Halogen nyob rau hauv polychlorinated bipheny

Yog tias koj nug cov neeg tsim qauv feem ntau cov ntsiab lus halogen hauv a PCB tau pom, nws tsis ntseeg lawv yuav qhia koj. Halogens feem ntau pom muaj nyob rau hauv brominated nplaim retardants (BFR), chlorinated solvents thiab polyvinyl chloride (PVC). Halogens pom meej tsis txaus ntshai hauv txhua daim ntawv lossis kev saib xyuas, thiab tsis muaj teeb meem kev noj qab haus huv nrog tuav cov kav dej PVC lossis haus dej kais dej. Yog tias koj yuav tsum hlawv lub raj ntawd thiab nqus cov roj chlorine tso tawm thaum cov yas tawg, qhov ntawd yuav yog ib zaj dab neeg sib txawv. Qhov no yog qhov teeb meem tseem ceeb ntawm halogens hauv electronics. Lawv tuaj yeem luam tawm thaum kawg ntawm PCB lub neej voj voog. Yog li, qhov twg raws nraim koj pom halogens hauv Circuit Court board?

Raws li koj paub, PVC tsis yog tsuas yog siv rau cov kav dej, tab sis kuj rau xaim hluav taws xob, thiab yog li ntawd tej zaum yuav yog qhov chaw ntawm halogens. Cov kuab tshuaj chlorinated tuaj yeem siv los ntxuav PCBS thaum tsim khoom. BFR yog siv rau PCB laminates los txo qhov kev pheej hmoo ntawm hluav taws kub. Tam sim no peb tau tshuaj xyuas qhov tseem ceeb ntawm halogens hauv Circuit, peb yuav ua dab tsi txog nws?

Halogen dawb PCB

Ib yam li RoHS tsis xav tau cov hlau lead, cov qauv tsis muaj halogen xav kom CM siv cov ntaub ntawv tshiab thiab cov txheej txheem tsim khoom. Ib yam li txhua tus qauv “tsis muaj halogen” tshwj xeeb txwv los ntawm ntau lub koom haum. IEC lub ntsiab lus ntawm halogens tsis muaj chlorine thiab bromine tsawg dua 900 PPM thiab tag nrho halogens tsawg dua 1500 PPM, thaum RoHS nws muaj nws cov kev txwv.

Tam sim no yog vim li cas hais tias “halogen-dawb”? Qhov no yog vim tias ua tau raws li cov qauv tsis tas yuav lav tias koj lub rooj tsavxwm tsis muaj halogen. Piv txwv li, IPC sau cov kev ntsuam xyuas rau kev kuaj xyuas halogens hauv PCBS, uas feem ntau kuaj pom ionic bonded halogens. Txawm li cas los xij, feem ntau ntawm cov halogens pom nyob rau hauv flux yog covalently khi, yog li qhov kev ntsuam xyuas tsis tuaj yeem ntes lawv. Qhov no txhais tau tias txhawm rau ua ib daim ntawv tsis muaj halogen tiag, koj yuav tsum mus dhau qhov xav tau tus qauv.

Yog tias koj tab tom nrhiav ib qhov chaw tshwj xeeb ntawm halogens, ib qho yog TBBPA, uas yog BFR feem ntau siv hauv laminates. Txhawm rau tshem tawm qhov pib no, koj yuav tsum tau hais kom tsis muaj cov laminates tsis muaj halogen, xws li cov phosphorus puag laminates. Koj cov flux thiab solder kuj tseem tuaj yeem qhia halogens rau hauv PCB, yog li koj tseem yuav tau tham nrog CM seb lwm txoj hauv kev yuav muaj nyob ntawd. Nws tuaj yeem mob siab rau siv cov ntaub ntawv tshiab thiab thev naus laus zis ntawm cov laug cam, tab sis tsis muaj cov kab hluav taws xob halogen muaj qee qhov zoo. Halogen-free PCBS feem ntau muaj kev ntseeg tau zoo thaum tshav kub kub dissipation, uas txhais tau hais tias lawv zoo dua haum rau cov txheej txheem kub uas yuav tsum tau muaj rau cov hlau lead-dawb circuits. Lawv kuj feem ntau muaj kev tso cai qis dua yog tias koj xav khaws lub teeb liab ncaj ncees.

Halogen-free board tsim

Qhov zoo ntawm cov laug cam tsis muaj halogen tuaj ntawm tus nqi ntawm kev nyuaj zuj zus tsis yog hauv kev tsim khoom nkaus xwb tab sis kuj hauv kev tsim qauv. Ib qho piv txwv zoo yog cov khoom siv tsis muaj halogen thiab fluxes. Ntau yam tsis muaj Halogen tuaj yeem qee zaum hloov pauv qhov sib piv rau qhov sib piv thiab ua rau khawb. Qhov no yog qhov uas cov solder sib koom ua ke rau hauv lub pob loj es tsis muab faib thoob plaws hauv kev sib koom tes. Ib txoj hauv kev los daws qhov teeb meem no yog txhawm rau txheeb xyuas lub ncoo zoo dua nrog zaj duab xis thaiv. Qhov no yuav ua rau kom cov tshuaj txhuam hniav thiab txo qhov tsis xws luag.

Ntau cov ntaub ntawv tshiab muaj lawv tus kheej tsim quirks, thiab tej zaum koj yuav tau hu rau lub chaw tsim tshuaj paus los yog ua ib co kev tshawb fawb ua ntej siv lawv. Cov laug cam tsis muaj Halogen tau nce, tab sis tsis txhais tau tias yog thoob ntiaj teb. Koj yuav tsum tham nrog koj CM saib seb lawv puas muaj peev xwm tsim PCBS los ntawm cov ntaub ntawv tsis muaj halogen.

Raws li lub sijhawm dhau mus, peb zoo li pom tias ntau thiab ntau cov ntaub ntawv uas peb siv txhua hnub ua rau muaj kev phom sij rau peb. Yog vim li cas cov koom haum xws li IEC tsim cov qauv halogen-dawb board. Nco ntsoov qhov twg halogens feem ntau pom (BFR, hnyav, thiab rwb thaiv tsev), yog li yog tias koj xav tau halogen-dawb, koj paub cov halogens los hloov. Cov qauv sib txawv tso cai rau ntau qhov sib txawv ntawm halogens, thiab qee hom halogens tuaj yeem kuaj lossis tsis pom. Koj yuav tsum tau ua kev tshawb fawb ua ntej kom nkag siab qhov chaw ntawm thaj chaw teeb meem ntawm PCB. Thaum koj paub cov khoom siv twg, nws yog qhov zoo tshaj los tshuaj xyuas nrog cov chaw tsim khoom thiab CM los txiav txim siab txoj hauv kev zoo tshaj plaws rau yav tom ntej. Tej zaum koj yuav tau kho qhov tsim lossis ua haujlwm nrog CM ntawm qee qhov kev tsim khoom los xyuas kom meej tias koj lub rooj tsavxwm ua tiav.