High Tg PCB
I-substrate yebhodi yesekethe ephezulu ye-Tg iya kutshintsha ukusuka "kwiglasi yeglasi" iye "kurabha wombuso" xa amaqondo obushushu enyukela kwindawo ethile, kwaye obu bushushu bubizwa ngokuba bubushushu beglasi (Tg) yebhodi. Ngamanye amagama, i-Tg bubushushu obuphezulu (℃) apho i-substrate ihlala iqinile. Oko kukuthi, izinto eziqhelekileyo ze-PCB ze-substrate kubushushu obuphezulu azivelisi kuphela ukuthamba, ukunyibilika, ukunyibilika kunye nezinye izinto, kodwa nokusebenza kwintsebenzo yomatshini, yombane yokwehla okubukhali (andicingi ukuba sifuna ukubona iimveliso zabo zivela le meko).
Ngokubanzi, ibhodi ye Tg na ngaphezu kweqondo lama-130, aphezulu Tg na ngaphezu kweqondo lama-170, kunye neliphakathi Tg na ngaphezu kweqondo lama-150.
Ngokwesiqhelo iTg≥170, i-PCB, ebizwa ngokuba yi-PCB ephezulu ye-Tg.
Xa i-Tg ye-substrate inyuka, ukumelana nobushushu bebhodi yesekethe, ukuxhathisa ukufuma, ukumelana neekhemikhali, ukumelana nozinzo kunye nezinye izinto ziya kuphuculwa. Ukunyuka kwexabiso le-TG, kungcono ukumelana nobushushu kwipleyiti. Kwaye i-TG ephezulu ihlala isetyenziswa kwinkqubo ekhokelayo,
I-Tg ephezulu ibhekisa kukumelana nobushushu obuphezulu. Ngophuhliso olukhawulezileyo lomzi mveliso we-elektroniki kunye neemveliso ze-elektroniki ezimelwe yikhompyuter, ukumelana okuphezulu kobushushu bezinto ze-PCB ze-substrate ziye zaba sisiqinisekiso esibalulekileyo xa uphuhliso lubhekisa kwimisebenzi ephezulu kunye ne-multilayer ephezulu. Ngaphezulu, ukubonakala kunye nophuhliso lobuchwephesha bokufakwa koxinizelelo olumelwe yi-SMT kunye ne-CMT yenza ukuba i-PCB inyuke ngakumbi nangakumbi xa ixhaswa kukumelana nobushushu obuphezulu be-substrate kwindawo encinci, isekethe entle kunye nefom encinci.
Ke ngoko, umahluko phakathi kwe-fr-4 ngokubanzi kunye ne-Tg fr-4 ephezulu kukuba kwimeko ye-thermal, ngakumbi kwimeko yobushushu emva kokufakwa kokufuma. Kwaye kukho umahluko omkhulu kumandla oomatshini, uzinzo olubonakalayo, ukunamathela, ukufunxwa kwamanzi, ukubola kobushushu, ukwanda kobushushu kunye nezinye iimeko zezixhobo. Iimveliso ezine-Tg ephezulu ngokucacileyo zingcono kunezinto eziqhelekileyo ze-PCB substrate. Kwiminyaka yakutshanje, inani labathengi elifuna ukuveliswa kwebhodi yesekethe ephezulu inyuke unyaka nonyaka.