{"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":"miks-alumiiniumnitriidist-korpused-kaotavad-soojuse-hajutamise-voime-parast-kokkupuudet-niiskusega","status":"publish","type":"post","link":"https:\/\/aluminiumnitride.com\/et\/miks-alumiiniumnitriidist-korpused-kaotavad-soojuse-hajutamise-voime-parast-kokkupuudet-niiskusega\/","title":{"rendered":"Miks kaotavad alumiiniumnitriidist korpused niiskusele kokkupuutumise j\u00e4rel soojuse hajutamise v\u00f5ime?"},"content":{"rendered":"<p dir=\"auto\"><strong>Miks kaotavad alumiiniumnitriidist korpused niiskusele kokkupuutumise j\u00e4rel soojuse hajutamise v\u00f5ime?<\/strong><\/p>\n<p dir=\"auto\">P\u00e4rast kaheteistk\u00fcmne aasta pikkust t\u00f6\u00f6d alumiiniumnitriidist alusplaatidega v\u00f5imsus- ja RF-pakettides on \u00fcks p\u00fcsiv probleem m\u00f5\u00f5detud soojustakistuse j\u00e4rkj\u00e4rguline suurenemine p\u00e4rast seadmete ladustamist v\u00f5i kasutamist niiskes keskkonnas. Seda suurenemist ei saa seletada \u00fcksnes jootmise v\u00e4simusega ega jahutusradiaatori kontaktiga. Alumiiniumnitriid reageerib niiskusega ning reaktsioonisaadused v\u00f5ivad suurendada soojuspiirkonna takistust vabadel pindadel ja liidestel isegi siis, kui keraamika mahujuhtivus j\u00e4\u00e4b k\u00f5rgeks.<\/p>\n<p dir=\"auto\"><!--more--><\/p>\n<p dir=\"auto\">Tihe AlN on suhteliselt stabiilne, kuid j\u00e4relej\u00e4\u00e4nud avatud poorsus v\u00f5i ebat\u00e4ielikult paagutatud tera piirid v\u00f5imaldavad veeaurul j\u00f5uda reaktiivsetele pindadele. Reaktsiooni tulemusena tekivad alumiiniumh\u00fcdroksiidid ja ammoniaak; h\u00fcdroksiidikihi soojusjuhtivus on halb ning see v\u00f5ib h\u00e4irida ka j\u00e4rgneva metalliseerimise haardumist. Pulbril v\u00f5i madala tihedusega materjalil kulgeb reaktsioon kiiresti. T\u00e4ielikult tihedatel alusmaterjalidel on see protsess aeglasem ja piiratud, kuid siiski m\u00f5\u00f5detav isegi p\u00e4rast n\u00e4dalaid kestnud kokkupuudet \u00fcle 60 % suhtelise niiskusega. Kuna pakendi soojustakistus on mahu soojusjuhtivuse ja liidestakistuste summa, v\u00f5ib isegi m\u00f5ne mikromeetri paksune reaktsioonikiht suurendada soojusvoo korral soojustakistust mitme k\u00fcmnendkraadi v\u00f5rra vati kohta.<\/p>\n<p dir=\"auto\">Kontrollitud kokkupuute katses metalliseeriti 0,5 mm paksused AlN-substraatid, mille m\u00f5\u00f5detud mahujuhtivus oli 185 W\/m\u00b7K, ning need monteeriti v\u00f5imsusmoodulitesse. Pool moodulitest hoiti 500 tundi temperatuuril 85 \u00b0C ja suhtelise niiskuse juures 85 %; teine pool hoiti samal temperatuuril kuivas l\u00e4mmastikus. P\u00e4rast kokkupuudet t\u00f5usis 40 W koormuse juures \u00fclemineku-korpuse soojustakistus niiskes keskkonnas hoitud moodulitel 0,18 \u00b0C\/W v\u00f5rra, samas kui kuivas keskkonnas hoitud moodulitel j\u00e4i see muutumatuks. Ristl\u00f5iked n\u00e4itasid niisketes proovides umbes 2\u20134 \u00b5m paksust katkendlikku pinnakihti. Laser-flash-m\u00f5\u00f5tmised metallimata t\u00fchimudelitel kinnitasid, et materjali juhtivus oli muutumatu, mis v\u00f5imaldas eristada lisandunud takistust pinnareaktsiooni saadustest. Moodulid, mis olid paagutatud suurema tiheduseni (avatud poorsus alla 0,2 %), n\u00e4itasid sama niiskusele eksponeerimise korral ligikaudu poole v\u00e4iksemat takistuse suurenemist.<\/p>\n<p dir=\"auto\">Seet\u00f5ttu on praktilised meetmed tiheduse suurendamine ja pinna kaitse. J\u00e4\u00e4kpoorsus peab olema piisavalt madal, et niiskus ei p\u00e4\u00e4seks terade sisemusse; \u00f5huke, katkematu kaitsekiht v\u00f5i metalliseerimine, mis katab vabad pinnad t\u00e4ielikult, piirab reaktsiooni veelgi. Alumiiniumnitriidi h\u00fcdrol\u00fc\u00fcsi niiskustundlikkuse puhul on asjakohased protsessimuutujad paagutustihedus, j\u00e4\u00e4kpoorsus ja mis tahes j\u00e4rgneva kattekihi terviklikkus. AlN-substraadi termots\u00fcklite t\u00f6\u00f6kindlus niisketes tingimustes kinnitatakse, m\u00f5\u00f5tes pakendi soojustakistust enne ja p\u00e4rast kiirendatud niiskusele eksponeerimist, mitte ainult mahujuhivuse p\u00f5hjal. Kui soojustakistus t\u00f5useb p\u00e4rast ladustamist v\u00f5i kasutamist niiskes \u00f5hus, on eristavaks tunnuseks liidese takistuse suurenemine, ilma et mahujuhivus muutuks. Peaaegu t\u00e4ieliku tiheduse saavutamine ja vabade pindade kaitsmine \u2013 mida n\u00e4itab v\u00e4iksem takistuse t\u00f5us suurema tihedusega substraatidel 85 \u00b0C \/ 85 % RH katses \u2013 piirab niiskusest tingitud lagunemist ja s\u00e4ilitab alumiiniumnitriidi soojuse levitamise v\u00f5ime.<\/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\/et\/wp-json\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":1,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/posts\/79\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiumnitride.com\/et\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}