Mtundu wofananira wa Sn96.5Ag3.0Cu0.5 aloyi wachikhalidwe wopanda kutsogolo wopanda reflow wokhotakhota wa kutentha.A ndi malo otenthetsera, B ndi malo otentha osasintha (malo onyowetsa), ndipo C ndi malo osungunuka malata.Pambuyo pa 260S ndi malo ozizira.
Sn96.5Ag3.0Cu0.5 aloyi yachikhalidwe yopanda kutsogolo yopanda kutulutsa kutentha yokhotakhota
Cholinga cha Kutenthetsa Zone A ndikutenthetsa mwachangu bolodi la PCB mpaka kutentha koyambitsa kutentha.Kutentha kumakwera kuchokera ku firiji kufika pafupifupi 150 ° C pafupifupi masekondi 45-60, ndipo otsetsereka ayenera kukhala pakati pa 1 ndi 3. Ngati kutentha kumakwera mofulumira kwambiri, kumatha kugwa ndi kubweretsa zolakwika monga solder mikanda ndi bridging.
Kutentha kokhazikika kwa zone B, kutentha kumakwera pang'onopang'ono kuchoka pa 150 ° C mpaka 190 ° C.Nthawiyi imachokera ku zofunikira zenizeni za mankhwala ndipo imayendetsedwa pa masekondi pafupifupi 60 mpaka 120 kuti apereke masewera athunthu ku ntchito ya zosungunulira zosungunulira ndikuchotsa ma oxides pamtunda.Ngati nthawi yayitali kwambiri, kuyatsa kopitilira muyeso kumatha kuchitika, zomwe zimakhudza mtundu wa kuwotcherera.Panthawi imeneyi, chosungunulira chosungunulira chotuluka chimayamba kugwira ntchito, ndipo utomoni wa rosin umayamba kufewetsa ndikuyenda.Wogwira ntchitoyo amagawanitsa ndikulowa ndi rosin resin pa PCB pad ndi kumapeto kwa gawolo, ndipo amalumikizana ndi okusayidi pamwamba pa pad ndi gawo la soldering pamwamba.Kuchitapo kanthu, kuyeretsa pamwamba kuti atsekedwe ndikuchotsa zonyansa.Panthawi imodzimodziyo, utomoni wa rosin umakula mofulumira kuti ukhale filimu yotetezera pamtunda wakunja wa kuwotcherera pamwamba ndikuulekanitsa kuti usagwirizane ndi mpweya wakunja, kuteteza kuwotcherera pamwamba ku okosijeni.Cholinga chokhazikitsa nthawi yokwanira yotentha nthawi zonse ndikulola kuti PCB pad ndi magawowo afikire kutentha komweko musanayambe kutulutsanso kutentha ndi kuchepetsa kusiyana kwa kutentha, chifukwa mayamwidwe a kutentha kwa magawo osiyanasiyana okwera pa PCB ndi osiyana kwambiri.Kupewa mavuto khalidwe chifukwa kutentha kutentha pa reflows, monga tombstones, soldering zabodza, etc. Ngati nthawi zonse kutentha zone kutentha mofulumira kwambiri, flux mu solder phala adzakhala mofulumira kukula ndi volatilize, kuchititsa mavuto osiyanasiyana khalidwe monga pores, kuwomberedwa. malata, ndi mikanda ya malata.Ngati nthawi zonse kutentha ndi yaitali kwambiri, zosungunulira flux adzakhala nthunzi mopitirira muyeso ndi kutaya ntchito yake ndi chitetezo ntchito pa reflow soldering, kumabweretsa mndandanda wa zotsatira zoipa monga pafupifupi soldering, wakuda solder olowa zotsalira, ndi kuzimiririka solder mfundo.Pakupanga kwenikweni, nthawi yotentha yokhazikika iyenera kukhazikitsidwa molingana ndi mawonekedwe a chinthu chenichenicho komanso phala lopanda solder.
Nthawi yoyenera ya soldering zone C ndi 30 mpaka 60 masekondi.Kufupikitsa nthawi yosungunuka ya malata kungayambitse zolakwika monga kusungunula kofooka, pamene nthawi yayitali ingayambitse chitsulo chowonjezera cha dielectric kapena kuchititsa mdima wa solder.Panthawi imeneyi, ufa wa alloy mu solder phala umasungunuka ndikuchitapo kanthu ndi chitsulo pamtunda wogulitsidwa.The flux zosungunulira zithupsa pa nthawi ino ndi Iyamba Kuthamanga volatilization ndi kulowa mkati, ndi kugonjetsa mavuto padziko pa kutentha, kulola madzi aloyi solder kuyenda ndi flux, kufalikira padziko PAD ndi kukulunga soldering mapeto pamwamba pa gawo kupanga. kunyowetsa zotsatira.Mwachidziwitso, kutentha kwapamwamba, kumapangitsanso kunyowetsa bwino.Komabe, mu ntchito zothandiza, pazipita kutentha kulolerana kwa bolodi PCB ndi mbali ayenera kuganiziridwa.Kusintha kwa kutentha ndi nthawi ya reflow soldering zone ndikuyang'ana kulinganiza pakati pa kutentha kwapamwamba ndi zotsatira za soldering, ndiko kuti, kukwaniritsa khalidwe labwino la soldering mkati mwa kutentha kwapamwamba kovomerezeka ndi nthawi.
Pambuyo kuwotcherera zone ndi kuzirala zone.Munthawi imeneyi, solder imazizira kuchokera kumadzi kupita ku olimba kupanga zolumikizana, ndipo njere za kristalo zimapangidwa mkati mwa zolumikizira za solder.Kuzizira kofulumira kumatha kupanga zolumikizana zodalirika za solder zokhala ndi gloss yowala.Izi zili choncho chifukwa kuzizira kofulumira kungapangitse kuti ophatikizana a solder akhale aloyi ndi dongosolo lolimba, pamene kuzizira pang'onopang'ono kumatulutsa kuchuluka kwa intermetal ndikupanga njere zazikulu pamtunda.Kudalirika kwa mphamvu yamakina a mgwirizano woterewu ndi wochepa, ndipo Pamwamba pa mgwirizano wa solder udzakhala wakuda komanso wochepa kwambiri.
Kukhazikitsa kutentha kwa solder wopanda lead
Munjira yowotchera yopanda kutsogolera, ng'anjo ya ng'anjo iyenera kukonzedwa kuchokera ku pepala lonse lachitsulo.Ngati ng'anjo ya ng'anjo imapangidwa ndi zidutswa zing'onozing'ono zazitsulo zachitsulo, kuphulika kwa ng'anjo ya ng'anjo kudzachitika mosavuta pansi pa kutentha kopanda kutsogolera.Ndikofunika kwambiri kuyesa kufanana kwa njanji pa kutentha kochepa.Ngati njanjiyo ndi yopunduka pa kutentha kwambiri chifukwa cha zipangizo ndi mapangidwe, kupanikizana ndi kugwa kwa bolodi sizingalephereke.M'mbuyomu, Sn63Pb37 lead solder inali solder wamba.Ma crystalline alloys ali ndi malo osungunuka omwewo komanso kutentha kwa malo ozizira, onse 183 ° C.Cholumikizira chosatsogolera chosatsogolera cha SnAgCu sichinthu cha eutectic alloy.Malo ake osungunuka ndi 217 ° C-221 ° C.Kutentha kumakhala kolimba pamene kutentha kuli kochepa kuposa 217 ° C, ndipo kutentha kumakhala kwamadzimadzi pamene kutentha kuli pamwamba pa 221 ° C.Pamene kutentha kuli pakati pa 217 ° C ndi 221 ° C The alloy amasonyeza kusakhazikika.
Nthawi yotumiza: Nov-27-2023