{"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":"zasto-pakovanja-od-aluminijum-nitrida-gube-sposobnost-rasipanja-toplote-nakon-izlaganja-vlazi","status":"publish","type":"post","link":"https:\/\/aluminiumnitride.com\/bs\/zasto-pakovanja-od-aluminijum-nitrida-gube-sposobnost-rasipanja-toplote-nakon-izlaganja-vlazi\/","title":{"rendered":"Za\u0161to paketi od aluminij-nitrida gube sposobnost rasipanja toplote nakon izlaganja vlazi"},"content":{"rendered":"<p dir=\"auto\"><strong>Za\u0161to paketi od aluminij-nitrida gube sposobnost rasipanja toplote nakon izlaganja vlazi<\/strong><\/p>\n<p dir=\"auto\">Nakon dvanaest godina rada sa podlogama od aluminijum-nitrida u snage i RF paketima, jedan uporan problem je postepeno pove\u0107anje izmjerene toplotne otpornosti nakon \u0161to su ure\u0111aji skladi\u0161teni ili radili u vla\u017enim uslovima. Pove\u0107anje se ne mo\u017ee objasniti samo zamorom lemljenja ili kontaktom hladnjaka. Aluminijum-nitrid reaguje sa vlagom, a proizvodi te reakcije mogu pove\u0107ati termi\u010dku kontaktnu otpornost na slobodnim povr\u0161inama i na interfejsima, \u010dak i kada ostaje visoka ukupna provodnost keramike.<\/p>\n<p dir=\"auto\"><!--more--><\/p>\n<p dir=\"auto\">Gusti AlN je relativno stabilan, ali preostala otvorena poroznost ili nepotpuno sinterirane me\u0111e zrna omogu\u0107avaju vodenoj pari da dospije do reaktivnih povr\u0161ina. Reakcija proizvodi aluminijumske hidrokside i amonijak; sloj hidroksida je lo\u0161 toplotni provodnik i mo\u017ee naru\u0161iti adheziju pri naknadnoj metalizaciji. Na prahu ili materijalu niske gusto\u0107e reakcija je brza. Na potpuno gustoj podlozi efekat je sporiji i lokaliziran, ali i dalje mjerljiv nakon sedmica izlaganja relativnoj vla\u017enosti iznad 60%. Budu\u0107i da je toplotni otpor pakovanja zbir otpora masene provodnosti i otpora na me\u0111ufaznim granicama, \u010dak i tanak sloj reaktivnog sloja od nekoliko mikrometara mo\u017ee pove\u0107ati temperaturu za nekoliko desetinki stepena po vatu pri velikom toplotnom toku.<\/p>\n<p dir=\"auto\">U kontroliranom ispitivanju izlo\u017eenosti, 0,5 mm AlN podloge s izmjerenom volumenskom provodljivo\u0161\u0107u od 185 W\/m\u00b7K metalizirane su i sastavljene u snage module. Polovica modula je skladi\u0161tena 500 sati na 85 \u00b0C i 85 % relativne vla\u017enosti; druga polovica je dr\u017eana na istoj temperaturi u suhom du\u0161iku. Nakon izlaganja, toplotni otpor spoj-ku\u0107i\u0161te pri optere\u0107enju od 40 W porastao je za 0,18 \u00b0C\/W na modulima skladi\u0161tenim u vla\u017enim uslovima, dok je ostao nepromijenjen na modulima skladi\u0161tenim na suhom. Presjeci su pokazali diskontinualni povr\u0161inski sloj debljine otprilike 2\u20134 \u00b5m na vla\u017enim uzorcima. Lasersko-bljesak mjerenja na prate\u0107im nemetaliziranim uzorcima potvrdile su da se ukupna provodnost nije promijenila, \u010dime se izolirala dodatna otpornost na povr\u0161inske reakcijske proizvode. Moduli koji su sinterirani do ve\u0107e gusto\u0107e (otvorena poroznost ispod 0,2 %) pokazali su otprilike upola manji porast otpornosti pri istoj izlo\u017eenosti vlazi.<\/p>\n<p dir=\"auto\">Prakti\u010dne kontrole su stoga zbijanje i povr\u0161inska za\u0161tita. Preostala poroznost mora biti dovoljno niska da vlaga ne mo\u017ee dosegnuti unutra\u0161njost zrna; tanki, kontinuirani za\u0161titni sloj ili metalizacija koji u potpunosti pokriva slobodne povr\u0161ine dodatno ograni\u010dava reakciju. Za osjetljivost na vlagu pri hidrolizi aluminij-nitrida, relevantne procesne varijable su gusto\u0107a sinteriranja, preostala otvorena poroznost i integritet eventualnog naknadnog sloja. Pouzdanost termi\u010dkog ciklusa AlN podloge u vla\u017enim uslovima potvr\u0111uje se mjerenjem termi\u010dkog otpora paketa prije i poslije ubrzane izlo\u017eenosti vlazi, a ne samo provo\u0111eno\u0161\u0107u u masi. Kada termi\u010dki otpor poraste nakon skladi\u0161tenja ili izlo\u017eenosti na terenu u vla\u017enom zraku, odlu\u010duju\u0107i dokaz je pove\u0107anje otpora na interfejsu bez promjene provo\u0111eno\u0161\u0107u u masi. Postizanje gotovo pune gusto\u0107e i za\u0161tita slobodnih povr\u0161ina, \u0161to je dokazano manjim porastom otpora na podlogama ve\u0107e gusto\u0107e u ispitivanju pri 85 \u00b0C \/ 85 % vla\u017enosti, ograni\u010dava degradaciju izazvanu vlagom i \u010duva performanse raspr\u0161ivanja toplote nitrida aluminija.<\/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\/bs\/wp-json\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/posts\/79\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/bs\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}