Ntau tus neeg ua si DIY yuav pom tias cov xim PCB siv los ntawm ntau yam khoom siv hauv kev ua lag luam yog dazzling. Cov xim PCB ntau dua yog xim dub, ntsuab, xiav, daj, ntshav, liab thiab xim av. Qee cov tuam ntxhab tau tsim cov PCBs ntawm cov xim sib txawv xws li dawb thiab liab.

Hauv kev xav ib txwm muaj, PCB dub zoo li tau muab tso rau ntawm qhov kawg siab, thaum liab thiab daj tau mob siab rau qhov qis kawg. Tsis yog qhov tseeb?

PCB tooj liab txheej uas tsis coated nrog solder daim npog qhov ncauj yog yooj yim oxidized thaum raug huab cua

Peb paub tias ob sab ntawm PCB yog cov txheej tooj liab. Hauv kev tsim cov PCB, cov txheej tooj liab yuav tau txais ib qho chaw du thiab tsis muaj kev tiv thaiv txawm tias nws yog tsim los ntawm cov txheej txheem ntxiv lossis rho tawm.

Txawm hais tias cov khoom siv tshuaj lom neeg ntawm tooj liab tsis muaj zog xws li txhuas, hlau, magnesium, thiab lwm yam, nyob rau hauv lub xub ntiag ntawm dej, ntshiab tooj liab yog yooj yim oxidized nyob rau hauv kev sib cuag nrog oxygen; vim tias cov pa oxygen thiab dej vapor muaj nyob hauv huab cua, qhov chaw ntawm cov tooj liab ntshiab raug rau huab cua Oxidation cov tshuaj tiv thaiv yuav tshwm sim sai sai.

Vim tias qhov tuab ntawm cov txheej tooj liab hauv PCB yog nyias nyias, oxidized tooj liab yuav dhau los ua cov neeg siv hluav taws xob tsis zoo, uas yuav ua rau cov hluav taws xob ua tau zoo ntawm tag nrho PCB.

Txhawm rau tiv thaiv tooj liab oxidation, cais cov soldered thiab non-soldered qhov chaw ntawm PCB thaum lub sij hawm soldering, thiab los tiv thaiv lub nto ntawm PCB, engineers invented ib tug tshwj xeeb txheej. Cov xim zoo li no tuaj yeem yooj yim siv rau saum npoo ntawm PCB los tsim cov txheej txheem tiv thaiv nrog qee qhov tuab thiab thaiv kev sib cuag ntawm tooj liab thiab huab cua. Cov txheej txheej no yog hu ua solder mask, thiab cov khoom siv yog solder mask.

Txij li thaum nws yog hu ua lacquer, nws yuav tsum muaj xim sib txawv. Yog lawm, daim npog ntsej muag qub tuaj yeem ua tsis muaj xim thiab pob tshab, tab sis kom yooj yim ntawm kev saib xyuas thiab tsim khoom, PCBs feem ntau yuav tsum tau luam tawm nrog cov ntawv me me ntawm lub rooj tsavxwm.

Lub npog ntsej muag pob tshab tuaj yeem tsuas yog nthuav tawm cov xim PCB tom qab, yog li cov tsos tsis zoo txaus txawm tias nws yog tsim, kho lossis muag. Yog li ntawd, engineers ntxiv ntau xim rau lub ntsej muag solder los tsim ib tug dub, liab, los yog xiav PCB.

Cov PCB dub yog qhov nyuaj rau pom cov kab, uas ua rau muaj kev nyuaj rau kev saib xyuas

Los ntawm qhov kev pom no, cov xim ntawm PCB tsis muaj dab tsi ua rau qhov zoo ntawm PCB. Qhov sib txawv ntawm dub PCB thiab lwm yam xim PCBs xws li xiav PCB thiab daj PCB nyob rau hauv cov xim ntawm lub ntsej muag solder.

Yog tias PCB tsim thiab txheej txheem tsim khoom zoo ib yam, cov xim yuav tsis muaj kev cuam tshuam rau kev ua haujlwm, thiab nws yuav tsis muaj kev cuam tshuam rau cov cua sov dissipation.

Hais txog cov PCB dub, vim tias cov cim ntawm qhov chaw yuav luag tag, nws ua rau muaj kev nyuaj siab heev hauv kev saib xyuas tom qab, yog li nws yog xim tsis yooj yim rau kev tsim thiab siv.

Yog li ntawd, nyob rau hauv xyoo tas los no, tib neeg tau maj mam hloov kho, tso tseg kev siv lub npog ntsej muag dub, thiab siv cov xim ntsuab tsaus, xim av tsaus, xiav tsaus thiab lwm yam ntsej muag, lub hom phiaj yog los pab txhawb kev tsim thiab kho.

Tau hais tias, txhua tus tau nkag siab qhov teeb meem ntawm PCB xim. Hais txog "xim sawv cev lossis qis kawg" nqe lus, nws yog vim cov tuam txhab nyiam siv cov PCBs dub los ua cov khoom lag luam siab, thiab xim liab, xiav, ntsuab, thiab daj los ua cov khoom qis.

Cov ntsiab lus yog: cov khoom muab cov ntsiab lus xim, tsis yog xim muab cov ntsiab lus ntawm cov khoom.

Dab tsi yog cov txiaj ntsig ntawm kev siv cov hlau zoo li kub thiab nyiaj ntawm PCB?
Cov xim yog qhov tseeb, cia peb tham txog cov hlau tseem ceeb ntawm PCB! Thaum qee cov tuam ntxhab txhawb lawv cov khoom, lawv yuav hais tshwj xeeb tias lawv cov khoom siv cov txheej txheem tshwj xeeb xws li kub plating thiab nyiaj plating. Yog li dab tsi yog kev siv cov txheej txheem no?

PCB nto yuav tsum tau soldering Cheebtsam, yog li ib feem ntawm cov tooj liab txheej yuav tsum tau raug rau soldering. Cov khaubncaws sab nraud povtseg no yog hu ua pads. Cov ntaub qhwv feem ntau yog cov duab plaub lossis puag ncig nrog thaj tsam me me.

Hauv cov lus saum toj no, peb paub tias cov tooj liab siv hauv PCB tau yooj yim oxidized, yog li tom qab siv lub npog ntsej muag, cov tooj liab ntawm lub ncoo raug rau saum huab cua.

Yog hais tias cov tooj liab ntawm lub ncoo yog oxidized, nws yuav tsis tsuas yog nyuaj rau solder, tab sis kuj lub resistivity yuav zoo heev, uas yuav cuam tshuam rau kev ua tau zoo ntawm cov khoom kawg. Yog li ntawd, engineers tuaj nrog ntau txoj kev los tiv thaiv cov ntaub qhwv. Piv txwv li, plating nrog inert hlau kub, los yog npog lub nto nrog ib tug txheej ntawm cov nyiaj los ntawm ib tug txheej txheem tshuaj, los yog npog cov tooj liab txheej nrog ib tug tshwj xeeb chemical zaj duab xis los tiv thaiv kev sib cuag ntawm lub ncoo thiab huab cua.

Rau cov ntaub qhwv ntsej muag ntawm PCB, cov txheej tooj liab raug pom ncaj qha. Qhov no yuav tsum tau tiv thaiv kom tsis txhob oxidized.

Los ntawm qhov kev xav no, txawm tias nws yog kub lossis nyiaj, lub hom phiaj ntawm cov txheej txheem nws tus kheej yog los tiv thaiv oxidation, tiv thaiv lub ncoo, thiab xyuas kom meej cov txiaj ntsig ntawm cov txheej txheem tom ntej.

Txawm li cas los xij, kev siv cov hlau sib txawv yuav ua raws li cov cai ntawm lub sijhawm cia thiab kev cia khoom ntawm PCB siv hauv cov nroj tsuag ntau lawm. Yog li ntawd, PCB cov chaw tsim khoom feem ntau siv lub tshuab nqus tsev ntim cov tshuab ntim khoom rau pob PCBs tom qab PCB ntau lawm thiab ua ntej xa mus rau cov neeg siv khoom kom ntseeg tau tias PCBs tsis oxidized.

Ua ntej lub Cheebtsam yog welded ntawm lub tshuab, lub rooj tsavxwm daim ntawv chaw tsim tshuaj paus yuav tsum tau xyuas cov oxidation degree ntawm PCB, tshem tawm cov oxidation PCB, thiab xyuas kom meej cov yield. Lub rooj tsavxwm uas cov neeg siv khoom kawg tau txais tau dhau ntau yam kev sim. Txawm tias tom qab siv mus ntev, oxidation yuav luag tsuas yog tshwm sim ntawm qhov txuas txuas, thiab nws yuav tsis cuam tshuam rau lub ncoo thiab cov khoom siv uas twb muaj lawm.

Txij li thaum qhov kev tiv thaiv ntawm cov nyiaj thiab kub yog qis dua, tom qab siv cov hlau tshwj xeeb xws li nyiaj thiab kub, puas yuav txo qhov kub ntawm PCB?

Peb paub tias qhov tseem ceeb uas cuam tshuam rau cov cua sov yog qhov tsis kam. Qhov kev tiv thaiv muaj feem xyuam rau cov khoom ntawm tus neeg xyuas pib nws tus kheej, qhov chaw hla ntu thiab qhov ntev ntawm tus neeg xyuas pib. Lub thickness ntawm cov khoom siv hlau nyob rau saum npoo ntawm lub ncoo yog qhov deb tsawg dua 0.01 hli. Yog tias lub ncoo ua tiav los ntawm OST (organic tiv thaiv zaj duab xis) txoj kev, yuav tsis muaj qhov tuab tuab heev. Qhov kev tawm tsam nthuav tawm los ntawm cov tuab me me no yuav luag sib npaug li 0, txawm tias tsis yooj yim sua kom suav, thiab tau kawg nws yuav tsis cuam tshuam rau lub sijhawm cua sov.