Kodi Nayitrogeni Imagwira Ntchito Motani mu Ovuni Yowonjezereka?

SMT reflow uvunindi nayitrogeni (N2) ndi mbali yofunika kwambiri kuchepetsa kuwotcherera pamwamba makutidwe ndi okosijeni, kusintha wettability wa kuwotcherera, chifukwa nayitrogeni ndi mtundu wa mpweya inert, si zophweka kutulutsa mankhwala ndi zitsulo, angathenso kudula mpweya mu mlengalenga. ndi zitsulo kukhudzana pa kutentha ndi imathandizira makutidwe ndi okosijeni anachita.

Choyamba, mfundo yakuti nayitrogeni ikhoza kupititsa patsogolo kutsekemera kwa SMT kumachokera ku mfundo yakuti kugwedezeka kwa solder pansi pa chilengedwe cha nayitrogeni kumakhala kochepa kuposa komwe kumawonekera mumlengalenga, zomwe zimapangitsa kuti madzi azisungunuka komanso kunyowa kwa solder.

Kachiwiri, nayitrogeni amachepetsa solubility wa mpweya mu mpweya choyambirira ndi zinthu zimene zingasokoneze kuwotcherera pamwamba, kuchepetsa kwambiri makutidwe ndi okosijeni wa mkulu kutentha solder, makamaka kusintha kwa mbali yachiwiri backwelding khalidwe.

Nayitrogeni si njira yothetsera makutidwe ndi okosijeni a PCB.Ngati pamwamba pa chigawo kapena bolodi lozungulira ndi oxidized kwambiri, nayitrogeni sichidzabwezeretsanso moyo, ndipo nayitrogeni ndiwothandiza pakutulutsa pang'ono kwa okosijeni.

Ubwino wauvuni wa solder reflowndi nitrogen:
Chepetsani makutidwe ndi okosijeni m'ng'anjo
Sinthani mphamvu zowotcherera
Kuwonjezera solderability
Chepetsani kuchuluka kwa patsekeke.Chifukwa solder phala kapena solder pad oxidation yachepetsedwa, kutuluka kwa solder kuli bwino.

Kuipa kwaMakina osindikizira a SMTndi nitrogen:
kuwotcha
Imawonjezera mwayi wopanga miyala yamwala
Kupititsa patsogolo capillarity (wick effect)