Indasteri PCB electronics PCB phahameng TG170 12 mekhahlelo ENIG

High Layer PCB (High Layer PCB) ke PCB (Printed Circuit Board, printed circuit board) e nang le mekhahlelo e fetang 8.Ka lebaka la melemo ea eona ea boto ea potoloho ea li-multi-layer, boima bo phahameng ba potoloho bo ka finyelloa ka mokhoa o fokolang, ho nolofalletsang moralo o rarahaneng oa potoloho, kahoo e loketse haholo bakeng sa ts'ebetso ea matshwao a dijithale ka lebelo le phahameng, maqhubu a radio a microwave, modem, pheletso e phahameng. seva , polokelo ea data le likarolo tse ling.Hangata liboto tsa potoloho tse phahameng li entsoe ka liboto tse phahameng tsa TG FR4 kapa lisebelisoa tse ling tsa substrate tse sebetsang hantle, tse ka bolokang botsitso ba potoloho sebakeng sa mocheso o phahameng, mongobo o phahameng le oa maqhubu a phahameng.

Mabapi le boleng ba TG ba lisebelisoa tsa FR4

FR-4 substrate ke epoxy resin system, kahoo ka nako e telele, boleng ba Tg ke index e tloaelehileng ka ho fetisisa e sebelisoang ho arola FR-4 substrate grade, hape ke e 'ngoe ea matšoao a bohlokoa ka ho fetisisa a ts'ebetso ho IPC-4101, Tg. boleng ba sistimi ea resin, e bua ka thepa ho tloha sebakeng se batlang se sa tsitsa kapa sa "khalase" ho ea sebakeng se holofetseng kapa se nolofalitsoeng sa phetoho ea mocheso oa boemo.Phetoho ena ea thermodynamic e lula e fetoha ha feela resin e sa bole.Sena se bolela hore ha thepa e futhumetse ho tloha mocheso oa kamore ho ea mocheso o ka holimo ho boleng ba Tg, ebe e pholile ka tlaase ho boleng ba Tg, e ka khutlela boemong ba eona bo fetileng bo thata ka thepa e tšoanang.

Leha ho le joalo, ha thepa e futhumetse mocheso o phahameng haholo ho feta boleng ba eona ba Tg, liphetoho tse ke keng tsa fetoloa tsa boemo li ka bakoa.Phello ea mocheso ona e amana haholo le mofuta oa thepa, hape le ho senyeha ha mocheso oa resin.Ha re bua ka kakaretso, ha Tg ea substrate e phahame, e phahamisa ho tšepahala ha thepa.Haeba ts'ebetso ea welding e se nang lead e amoheloa, mocheso oa ho bola oa mocheso (Td) oa substrate le ona o lokela ho nahanoa.Matšoao a mang a bohlokoa a ts'ebetso a kenyelletsa coefficient ea ho eketsa mocheso (CTE), ho monya metsi, thepa ea ho khomarela thepa, le liteko tsa nako tse sebelisoang hangata joalo ka liteko tsa T260 le T288.

Phapang e hlakileng ka ho fetesisa lipakeng tsa lisebelisoa tsa FR-4 ke boleng ba Tg.Ho latela mocheso oa Tg, FR-4 PCB hangata e arotsoe ka lipoleiti tse tlase tsa Tg, Tg e mahareng le Tg e phahameng.Ka indasteri, FR-4 le Tg ho pota 135 ℃ hangata classified e le tlaase Tg PCB;FR-4 hoo e ka bang 150 ℃ e fetotsoe ho Tg PCB e mahareng.FR-4 e nang le Tg e ka bang 170 ℃ e ne e khetholloa e le Tg PCB e phahameng.Haeba ho na le linako tse ngata tsa ho hatella, kapa likarolo tsa PCB (tse fetang 14), kapa mocheso o phahameng oa welding (≥230 ℃), kapa mocheso o phahameng oa ho sebetsa (ho feta 100 ℃), kapa khatello e phahameng ea mocheso oa mocheso (joalo ka wave soldering), Tg PCB e phahameng e lokela ho khethoa.