Hais txog kub, nyiaj thiab tooj liab hauv PCB boards
Printed Circuit Board (PCB) yog cov khoom siv hluav taws xob yooj yim uas tau siv dav hauv ntau yam khoom siv hluav taws xob thiab lwm yam khoom siv. PCB kuj tseem hu ua PWB (Printed Wire Board, printed circuit board). Nws tau siv ntau dua hauv Hong Kong, Tuam Tshoj thiab Nyij Pooj, tab sis tam sim no nws tsawg dua (qhov tseeb, muaj qhov sib txawv ntawm PCB thiab PWB).
Hauv Western lub teb chaws thiab cheeb tsam, nws feem ntau hu ua PCB. Nyob rau sab hnub tuaj, lub npe txawv nyob ntawm lub teb chaws thiab cheeb tsam. Piv txwv li, nyob rau hauv Suav teb av loj, nws yog tam sim no feem ntau hu ua luam Circuit Court board (yav tas los hu ua printed circuit board), thiab nyob rau hauv Taiwan, nws yog feem ntau hu ua PCB. Circuit boards yog hu ua hluav taws xob (circuit) substrates hauv Nyiv thiab substrates hauv Kauslim.
PCB yog lub cev txhawb nqa ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob sib txuas ntawm cov khoom siv hluav taws xob. Nws tsuas yog ua lub luag haujlwm ntawm kev txhawb nqa thiab kev sib tshuam. Tsuas yog saib ntawm qhov pom, txheej txheej ntawm lub rooj tsav xwm hauv Circuit Court feem ntau tuaj hauv peb xim: kub, nyiaj, thiab lub teeb liab. Muab faib los ntawm tus nqi: kub yog qhov kim tshaj plaws, ua raws li nyiaj, thiab lub teeb liab yog qhov pheej yig tshaj. Txawm li cas los xij, cov kab hluav taws xob hauv Circuit Board feem ntau yog tooj liab ntshiab, uas yog, liab qab tooj liab boards.
Nws tau hais tias muaj ntau cov hlau muaj txiaj ntsig ntawm PCB. Nws tau tshaj tawm tias qhov nruab nrab, txhua lub xov tooj smartphone muaj {{0}}.05g kub, 0.26g nyiaj, thiab 12.6g tooj liab. Cov ntsiab lus kub ntawm lub laptop yog 10 npaug ntawm lub xov tooj ntawm tes!
Vim li cas thiaj muaj cov hlau tseem ceeb ntawm PCB?
Raws li kev txhawb nqa rau cov khoom siv hluav taws xob, PCB xav tau cov khoom sib txuas ntawm nws qhov chaw, uas yuav tsum muaj ib feem ntawm cov txheej tooj liab kom raug rau kev sib tsoo. Cov khaubncaws sab nraud povtseg no yog hu ua pads. Cov ntaub qhwv feem ntau yog cov duab plaub lossis ncig nrog thaj tsam me me. Yog li ntawd, tom qab siv cov solder tiv thaiv, qhov tsuas yog qhov raug huab cua yog tooj liab ntawm lub ncoo.
Cov ntaub qhwv ntsej muag ntawm PCB muaj cov txheej tooj liab ncaj qha. Qhov no yuav tsum tau tiv thaiv los ntawm oxidation.
Cov tooj liab siv hauv PCB yog yooj yim oxidized. 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, cuam tshuam rau kev ua tau zoo ntawm cov khoom kawg. Yog li ntawd, lub ncoo yog plated nrog inert hlau kub, los yog nws nto yog them nrog ib tug txheej ntawm nyiaj los ntawm ib tug txheej txheem tshuaj, los yog cov tooj liab txheej yog them nrog ib tug tshwj xeeb chemical zaj duab xis los tiv thaiv lub ncoo los ntawm kev sib cuag huab cua. Tiv thaiv oxidation thiab tiv thaiv lub ncoo kom ntseeg tau tias muaj txiaj ntsig hauv cov txheej txheem vuam tom ntej.
Kub, nyiaj thiab tooj liab ntawm PCB
1. PCB tooj liab clad board
Copper-clad laminate yog ib lub phaj zoo li cov khoom uas ua los ntawm impregnating iav fiber ntau daim ntaub los yog lwm yam ntaub ntawv reinforcing nrog resin thiab npog ib los yog ob sab nrog tooj liab ntawv ci thiab kub nias.
Noj fiberglass daim ntaub-raws li tooj liab-clad laminate ua piv txwv, nws cov ntaub ntawv tseem ceeb yog tooj liab, fiberglass daim ntaub, thiab epoxy resin, accounting rau kwv yees li 32%, 29%, thiab 26% ntawm cov khoom nqi feem.
Copper clad laminate yog cov khoom siv tseem ceeb ntawm cov ntawv luam tawm hauv Circuit Court, thiab cov ntawv luam tawm Circuit Board yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob feem ntau kom ua tiav kev sib txuas hauv Circuit Court. Nrog rau kev txhim kho txuas ntxiv ntawm kev tshawb fawb thiab thev naus laus zis, hauv xyoo tas los no, qee qhov tshwj xeeb hluav taws xob tooj liab clad laminates tuaj yeem siv ncaj qha kev tsim khoom ntawm cov khoom siv hluav taws xob. Cov conductors siv nyob rau hauv cov ntawv luam tawm Circuit Court boards feem ntau yog ua los ntawm nyias cov ntawv ci zoo li cov tooj liab, uas yog tooj liab ntawv ci hauv qhov nqaim.
2. PCB immersed kub Circuit Court board
Yog tias kub thiab tooj liab nyob rau hauv kev sib cuag ncaj qha, yuav muaj kev cuam tshuam lub cev ntawm electron migration thiab diffusion (kev sib raug zoo ntawm qhov sib txawv), yog li ib txheej ntawm "nickel" yuav tsum tau electroplated ua ntej raws li txheej thaiv, thiab tom qab ntawd kub yog electroplated rau saum. ntawm nickel, yog li peb feem ntau hu ua Electroplated kub, nws lub npe tiag tiag yuav tsum hu ua "electroplated npib tsib xee kub".
Qhov sib txawv ntawm cov kub kub thiab mos kub yog cov muaj pes tsawg leeg ntawm txheej kawg ntawm kub uas yog plated. Thaum kub plating, koj tuaj yeem xaiv electroplat ntshiab kub lossis alloy. Vim hais tias lub hardness ntawm ntshiab kub yog mos, nws kuj hu ua "mos kub." . Vim tias "kub" tuaj yeem tsim cov hlau zoo nrog "txhuas", COB tshwj xeeb yuav tsum tau cov tuab ntawm cov txheej kub ntshiab no thaum ua cov hlau txhuas. Tsis tas li ntawd, yog tias koj xaiv electroplated kub-nickel alloy lossis kub-cobalt alloy, vim tias cov hlau yuav nyuaj dua li cov kub ntshiab, nws tseem hu ua "hard kub".
Cov txheej kub plating yog dav siv nyob rau hauv cov khoom pads, kub ntiv tes, connector shrapnel, thiab lwm yam ntawm Circuit Court boards. Lub rooj tsav xwm tseem ceeb ntawm cov xov tooj txawb hluav taws xob uas siv ntau tshaj plaws yog cov laug cam feem ntau yog kub plated, immersed kub boards. Computer motherboards, suab thiab me me digital circuit boards feem ntau tsis yog kub-plated boards.
Kub yog kub tiag. Txawm hais tias tsuas yog ib txheej nyias nyias, nws twb tso nyiaj rau ze li 10% ntawm tus nqi ntawm lub rooj tsavxwm. Kub yog siv los ua txheej txheej plating, thawj zaug los pab txhawb kev vuam, thiab thib ob los tiv thaiv corrosion. Txawm hais tias tus ntiv tes kub ntawm lub cim nco tau siv tau ntau xyoo, nws tseem ci ntsa iab li qub. Yog tias siv tooj liab, txhuas, lossis hlau, lawv yuav xeb sai sai rau hauv pawg khib nyiab. Tsis tas li ntawd, tus nqi ntawm cov phaj kub-plated yog siab thiab lub zog vuam tsis zoo. Vim tias cov txheej txheem electroless npib tsib xee plating, daim hlau dub yog qhov tshwm sim. Cov nickel txheej yuav oxidize lub sij hawm, thiab kev cia siab rau lub sij hawm ntev kuj yog ib qho teeb meem.
3. PCB immersed silver circuit board
Immersion silver yog pheej yig dua li immersion kub. Yog tias PCB muaj kev ua haujlwm zoo rau kev sib txuas thiab xav tau los txo cov nqi, cov nyiaj immersion yog qhov kev xaiv zoo. Tsis tas li ntawd, immersion silver muaj zoo flatness thiab kev sib cuag, yog li cov txheej txheem immersion nyiaj yuav tsum tau xaiv.
