Wopanga PCB Wopikisana

Pamene kutentha kwa gulu lapamwamba la Tg likukwera kudera linalake, gawo lapansi lidzasintha kuchokera ku "galasi state" kupita ku "rabara state", ndipo kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg) ya mbale. Mwanjira ina, Tg ndiye kutentha kwambiri (℃) komwe gawo lapansi limakhala lolimba. Ndiko kunena kuti, wamba PCB gawo lapansi zinthu pa kutentha osati umabala softening, mapindikidwe, kusungunuka ndi zochitika zina, komanso amasonyeza kuchepa kwambiri mawotchi ndi magetsi katundu (Sindikuganiza kuti mukufuna kuwona mankhwala awo kuonekera choncho. ).

General Tg mbale ndi kupitirira madigiri 130, Tg mkulu nthawi zambiri kuposa madigiri 170, ndi sing'anga Tg ndi pafupifupi madigiri 150.

Nthawi zambiri, The PCB yokhala ndi Tg≥170 ℃ imatchedwa gulu lalikulu la Tg.

Tg ya gawo lapansi imawonjezeka, ndipo kukana kutentha, kukana chinyezi, kukana kwa mankhwala, kukana kukhazikika ndi makhalidwe ena a bolodi la dera lidzasinthidwa ndikuwongolera. Mtengo wa TG ukakhala wapamwamba, ndiye kuti kutentha kwa mbale kudzakhala bwino. Makamaka munjira yopanda lead, TG yapamwamba imagwiritsidwa ntchito nthawi zambiri.

High Tg imatanthauza kukana kutentha kwakukulu. Ndi chitukuko chofulumira cha makampani amagetsi, makamaka zinthu zamagetsi zomwe zimayimiridwa ndi makompyuta, kupititsa patsogolo ntchito yapamwamba, multilayer, kufunika kwa PCB gawo lapansi zakuthupi apamwamba kutentha kukana ngati chitsimikizo chofunikira. Kuwonekera ndi chitukuko cha luso lapamwamba la kuika kachulukidwe koyimiridwa ndi SMT ndi CMT kumapangitsa PCB kudalira kwambiri chithandizo cha kutentha kwakukulu kwa gawo lapansi ponena za kabowo kakang'ono, mawaya abwino ndi mtundu woonda.

Chifukwa chake, kusiyana pakati pa wamba FR-4 ndi mkulu-TG FR-4 ndikuti m'malo otentha, makamaka pambuyo pa hygroscopic ndi kutentha, mphamvu yamakina, kukhazikika kwa mawonekedwe, kumamatira, kuyamwa kwamadzi, kuwonongeka kwamafuta, kukulitsa kwamafuta ndi zina. zipangizo ndi zosiyana. Zogulitsa zapamwamba za Tg ndizabwinoko kuposa zida wamba za PCB. M'zaka zaposachedwa, chiwerengero cha makasitomala omwe amafunikira gulu lapamwamba la Tg chawonjezeka chaka ndi chaka.