obvykle se pou\u017e\u00edv\u00e1 yttrium \u2014, je zp\u016fsob, jak dos\u00e1hnout t\u0159\u00eddy s hodnotou p\u0159es 170. Hustota mus\u00ed b\u00fdt vysok\u00e1. Zbytkov\u00e9 p\u00f3ry p\u0159edstavuj\u00ed dal\u0161\u00ed m\u00edsta rozptylu. Tak\u017ee \u201cAlN substr\u00e1t\u201d na PO nen\u00ed t\u0159\u00edda. Ptejte se na tepelnou vodivost, ne jen na chemick\u00e9 slo\u017een\u00ed.<\/p>\n
Pr\u00e1v\u011b p\u0159i manipulaci s pr\u00e1\u0161kem b\u00fdvaj\u00ed d\u00edlny zasko\u010deny. Jemn\u00fd AlN se hydrolyzuje. Nechte ho ve vlhk\u00e9m vzduchu a vytvo\u0159\u00ed se na n\u011bm vrstva hydroxidu, \u010d\u00edm\u017e se zv\u00fd\u0161\u00ed obsah kysl\u00edku, za jeho\u017e odstran\u011bn\u00ed jste pr\u00e1v\u011b zaplatili. Skladov\u00e1n\u00ed v suchu, kr\u00e1tk\u00e1 doba otev\u0159en\u00ed balen\u00ed, n\u011bkdy i povrchov\u00e1 \u00faprava. To nen\u00ed \u017e\u00e1dn\u00e1 p\u0159ecitliv\u011blost. Takto se hodnota k zachov\u00e1 a\u017e do vkl\u00e1d\u00e1n\u00ed do pece.<\/p>\n
Nitrid hlin\u00edku pou\u017e\u00edv\u00e1me tam, kde to tepeln\u00fd \u0159et\u011bzec skute\u010dn\u011b vy\u017eaduje: na v\u00fdkonov\u00fdch desk\u00e1ch DBC a DPC, v RF pouzdrech, na podlo\u017ek\u00e1ch pro lasery a LED diody a u n\u011bkter\u00fdch sou\u010d\u00e1st\u00ed polovodi\u010dov\u00fdch proces\u016f. Pokud m\u00e1 \u010dip v\u00fdkon jen n\u011bkolik watt\u016f a \u00fazk\u00fdm hrdlem je chladi\u010d, z cenov\u00e9ho hlediska st\u00e1le v\u00edt\u011bz\u00ed oxid hlinit\u00fd. Pokud odv\u00e1d\u00edte des\u00edtky watt\u016f p\u0159es tenkou keramiku do m\u011bdi, pokles teploty na substr\u00e1tu z oxidu hlinit\u00e9ho ji\u017e nen\u00ed bez n\u00e1klad\u016f. Keramika stoj\u00ed v\u00edce. V\u00fdhodou je modul, kter\u00fd se nepre\u0165a\u017euje ani se nerozvrstv\u00ed.<\/p>\n
Obr\u00e1b\u011bn\u00ed i metalizace vy\u017eaduj\u00ed stejnou pe\u010dlivost. AlN nen\u00ed tak nen\u00e1ro\u010dn\u00fd materi\u00e1l jako oxid hlinit\u00fd 96%. Na hran\u00e1ch doch\u00e1z\u00ed k od\u0161t\u00edp\u00e1v\u00e1n\u00ed. M\u011bd\u011bn\u00e9 spoje mus\u00ed zohlednit tepelnou rozta\u017enost. Kr\u00e1sn\u00fd disk s tepelnou vodivost\u00ed 180 W\/m\u00b7K, kter\u00fd m\u00e1 v\u0161ak nekvalitn\u00ed rozhran\u00ed, je pouh\u00fdm drah\u00fdm izol\u00e1torem. Specifikujte spole\u010dn\u011b koeficient k, tlou\u0161\u0165ku, povrch a syst\u00e9m kov\u016f. Nitrid hlin\u00edku je tepeln\u00e1 cesta, kter\u00e1 n\u00e1hodou m\u00e1 keramickou podobu. Pokud s n\u00edm budete zach\u00e1zet t\u00edmto zp\u016fsobem, zaslou\u017e\u00ed si svou pr\u00e9mii. Pokud s n\u00edm budete zach\u00e1zet jako s b\u00edl\u00fdm oxidem hlinit\u00fdm s lep\u0161\u00edm prospektem, nezaslou\u017e\u00ed si ji.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminium Nitride Moves Heat Like a Metal and Still Blocks Current Alumina is the default ceramic substrate for a reason. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[2],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-products-related"],"_links":{"self":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/74","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/comments?post=74"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":77,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/74\/revisions\/77"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/media?parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/categories?post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/tags?post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}