Kungakhathaliseki ukuthi isakhiwo laminated of the I-PCB ye-multilayer, umkhiqizo wokugcina uyisakhiwo se-laminated se-foil yethusi ne-dielectric. Izinto ezithinta ukusebenza kwesifunda kanye nokusebenza kwenqubo ngokuyinhloko yizinto ze-dielectric. Ngakho-ke, ukukhetha kwebhodi le-PCB ngokuyinhloko ukukhetha izinto ze-dielectric, kufaka phakathi ama-prepregs namabhodi ayisisekelo. Ngakho-ke yini okufanele inakwe lapho ukhetha?

1. Izinga lokushisa lengilazi (Tg)

I-Tg iyindawo eyingqayizivele yama-polymers, izinga lokushisa elibalulekile elinquma izakhiwo zezinto ezibonakalayo, kanye nepharamitha eyinhloko yokukhetha izinto ze-substrate. Izinga lokushisa le-PCB lidlula i-Tg, futhi i-coefficient yokwandisa okushisayo iba nkulu.

Ngokwezinga lokushisa le-Tg, amabhodi e-PCB ngokuvamile ahlukaniswa ngamabhodi e-Tg aphansi, e-Tg aphakathi nendawo kanye namabhodi e-Tg aphezulu. Embonini, amabhodi ane-Tg engaba ngu-135 ° C ngokuvamile ahlukaniswa njengamabhodi e-low-Tg; amabhodi ane-Tg engaba ngu-150 ° C ahlukaniswa njengamabhodi e-Medium-Tg; futhi amabhodi ane-Tg engaba ngu-170 ° C ahlukaniswa njengamabhodi e-high-Tg.

Uma kunezikhathi eziningi zokucindezela phakathi nokucubungula kwe-PCB (isikhathi esingaphezu kwesi-1), noma kunezendlalelo eziningi ze-PCB (izingqimba ezingaphezu kwezingu-14), noma izinga lokushisa lokunamathisela liphezulu (>230℃), noma izinga lokushisa lokusebenza liphezulu (ngaphezu kuka-100). XNUMX℃), noma ingcindezi yokushisa eshisayo inkulu (Okufana ne-wave soldering), amapuleti e-Tg aphezulu kufanele akhethwe.

2. I-Coefficient of Thermal Expansion (CTE)

I-coefficient yokwanda okushisayo ihlobene nokuthembeka kokushisela nokusetshenziswa. Umgomo wokukhetha kufanele uhambisane ne-coefficient yokwandisa ye-Cu ngangokunokwenzeka ukuze kuncishiswe ukuwohloka kwe-thermal (ukuguqulwa okuguquguqukayo) ngesikhathi sokushisela).

3. Ukumelana nokushisa

Ukumelana nokushisa ikakhulukazi kubheka ikhono lokumelana nezinga lokushisa le-soldering kanye nenani lezikhathi ze-solder. Ngokuvamile, ukuhlolwa kwe-welding kwangempela kwenziwa ngezimo zenqubo eziqinile kancane kune-welding evamile. Kungase futhi kukhethwe ngokuvumelana nezinkomba zokusebenza ezifana ne-Td (izinga lokushisa elingu-5% lokulahlekelwa isisindo ngesikhathi sokushisa), i-T260, ne-T288 (isikhathi sokuqhekeka esishisayo).