{"id":534,"date":"2016-03-28T15:26:56","date_gmt":"2016-03-28T12:26:56","guid":{"rendered":"http:\/\/reparatii-laptopuri.ro\/?p=534"},"modified":"2016-03-31T09:27:00","modified_gmt":"2016-03-31T06:27:00","slug":"reflow-vs-reball","status":"publish","type":"post","link":"https:\/\/reparatii-laptopuri.ro\/?p=534","title":{"rendered":"Reflow   vs    Reball"},"content":{"rendered":"<h4>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Reflow vs Reball<\/h4>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Reflow si reball sunt doua din metodele folosite in reparatiile placilor de baza atunci cand defectele provin de la chipuri dezlipite, \u00a0ce nasc controverse si polemici intre electronistii level 4, \u00a0de multe ori \u00a0din \u00a0necunostinta de cauza. De aceea voi incerca sa prezint succint \u00a0fenomenele ce se produc in \u00a0materialele de lipire BGA.<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0In tehnologia BGA (Ball Grid Array), folosita in mod curent in laptopuri, contactul intre pad-urile de pe chip si cele de pe placa se face prin bile din aliaje de Sn (SnPb, SnCu, SnAgCu). Trebuie inteles ca o astfel de conexiune intre metale diferite nu este &#8222;batuta in cuie&#8221; ci evolueaza in timp, au loc o serie de fenomene care duc la imbatranirea si in cele din urma cedarea lipiturii.<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Chiar si in stare solida, in zona de contact intre metale diferite are loc difuzia. Simplist spus, atomii unui material &#8222;migreaza&#8221; printre atomii celuilat, in urma ramanand locuri goale. In timp gaurile din structura se maresc, se unesc si formeaza pori si goluri macroscopice care evident afecteaza rezistenta mecanica a lipiturii.<\/p>\n<p><a href=\"http:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/Untitled.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\" size-medium wp-image-535 aligncenter\" src=\"http:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/Untitled-300x187.png\" alt=\"Untitled\" width=\"300\" height=\"187\" srcset=\"https:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/Untitled-300x187.png 300w, https:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/Untitled.png 689w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0In cazul de fata difuzia Cu in Sn este mult mai pronuntata decat in sens invers. Mai intai la lipire se produce difuzia atomilor de Cu de la suprafata pad-urilor in bila de Sn lichid, formand un strat microscopic CuSn. In timp acest strat creste si da nastere golurilor la interfata dintre bila si pad, cat si unor incluziuni CuSn in structura bilei (pentru cei mai curiosi, este vorba de efectul<a href=\"https:\/\/en.wikipedia.org\/wiki\/Kirkendall_effect\" target=\"_blank\"> Kirkendall<\/a>).<br \/> Un alt tip de imperfectiuni sunt generate de impuritatile din compozitia aliajului.<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0De-a lungul vietii bila este supusa la multiple cicluri termice. Cand laptopul este pornit chipul respectiv se incinge, cand este oprit se raceste. La fiecare ciclu incins-racit materialele diferite din componenta chipului si a lipiturii se vor dilata si contracta diferit, astfel bila este supusa unui stres mecanic permanent (ca si cum am indoi repetat o bucata de metal, pana se rupe). Intre golurile despre care am vorbit, pot aparea fracturi microscopice care in timp se unesc si reduc si mai mult rezistenta bilelor. Intr-un final unele bile cedeaza si se fractureaza complet. Rezulta un chip &#8222;desprins&#8221; si un laptop defect. In practica, bilele de 0,6-0,3 mm folosite in mod curent rezista aprox. 1000 de cicluri (numar atins in medie in 2-3 ani de functionare).<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Un simplu &#8222;reflow&#8221;, adica incalzirea chipului pana la lichefierea bilelor , fie nu reuseste deloc, fie nu rezolva complet defectele microscopice din structura acestora. In nici un caz \u00a0nu se foloseste \u00a0o curba de temperatura 2 min la 400 grade celsius cu am citit pe unele forumuri, sau incalziri necontrolate, \u00a0tinand cont ca temperaturile de lichefiere ale bilelor \u00a0Sn63Pb37 \u00a0sunt de 185 grade iar Sn96,5Ag3Cu0,5 de 235 de grade.<a href=\"http:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/DSC_0994.jpg\"><img decoding=\"async\" class=\"alignright wp-image-536 size-medium\" src=\"http:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/DSC_0994-300x199.jpg\" alt=\"reflow vs reball\" width=\"300\" height=\"199\" srcset=\"https:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/DSC_0994-300x199.jpg 300w, https:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/DSC_0994-1024x678.jpg 1024w, https:\/\/reparatii-laptopuri.ro\/wp-content\/uploads\/2016\/03\/DSC_0994.jpg 2048w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Bilele fracturate se pot relipi partial, insa o parte din goluri raman, ca si straturile CuSn dintre bila si pad-uri sau impuritatile si incluziunile de CuSn din interiorul bilei. Se poate spune ca dupa un reflow bilele ies direct &#8222;imbatranite&#8221;.<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Rezultatul este o lipitura aparent functionala, pe bani putini, dar cu o durata de viata mult redusa.<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Alternativa este procedura de reball. Chipul se desprinde de pe placa, se elimina bilele, se curata pad-urile, se pun bile noi cu compozitia metalica intacta \u00a0apoi chipul este relipit pe placa. Presupunand ca chipul in sine este inca bun,din cauza ciclurilor repetate de incalzire racire \u00a0traseele \u00a0chipului se pot intrerupe intre straturi, un reball executat corect are sanse mult mai mari de succes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Reflow vs Reball \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Reflow si reball sunt doua din metodele folosite in reparatiile placilor de baza atunci cand defectele provin de la chipuri dezlipite, \u00a0ce nasc controverse si polemici intre electronistii level 4, \u00a0de multe [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - 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