1. PCB Key Performance Indicators
Lub cev muaj zog: tev lub zog / coefficient ntawm thermal expansion / tev lub zog
Cov khoom siv tshuaj lom neeg: Tg / Td / Z-CTE Cov khoom siv hluav taws xob: dielectric tas li / dielectric poob / nplaim taws retardancy Ib puag ncig khoom: dej nqus tus nqi / CAF tsis kam / CTI
2. iav hloov kub Tg
Cov iav hloov pauv kub Tg yog qhov tseem ceeb ntawm cov khoom siv PCB, uas yog hais txog qhov kub thiab txias ntawm cov khoom siv hloov ntawm lub xeev iav mus rau lub xeev rubbery. Thaum qhov kub thiab txias qis dua Tg, cov khoom siv PCB yog nyob rau hauv lub iav nruj; Thaum qhov kub siab tshaj Tg, cov khoom yuav ua mos thiab hloov tau zoo li roj hmab, nrog rau cov khoom siv rov qab deformation.
3. IPC txheem kev faib tawm:
Ntau dua lossis sib npaug li 130 degree C qis Tg Ntau dua lossis sib npaug li 150 degree C nruab nrab Tg Ntau dua lossis sib npaug li 170 degree C siab Tg muaj kev cuam tshuam rau PCB kev siv: Tg tuaj yeem cuam tshuam rau Z-CTE, qhov kub thiab txias deformation, dimensional stability, thiab lwm yam khoom ntawm cov khoom.
3. Coefficient ntawm thermal expansion
Lub coefficient ntawm thermal expansion (CTE) ntawm PCB yog ib qho tseem ceeb parameter rau kev ntsuas qhov seem stability ntawm cov ntaub ntawv nyob rau hauv kub hloov. Lub thermal expansion coefficient yog muab faib ua X-axis, Y-axis, thiab Z-axis thermal expansion coefficients, feem ntau xa mus rau Z-axis expansion coefficient, vim nws muaj kev cuam tshuam loj tshaj plaws ntawm cov khoom siv. Tshwj xeeb, CTE piav qhia txog qhov piv ntawm qhov hloov pauv ntawm cov khoom siv ntev ntawm ib chav tsev kub hloov mus rau qhov qub ntev. Rau cov ntaub ntawv PCB, linear coefficient ntawm thermal expansion feem ntau yog siv los ntsuas qhov hloov pauv ntawm qhov loj me thaum hloov pauv kub.
4. Thermal decomposition kub Td
Lub thermal decomposition kub Td yog hais txog qhov kub ntawm cov khoom siv PCB pib decompose ntawm qhov kub thiab txias. Qhov no kuj yog ib qho tseem ceeb rau kev tsim cov txheej txheem kub hloov PCB. Lub thermal decomposition kub ntawm cov ntaub ntawv PCB tuaj yeem cuam tshuam rau lawv txoj kev ruaj ntseg thiab kev ua neej nyob ntawm kev ua haujlwm kub. Yog tias cov thermal decomposition kub ntawm cov ntaub ntawv PCB tsawg, lawv yuav ua rau decomposition thiab oxidation ntawm qhov kub siab, ua rau degradation thiab tsis ua hauj lwm ntawm cov khoom siv. Yog li ntawd, thaum xaiv cov khoom siv PCB, nws yog ib qho tsim nyog yuav tsum xav txog lawv cov thermal decomposition kub kom ntseeg tau tias lawv ruaj khov thiab ua neej nyob ntawm kev ua haujlwm kub.
5. Copper foil tev lub zog
Peel lub zog yog ib qho kev ntsuas ntawm lub zog sib txuas ntawm tus neeg xyuas pib thiab cov khoom siv substrate. Lub thickness ntawm cov ntawv ci tooj liab yuav cuam tshuam rau lub tev lub zog tus nqi ntawm qhov kev xeem, defaulting rau 1oz tuab tooj liab. Lub tev lub zog ntawm cov ntawv ci tooj liab yog ib qho tseem ceeb rau kev ntsuas qhov zoo ntawm PCB. Kev ntsuam xyuas lub zog tev feem ntau yog hais txog kev sib txuas lub zog ntawm cov ntawv ci tooj liab thiab substrate lossis nruab nrab ntawm cov ntawv ci tooj liab thiab cov yeeb yaj kiab browning. Los ntawm kev siv lub tshuab ntsuas tensile universal rau vertically stretch tooj liab ntawv nyiaj ntawm ib tug npaum li cas, tus nqi quab yuam thaum lub sij hawm tev ntawm tooj liab ntawv ci los ntawm lub substrate yog kuaj pom, thiab lub tev lub zog yog xam.
6. Kev nqus dej thiab hygroscopicity
Cov yam ntxwv cuam tshuam: Kev nqus dej thiab hygroscopicity ntawm PCB feem ntau cuam tshuam los ntawm nws cov khoom muaj pes tsawg leeg thiab cov txheej txheem tsim khoom. Piv txwv li, qee cov ntaub ntawv PCB tuaj yeem muaj cov pawg hydrophilic lossis cov qauv pore, uas tuaj yeem ua rau kom cov dej nqus thiab nqus dej ntawm PCBs. Kev cuam tshuam kev ua tau zoo: Thaum PCB nqus dej noo, nws qhov kev ua haujlwm tseem ceeb xws li dielectric tas li thiab thermal expansion coefficient yuav hloov. Cov kev hloov no yuav ua rau qeeb lossis distortions hauv cov teeb liab kis, yog li cuam tshuam rau kev ua haujlwm ntawm tag nrho cov khoom siv hluav taws xob. Qhov teeb meem kev ntseeg tau: PCBs raug cov av noo ib puag ncig ntev tuaj yeem nqus dej thiab nthuav dav, ua rau muaj kev hloov pauv loj, deformation, lossis tawg. Cov teeb meem no tsis yog tsuas yog cuam tshuam rau qhov tseeb ntawm cov khoom siv hluav taws xob, tab sis kuj tseem tuaj yeem ua rau lub cev tsis ua haujlwm thiab txo qhov kev ntseeg siab ntawm cov khoom siv hluav taws xob. Kev tiv thaiv kev ntsuas: Txhawm rau txo qhov nqus dej thiab nqus dej noo ntawm PCBs, qee qhov kev tiv thaiv tuaj yeem ua tau. Piv txwv li, txheej txheej txheej tsis muaj dej tsis zoo rau ntawm qhov chaw ntawm PCB lossis siv cov ntaub ntawv uas muaj qhov nqus dej tsawg. Tsis tas li ntawd, thaum tsim thiab tsim cov txheej txheem, daim ntawv thov ib puag ncig thiab cov av noo ntawm PCBs yuav tsum tau txiav txim siab tag nrho, thiab cov ntaub ntawv tsim nyog thiab cov txheej txheem yuav tsum raug xaiv.
7. nplaim retardancy
Cov nplaim retardancy ntawm PCB yog ib qho tseem ceeb qhia txog kev ua tau zoo siv los ntsuas cov yam ntxwv ntawm cov khoom siv tom qab hluav taws kub. Raws li cov khoom sib txawv ntawm cov nplaim hluav taws, PCBs tuaj yeem muab faib ua peb theem: V-0, V-1, thiab V-2.
8. Dielectric tsis tu ncua
Lub dielectric tas li ntawm resin yog me dua li ntawm iav ntaub, thiab raws li cov ntsiab lus ntawm resin nce, lub dielectric tas li txo. Lub dielectric qhov tsis tu ncua yog qhov tseem ceeb rau kev ntsuas cov khoom hluav taws xob ntawm cov ntaub ntawv insulating, tshwj xeeb, nws sawv cev rau cov txheeb ze permittivity ntawm insulating cov ntaub ntawv uas muaj nyob nruab nrab ntawm cov electrode daim hlau ntawm lub capacitor. Qhov loj dua qhov dielectric tsis tu ncua, qhov zoo dua qhov kev ua haujlwm ntawm rwb thaiv tsev.
9. Lossis factor
Qhov tsis zoo (tseem hu ua poob tangent lossis poob lub kaum sab xis) yog qhov ntsuas uas piav qhia txog lub zog poob ntawm cov khoom hauv qab kev ua ntawm hluav taws xob. Qhov loj dua qhov poob, qhov siab dua lub zog poob ntawm cov khoom nyob rau hauv qhov kev txiav txim ntawm ib qho hluav taws xob teb. Tsis tas li ntawd, cov txheej txheem tsim khoom ntawm PCBs kuj tuaj yeem cuam tshuam rau qhov poob. Piv txwv li, yam xws li kev kho deg, txheej txheem lamination, thiab tooj liab foil thickness ntawm PCBs tuaj yeem muaj qee yam cuam tshuam rau qhov poob. Yog li ntawd, hauv kev siv cov tswv yim, nws yog ib qho tsim nyog yuav tsum xaiv cov khoom siv PCB tsim nyog thiab cov txheej txheem ua raws li cov kev cai tshwj xeeb thiab cov txheej txheem tsim khoom kom txo qis cov khoom poob thiab txhim kho kev ua haujlwm hauv Circuit Court thiab kev ntseeg tau.
10. CAF tsis kam ua haujlwm
CAF tsis kam ntawm PCB hais txog nws lub peev xwm los tiv thaiv ion tsiv teb tsaws, tshwj xeeb tshaj yog nyob rau hauv qhov chaw ntub dej. CAF, tseem hu ua Conductive Anodic Filament, yog cov tshuaj tiv thaiv hluav taws xob uas tshwm sim hauv qhov chaw ntub dej, ua rau cov kab hluav taws xob sib txuas ntawm cov anode thiab cathode hauv Circuit Court, ua rau luv luv Circuit Court.
11. Leakage resistance Performance index CTI
PCB leakage resistance index (CTI) yog hais txog tus nqi hluav taws xob siab tshaj plaws uas cov khoom siv hluav taws xob rwb thaiv tsev tuaj yeem tiv taus 50 tee ntawm electrolyte yam tsis muaj cov cim xau nyob rau hauv kev sib koom ua ke ntawm hluav taws xob thiab electrolyte, qhia hauv V. Cov tshuaj tiv thaiv to leakage tester siv rau kev kuaj CTI muaj cov khoom siv hluav taws xob, ob lub duab plaub electrodes nrog rau ntu ntu ntawm 2mm x 5mm ua los ntawm platinum, 30 degree kaum sab xis ntawm ib kawg ntawm cov electrode, thiab ib rab koob rau ntxiv electrolyte.