SMT reflow qhov cubnrog nitrogen (N2) yog lub luag haujlwm tseem ceeb tshaj plaws hauv kev txo cov vuam nto oxidation, txhim kho wettability ntawm vuam, vim nitrogen yog ib hom roj inert, tsis yooj yim los tsim cov tebchaw nrog hlau, nws tuaj yeem txiav tawm cov pa oxygen hauv huab cua. thiab hlau kov ntawm qhov kub thiab txias thiab ceev cov tshuaj tiv thaiv oxidation.
Ua ntej, lub hauv paus ntsiab lus uas nitrogen tuaj yeem txhim kho SMT weldability yog raws li qhov tseeb tias qhov nro ntawm cov khoom siv nyob rau hauv ib puag ncig nitrogen tsawg dua li qhov cuam tshuam rau atmospheric ib puag ncig, uas txhim kho lub fluidity thiab wettability ntawm solder.
Thib ob, nitrogen txo cov solubility ntawm oxygen nyob rau hauv cov huab cua qub thiab cov khoom uas tuaj yeem ua paug qhov chaw vuam, zoo heev txo cov oxidation ntawm kub kub solder, tshwj xeeb tshaj yog nyob rau hauv kev txhim kho ntawm ob sab backwelding zoo.
Nitrogen tsis yog panacea rau PCB oxidation.Yog hais tias qhov saum npoo ntawm cov khoom siv los yog lub rooj tsav xwm hauv Circuit Court yog hnyav oxidized, nitrogen yuav tsis coj nws rov qab mus rau lub neej, thiab nitrogen tsuas yog pab tau rau me oxidation.
Qhov zoo ntawmsolder reflow qhov cubnrog nitrogen:
Txo cov cua sov oxidation
Txhim kho vuam muaj peev xwm
Txhim kho solderability
Txo cov kab noj hniav.Vim hais tias solder paste los yog solder ncoo oxidation yog txo, qhov khiav ntawm solder yog zoo dua.
Qhov tsis zoo ntawmSMT soldering tshuabnrog nitrogen:
hlawv
Nce lub caij nyoog ntawm tombstone tiam
Enhanced capillarity (cov nyhuv wick)
Post lub sij hawm: Aug-24-2021