{"id":79,"date":"2026-10-25T21:16:01","date_gmt":"2026-10-25T13:16:01","guid":{"rendered":"https:\/\/aluminiumnitride.com\/?p=79"},"modified":"2026-10-25T21:16:01","modified_gmt":"2026-10-25T13:16:01","slug":"proc-pouzdra-z-nitridu-hliniku-ztraceji-schopnost-rozptylovat-teplo-po-vystaveni-vlhkosti","status":"publish","type":"post","link":"https:\/\/aluminiumnitride.com\/cs\/proc-pouzdra-z-nitridu-hliniku-ztraceji-schopnost-rozptylovat-teplo-po-vystaveni-vlhkosti\/","title":{"rendered":"Pro\u010d pouzdra z nitridu hlin\u00edku ztr\u00e1cej\u00ed schopnost rozptylovat teplo po vystaven\u00ed vlhkosti"},"content":{"rendered":"<p dir=\"auto\"><strong>Pro\u010d pouzdra z nitridu hlin\u00edku ztr\u00e1cej\u00ed schopnost rozptylovat teplo po vystaven\u00ed vlhkosti<\/strong><\/p>\n<p dir=\"auto\">Po dvan\u00e1cti letech pr\u00e1ce se substr\u00e1ty z nitridu hlin\u00edku v v\u00fdkonov\u00fdch a vysokofrekven\u010dn\u00edch pouzdrech se jako p\u0159etrv\u00e1vaj\u00edc\u00ed probl\u00e9m jev\u00ed postupn\u00fd n\u00e1r\u016fst nam\u011b\u0159en\u00e9ho tepeln\u00e9ho odporu pot\u00e9, co byla za\u0159\u00edzen\u00ed skladov\u00e1na nebo provozov\u00e1na ve vlhk\u00e9m prost\u0159ed\u00ed. Tento n\u00e1r\u016fst nelze vysv\u011btlit pouze \u00fanavou p\u00e1jky nebo kontaktem s chladi\u010dem. Nitrid hlin\u00edku reaguje s vlhkost\u00ed a produkty t\u00e9to reakce mohou zv\u00fd\u0161it tepeln\u00e9 hrani\u010dn\u00ed odpor na voln\u00fdch povr\u0161\u00edch a na rozhran\u00edch, i kdy\u017e objemov\u00e1 vodivost keramiky z\u016fst\u00e1v\u00e1 vysok\u00e1.<\/p>\n<p dir=\"auto\"><!--more--><\/p>\n<p dir=\"auto\">Hust\u00fd AlN je relativn\u011b stabiln\u00ed, av\u0161ak zbytkov\u00e1 otev\u0159en\u00e1 p\u00f3rovitost nebo ne\u00fapln\u011b slinut\u00e9 hranice zrn umo\u017e\u0148uj\u00ed vodn\u00ed p\u00e1\u0159e proniknout k reaktivn\u00edm povrch\u016fm. P\u0159i t\u00e9to reakci vznikaj\u00ed hydroxidy hlin\u00edku a amoniak; vrstva hydroxidu je \u0161patn\u00fdm tepeln\u00fdm vodi\u010dem a m\u016f\u017ee tak\u00e9 naru\u0161it p\u0159ilnavost n\u00e1sledn\u00e9 metalizace. Na pr\u00e1\u0161ku nebo materi\u00e1lu s n\u00edzkou hustotou prob\u00edh\u00e1 reakce rychle. Na pln\u011b hust\u00fdch podkladech je tento jev pomalej\u0161\u00ed a lokalizovan\u00fd, av\u0161ak st\u00e1le m\u011b\u0159iteln\u00fd i po t\u00fddnech vystaven\u00ed relativn\u00ed vlhkosti nad 60 %. Jeliko\u017e tepeln\u00fd odpor obalu je sou\u010dtem objemov\u00e9ho veden\u00ed a odpor\u016f na rozhran\u00ed, m\u016f\u017ee i tenk\u00e1 reak\u010dn\u00ed vrstva o tlou\u0161\u0165ce n\u011bkolika mikrometr\u016f p\u0159idat p\u0159i vysok\u00e9m tepeln\u00e9m toku n\u011bkolik desetin stupn\u011b na watt.<\/p>\n<p dir=\"auto\">V r\u00e1mci kontrolovan\u00e9ho testu vystaven\u00ed vliv\u016fm prost\u0159ed\u00ed byly substr\u00e1ty z AlN o tlou\u0161\u0165ce 0,5 mm s nam\u011b\u0159enou objemovou vodivost\u00ed 185 W\/m\u00b7K pokoveny a sestaveny do v\u00fdkonov\u00fdch modul\u016f. Polovina modul\u016f byla skladov\u00e1na po dobu 500 hodin p\u0159i teplot\u011b 85 \u00b0C a relativn\u00ed vlhkosti 85 %; druh\u00e1 polovina byla udr\u017eov\u00e1na p\u0159i stejn\u00e9 teplot\u011b v such\u00e9m dus\u00edku. Po expozici se tepeln\u00fd odpor mezi p\u0159echodem a pouzdrem p\u0159i z\u00e1t\u011b\u017ei 40 W zv\u00fd\u0161il o 0,18 \u00b0C\/W u modul\u016f skladovan\u00fdch ve vlhk\u00e9m prost\u0159ed\u00ed, zat\u00edmco u modul\u016f skladovan\u00fdch v suchu z\u016fstal nezm\u011bn\u011bn. Pr\u016f\u0159ezy uk\u00e1zaly u vzork\u016f skladovan\u00fdch ve vlhk\u00e9m prost\u0159ed\u00ed nesouvislou povrchovou vrstvu o tlou\u0161\u0165ce p\u0159ibli\u017en\u011b 2\u20134 \u00b5m. M\u011b\u0159en\u00ed metodou laserov\u00e9ho z\u00e1blesku na doprovodn\u00fdch nemetalizovan\u00fdch vzorc\u00edch potvrdila, \u017ee objemov\u00e1 vodivost z\u016fstala nezm\u011bn\u011bna, \u010d\u00edm\u017e byl p\u0159idan\u00fd odpor p\u0159i\u0159azen povrchov\u00fdm reak\u010dn\u00edm produkt\u016fm. Moduly, kter\u00e9 byly slinuty na vy\u0161\u0161\u00ed hustotu (otev\u0159en\u00e1 p\u00f3rovitost pod 0,2 %), vykazovaly p\u0159i stejn\u00e9m vystaven\u00ed vlhkosti p\u0159ibli\u017en\u011b polovi\u010dn\u00ed n\u00e1r\u016fst odporu.<\/p>\n<p dir=\"auto\">Praktick\u00fdmi opat\u0159en\u00edmi jsou tedy zhutn\u011bn\u00ed a ochrana povrchu. Zbytkov\u00e1 p\u00f3rovitost mus\u00ed b\u00fdt natolik n\u00edzk\u00e1, aby vlhkost nemohla proniknout do vnit\u0159ku zrn; tenk\u00e1, souvisl\u00e1 ochrann\u00e1 vrstva nebo metalizace, kter\u00e1 zcela pokr\u00fdv\u00e1 voln\u00e9 povrchy, d\u00e1le omezuje reakci. Pokud jde o citlivost nitridu hlin\u00edku na vlhkost p\u0159i hydrol\u00fdze, jsou relevantn\u00edmi procesn\u00edmi prom\u011bnn\u00fdmi hustota slinov\u00e1n\u00ed, zbytkov\u00e1 otev\u0159en\u00e1 p\u00f3rovitost a neporu\u0161enost p\u0159\u00edpadn\u00e9 n\u00e1sledn\u00e9 vrstvy. Spolehlivost substr\u00e1t\u016f AlN p\u0159i teplotn\u00edch cyklech ve vlhk\u00fdch podm\u00ednk\u00e1ch se potvrzuje m\u011b\u0159en\u00edm tepeln\u00e9ho odporu obalu p\u0159ed a po zrychlen\u00e9 expozici vlhkosti, nikoli pouze na z\u00e1klad\u011b objemov\u00e9 vodivosti. Pokud po skladov\u00e1n\u00ed nebo expozici ve vlhk\u00e9m ovzdu\u0161\u00ed dojde ke zv\u00fd\u0161en\u00ed tepeln\u00e9ho odporu, rozhoduj\u00edc\u00edm d\u016fkazem je n\u00e1r\u016fst odporu na rozhran\u00ed bez zm\u011bny objemov\u00e9 vodivosti. Dosa\u017een\u00ed t\u00e9m\u011b\u0159 pln\u00e9 hustoty a ochrana voln\u00fdch povrch\u016f, jak dokl\u00e1d\u00e1 men\u0161\u00ed n\u00e1r\u016fst odporu u substr\u00e1t\u016f s vy\u0161\u0161\u00ed hustotou v testu p\u0159i 85 \u00b0C \/ 85 % RH, omezuje degradaci zp\u016fsobenou vlhkost\u00ed a zachov\u00e1v\u00e1 schopnost rozvodu tepla nitridu hlin\u00edku.<\/p>","protected":false},"excerpt":{"rendered":"<p>Why Aluminium Nitride Packages Lose Heat-Spreading Ability After Humid Exposure After twelve years working with aluminium nitride substrates in power [&hellip;]<\/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-79","post","type-post","status-publish","format-standard","hentry","category-products-related"],"_links":{"self":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/79","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=79"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/posts\/79\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/cs\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}