Kushandiswa kwenitrogen muindasitiri yeSMT

SMT patch inoreva kupfupikiswa kwenhevedzano yemaitiro maitiro akavakirwa paPCB. PCB (Printed Circuit Board) ibhodhi redunhu rakadhindwa.

SMT ndiyo chidimbu cheSurface Mounted Technology, inova ndiyo inonyanya kufarirwa tekinoroji uye maitiro muindasitiri yegungano remagetsi. Tekinoroji yedunhu repamusoro regungano tekinoroji (Surface Mount Technology, SMT) inodaidzwa kunzi pamusoro pekukwira kana pamusoro pekusimudza tekinoroji. Iyo inzira yekuisa isina lead kana pfupi-lead pamusoro-yakaiswa zvikamu (zvinonzi SMC/SMD, inonzi chip components muchiChinese) pamusoro peakadhindwa redunhu board (PCB) kana imwe substrate. Tekinoroji yegungano redunhu inounganidzwa nekutengesa uchishandisa nzira dzakadai sereflow soldering kana dip soldering.

MuSMT welding process, nitrogen inonyanya kukodzera segasi rinodzivirira. Chikonzero chikuru ndechekuti simba rayo rakabatana rakakwirira, uye kugadzirisa kwemakemikari kunongoitika pasi pekushisa kwepamusoro uye kudzvinyirira kwakanyanya (> 500C,> 100bar) kana nekuwedzera kwesimba.

Nitrogen jenareta parizvino ndiyo yakakodzera nitrogen kugadzira michina inoshandiswa muindasitiri yeSMT. Semidziyo yekugadzira nitrogen pasaiti, jenareta yenitrogen inongozviitira otomatiki uye isina kutarisirwa, ine hupenyu hurefu, uye ine mwero wakaderera wekutadza. Zviri nyore kuwana nitrogen, uye mutengo zvakare wakaderera pakati pezvino nzira dzekushandisa nitrogen!

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Nitrogen yakashandiswa mukuyerera kwekutengesa gasi risati rashandiswa mune wave soldering process. Chikamu chechikonzero ndechekuti iyo hybrid IC indasitiri yagara ichishandisa nitrogen mukuyerera kwekutengesa kwepamusoro-gomo ceramic hybrid maseketi. Mamwe makambani paakaona mabhenefiti ekugadzira yakasanganiswa IC, vakashandisa musimboti uyu kuPCB soldering. Mumhando iyi yewelding, nitrogen inotsivawo okisijeni muhurongwa. Nitrogen inogona kuunzwa munzvimbo dzese, kwete chete munzvimbo yekuyerera, asiwo yekutonhodza maitiro. Zvizhinji zve reflow systems ikozvino nitrogen-yakagadzirira; mamwe masisitimu anogona kuvandudzwa nyore nyore kushandisa jekiseni regesi.

Kushandisa nitrogen mune reflow soldering kune zvinotevera zvakanakira:

‧Kukurumidza kunyorova kwematerminals nemapads

‧Shanduko diki mukutengesa

‧Kunatsiridza kutaridzika kwe flux yakasara uye solder joint surface

‧Kukurumidza kutonhora pasina mhangura oxidation

Segasi rinodzivirira, basa guru renitrogen mukukwesha nderekubvisa okisijeni panguva yekugadzira, kuwedzera weldability, uye kudzivirira zvakare oxidation. Kune yakavimbika welding, kunze kwekusarudza yakakodzera solder, kubatirana kwe flux kunowanzo kudiwa. Iyo flux inonyanya kubvisa oxides kubva kune welding chikamu cheSMA chikamu chisati chavenda uye inodzivirira re-oxidation yewelding chikamu, uye inoumba yakanakisa yekunyorova mamiriro ekuti solder ivandudze solderability. . Miedzo yakaratidza kuti kuwedzera formic acid pasi pekuchengetedzwa kwenitrogen kunogona kuita zviri pamusoro apa. Iyo mhete nitrogen wave solder muchina unotora tunnel-mhando welding tank chimiro inonyanya kuita tunnel-mhando welding processing tank. Chivharo chepamusoro chinoumbwa nezvimedu zvegirazi rinovhurika kuti ive nechokwadi chekuti oxygen haigone kupinda mutangi rekugadzirisa. Kana nitrogen inounzwa muwelding, ichishandisa zvikamu zvakasiyana zvegasi rinodzivirira nemhepo, nitrogen inozongoburitsa mweya kunze kwenzvimbo yewelding. Munguva yekugadzira, bhodhi rePCB rinoramba richiunza okisijeni munzvimbo yewelding, saka nitrogen inofanira kuramba ichiiswa munzvimbo yewelding kuitira kuti okisijeni irambe ichibuditswa kune yekubuda.

Nitrogen plus formic acid tekinoroji inowanzo shandiswa mune tunnel-type reflow furnaces ine infrared inosimudzira convection musanganiswa. Iyo yekupinza uye yekubuda inogadzirwa kuti ivhurwe, uye kune akawanda magonhi maketeni mukati ane chisimbiso chakanaka, anogona preheat uye preheat zvikamu. Kuomesa, reflow soldering uye kutonhora zvese zvinopedzwa mumugero. Mumamiriro ezvinhu aya akavhenganiswa, solder paste inoshandiswa haifaniri kunge iine activators, uye hapana zvakasara zvinosara paPCB mushure mekutengesa. Deredza oxidation, deredza kuumbwa kwemabhora ekutengesa, uye hapana bhiriji, iro rinonyanya kubatsira kune welding yemidziyo yakatsetseka. Inochengetedza michina yekuchenesa uye inochengetedza nharaunda yepasirese. Mari yekuwedzera yakaitwa nenitrogen inodzoserwa nyore nyore kubva kumari inochengetedzwa kubva mukuremara kwakaderedzwa uye zvinodiwa nevashandi.

Wave soldering uye reflow soldering pasi pe nitrogen chengetedzo inozova iyo huru tekinoroji mukusangana kwepamusoro. Iyo ring nitrogen wave solder muchina inosanganiswa nefomic acid tekinoroji, uye mhete yenitrogen reflow solder inosanganiswa neyakanyanya kuderera chiitiko solder paste uye formic acid, inogona kubvisa Kuchenesa maitiro. Mumazuva ano ari kukurumidza kuvandudza tekinoroji yeSMT welding, dambudziko guru rinosangana ndere nzira yekubvisa maokisi, kuwana nzvimbo yakachena yehwaro zvinhu, uye kuwana yakavimbika kubatana. Kazhinji, flux inoshandiswa kubvisa maokisi, kunyorovesa nzvimbo kuti itengeswe, kuderedza kushushikana kwepamusoro kweiyo solder, uye kudzivirira zvakare oxidation. Asi panguva imwecheteyo, flux inosiya zvakasara mushure mekutengesa, zvichikonzera mhedzisiro paPCB zvikamu. Nokudaro, bhodhi redunhu rinofanira kunyatsocheneswa. Nekudaro, saizi yeSMD idiki, uye mukaha pakati pezvisiri-kutengesa zvikamu zviri kuita diki uye diki. Kunyatsochenesa hakuchaiti. Chinonyanya kukosha kuchengetedzwa kwezvakatipoteredza. MaCFC anokonzera kukuvadzwa kweozone layer, uye maCFC sechinhu chikuru chekuchenesa anofanira kurambidzwa. Nzira inobudirira yekugadzirisa matambudziko ari pamusoro apa ndeyekutora kwete-yakachena tekinoroji mumunda wekusangana kwemagetsi. Kuwedzera diki uye uwandu huwandu hwefomic acid HCOOH kune nitrogen yaratidza kuva inoshanda isina-yakachena nzira isingade chero kuchenesa mushure mewelding, pasina mhedzisiro kana chero kunetseka pamusoro pezvisaririra.