Monga gawo lazoyendera zamagetsi, kufunikira kwa bolodi losindikizidwa yawonjezeka kwambiri. Pali njira zingapo zowasankhira ntchito. Koma zosankha kutengera kumapeto kwa nthaka zikuyamba kutchuka. Pamwamba pomaliza ndikuphimba komwe kumachitika pakatikati pa PCB. Chithandizo cham’mwamba chimakwaniritsa ntchito ziwiri – kuteteza dera lamkuwa ndikukhala malo otsekemera pamsonkhano wa PCB. Pali mitundu iwiri yayikulu yakumapeto kwa zinthu: organic ndi chitsulo. Nkhaniyi ikufotokoza chithandizo chazitsulo chodziwika bwino cha PCB – ma PCBS opangidwa ndi golide.

Mvetsetsani PCB yosanjikizidwa ndi golide 4

4-wosanjikiza PCB imakhala ndi zigawo 4 za gawo la FR4, 70 um golide ndi 0.5 OZ mpaka 7.0 OZ gawo lakuda lamkuwa. Kukula kwa dzenje locheperako ndi 0.25mm ndipo kuchepa kwa phula ndi phula ndi 4Mil.

Magolide ang’onoang’ono anali atakulungidwa ndi faifi kenako mkuwa. Nickel imakhala ngati chotchinga pakati pa mkuwa ndi golide ndipo imalepheretsa kusakanikirana. Golide amasungunuka nthawi yowotcherera. Nickel nthawi zambiri imakhala pakati pa 100 ndi 200 ma microinches wandiweyani ndi golide pakati pa 2 ndi 4 ma microinches wandiweyani.

Chiyambi cha njira zopaka golide pa PCB

Coating kuyanika kwaikidwa pamwamba pa zakuthupi za FR4 poyang’aniridwa bwino ndi mankhwala. Kuphatikiza apo, zokutira zimayikidwa pambuyo pokana kukana kugwiritsidwa ntchito. Nthawi zina, chovalacho chimagwiritsidwa ntchito asanawotchere, koma izi ndizochepa kwambiri. Kuphimba uku ndikokwera mtengo kuposa mitundu ina yazitsulo. Chifukwa chovalacho chimachitika ndi mankhwala, chimatchedwa chemical nickel leaching (ENIG).

Kugwiritsa ntchito zigawo zinayi za ENIG PCB

Ma PCBS awa amagwiritsidwa ntchito mu grid arrays (BGA) ndi zida zapamwamba (SMD). Golide amawerengedwa kuti ndi magetsi abwino. Ichi ndichifukwa chake ntchito zambiri pamisonkhano yadera zimakonda kugwiritsa ntchito njira zamtunduwu zamasamba okhala ndi kachulukidwe kakang’ono.

Ubwino wothandizidwa pamwamba pa golide wolowa

Ubwino wotsatira wazomaliza zopangidwa ndi golide zimawapangitsa kukhala odziwika kwambiri pamisonkhano yamagetsi.

Kuyika pafupipafupi sikofunikira.

Kuzungulira kwa reflux kumapitilira.

Fotokozerani kuthekera kwakukulu kwamagetsi

Kumamatira kwabwino

Amapereka zopingasa mozungulira ma circuits ndi mapadi.

Malo ozama amadzipangitsa kukhala osalala bwino.

Kodi china chotulutsa mzere.

Tsatirani njira zoyeserera zomwe zayesedwa nthawi yayitali.