Lead-dawb thiab lead-raws li solder balls yog ob hom khoom siv hauv hluav taws xob soldering. Lawv txawv heev nyob rau hauv muaj pes tsawg leeg, kev ua tau zoo, daim ntawv thov scenarios, thiab ib puag ncig yuav tsum tau.
Kev ua tau zoo sib txawv:
1. Melting Point: Lead- cov khoom siv dawb dawb feem ntau muaj cov ntsiab lus melting ntau dua li cov hlau lead- raws li cov khoom siv. Piv txwv li, SAC305 muaj ib tug melting point ntawm kwv yees li 217{10}}220 degree, thaum Sn63Pb37 muaj ib tug melting point ntawm kwv yees li 183 degree. Qhov no txhais tau hais tias cov khoom siv lead-free solder xav tau qhov kub siab dua kom ncav cuag lub xeev molten thaum lub sij hawm soldering, muab qhov xav tau ntau dua ntawm cov khoom siv thiab cov txheej txheem.
2. Wettability: Lead-raws li solder balls pom zoo wettability thaum lub sij hawm soldering, txhais tau hais tias lub solder kis ntau tusyees nyob rau hauv soldering nto, ua ib tug zoo solder sib koom. Thaum cov hlau lead- cov pob dawb solder txhim kho qhov ntub dej los ntawm kev ntxiv lwm cov ntsiab lus, lawv tseem tuaj yeem ua tsis zoo rau cov hlau lead-raws li solder hauv qee qhov xwm txheej.
3. Mechanical Properties: Cov pob qij txha soldered nrog cov hlau lead- cov khoom dawb solder feem ntau muaj zog dua txhua yam thiab qaug zog, ua tsaug rau cov khoom xws li nyiaj thiab tooj liab hauv lawv cov alloy muaj pes tsawg leeg. Cov yam ntxwv no ua rau cov hlau lead-dawb solders muaj txiaj ntsig zoo dua hauv cov ntawv thov uas xav tau kev tiv thaiv siab rau kev siv tshuab siab.
Kev ntseeg tau: Lead- cov khoom siv tsis pub dawb muaj qhov zoo dua corrosion kuj nyob rau lub sij hawm ntev - siv, txo qhov kev pheej hmoo ntawm kev sib koom tes tsis ua haujlwm vim yog ib puag ncig. Tsis tas li ntawd, kev siv cov hlau lead- cov solders dawb ua raws li cov qauv thoob ntiaj teb ib puag ncig, pab txhawb kev txhim kho cov khoom lag luam kev sib tw.
Tus nqi sib txawv: Lead- cov khoom siv dawb dawb feem ntau raug nqi ntau dua cov hlau lead- uas muaj cov khoom siv vim lawv xav tau cov purity siab dua thiab lwm yam hlau zoo nkauj. Txawm li cas los xij, nrog rau kev nce qib hauv cov hlau lead-cov khoom siv hluav taws xob pub dawb thiab kev lag luam nthuav dav, qhov sib txawv ntawm tus nqi no maj mam nqaim. Tsis tas li ntawd, xav txog qhov zoo ntawm ib puag ncig thiab kev ua tau zoo ntawm cov hlau lead- dawb solder, nws lub sij hawm ntev - nqi - kev ua tau zoo yuav tseem ceeb dua.
