Inganda PCB electronics PCB hejuru TG170 ibice 12 ENIG

Hejuru ya PCB (High Layer PCB) ni PCB (Icapa ryumuzunguruko wacapwe, icyapa cyumuzingo cyacapwe) gifite ibice birenga 8.Bitewe nibyiza byayo byubuyobozi bwumuzunguruko wibice byinshi, ubwinshi bwumuzunguruko burashobora kugerwaho mukirenge gito, bigafasha igishushanyo mbonera cyumuzunguruko, bityo rero birakwiriye cyane mugutunganya ibimenyetso byihuse byihuta, gutunganya radiyo microwave, modem, iherezo-ryanyuma seriveri, kubika amakuru nizindi nzego.Ikibaho cyo murwego rwohejuru mubusanzwe gikozwe mubibaho byo hejuru-TG FR4 cyangwa ibindi bikoresho byo hejuru cyane, bishobora kugumya guhagarara neza mubushyuhe bwinshi, ubushuhe bwinshi, hamwe nibidukikije byinshi.

Kubireba TG indangagaciro yibikoresho bya FR4

FR-4 substrate ni epoxy resin sisitemu, kubwigihe kirekire rero, agaciro ka Tg nigipimo gikunze gukoreshwa mugutondekanya icyiciro cya substrate ya FR-4, nacyo nikimwe mubimenyetso byingenzi byerekana imikorere ya IPC-4101, Tg agaciro ka sisitemu ya resin, bivuga ibikoresho biva muburyo bugoye cyangwa "ikirahure" kugirango bihindurwe byoroshye cyangwa byoroshe guhinduka kwubushyuhe bwa leta.Ihinduka rya thermodynamic rihora rihinduka mugihe cyose resin itangirika.Ibi bivuze ko iyo ibikoresho bishyushye kuva mubushyuhe bwicyumba kugeza ku bushyuhe buri hejuru yagaciro ka Tg, hanyuma bigakonjeshwa munsi yagaciro ka Tg, birashobora gusubira mubihe byabanje gukomera hamwe nibintu bimwe.

Ariko, mugihe ibikoresho bishyushye kubushyuhe burenze kure agaciro ka Tg, impinduka zidasubirwaho leta ihinduka irashobora guterwa.Ingaruka yubu bushyuhe ifite byinshi byo gukora nubwoko bwibikoresho, kandi hamwe nubushuhe bwumuriro wa resin.Muri rusange, hejuru ya Tg ya substrate, niko kwizerwa kwibintu.Niba inzira-yo gusudira idafite isuku yemewe, ubushyuhe bwangirika bwumuriro (Td) bwa substrate nabwo bugomba gutekerezwa.Ibindi bipimo byingenzi byerekana imikorere harimo coefficente yo kwagura ubushyuhe (CTE), kwinjiza amazi, imiterere yibikoresho, hamwe nibisanzwe bikoreshwa mugihe cyibizamini nka T260 na T288.

Itandukaniro rigaragara cyane hagati ya FR-4 nibikoresho bya Tg.Ukurikije ubushyuhe bwa Tg, FR-4 PCB muri rusange igabanijwemo Tg nkeya, Tg yo hagati na Tg ndende.Mu nganda, FR-4 hamwe na Tg hafi 135 usually mubisanzwe ishyirwa mubikorwa nka Tg PCB yo hasi;FR-4 hafi 150 ℃ yahinduwe hagati ya Tg PCB.FR-4 hamwe na Tg hafi 170 ℃ yashyizwe mubikorwa nka Tg PCB yo hejuru.Niba hari ibihe byinshi byingutu, cyangwa PCB ibice (birenga 14), cyangwa ubushyuhe bwo hejuru bwo gusudira (≥230 ℃), cyangwa ubushyuhe bwo hejuru bwo gukora (burenga 100 ℃), cyangwa guhagarika ubushyuhe bwinshi bwo gusudira (nko kugurisha imiraba), muremure Tg PCB igomba guhitamo.