{"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":"waarom-aluminiumnitriedverpakkings-hul-hitteverspreidingsvermoe-verloor-na-blootstelling-aan-vog","status":"publish","type":"post","link":"https:\/\/aluminiumnitride.com\/af\/waarom-aluminiumnitriedverpakkings-hul-hitteverspreidingsvermoe-verloor-na-blootstelling-aan-vog\/","title":{"rendered":"Waarom aluminiumnitriedverpakkings hul hitteverspreidingsvermo\u00eb verloor na blootstelling aan vog"},"content":{"rendered":"<p dir=\"auto\"><strong>Waarom aluminiumnitriedverpakkings hul hitteverspreidingsvermo\u00eb verloor na blootstelling aan vog<\/strong><\/p>\n<p dir=\"auto\">Na twaalf jaar se werk met aluminiumnitriedsubstrate in krag- en RF-pakkette is 'n aanhoudende probleem 'n geleidelike styging in die gemeete termiese weerstand nadat toestelle in vogtige omgewings gestoor of bedryf is. Die styging word nie deur lodenmoegheid of hittevlerkontak alleenlik verklaar nie. Aluminiumnitried reageer met vog, en die reaksieprodukte kan die termiese grensweerstand op vrye oppervlaktes en by koppelvlakke verhoog, selfs wanneer die massale geleidbaarheid van die keramiek hoog bly.<\/p>\n<p dir=\"auto\"><!--more--><\/p>\n<p dir=\"auto\">Digte AlN is relatief stabiel, maar oorblywende oop porositeit of onvolledig gesinterde korrelgrense laat waterdamp toe om reaktiewe oppervlaktes te bereik. Die reaksie produseer aluminiumhidroksiede en ammoniak; die hidroksiedlaag is 'n swak termiese geleier en kan ook die adhesie van daaropvolgende metallisering ontwrig. Op poeier of laedigtheidmateriaal is die reaksie vinnig. Op heeltemal digte substraate is die effek stadiger en gelokaliseer, maar steeds meetbaar na weke van blootstelling bo 60 % relatiewe vogtigheid. Omdat die verpakking se termiese weerstand die som is van die massale geleiding en die koppelvlakweerstande, kan selfs 'n dun reaksielaag van 'n paar mikrometers by ho\u00eb hittevloei 'n paar desimale grade per watt byvoeg.<\/p>\n<p dir=\"auto\">In 'n beheerde blootstellingsproef is 0,5 mm AlN-substrate met 'n gemeete massa-geleidbaarheid van 185 W\/m\u00b7K gemetalliseer en in kragmodules saamgestel. Die helfte van die modules is vir 500 uur by 85 \u00b0C en 85 % relatiewe vogtigheid gestoor; die ander helfte is by dieselfde temperatuur in dro\u00eb stikstof gehou. Na blootstelling het die knooppunt-tot-behuizing termiese weerstand onder 'n 40 W-lading met 0,18 \u00b0C\/W toegeneem op die vogtig-opgebergde modules, terwyl dit onveranderd gebly het op die droog-opgebergde modules. Deur-snywe\u00eb het 'n diskontinue oppervlaklaag van ongeveer 2\u20134 \u00b5m dik op die vogtige monsters getoon. Laser-flash-metings op gepaardgaande ongemetalliseerde blankes het bevestig dat die massa-geleidbaarheid onveranderd gebly het, wat die bygevoegde weerstand aan die oppervlakreaksieprodukte toeskryf. Module wat tot 'n ho\u00ebr digtheid gesinter is (oop porositeit onder 0,2 %) het ongeveer die helfte van die weerstandstoename onder dieselfde vogblootstelling getoon.<\/p>\n<p dir=\"auto\">Die praktiese beheermaatre\u00ebls is dus digmaking en oppervlakbeskerming. Residuele porositeit moet laag genoeg wees sodat vog nie die korrelinterieurs kan bereik nie; 'n dun, deurlopende beskermende laag of metallisering wat alle vrye oppervlaktes ten volle bedek, beperk die reaksie verder. Vir die vogsensitiwiteit van aluminiumnitriedhidrolise is die relevante prosesveranderlikes sinterdigtheid, residuele oop porositeit en die integriteit van enige daaropvolgende laag. Die betroubaarheid van AlN-substraat se termiese siklus in vogtige toestande word bevestig deur die pakket se termiese weerstand voor en n\u00e1 versnelde vogblootstelling te meet, eerder as deur slegs die massiewe geleidbaarheid. Wanneer die termiese weerstand n\u00e1 berging of veldblootstelling in vogtige lug styg, is die onderskeidende bewys 'n toename in koppelvlakweerstand sonder verandering in massiewe geleidbaarheid. Om byna volle digtheid te bereik en vrye oppervlaktes te beskerm, soos aangetoon deur die kleiner styging in weerstand op die ho\u00ebr-digtheid-substrate in die 85 \u00b0C \/ 85 % RH-proef, beperk vog-ge\u00efnduseerde agteruitgang en behou die hitteverspreidingsprestasie van aluminiumnitried.<\/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\/af\/wp-json\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/posts\/79\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/af\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}