{"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-paketi-od-aluminijevog-nitrida-gube-sposobnost-rasprsivanja-topline-nakon-izlaganja-vlazi","status":"publish","type":"post","link":"https:\/\/aluminiumnitride.com\/hr\/zasto-paketi-od-aluminijevog-nitrida-gube-sposobnost-rasprsivanja-topline-nakon-izlaganja-vlazi\/","title":{"rendered":"Za\u0161to paketi od aluminijevog nitrida gube sposobnost rasipanja topline nakon izlaganja vlazi"},"content":{"rendered":"<p dir=\"auto\"><strong>Za\u0161to paketi od aluminijevog nitrida gube sposobnost rasipanja topline nakon izlaganja vlazi<\/strong><\/p>\n<p dir=\"auto\">Nakon dvanaest godina rada sa supstratima od aluminijevog nitrida u snagovim i RF paketima, jedan uporan problem je postupno pove\u0107anje izmjerene toplinske otpornosti nakon \u0161to su ure\u0111aji skladi\u0161teni ili radili u vla\u017enim uvjetima. To pove\u0107anje nije obja\u0161njeno samo zamorom lemljenja ili kontaktom s hladnjakom. Nitrid aluminija reagira s vlagom, a produkti te reakcije mogu pove\u0107ati termi\u010dku kontaktnu otpornost na slobodnim povr\u0161inama i na su\u010delima, \u010dak i kada ostaje visoka volumenska provodnost keramike.<\/p>\n<p dir=\"auto\"><!--more--><\/p>\n<p dir=\"auto\">Gusti AlN je relativno stabilan, no preostala otvorena poroznost ili nepotpuno sinterirane me\u0111e zrna omogu\u0107uju vodenim parama da dosegnu reaktivne povr\u0161ine. Reakcija stvara aluminijeve hidrokside i amonijak; sloj hidroksida je lo\u0161 toplinski provodnik i mo\u017ee naru\u0161iti prianjanje naknadne metalizacije. Na prahu ili materijalu niske gusto\u0107e reakcija je brza. Na potpuno gustoj podlozi u\u010dinak je sporiji i lokaliziran, no i dalje mjerljiv nakon tjedana izlo\u017eenosti relativnoj vla\u017enosti iznad 60 %. Budu\u0107i da je toplinska otpornost pakiranja zbroj otpora masene provodnosti i su\u010delja, \u010dak i tanki sloj reaktivnog materijala debljine nekoliko mikrometara mo\u017ee pove\u0107ati temperaturu za nekoliko desetina stupnjeva po vatu pri velikom toplinskom 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 pohranjivana je 500 sati na 85 \u00b0C i 85 % relativne vla\u017enosti; druga polovica dr\u017eana je na istoj temperaturi u suhom du\u0161iku. Nakon izlaganja, toplinska otpornost spoj-ku\u0107i\u0161te pri optere\u0107enju od 40 W porasla je za 0,18 \u00b0C\/W na modulima skladi\u0161tenim u vla\u017enim uvjetima, dok je ostala nepromijenjena na modulima skladi\u0161tenim na suhom. Presjeci su pokazali diskontinuirani povr\u0161inski sloj debljine otprilike 2\u20134 \u00b5m na vla\u017enim uzorcima. Mjerenja laser-flash metodom na pripadaju\u0107im nemetaliziranim uzorcima potvrdila su da se volumenska provodnost nije promijenila, \u010dime se potvr\u0111uje da je pove\u0107anje otpora posljedica povr\u0161inskih produkata reakcije. Moduli koji su sinterirani do ve\u0107e gusto\u0107e (otvorena poroznost ispod 0,2 %) pokazali su otprilike upola manji porast otpora pri istoj izlo\u017eenosti vlazi.<\/p>\n<p dir=\"auto\">Prakti\u010dne kontrole su stoga zbijanje i za\u0161tita povr\u0161ine. 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 aluminijevog nitrida, relevantne varijable procesa su gusto\u0107a sinteriranja, preostala otvorena poroznost i integritet eventualnog naknadnog sloja. Pouzdanost termi\u010dkog cikliranja AlN podloge u vla\u017enim uvjetima potvr\u0111uje se mjerenjem toplinske otpornosti paketa prije i nakon ubrzane izlo\u017eenosti vlazi, a ne samo vodljivo\u0161\u0107u u masi. Kada se toplinska otpornost pove\u0107a nakon skladi\u0161tenja ili izlo\u017eenosti na terenu u vla\u017enom zraku, odlu\u010duju\u0107i dokaz je pove\u0107anje otpornosti na su\u010delju bez promjene vodljivosti u masi. Postizanje gotovo pune gusto\u0107e i za\u0161tita slobodnih povr\u0161ina, \u0161to se dokazuje manjim porastom otpora na podlogama ve\u0107e gusto\u0107e u ispitivanju pri 85 \u00b0C \/ 85 % RH, ograni\u010dava degradaciju uzrokovanu vlagom i o\u010duvava performanse raspr\u0161ivanja topline 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\/hr\/wp-json\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/posts\/79\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/hr\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}