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Tasirin fasahar farfajiyar farfajiyar PCB akan ingancin walda

Kula da farfajiyar PCB shine mabuɗin da tushe na ingancin facin SMT. Tsarin jiyya na wannan hanyar haɗin gwiwa ya haɗa da abubuwan da ke gaba. A yau, zan raba gogewa a cikin ƙwararrun kwamitin kewaya tare da ku:
(1) Ban da ENG, ba a kayyade kaurin farantin ba a cikin ƙa'idodin ƙasa na PC masu dacewa. Ana buƙatar kawai don biyan buƙatun ƙarfi. Gabaɗaya buƙatun masana'antar sune kamar haka.
OSP: 0.15 ~ 0.5 μm, IPC ba ta kayyade ba. An ba da shawarar yin amfani da 0.3 ~ 0.4um
EING: Ni-3 ~ 5um; Au-0.05 ~ 0.20um (PC kawai ya tsara mafi ƙarancin buƙatun yanzu)
Im-Ag: 0.05 ~ 0.20um, kauri, mafi tsananin lalata shine (PC ba a kayyade ba)
Im-Sn: ≥0.08um. Dalilin kauri shine Sn da Cu za su ci gaba da haɓaka cikin CuSn a zafin jiki, wanda ke shafar ƙarfi.
HASL Sn63Pb37 gabaɗaya an kafa shi ta halitta tsakanin 1 zuwa 25um. Yana da wuya a sarrafa tsarin daidai. Ba tare da gubar ba galibi yana amfani da SnCu gami. Saboda tsananin zafin zafin aiki, yana da sauƙi don samar da Cu3Sn tare da ƙarancin ƙarancin sauti, kuma da kyar ake amfani dashi a halin yanzu.

(2) Rigar ruwa zuwa SAC387 (gwargwadon lokacin rigar a ƙarƙashin lokutan dumama daban -daban, naúrar: s).
Sau 0: im-sn (2) florida tsufa (1.2), osp (1.2) im-ag (3).
Zweiter PLENAR SESSION Zweiter PLENAR SESSION Im-Sn yana da mafi kyawun juriya, amma juriyarsa ta talauce!
Sau 4: ENG (3) -ImAg (4.3) -OSP (10) -ImSn (10).

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(3) The wettability zuwa SAC305 (bayan wucewa cikin tanderu sau biyu).
ENG (5.1) —Im-Ag (4.5) —Im-Sn (1.5) —OSP (0.3).
A zahiri, 'yan koyo na iya rikicewa sosai tare da waɗannan sigogin ƙwararrun, amma dole ne masana'antun tabbatar da PCB su lura da shi.


Lokacin aikawa: Mayu-28-2021