Kufunika kwa Tin-lead Solder Alloys

Pankhani ya matabwa osindikizira, sitingaiwale ntchito yofunikira ya zipangizo zothandizira.Pakadali pano, solder yomwe imagwiritsidwa ntchito kwambiri ndi malata-lead ndi solder wopanda kutsogolera.Wodziwika kwambiri ndi 63Sn-37Pb eutectic tin-lead solder, yomwe yakhala yofunika kwambiri pamagetsi pazaka pafupifupi 100.

Chifukwa cha kukana kwake kwa okosijeni bwino kutentha kwa chipinda, malata ndi chitsulo chotsika chosungunuka chokhala ndi mawonekedwe ofewa, komanso ductility bwino.Mtsogoleri si chitsulo chofewa chokha chokhala ndi mankhwala okhazikika, kukana kwa okosijeni, ndi kukana kwa dzimbiri, komanso kumakhala ndi kusungunuka kwabwino, ndi kutayika, ndipo n'kosavuta kukonza ndi nkhungu.Mtovu ndi malata zimasungunuka bwino.Kuonjezera milingo yosiyanasiyana ya mtovu ku malata kumatha kupanga solder yokwera, yapakatikati, komanso yotsika kwambiri.Makamaka, 63Sn-37Pb eutectic solder ili ndi magetsi abwino kwambiri, kukhazikika kwamankhwala,, makina opangira ndi kusinthika, malo osungunuka otsika komanso mphamvu zolumikizirana kwambiri, ndizinthu zabwino kwambiri zogulitsira pakompyuta.Chifukwa chake, malata amatha kuphatikizidwa ndi lead, siliva, bismuth, indium ndi zinthu zina zachitsulo kupanga solder yayikulu, yapakatikati komanso yotsika kutentha kwa ntchito zosiyanasiyana.

Basic thupi ndi mankhwala katundu malata

Tin ndi chitsulo chonyezimira choyera chasiliva chomwe chimakana kutulutsa okosijeni kutentha kwa firiji ndipo chimakhalabe chonyezimira chikayatsidwa ndi mpweya: ndi kachulukidwe ka 7.298 g/cm2 (15) ndi malo osungunuka a 232, ndi chitsulo chotsika chosungunuka. ndi mawonekedwe ofewa komanso ductility wabwino.

I. Gawo la kusintha kwa malata

Kusintha kwa gawo la tini ndi 13.2.woyera boroni malata pa kutentha kuposa gawo kusintha mfundo;pamene kutentha kumakhala kotsika kusiyana ndi kusintha kwa gawo, kumayamba kusanduka ufa.Pamene kusintha kwa gawo kukuchitika, voliyumu idzawonjezeka pafupifupi 26%.Kutentha kochepa kwa tini kusintha kumapangitsa kuti solder ikhale yolimba ndipo mphamvuyo imatha kutha.Mlingo wa kusintha gawo ndi yachangu padziko -40, ndi kutentha m'munsimu -50, zitsulo malata amasintha kukhala ufa imvi malata.Choncho, malata oyera sangathe kugwiritsidwa ntchito pa msonkhano wamagetsi.

II.The mankhwala zimatha malata

1. Tin imakhala ndi kukana kwa dzimbiri mumlengalenga, osati kosavuta kutaya kuwala, osakhudzidwa ndi madzi, mpweya, carbon dioxide.

2. Tin imatha kukana dzimbiri la organic acid ndipo imakhala ndi kukana kwakukulu kwa zinthu zopanda ndale.

3. Tini ndi chitsulo cha amphoteric ndipo amatha kuchitapo kanthu ndi asidi amphamvu ndi maziko, koma sangathe kukana chlorine, ayodini, caustic soda ndi alkali.

Zimbiri.Chifukwa chake, pama board ophatikizira omwe amagwiritsidwa ntchito m'malo a acidic, alkaline ndi mchere wamchere, zokutira katatu koletsa dzimbiri kumafunika kuteteza zolumikizira zogulitsira.
Pali ubwino ndi kuipa, izi ndi mbali ziwiri za ndalama.Pakuti PCBA kupanga, m'pofunika kuganizira mmene kusankha bwino malata-kutsogolera solder kapena ngakhale kutsogolera wopanda solder malinga ndi zinthu zosiyanasiyana kulamulira khalidwe.