Raws li ib feem ntawm hluav taws xob hluav taws xob, qhov tseem ceeb ntawm luam tawm hauv Circuit Court board tau nce ntau heev. Muaj ntau txoj hauv kev los xaiv lawv rau cov haujlwm. Tab sis kev xaiv raws qhov ua tiav saum npoo tau txais koob meej. Kev ua tiav saum npoo yog txheej txheej txheej txheej sab nrauv ntawm PCB. Kev kho saum npoo av ua tiav ob txoj haujlwm – tiv thaiv cov tooj liab tooj liab thiab ua lub ntsej muag txuas tau thaum lub rooj sib dhos PCB. Muaj ob hom tseem ceeb ntawm kev ua tiav saum npoo: organic thiab xim hlau. Kab lus no tham txog kev kho cov hlau PCB nto nto-kub-impregnated PCBS.

Nkag siab 4-txheej kub-plated PCB

4-txheej PCB muaj 4 txheej ntawm FR4 substrate, 70 um kub thiab 0.5 OZ txog 7.0 OZ tuab tooj liab substrate. Qhov tsawg kawg nkaus qhov loj yog 0.25mm thiab qhov tsawg kawg nkaus taug/suab yog 4Mil.

Cov khaubncaws sab nraud povtseg ntawm cov kub tau plated ntawm npib tsib xee thiab tom qab ntawd mus rau tooj liab. Npib tsib xee ua raws li kev sib kis ntawm tooj liab thiab kub thiab tiv thaiv lawv los ntawm kev sib xyaw. Kub yaj thaum vuam. Nickel feem ntau ntawm 100 thiab 200 microinches tuab thiab kub ntawm 2 thiab 4 microinches tuab.

Taw qhia txog cov txheej txheem kub plating ntawm PCB

Cov txheej txheej tau tso rau saum npoo ntawm FR4 cov khoom los ntawm kev tshuaj xyuas tshuaj lom ze. Tsis tas li ntawd, txheej txheej tau thov tom qab siv tshuaj tiv thaiv tsis haum. Hauv qee kis, txawm li cas los xij, txheej txheej tau thov ua ntej vuam, tab sis qhov no yog qhov tsawg heev. Cov txheej no kim dua lwm hom hlau txheej. Vim tias txheej txheej tau ua tiav tshuaj, nws hu ua tshuaj nickel leaching (ENIG).

Siv plaub txheej ntawm ENIG PCB

Cov PCBS no tau siv hauv pob kab sib chaws (BGA) thiab cov khoom siv saum npoo (SMD). Kub yog suav tias yog tus coj hluav taws xob zoo. Qhov no yog vim li cas ntau qhov kev pabcuam sib dhos hauv Circuit Court zoo li siv hom kev kho saum npoo rau cov kab hluav taws xob siab.

Qhov zoo ntawm kev kho saum npoo av kub kub

Cov txiaj ntsig hauv qab no ntawm kev ua kom tsis muaj xim kub ua rau lawv nrov heev hauv cov kev pabcuam sib dhos hluav taws xob.

Tsis tas yuav tsum tau plating virtual ntau.

Lub voj voog reflux yog tas li.

Muab lub peev xwm ntsuas hluav taws xob zoo tshaj plaws

Zoo adhesion

Muab kab rov tav plating ncig cov kab hluav taws xob thiab cov pawm.

Cov dej hauv av muab cov tiaj tiaj zoo.

Tau weld kab.

Ua raws txoj hauv kev sim daim ntawv thov sijhawm.