Copper sawb qhwv cov xov tooj, los ntawm kev qhwv tooj liab nyob ib ncig ntawm sab nraud ntawm lub rooj sib dhos thiab tuav nws nrog eutectic solder, ua kom cov neeg kho tshuab lub zog, thermal conductivity, thiab thermal shock resistance. Lawv yog cov qauv kev sib txuas tseem ceeb rau CCGA ntim hauv siab - thaj chaw muaj kev ntseeg siab xws li aerospace.
Piv rau cov tsoos cam khwb cia solder posts, tooj liab striped solder posts ua tau zoo dua nyob rau hauv complex thermal cycling thiab mechanical vibration ib puag ncig. Lawv cov yam ntxwv tseem ceeb yog raws li nram no:
Cov Qauv Tsim Kho Txhim Kho Kev Txhawb thiab Thermal Conductivity: Lub cev tseem ceeb ntawm cov ncej solder yog ua los ntawm 80Pb / 20Sn solder, nrog rau txheej txheej ntawm kwv yees li 0.051mm tuab tooj liab ntawv ci, thiab tom qab ntawd tag nrho cov ncej yog them nrog 63Sn / 37Pb eutectic solder rau fixation. Lub siab thermal conductivity ntawm tooj liab ua tau zoo txhawb kev hloov hluav taws xob los ntawm cov nti mus rau PCB, txo qhov kev pheej hmoo ntawm cov cua sov hauv zos.
Zoo heev Thermal Shock Resistance
Raws li kev ntsuam xyuas tsis muaj kev tiv thaiv thermal shock (GJB548B-2005 Method 1011.1 Condition C), tom qab 15, 30, thiab 45 cycles, tsis muaj qhov pom tseeb microcracks tshwm sim ntawm qhov sib txuas, thiab cov shear thiab tensile zog tseem ruaj khov, ua kom pom kev sib dhos ntau dua.
Siab dua Mechanical Strength thiab Fatigue Resistance
Lub sawb tooj liab muab kev txhawb nqa ntxiv, uas ua rau muaj qhov tsis zoo ntawm cov vuam nyob rau hauv kev nyuaj siab los ntawm thermal expansion coefficient (CTE) mismatch. Kev ntsuas kub ntawm lub voj voog qhia tau hais tias lub sijhawm tsis ua haujlwm ntawm 90Pb / 10Sn cov ncej zoo tib yam yog li 1/3 ua ntej tshaj ntawm cov hlua khi tooj liab - hom kev txhawb zog, thiab tom qab tsis ua haujlwm, nws nthuav tawm S- zoo li khoov, thaum lub sijhawm tom kawg khaws nws cov qauv qub.
