Kev Tsim PCB Zaus Siab thiab Sib Dhos: Cov Khoom Siv Tseem Ceeb
Cov laug cam luam tawm ntau zaus(PCBs) yog cov khoom tseem ceeb hauv ntau yam kev siv, suav nrog kev sib txuas lus, radar systems, kev sib txuas lus wireless, thiab kev ua cov ntaub ntawv ceev ceev. Kev ua tau zoo ntawm cov PCBs no yog cuam tshuam los ntawm cov ntaub ntawv xaiv rau lawv tsim thiab sib dhos. Tsab xov xwm no tshawb nrhiav cov ntaub ntawv tseem ceeb siv rau hauv Kev tsim thiab sib dhos PCB zaus siab, hais txog lawv cov yam ntxwv thiab qhov zoo.
- Cov Khoom Siv Tseem CeebCov khoom siv hauv paus yog lub hauv paus ntawm PCB zaus siab thiab ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab nws cov khoom hluav taws xob. Qee cov khoom siv hauv paus tseem ceeb siv hauv PCB zaus siab suav nrog:
- FR-4: Ib qho khoom siv fiberglass composite epoxy resin pheej yig thiab siv dav, FR-4 muab kev kho tshuab zoo thiabkev ruaj khov ntawm thermal.Txawm li cas los xij, nwsdielectric tas mus li(Dk) thiabqhov cuam tshuam ntawm kev tawg(Df) tej zaum yuav tsis zoo tshaj plaws rau cov ntawv thov zaus siab.
- Cov Khoom Siv RogersRogers muaj npe nrov rau nws cov khoom siv dielectric ua tau zoo, xws li RT / Duroid. Cov ntaub ntawv no muaj cov nqi dielectric tas mus li (Dk) thiab dissipation factor (Df) zoo heev, ua rau lawv zoo rau cov ntawv thov PCB zaus siab.
- Cov Khoom Siv TaconicTaconic muab ntau yam khoom siv dielectric ua tau zoo, xws li PEEK (Polyether Ether Ketone) thiab polyimide, muab kev ruaj khov thermal zoo heev thiab Df qis, ua rau lawv zoo rau cov voj voog siab.
- Cov Khoom Siv Hluav Taws XobKev xaiv cov khoom siv hluav taws xob yog qhov tseem ceeb hauv kev tsim PCB zaus siab vim lawv txiav txim siab qhov hluav taws xob, kev tiv thaiv, thiab kev ncaj ncees ntawm lub teeb liab. Qee cov khoom siv hluav taws xob feem ntau siv hauv PCB zaus siab suav nrog:
- Tooj Liab: Tooj Liab yog cov khoom siv hluav taws xob feem ntau siv vim nws cov hluav taws xob zoo heev thiabkev siv nyiaj tsim nyogTxawm li cas los xij, nws qhov kev tiv thaiv nce nrog zaus, yog li cov txheej tooj liab nyias dua yuav siv tau rau hauv cov ntawv thov zaus siab.
- Kub: Kub yog paub txog nws qhov kev coj ua zoo tshaj plaws thiab kev tiv thaiv qis, ua rau nws zoo rau cov PCBs siab. Nws kuj muab qhov zookev tiv thaiv xebthiab kev ruaj khov. Txawm li cas los xij, kub kim dua tooj liab, txwv nws txoj kev siv hauv cov ntawv thov uas tsis kim heev.
- Txhuas: Txhuas yog ib qho kev xaiv uas tsis tshua muaj rau cov PCBs uas muaj zaus siab tab sis tuaj yeem siv rau hauv cov ntawv thov tshwj xeeb uas qhov hnyav thiab tus nqi yog qhov txhawj xeeb tseem ceeb. Nws cov conductivity qis dua tooj liab thiab kub, uas yuav xav tau kev txiav txim siab ntxiv hauv kev tsim qauv.
- Cov Khoom Siv DielectricCov ntaub ntawv dielectric yog qhov tseem ceeb rau kev rwb thaiv cov kab hluav taws xob ntawm PCB thiab yog qhov tseem ceeb hauv kev txiav txim siab txog cov khoom hluav taws xob ntawm PCB. Qee cov ntaub ntawv dielectric saum toj kawg nkaus siv hauv cov PCBs siab muaj xws li:
- Huab Cua: Huab cua yog cov khoom siv dielectric uas muaj ntau tshaj plaws thiab muab kev ua haujlwm hluav taws xob zoo heev ntawm cov zaus siab. Txawm li cas los xij, nws qhov kev ruaj khov thermal yog txwv, thiab nws yuav tsis haum rau cov ntawv thov kub siab.
- Polyimide: Polyimide yog ib qhoCov khoom siv dielectric ua tau zoo heev nto moo rau nws qhov kev ruaj khov thermal zoo heev thiab Df tus nqi qis. Nws feem ntau siv rau hauv cov PCBs siab uas yuav tsum tau tiv taus qhov kub siab.
- Epoxy: Cov ntaub ntawv dielectric ua los ntawm epoxy muaj kev ruaj khov zoo rau kev kho tshuab thiab thermal. Lawv feem ntau siv rau hauv cov ntaub ntawv FR-4 thiab muab kev ua haujlwm hluav taws xob zoo txog li qee zaus.
Kev xaiv cov ntaub ntawv rau kev tsim thiab sib dhos PCB zaus siab yog qhov tseem ceeb rau kev ua tiav qhov zoo tshaj plaws. Cov ntaub ntawv tseem ceeb, cov ntaub ntawv conductive, thiab cov ntaub ntawv dielectric txhua tus ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab cov khoom hluav taws xob ntawm PCB, kev ncaj ncees ntawm lub teeb liab, thiab kev ntseeg tau. Cov neeg tsim qauv yuav tsum xaiv cov ntaub ntawv no kom zoo raws li cov kev xav tau tshwj xeeb kom ntseeg tau tias muaj kev ua tau zoo tshaj plaws thiab kev ua haujlwm. Thaum thev naus laus zis txuas ntxiv mus, cov ntaub ntawv tshiab thiab kev txhim kho hauv cov ntaub ntawv uas twb muaj lawm yuav txuas ntxiv tawm, ntxiv dag zog rau cov peev xwm ntawm cov PCB zaus siab.
