Solder paste yog cov khoom siv tseem ceeb hauv Surface Mount Technology (SMT) ntawm PCBA kev tsim khoom, uas yog cov khoom sib xyaw ua ke ntawm cov hmoov hlau zoo, flux thiab additives, nrog cov nplaum zoo ib yam li cov tshuaj txhuam hniav [superscript: 3]. Nws koom ua ke cov ntaub ntawv thiab cov khoom siv sib xyaw ua ke, ua kom muaj kev sib raug zoo ntawm micro- cov khoom thiab PCB pads los ntawm cov txheej txheem reflow soldering, thiab siv dav hauv cov khoom siv hluav taws xob sib dhos.
Cov khoom tseem ceeb ntawm cov tshuaj txhuam hniav txiav txim siab nws qhov kev ua tau zoo: cov hmoov hlau alloy (qhov tseem ceeb ua haujlwm) feem ntau yog cov hlau lead-dawb alloys tam sim no, xws li SAC305 (Sn96.5Ag3.0Cu0.5) rau siab-kev ntseeg tau thiab Sn-Bi series rau qis-; qhov kub thiab txias cov flux yog lub luag haujlwm rau tshem tawm cov oxides, txo qhov nro ntawm qhov chaw thiab tiv thaiv reoxidation thaum lub sij hawm vuam, thiab cov ntsiab lus tseem ceeb yog tsis muaj - flux huv rau kev ua haujlwm siab thiab kev tiv thaiv ib puag ncig.
Nyob rau hauv daim ntawv thov, solder paste yog raug siv rau PCB pads los ntawm stencil printing, ces nto mount Cheebtsam muab tso rau nws, thiab thaum kawg rhuab nyob rau hauv ib tug reflow qhov cub [superscript:8]. Lub flux tau qhib ua ntej los ntxuav qhov chaw, tom qab ntawd cov hmoov hlau alloy melts kom nkag mus rau hauv cov ntaub qhwv thiab cov pins, tsim cov pob qij txha ruaj khov tom qab txias. Nws cov kev ua haujlwm tsis zoo xws li qhov loj me, viscosity thiab cov dej ntws ncaj qha cuam tshuam rau vuam zoo thiab cov txiaj ntsig ntawm PCBA cov khoom.
Tam sim no, solder paste yog tsim los ntawm kev tiv thaiv ib puag ncig, precision thiab kev ntseeg siab. Lead-cov qauv pub dawb ua raws li kev cai thoob ntiaj teb ib puag ncig, thaum nano- nplai solder paste thiab cov qauv tshwj xeeb rau cov ntim khoom semiconductor thiab cov tsheb tshiab lub zog tsis tu ncua ua tau raws li cov kev xav tau ntawm cov khoom siv me me thiab siab -kev tsim hluav taws xob.
