nkhani

Pafupifupi onsePCBs okhala ndi zigawo ziwiri kapena zosanjikiza zambiri amagwiritsa ntchito zokutidwa ndi mabowo (PTH) kulumikiza ma conductor pakati pa zigawo zamkati kapena kunja kwa zigawo, kapena kugwira mawaya otsogolera.Kuti izi zitheke, njira zabwino zolumikizira zimafunika kuti pakali pano ziziyenda pamabowo.Komabe, isanafike plating ndondomeko, kudzera mabowo si conductive chifukwa kusindikizidwa matabwa dera amapangidwa ndi sanali conductive gulu gawo lapansi zakuthupi (epoxy-galasi, phenolic-pepa, poliyesitala-galasi, etc.).Kuti apangitse bwino njira zabowo, pafupifupi ma microns 25 (1 mil kapena 0.001 in.) amkuwa kapena ochulukirachulukira ndi wopanga ma board amayenera kuyikidwa pamagetsi pamakoma a mabowo kuti apange kulumikizana kokwanira.

Pamaso pa electrolytical copper plating, sitepe yoyamba ndi mankhwala mkuwa plating, amatchedwanso electroless mkuwa deposition, kupeza woyamba conductive wosanjikiza pakhoma mabowo a matabwa osindikizidwa mawaya.Kuchepa kwa makutidwe ndi okosijeni kwa autocatalytic kumachitika pamwamba pa gawo lapansi losayendetsa podutsa mabowo.Pakhoma pali chotchinga chopyapyala kwambiri chamkuwa cha makulidwe a 1-3 micrometer chimayikidwa ndi mankhwala.Cholinga chake ndikupangitsa kuti dzenjelo liziyenda bwino kuti zilole kumangidwanso ndi mkuwa woyikidwa mu electrolytically ku makulidwe ofotokozedwa ndi wopanga mawaya board.Kuwonjezera mkuwa, tingagwiritse ntchito palladium, graphite, polima, ndi zina zotero.Koma mkuwa ndi njira yabwino kwambiri kwa wopanga zamagetsi pazochitika zachilendo.

Monga IPC-2221A tebulo 4.2 imanena kuti makulidwe ochepa amkuwa omwe amagwiritsidwa ntchito ndi njira yopangira mkuwa yopanda magetsi pamakoma a PTH pakuyika kwa mkuwa wapakati ndi 0.79 mil kwa kalasi Ⅰ ndi Kalasi Ⅱ ndi 0.98 mil kwakalasiⅢ.

Chingwe choyika zinthu mkuwa chimawongoleredwa ndi makompyuta ndipo mapanelo amanyamulidwa kudzera m'mabafa angapo amankhwala ndi ochapira ndi crane ya pamwamba.Poyamba, mapanelo pcb ndi chisanadze ankachitira, kuchotsa zotsalira zonse pobowola ndi kupereka roughness kwambiri ndi elekitirolo positive kwa mafunsidwe mankhwala a mkuwa.Chofunikira kwambiri ndi njira ya permanganate desmear ya mabowo.Panthawi ya chithandizo, utomoni wochepa kwambiri wa epoxy resin umayikidwa kutali ndi m'mphepete mwa mkati ndi makoma a mabowo, kuti atsimikizire kuti amamatira.Ndiye onse dzenje makoma kumizidwa mu kusamba yogwira kuti seeded ndi yaying'ono particles wa palladium mu osambira yogwira.Kusamba kumasungidwa pansi pa chipwirikiti cha mpweya wabwino ndipo mapanelo amayenda mosalekeza posamba kuti achotse thovu la mpweya lomwe lingakhale litapanga mkati mwa mabowo.Mkuwa wopyapyala womwe umayikidwa pamwamba pa gululo ndikubowola mabowo pambuyo posamba palladium.Electroless plating pogwiritsa ntchito palladium imapereka kumamatira kwamphamvu kwa zokutira zamkuwa ku fiberglass.Pamapeto pake kuwunika kumachitika kuti awone porosity ndi makulidwe a malaya amkuwa.

Gawo lirilonse ndilofunika kwambiri pazochitika zonse.Kusokoneza kulikonse munjira kungapangitse gulu lonse la matabwa a PCB kuti liwonongeke.Ndipo khalidwe lomaliza la pcb lagona kwambiri mu masitepe omwe atchulidwa apa.

Tsopano, ndi mabowo conductive, kugwirizana magetsi pakati pa zigawo zamkati ndi kunja zigawo anakhazikitsa matabwa dera.Chotsatira ndikukulitsa mkuwa m'mabowowo ndi zigawo zapamwamba ndi zapansi za matabwa a mawaya mpaka makulidwe enieni - electroplating yamkuwa.

Mizere yodzaza ndi ma electroless mkuwa mu PCB ShinTech yokhala ndi Cutting edge PTH Technology.

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